Publications in NVA | ResearchGate.
Professor Emeritus Henning Dypvik, Department of Geosciences, UiO are affiliated to the Centre for Space Sensors and Systems – CENSSS, ITS, University of Oslo, where he has his office.
Academic Interests
- Impact geology and sedimentology
- Shallow marine sedimentation with focus on fine-grained sedimentation in the Mesozoic of North Atlantic and Arctic basins
- Karoo to recent rift valley sedimentation in East Africa
Personal merits
- Member of the editorial board of Sedimentary Geology,
- Scientific advisory panel for drilling the Chesapeake Bay Crater,
- Geology and geophysics committee of Norwegian Petroleum Society,
- Coordinator of the Nordic Impact Research program (NIR).
Tags:
Geology,
Sedimentology,
Impact geology
Publications
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Casademont, Titus; Dypvik, Henning; Eide, Sigurd; Berger, Tor & Hamran, Svein-Erik
(2024).
Martian Ground Penetrating Radar: Toward Automated Diffraction Detection for Dielectric Permittivity.
IEEE Transactions on Geoscience and Remote Sensing.
ISSN 0196-2892.
62.
doi:
10.1109/TGRS.2024.3424948.
Full text in Research Archive
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Eide, Sigurd; Casademont, Titus; Shoemaker, Emileigh S.; Brovoll, Sverre; Berger, Tor & Dypvik, Henning
[Show all 7 contributors for this article]
(2024).
Assessing Radar Attenuation in RIMFAX Soundings at the Jezero Western Fan Front, Mars.
Geophysical Research Letters.
ISSN 0094-8276.
doi:
10.1029/2023GL106471.
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Estimates of radar attenuation in the shallow Martian subsurface are retrieved from RIMFAX soundings along the Perseverance rover traverse. Specifically, analyzed data is from the Hawksbill Gap area during the rover's first drives onto the Jezero Western Fan Front. The centroid frequency-shift method is employed to quantify attenuation in terms of the constant-Q approximation. Results are then compared with the amplitude decay method, which—in order to calculate attenuation—requires propagation velocities retrieved from radargram analysis. By verifying that results from two separate analyses are consistent, we ensure that quantified radar properties are well constrained. First estimate of constant-Q is 78.8 ± 11.6. For a subsurface propagation velocity of 0.113 m/ns, that equals an attenuation of −2.1 ± 0.4 dB/m at the RIMFAX 675 MHz center frequency. Results are consistent with dry sedimentary rocks, and are distinguishable from the magmatic lithologies on Jezero Crater Floor.
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Dypvik, Henning; Stokkebekk, Even; Nordeng, Eirik N.; Småkasin, Rikke Øya; Sørhus, Kathrine & Morton, Andrew C.
[Show all 7 contributors for this article]
(2023).
The Neoproterozoic Valdres Group-depositional conditions and stratigraphical developments in the Mellane and Grønsenn-knippa sections, Valdres, Southern Norway.
Norwegian Journal of Geology.
ISSN 2387-5844.
103(2),
p. 1–37.
doi:
10.17850/njg103-2-2.
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The youngest part of the Valdres Group of south-central Norway (mainly the Neoproterozoic Rundemellen unit, Tonian – Cryogenian?) has been sedimentologically and stratigraphically studied and sampled at the Skarvemellen and Rundemellen sections at Mellane (Øystre Slidre) and Grønsennknippa (Vestre Slidre). The goal was to shed light on the depositional conditions and possible stratigraphical correlations to time-equivalent formations in the better-known Hedmark Group to the east. It is hoped that this approach will also help establish an improved basis to understand the related metamorphic Valdres Group units to the west and north of the study area. Depositional environments have been interpreted from sedimentary field data and observations, supported by petrographical, geochemical and mineralogical analyses. Coarse clastic sedimentary rocks of braided stream/alluvial fan dominates the Valdres Group. The studied succession at Grønsennknippa starts with massive pebbly conglomerates with well-rounded clasts and interbedded sandstone units, unconformably overlying crystalline basement. This package is overlain by sandstones of various alluvial affinity, interrupted only by one conglomerate horizon and one diamictite unit. The latter is possibly correlative to the diamictite recognised in the Valdres Group at Mellane, and may represent a tillite correlatable to the Moelv Tillite (Marinoan glaciation). The Mellane section is more dominated by sandstones and subordinate conglomerates than those at Grønsennknippa. Mineralogical composition and field observations of the Grønsennknippa and Mellane sections indicate relatively short transport distances of the texturally immature sediments. The petrography also reflects a later metamorphic phase (varying greenschist facies), overprinting the original mineralogy. Comparison between the Valdres Group at Mellane and Grønsennknippa sections indicates that the Grønsennknippa succession exhibits an originally more immature mineralogical and textural signature than those at Mellane. The Grønsennknippa sections are more feldspar-rich and dominated by coarse-grained detritus. This may reflect different positions with respect to the source area/basin margin. In this study, the Valdres Group at Grønsennknippa and Mellane is compared with selected fluvial/alluvial formations of the Hedmark Basin, revealing comparable depositional environments and stratigraphic developments. The occurences of possible tillites at stratigraphical levels comparable to the Moelv Tillite are of particular interest. The petrographical composition and heavy mineral distribution support comparable sediment sources from mainly Sveconorwegian formations in both Valdres and Hedmark basins.
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Casademont, Titus; Eide, Sigurd; Shoemaker, E.S.; Liu, Y.; Nunes, D.C. & Russell, P.
[Show all 10 contributors for this article]
(2023).
RIMFAX Ground Penetrating Radar Reveals Dielectric Permittivity and Rock Density of Shallow Martian Subsurface.
Journal of Geophysical Research (JGR): Planets.
ISSN 2169-9097.
doi:
10.1029/2022JE007598.
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The Mars 2020 Perseverance Rover is equipped with the RIMFAX ground penetrating radar
instrument which has been continuously surveying the shallow subsurface during the rover's journey. Within the
first 379 mission days, we identify hyperbolic patterns in the data, which are thought to be caused by objects
such as buried boulders or cavities located in the upper 5 m of the subsurface. To obtain the first detailed
estimates of radar wave propagation velocity, we match these scatterer-generated patterns with theoretical
traveltime hyperbolas, which take into account the refraction at the surface. We employ these estimates to
derive the average dielectric permittivity and bulk rock density of the volume above the scatterer source. The
parameters compare well with those obtained through orbital radar measurements and those measured by other
instruments onboard the Perseverance Rover. Our findings are consistent with a subsurface dominated by solid
rock and mafic material.
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Eide, Sigurd; Casademont, Titus; Berger, Tor; Dypvik, Henning; Hamran, Svein-Erik & Shoemaker, Emileigh S.
(2023).
Radar Attenuation in the Shallow Martian Subsurface: RIMFAX Time-Frequency Analysis and Constant-Q Characterization Over Jezero Crater Floor.
Geophysical Research Letters.
ISSN 0094-8276.
50(23).
doi:
10.1029/2022GL101429.
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Attenuation of radar waves in the subsurface can be quantified with a constant-Q approximation through time-frequency analysis. We implement the centroid frequency-shift method and study Radar Imager for Mars' Subsurface Exploration (RIMFAX) data acquired along the Mars 2020 Perseverance rover traverse. Attenuation is among key media properties, but quantified estimates need to account for instrument characteristics and limitations in the analysis technique. We ensure accurate constant-Q characterization and present the first estimates of radar attenuation in the upper 5 m of the shallow Martian subsurface. Over Jezero Crater Floor, constant-Q is on average 70.4 ± 7.7, which equals an attenuation of −2.6 ± 0.3 dB/m at RIMFAX’ 675 MHz center frequency. Regions comprising the Máaz or Séítah formations have similar attenuation properties that are consistent with magmatic lithologies.
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Bruhn, Rikke; Nagy, Jenø; Smelror, Morten; Dypvik, Henning; Glimsdal, Sylfest & Pegrum, Richard
[Show all 7 contributors for this article]
(2022).
Shaking and splashing—A case study of far-field effects of the Mjølnir asteroid impact on depositional environments in the Barents Sea.
Basin Research.
ISSN 0950-091X.
doi:
10.1111/bre.12725.
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The Mjølnir impact crater in the Norwegian Barents Sea features among the 20 largest impact craters listed in the Earth Impact Database. The impact is dated to 142 ± 2.6 Ma, corresponding closely to the Jurassic/Cretaceous boundary in the Boreal stratigraphy. Multidisciplinary studies carried out over the last three decades have suggested that the up to 40 km wide crater was created by a 1–3 km diameter impactor colliding with a shallow epicontinental sea, causing regional havoc and a regional ecological crisis that followed in its wake. Only minor evidence for the consequences of the impact for the surrounding depositional basins has been documented so far. This study describes a large submarine slump penetrated by hydrocarbon exploration well 7121/9-1, located in the southern Hammerfest Basin and approximately 350 km away from the impact site. The slump is dated by a black shale drape, which contains characteristic impact-related biotic assemblages and potential ejecta material. This precise dating enables us to associate the slump with large-scale fault movements and footwall collapse along the basin-bounding Troms-Finnmark Fault Complex, which we conclude were caused by shock waves from the Mjølnir impact and the passage of associated tsunami trains. The draping black shale is interpreted to represent significant reworking of material from the contemporary seabed by tsunamis and currents set up by the impact.
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Riber, Lars; Pera, Emilia Le; Morrone, Consuele; Ietto, Fabio; Conforti, Massimo & Dypvik, Henning
(2022).
Pore system evolution in arenaceous regoliths - Case study from the Sila Massif (southern Italy).
Marine and Petroleum Geology.
ISSN 0264-8172.
143.
doi:
10.1016/j.marpetgeo.2022.105781.
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Porous and permeable crystalline rocks have the potential of being hydrocarbon reservoirs. In many cases, reservoir properties are created by rock-altering physico-chemical processes occurring in the near-surface environment. Hydrocarbon reservoirs in altered granitoids may comprise both arenaceous (clay-poor) and argillaceous (clay-rich) palaeoregoliths, and hence outcrop analogues from various environments are required. In the Sila Massif, southern Italy, the arenaceous weathering of medium to coarse grained granodioritic rocks has been studied. The pore system, dominated by microfractures, was described and quantified at each stage in the weathering process (altered coherent rock facies → saprock facies→ lower and upper saprolite facies → soil) in relation to changes in chemical and physical properties. The transformation of rock to saprolite was close to an isochemical process, as demonstrated by the low variations in the bulk mass transfer coefficient (τbulk). At the same time, trans-, intra- and intermineral microfractures increased in frequency and aperture upwards through the regolith profile. It was the main reason for the reduction of bulk densities (ρb) from 2.66 g/cm3 in the altered coherent rock to 1.88 g/cm3 in the saprolite, corresponding to the formation of up to 30% porosity (φc). The results suggest that a volume increase of >50%, represented by the volumetric strain factor (ε), was the main cause for the transformation of solid crystalline rock to porous saprolite. Anisovolumetric arenaceous regoliths with minimal mass loss, are the result of one of the major weathering processes, notwithstanding that they are much less understood than isovolumetric, anisochemical, argillaceous regoliths. Arenaceous saprolites potentially can have excellent porosity and permeability properties, with open and well-connected microfractures. Reservoir quality of arenaceous saprolites is in stark contrast to the poor permeability observed in some argillaceous saprolites where porosity is dominated by isolated dissolution voids within a clay-rich matrix.
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Eide, Sigurd; Hamran, Svein-Erik; Dypvik, Henning & Amundsen, Hans E. F.
(2021).
Ground-Penetrating Radar Modeling across the Jezero Crater Floor.
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing.
ISSN 1939-1404.
14,
p. 2484–2493.
doi:
10.1109/JSTARS.2021.3055944.
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This article assesses how the ground-penetrating radar RIMFAX will image the crater floor at the Mars 2020 landing site, where lithological compositions and stratigraphic relationships are under discussion prior to mission operation. A putative mafic unit (lava flow, volcanic ash, or volcaniclastic deposit) on the crater floor will be crucial in piecing together the chronology of deposition and for understanding the volcanic history in the region. In order to see how lithological properties and subsurface geometries affect radar sounding, a synthetic radargram is generated through forward modeling with a finite-difference time-domain method. The acquisition is simulated across the mafic unit as a succession of lava flows, exploring detection of internal structures and contacts to adjacent lithologies. To compare modeling results with the alternative formation scenarios, a discussion about sounding over a tephra or volcaniclastic material is presented. Similarities and differences between Martian and terrestrial lithologies can be related to electromagnetic properties relevant for radar sounding. This article, therefore, evaluates potential scientific insights gained from acquisition across the disputed mafic unit, in light of proposed hypotheses of lithological generation.
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Sætre, Christian; Hellevang, Helge; Dennehy, C. & Dypvik, Henning
(2021).
Reactive transport modelling of an intra-basalt sandstone reservoir, Rosebank, UK.
Scientific Reports.
11(1).
doi:
10.1038/s41598-021-86421-w.
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Abstract The Rosebank field, located in the Faroe-Shetland Basin, contains producible hydrocarbons in intra-basaltic siliciclastic reservoirs. The volcanic-reservoir interface is poorly studied and the geochemical system, as a function of distance from the basalt, is largely unknown. The current paper applies a geochemical model coupling mineral dissolution and precipitation with element diffusion to investigate the geochemical system in time and space from the basalt-sandstone interface. Earlier studies indicate few negative effects on reservoir properties despite the proximity to a reactive volcanic lithology. The causes of this minimal impact have not been studied. The numerical simulations in this study expand on the knowledge demonstrating that precipitation of authigenic phases at the basalt-sandstone interface buffer the formation water solution for key elements, which hamper the transport of solutes and subsequent precipitation of secondary minerals within the reservoir. Saturation index values over the simulated period indicate that precipitation of authigenic phases should not extend beyond the basalt-sandstone interface. This shows that diffusion alone is not enough to reduce the reservoir quality due to increased precipitation of secondary phases. The basalt dissolution rate varies according to the silica concentration. The combined effects on silica concentration by diffusional fluxes, mineral precipitation and dissolution, control the basalt dissolution rate, and there are no differences in the results between high and low basalt reactive surface area.
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Dypvik, Henning; Hellevang, Helge; Krzesinska, Agata Magdalena; Sætre, Christian; Viennet, Jean-Christophe & Bultel, Benjamin Gabriel Rene
[Show all 13 contributors for this article]
(2021).
The Planetary Terrestrial Analogues Library (PTAL) – An exclusive lithological selection of possible martian earth analogues.
Planetary and Space Science.
ISSN 0032-0633.
208.
doi:
10.1016/j.pss.2021.105339.
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The Planetary Terrestrial Analogues Library (PTAL) is a dedicated lithological collection that currently consists of 102 terrestrial rock samples selected to be possible Mars analogues. The ultimate goal is improving future remote mineralogical and petrological analysis on Mars and other planetary bodies based on selected analysis such as Near- Infrared Reflectance Spectroscopy (NIR), Raman spectroscopy, Laser Induced Breakdown Spectroscopy (LIBS) and X-ray diffraction (XRD). Most international standards applied in the remote martian mineralogical and petrological analysis have so far been based on single, pure mineral analysis, with minimal interferences from other naturally occurring minerals. Here we present detailed lithological sample evaluations based on field appearance along with optical and XRD analysis of key terrestrial rock types. The detailed mineralogical and petrological descriptions give good basis for more complete lithological understanding. In combination with NIR, LIBS and Raman analysis of the very same samples PTAL aims at improving mineralogical and petrographical information from future rovers on Mars e.g. NASA's Mars2020-Perseverance and ESA and Roscosmos's ExoMars - Rosalind Franklin. The PTAL sample collection covers exclusively collected volcanic, magmatic and various sedimentary rocks and regoliths from well-known locations all over the world. These samples have a general composition comparable to what is currently known from Mars. The strength of this sample collection is its origin as common whole rock samples, in which minerals occur in their natural settings. It thereby allows studying possible detection interferences and a comparison of the sensitivity of the different techniques. The collection, in addition, forms the base for various alteration studies to better understand and explain alteration and weathering conditions on Mars. The complete results and sample preparations will be available to all scientists interested.
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Lantz, Cateline; Poulet, Francois; Loizeau, Damien; Riu, Lucie; Pilorget, C. & Carter, John
[Show all 9 contributors for this article]
(2020).
Planetary Terrestrial Analogues Library project: 1. characterization of samples by near-infrared point spectrometer.
Planetary and Space Science.
ISSN 0032-0633.
189.
doi:
10.1016/j.pss.2020.104989.
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The PTAL project aims at building and exploiting a database involving several analytical techniques, the Planetary Terrestrial Analogues Library, to help characterizing the mineralogical evolution of terrestrial bodies, starting with Mars. A total of 94 natural Earth rocks have been collected from selected locations around the world to get a selection of analogues for Martian geology. The PTAL library gathers a variety of igneous rocks from different plutonic and volcanic origins and compositions, associated to different environments and levels of aqueous alteration. Samples of impact craters and sedimentary units are also present. The full set of samples will be characterized with optical thin section analysis and XRD (Oslo University, Norway), NIR spectroscopy (Paris-Saclay University, France), Raman spectroscopy (Valladolid University, Spain) and LIBS (Paul Sabatier University, France). The multianalytical study used within the PTAL project provides an unique opportunity to coordinate minerals/elements detection by different techniques that are similar to the instruments onboard current and forthcoming Martian missions. Such combined analysis should give the opportunity to prepare and improve ExoMars/ESA-Roscosmos and Mars2020/NASA observations. This paper focuses only on the NIR measurements and interpretations. The diversity of the PTAL samples is well revealed by the diversity of spectra from the NIR observations. The detected minerals are representative of various formation, alteration and geochemical environments. The major diagnostic features observed are those of primary Fe2+ bearing silicates like olivine or pyroxene with low and/or high calcium content; altered silicates detected with vibrational features associated to OH and/or H2O and/or metal-OH features; oxides; zeolites; and carbonates. This collection brings together a set of rocks and minerals that have been reported elsewhere in the Solar System and particularly on Mars.
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Holmqvist, Anders; Alwmark, Carl; Dypvik, Henning & Nilsen, Odd
(2020).
The Lycksele Ring Structure - Still no Proof of an Impact Origin.
GFF.
ISSN 1103-5897.
142(2),
p. 96–99.
doi:
10.1080/11035897.2019.1701547.
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The origin of the more than 100 km wide Lycksele ring structure in Sweden has puzzled geoscientists for years. In this short note we present results from field analysis, detailed sampling and laboratory analysis executed in search for evidence of an impact, e.g. shatter cones and shock features in minerals. Both approaches gave negative results and consequently an impact origin could neither be confirmed nor rejected. The circular structure of the Lycksele ring and its central uplift are, however, typical features of large, complex impact structures.
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Fossum, Katrine; Dypvik, Henning; Haid, Muna Hassan Mohamoud; Hudson, Wellington & Brink, Majkel van den
(2020).
Late Jurassic and Early Cretaceous sedimentation in the Mandawa Basin, coastal Tanzania.
Journal of African Earth Sciences.
ISSN 1464-343X.
174.
doi:
10.1016/j.jafrearsci.2020.104013.
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This paper concerns the sedimentary successions deposited in the Mandawa Basin after the separation of East and West Gondwana during the subsequent southwards drift of Madagascar in the Late Jurassic to Early Cretaceous times. The aim of this study was to provide more specific details on the Late Jurassic and Early Cretaceous sedimentation and to report mineralogical and petrographical characteristics on the less well documented successions, namely the Kipatimu, Mitole and Nalwehe formations, in the central and northern parts of the Mandawa Basin. The Late Jurassic and Early Cretaceous depositional environments are reviewed, based on the sedimentological, mineralogical and petrographical results presented here, supplemented by previously published work. The Late Jurassic to Early Cretaceous depositional setting mainly reflects a shallow, tidally influenced, mixed carbonate-silisiclastic coastal ramp. The succession displays cyclical sedimentation best described as a series of transgressive-regressive sequences with limestones overlain by siliciclastics. During transgressions microbial activity was high and sedimentation rates low, resulting in micro-oncoid deposition in the late Kimmeridgian – early Tithonian (Mitole Limestone Member), and oncoids and stromatolites in the Early Cretaceous (Nalwehe Limestone Member). During the regressive phases siliciclastic marginal marine sediments were deposited over the limestones. The regressive sandstones are mainly unfossiliferous and display evidence of being deposited in a tide-dominated, marginal marine environment.
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Fossum, Katrine; Dypvik, Henning & Morton, Andrew
(2020).
Provenance studies of southern Tanzania river sediments: Heavy mineral signatures and U–Pb zircon ages.
Journal of African Earth Sciences.
ISSN 1464-343X.
170.
doi:
10.1016/j.jafrearsci.2020.103900.
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Detrital zircon U–Pb geochronology and heavy mineral data from four main rivers in coastal southern Tanzania - the Rufiji, Matandu, Mbwemkuru and Ruvuma rivers - are compared with the bedrock geology of their catchment and with data from the Mesozoic strata of the Mandawa Basin, also in coastal Tanzania. The objective is to evaluate the source-to-sink pattern of sedimentation through time, between the Mesozoic and present day. The recent river sediments display variations in both heavy mineral assemblages and U–Pb zircon populations, reflecting their different catchment areas. The Matandu and Mbwemkuru rivers transport sediments characterised by amphibole-dominated heavy mineral assemblages, whereas the great Rufiji and Ruvuma rivers are characterised by more stable heavy mineral assemblages. The detrital zircon populations show age peaks at c. 2900–2500, 2000–1800, 1000, 800 and 700–500 Ma, the common denominators are the Late Mesoproterozoic (c. 1000 Ma) and Late Neoproterozoic (700–500 Ma) age fractions. The Rufiji River and the Matandu River display similar zircon age distributions, both containing abundant Palaeoproterozoic zircons, interpreted as recycled from Karoo successions in a part of the Selous Basin which is drained by both rivers. The Mbwemkuru and Ruvuma rivers contain mainly Late Mesoproterozoic and Late Neoproterozoic aged zircons that were supplied from the Unango and Marrupa complexes and the Cabo Delgado Nappe Complex/Eastern Granulites. The more diverse zircon population in the Rufiji and Matandu river is likely reflects recycling of older sedimentary successions in addition to sediments supplied from basement lithologies.
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Hamran, Svein-Erik; Paige, David A.; Amundsen, Hans E. Foss; Berger, Tor; Brovoll, Sverre & Carter, Lynn
[Show all 19 contributors for this article]
(2020).
Radar imager for Mars’ subsurface experiment—RIMFAX.
Space Science Reviews.
ISSN 0038-6308.
doi:
10.1007/s11214-020-00740-4.
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The Radar Imager for Mars’ Subsurface Experiment (RIMFAX) is a Ground Penetrating Radar on the Mars 2020 mission’s Perseverance rover, which is planned to land near a deltaic landform in Jezero crater. RIMFAX will add a new dimension to rover investigations of Mars by providing the capability to image the shallow subsurface beneath the rover. The principal goals of the RIMFAX investigation are to image subsurface structure, and to provide information regarding subsurface composition. Data provided by RIMFAX will aid Perseverance’s mission to explore the ancient habitability of its field area and to select a set of promising geologic samples for analysis, caching, and eventual return to Earth. RIMFAX is a Frequency Modulated Continuous Wave (FMCW) radar, which transmits a signal swept through a range of frequencies, rather than a single wide-band pulse. The operating frequency range of 150–1200 MHz covers the typical frequencies of GPR used in geology. In general, the full bandwidth (with effective center frequency of 675 MHz) will be used for shallow imaging down to several meters, and a reduced bandwidth of the lower frequencies (center frequency 375 MHz) will be used for imaging deeper structures. The majority of data will be collected at regular distance intervals whenever the rover is driving, in each of the deep, shallow, and surface modes. Stationary measurements with extended integration times will improve depth range and SNR at select locations. The RIMFAX instrument consists of an electronic unit housed inside the rover body and an antenna mounted externally at the rear of the rover. Several instrument prototypes have been field tested in different geological settings, including glaciers, permafrost sediments, bioherme mound structures in limestone, and sedimentary features in sand dunes. Numerical modelling has provided a first assessment of RIMFAX’s imaging potential using parameters simulated for the Jezero crater landing site.
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Sætre, Christian; Hellevang, Helge; Riu, Lucie; Dypvik, Henning; Pilorget, C & Poulet, Francois
[Show all 7 contributors for this article]
(2019).
Experimental hydrothermal alteration of basaltic glass with relevance to Mars.
Meteoritics and Planetary Science.
ISSN 1086-9379.
54(2),
p. 357–378.
doi:
10.1111/maps.13214.
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Phyllosilicates, carbonates, zeolites, and sulfates on Mars give clues about the planet's past environmental conditions, but little is known about the specific conditions in which these minerals formed within the crust and at the surface. The aim of the present study was to gain increased understanding on the formation of secondary phases by hydrothermal alteration of basaltic glass. The reaction processes were studied under varying conditions (temperature, pCO2, water:rock ratio, and fluid composition) with relevance to aqueous hydrothermal alteration in fully and partly saturated Martian basalt deposits. Analyses made on reaction products using X-ray diffraction (XRD) and scanning electron microscope (SEM) were compared with near infrared spectroscopy (NIR) to establish relative detectability and spectral signatures. This study demonstrates that comparable alteration minerals (phyllosilicates, carbonates, zeolites) form from vapor condensing on mineral surfaces in unsaturated sediments and not only in fully water-saturated sediments. In certain environments where water vapor might be present, it can alter the basaltic bedrock to a suite of authigenic phases similar to those observed on the Martian surface. For the detection of the secondary phases, XRD and SEM-EDS were found to be superior to NIR for detecting and characterizing zeolites. The discrepancy in detectability of zeolites between NIR and XRD/SEM-EDS might indicate that zeolites on Mars are more abundant than previously thought.
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Stokkebekk, Even; Nordeng, Eirik N.; Dypvik, Henning; Småkasin, Rikke Øya; Sørhus, Kathrine & Kürschner, Wolfram Michael
(2019).
Sedimentological and palynological investigations of the Neoproterozoic Valdres Group.
Norwegian Journal of Geology.
ISSN 2387-5844.
99(4),
p. 575–582.
doi:
10.17850/njg99-4-2.
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The Valdres Group (?Cryogenian) has been sedimentologically and stratigraphically studied and sampled in a few key sites (Grønsennknippa, Mellane, Ormtjernkampen). The search for fossils in selected formations has been the target and one identified acantomorphic acritarch was discovered along with other organic matter of more uncertain heritage. In addition to the diamictite/tillite present in the Valdres Group succession, this facilitates a correlation with the well-known Hedmark Group to the east.
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Riber, Lars; Driese, Steven G; Stinchcomb, Gary E; Dypvik, Henning & Sørlie, Ronald
(2019).
Reconstructing a high paleolatitude Mesozoic paleoenvironment from a truncated and deeply buried regolith, Norwegian North Sea.
Palaeogeography, Palaeoclimatology, Palaeoecology.
ISSN 0031-0182.
528,
p. 60–77.
doi:
10.1016/j.palaeo.2019.04.031.
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Abay, Tesfamariam Berhane; Fossum, Katrine; Karlsen, Dag Arild; Dypvik, Henning; Narvhus, Lars J Jørgensen & Haid, Muna Hassan Mohamoud
[Show all 7 contributors for this article]
(2019).
Petroleum geochemical aspects of the Mandawa Basin, coastal Tanzania: The origin of migrated oil occurring today as partly biodegraded bitumen.
Petroleum Geoscience.
ISSN 1354-0793.
doi:
10.1144/petgeo2019-050.
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The shallow marine Upper Jurassic to Lower Cretaceous sedimentary successions of the Mandawa Basin, coastal Tanzania, are located about 80 km away from the offshore gas discoveries of Block 2, Tanzania. In this paper we present petroleum geochemical data, including bitumen extracted from outcrop samples which are relevant to the understanding of the onshore “Petroleum System” and possibly also to the offshore basin. Despite some biodegradation and weathering, common to all outcrop samples, most bitumen samples analyzed contain mature, migrated oil. The maturity span of geomarkers (C13-C15 range) covers the entire oil and condensate/wet gas window (Rc = 0.7–2% Rc), with the biomarkers generally indicating the oil window (Rc = 0.7–1.3% Rc). This suggests that the bitumen extracts represent several phases of migrated oil and condensate, which shows that the samples are part of an active or recently active migration regime or “Petroleum System”. The source rock facies inferred for the bitumen is Type II/III kerogen of siliciclastic to carbonate facies. This is oil-prone kerogen, typical for a marine depositional system with influx of proximal derived terrigenous material blended in with in situ marine algal organic matter (OM). Application of age specific biomarkers such as the C28/C29 steranes, extended tricyclic terpane ratio (ETR), nordiacholestanes and the aromatic steroids suggest that more than one source rock have contributed to the bitumen. Possible ages are limited to the Mesozoic i.e. excluding the Late Paleozoic, with the most likely source rock belonging to the Early Jurassic. More geochemical and geological studies should be undertaken to further develop the general understanding of the petroleum system of the Mandawa Basin and its implications to the “Petroleum Systems” both offshore and onshore. This paper also presents a reinterpretation of published gas composition and isotope data on the Pande, Temane and Inhassoro gas fields (Mozambique) with implications for possible oil discoveries in the gas dominated region.
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Markussen, Ørjan; Dypvik, Henning; Hammer, Erik; Long-Sanouiller, Haili & Hammer, Øyvind
(2019).
3D characterization of porosity and authigenic cementation in Triassic conglomerates/arenites in the Edvard Grieg Field using 3D micro-CT imaging.
Marine and Petroleum Geology.
ISSN 0264-8172.
99,
p. 265–281.
doi:
10.1016/j.marpetgeo.2018.10.015.
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Fossum, Katrine; Morton, Andrew; Dypvik, Henning & Hudson, Wellington
(2018).
Integratedheavy mineral study of Jurassic to Paleogene sandstones in the Mandawa Basin, Tanzania: Sediment provenance and source-to-sink relations.
Journal of African Earth Sciences.
ISSN 1464-343X.
150,
p. 546–565.
doi:
10.1016/j.jafrearsci.2018.09.009.
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Mahmic, Orhan; Dypvik, Henning & Hammer, Erik
(2018).
Diagenetic influence on reservoir quality evolution, examples from Triassic conglomerates/arenites in the Edvard Grieg field, Norwegian North Sea.
Marine and Petroleum Geology.
ISSN 0264-8172.
93,
p. 247–271.
doi:
10.1016/j.marpetgeo.2018.03.006.
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Temraz, Mostafa & Dypvik, Henning
(2018).
The Lower Miocene Nukhul Formation (Gulf of Suez, Egypt): microfacies and reservoir characteristics.
Journal of Petroleum Exploration and Production Technology.
ISSN 2190-0558.
8(1),
p. 85–98.
doi:
10.1007/s13202-017-0386-3.
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The Lower Miocene Nukhul Formation was deposited early during early stages of Gulf of Suez rifting. Outcrop of this Formation at Gebel el Zeit, Egypt is up to 100 m (328 ft) thick and consist of lower sandstone-dominated and upper carbonate-dominated units. Samples were collected from the Nukhul Formation outcrop to describe the lithofacies, mineralogy, and petrographic characteristics to better understand the hydrocarbon reservoir potential for the unit. The investigations showed that the lower part of Nukhul Formation at North Gebel el Zeit consists of poorly sorted, dolomitic sandstone and sandy dolomite which were deposited in a shallow-marine setting. The presence of polycrystalline and crushed quartz grains in Nukhul strata indicates that these strata were sourced by recycled sediments associated with local uplift tied to rifting. The upper Nukhul consists of dolomitized carbonates with preservation of primary textures; primary limestone depositional textures include the following: intraclast packstone, rudstone, and coral-algal boundstone, wackestone, and grainstone with minor floatstone. Carbonate rock strata were deposited in shallow marine, peritidal to subtidal environments that developed on fault-block highs. The presence of zoned saddle dolomite suggests some component of fault-controlled fluid flow. The reservoir characteristic of the Lower Miocene Nukhul Formation at the Gebel el Zeit indicates favorable properties for reservoir development in both the lower siliciclastic-dominated dolomite and the upper dolomitized carbonate portions of the formation.
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Dypvik, Henning; Gohn, Gregory; Edwards, Lucy E.; Wright, Horton; Powars, David S. & Ronald, Litwin
(2018).
Chesapeake Bay Impact Structure-Development of "Brim" sedimentation in a Multilayered Marine Target.
Geological Society of America, Special Paper.
ISSN 0072-1077.
537.
doi:
10.1130/2018.2537.
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The late Eocene Chesapeake Bay impact structure was formed in a multilayered target of seawater underlain sequentially by a sediment layer and a rock layer in a continental-shelf environment. Impact effects in the “brim” (annular trough) surrounding and adjacent to the transient crater, between the transient crater rim and the outer margin, primarily were limited to the target-sediment layer. Analysis of published and new lithostratigraphic, biostratigraphic, sedimentologic, petrologic, and mineralogic studies of three core holes, and published studies of a fourth core hole, provided information for the interpretation of the impact processes, their interactions and relative timing, their resulting products, and sedimentation in the brim. Most studies of marine impact-crater materials have focused on those found in the central crater. There are relatively few large, complex marine craters, of which most display a wide brim around the central crater. However, most have been studied using minimal data sets. The large number of core holes and seismic profiles available for study of the Chesapeake Bay impact structure presents a special opportunity for research. The physical and chronologic records supplied by study of the sediment and rock cores of the Chesapeake Bay impact indicate that the effects of the initial, short-lived contact and compression and excavation stages of the impact event primarily were limited to the transient crater. Only secondary effects of these processes are evident in the brim. The preserved record of the brim was created primarily in the subsequent modification stage. In the brim, the records of early impact processes (e.g., outgoing tsunamis, overturned flap collapse) were modified or removed by later processes. Transported and rotated, large and small clasts of target sediments, and intervals of fluidized sands indicate that seismic shaking fractured and partially fluidized the Cretaceous and Paleogene target sediments, which led to their inward transport by collapse and lateral spreading toward the transient crater. The succeeding inward seawater-resurge flow quickly overtook and interacted with the lateral spreading, further facilitating sediment transport across the brim and into the transient crater. Variations in the cohesion and relative depth of the target sediments controlled their degree of disaggregation and redistribution during these events. Melt clasts and shocked and unshocked rock clasts in the resurge sediments indicate fallout from the ejecta curtain and plume. Basal parautochthonous remnant sections of target Cretaceous sediments in the brim thin toward the collapsed transient crater. Overlying seawater-resurge deposits consist primarily of diamictons that vary laterally in thickness, and vertically and laterally in maximum grain size. After cessation of resurge flow and re-establishment of pre-impact sea level, sandy sediment gravity flows moved from the margin to the center of the partially filled impact structure (shelf basin). The uppermost unit consists of stratified sediments deposited from suspension. Postimpact clayey silts cap the crater fill and record the return to shelf sedimentation at atypically large paleodepths within the shelf basin. An unresolved question involves a section of gravel and sand that overlies Neoproterozoic granite in the inner part of the brim in one core hole. This section may represent previously unrecognized, now parautochthonous Cretaceous sediments lying nonconformably above basement granite, or it may represent target sediments that were moved significant distances by lateral spreading above basement rocks or above a granite megaclast from the overturned flap. The Chesapeake Bay impact structure is perhaps the best documented example of the small group of multilayer, marine-target impacts formed in continental shelves or beneath epeiric seas. The restriction of most impact effects to the target-sediment layer in the area outside the transient cavity, herein called the brim, and the presence of seawater-resurge sediments are characteristic features of this group. Other examples include the Montagnais (offshore Nova Scotia, Canada) and Mjølnir (offshore Norway) impact structures.
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Sætre, Christian; Hellevang, Helge; Dennehy, Cleona; Dypvik, Henning & Clark, Samantha
(2018).
A diagenetic study of intrabasaltic siliciclastics sandstones from the Rosebank field.
Marine and Petroleum Geology.
ISSN 0264-8172.
98,
p. 335–355.
doi:
10.1016/j.marpetgeo.2018.08.026.
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Smelror, Morten; Fossum, Katrine; Dypvik, Henning; Hudson, Wellington & Amina, Mweneinda
(2018).
Late Jurassic-Early Cretaceous palynostratigraphyof the onshore Mandawa Basin, southeastern Tanzania.
Review of Palaeobotany and Palynology.
ISSN 0034-6667.
258,
p. 248–255.
doi:
10.1016/j.revpalbo.2018.09.001.
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Tan, Pingchuan; Oberhardt, Nikolas; Dypvik, Henning; Riber, Lars & Ferrell, Ray E. Jr
(2017).
Weathering profiles and clay mineralogical developments, Bornholm, Denmark.
Marine and Petroleum Geology.
ISSN 0264-8172.
80,
p. 32–48.
doi:
10.1016/j.marpetgeo.2016.11.017.
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Saprock-saprolite associations were studied by field and laboratory methods (optical microscopy, X-ray powder diffraction, scanning electron microscopy, electron microprobe) in order to describe regolith development in the crystalline rocks of the Nygård kaolin pit (Bornholm, Denmark). The clay sequences and stages of porosity development are similar to those observed for reservoir rocks from the Utsira High (Riber et al., 2016). The weathering of the parent granite began before the end of the Mesozoic. Two stages of syn-/pre-burial alteration, followed by diagenesis during burial, and then post-uplift weathering have been recognized. In stage Ι, plagioclase and some biotite (biotite-vermiculite-kaolinite) reacted to form elongate booklets of highly-ordered kaolinite or smaller, blocky pseudohexagonal crystals. Stage II represented more extreme weathering developed along local fracture systems. The higher potential for fluid flow in the fractures caused highly-ordered kaolinite to alter to halloysitic, poorly-ordered kaolinite. Plagioclase, biotite, and K-feldspar continued to interact with formation water and formed additional quantities of secondary clay minerals. As a consequence of inter-, intra-, and trans-granular cracks, the original rock fabric deteriorated and porosity increased. During later burial, diagenetic siderite crystals filled voids and chlorite formed at the expense of kaolinite. After re-exposure, calcite precipitated in localized zones. Smectite formed on a broader scale wherever high ionic strength groundwaters were present. A mineralogical key to predicting where high porosity and permeability zones occur is the recognition of halloysitic, poorly-ordered kaolinite. Highly-ordered kaolinite is abundant, but it is ubiquitous. Siderite, chlorite and smectite adversely affect permeability. Tan, Pingchuan, et al. "Weathering profiles and clay mineralogical developments, Bornholm, Denmark." Marine and Petroleum Geology 80 (2017): 32-48. © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license.
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Riber, Lars; Dypvik, Henning; Sørlie, Ronald; Naqvi, Syed Asmar Aal-E-Muhammed; Stangvik, Kristian Bendiksen & Oberhardt, Nikolas
[Show all 7 contributors for this article]
(2017).
Comparison of deeply buried paleoregolith profiles, Norwegian North Sea, with outcrops from southern Sweden and Georgia, USA — Implications for petroleum exploration.
Palaeogeography, Palaeoclimatology, Palaeoecology.
ISSN 0031-0182.
471,
p. 82–95.
doi:
10.1016/j.palaeo.2017.01.043.
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Sundal, Anja; Nystuen, Johan Petter; Rørvik, Kari-Lise; Dypvik, Henning & Aagaard, Per
(2016).
The Lower Jurassic Johansen Formation, northern North Sea – Depositional model and reservoir characterization for CO2 storage.
Marine and Petroleum Geology.
ISSN 0264-8172.
77,
p. 1376–1401.
doi:
10.1016/j.marpetgeo.2016.01.021.
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Riber, Lars; Dypvik, Henning; Sørlie, Ronald & Ferrell, Ray E. Jr
(2016).
Clay minerals in deeply buried paleoregolith profiles, Norwegian North Sea.
Clays and clay minerals.
ISSN 0009-8604.
64(5),
p. 588–607.
doi:
10.1346/CCMN.2016.064036.
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Riber, Lars; Dypvik, Henning & Sørlie, Ronald
(2015).
Altered basement rocks on the Utsira High and its surroundings, Norwegian North Sea.
Norsk Geologisk Tidsskrift.
ISSN 0029-196X.
95(1),
p. 57–89.
doi:
10.17850/njg95-1-04.
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Bastesen, Eivind; Rotevatn, Atle; Braathen, Alvar; Gabrielsen, Roy; Dypvik, Henning & Kalleson, Elin
(2014).
Polyphasal brecciation history revealing the nature and depth of Caledonian contractional deformation in the outboard terranes of West Central Norway.
Norsk Geologisk Tidsskrift.
ISSN 0029-196X.
93,
p. 215–228.
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Azad, Md. Abdus Samad; Dypvik, Henning; Riis, Fridtjof & Kalleson, Elin
(2013).
Late post-impact sedimentation in the Ritland impact structure, western Norway.
Norsk Geologisk Tidsskrift.
ISSN 0029-196X.
93(1),
p. 37–59.
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Kalleson, Elin; Dypvik, Henning; Riis, Fridtjof & Nilsen, Odd
(2013).
The melt-bearing impactites of the Ritland structure; Norway - Implications for melt formation in small impact craters.
Meteoritics and Planetary Science.
ISSN 1086-9379.
48(9),
p. 1678–1701.
doi:
10.1111/maps.12166.
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Nagy, Jenø; Jargvoll, David; Dypvik, Henning; Jochmann, Malte & Riber, Lars
(2013).
Environmental changes during the Paleocene-Eocene Thermal Maximum in Spitsbergen as reflected by benthic foraminifera.
Polar Research.
ISSN 0800-0395.
32.
doi:
10.3402/polar.v32i0.19737.
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Hellevang, Helge; Dypvik, Henning; Kalleson, Elin; Pittarello, Lidia & Koeberl, Christian
(2013).
Can alteration experiments of impact melts from El'gygytgyn and volcanic glasses shed new light on the formation of the Martian surface?
Meteoritics and Planetary Science.
ISSN 1086-9379.
48(7),
p. 1287–1295.
doi:
10.1111/maps.12046.
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Shuvalov, Valery; Dypvik, Henning; Kalleson, Elin; Setså, Ronny & Riis, Fridtjof
(2012).
Modeling the 2.7 km in Diameter, Shallow Marine Ritland Impact Structure.
Earth, Moon, and Planets.
ISSN 0167-9295.
108(3-4),
p. 175–188.
doi:
10.1007/s11038-012-9390-2.
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Azad, Md. Abdus Samad; Dypvik, Henning; Tomczyk, Micahl; Kalleson, Elin & Riis, Fridtjof
(2012).
Late syn-impact and early post-impact sedimentation in the Ritland impact structure, western Norway.
Norsk Geologisk Tidsskrift.
ISSN 0029-196X.
92(4),
p. 405–431.
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Dypvik, Henning & Zakharov, Victor
(2012).
Fine-grained epicontinental Arctic sedimentation - mineralogy and geochemistry of shales from the Late Jurassic-Early Cretaceous transition.
Norsk Geologisk Tidsskrift.
ISSN 0029-196X.
92(2-3),
p. 65–87.
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Nagy, Jenø; Hess, Silvia; Dypvik, Henning & Bjærke, Tor
(2011).
Marine shelf to paralic biofacies of Upper Triassic to Lower Jurassic deposits in Spitsbergen.
Palaeogeography, Palaeoclimatology, Palaeoecology.
ISSN 0031-0182.
300(1-4),
p. 138–151.
doi:
10.1016/j.palaeo.2010.12.018.
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Riber, Lars; Hammer, Erik; Fossum, Katrine & Dypvik, Henning
(2021).
Possible remnants of ancient weathering and landforms in Røysjømarka, south-eastern Norway.
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Riber, Lars; Pera, Emilia Le; Conforti, Massimo; Ietto, Fabio; Dypvik, Henning & Sørlie, Ronald
(2020).
The formation of grus from granites in the Sila Mountains, Calabria, Italy.
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Mahmic, Orhan; Dypvik, Henning; Hammer, Erik; Sørlie, Ronald & Long, Haili
(2016).
Petrographic 3D-imaging and diagenetic modelling of siliciclastic reservoirs.
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Sætre, Christian; Dypvik, Henning & Hellevang, Helge
(2016).
Basaltic glass alteration and its reservoir importance.
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Sætre, Christian; Dypvik, Henning; Hellevang, Helge & Werner, Stephanie C.
(2016).
Earth Mars Analogues - Linking experimental and Martian clays.
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Sørlie, Ronald; Riber, Lars; Dypvik, Henning; Grandal, E.M. & Lie, Jan Erik
(2016).
Altered basement rocks as sediment Source and oil reservoir - the souther Utsira High, Norwegian North Sea.
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Orhan, Mahmic; Dypvik, Henning; Hammer, Erik & Long, Haili
(2016).
3D petrographic imaging and diagenetic modelling of reservoir formations.
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Riber, Lars; Dypvik, Henning; Nikolas, Oberhardt; Said, Naqvi & Ronald, Sørlie
(2014).
Weathering profiles on the Utsira High, Norwegian North Sea - a comparison With onshore analogues.
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Sundal, Anja; Hellevang, Helge; Miri, Rohaldin; Dypvik, Henning; Nystuen, Johan Petter & Per, Aagaard
(2014).
Variations in mineralization potential for CO2 related to sedimentary facies and burial Depth - a comparative study from the North Sea.
Energy Procedia.
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Bastesen, Eivind; Rotevatn, Atle; Braathen, Alvar; Gabrielsen, Roy H.; Dypvik, Henning & Kalleson, Elin
(2013).
Enigmatic breccias at Frøya Island, Mid Norway - impact, faults or fluidization breccia?
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Riber, Lars; Dypvik, Henning; Oberhardt, Nikolas; Naqvi, Seyed & Sørlie, Ronald
(2013).
Saprolitization and formation of sedimentary particles on the southern Utsira High (Edvard Grieg and Johan Sverdrup discoveries) and onshore analogues (Bornholm and Scania).
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Bue, Edina Pozer; Andresen, Arild & Dypvik, Henning
(2013).
New U-Pb LA-ICPMS zircons provenance age data on Triassic sandstones (Vilchekov, Vasilyey and Thegetthoff formations) from Franz Josef Land: Preliminary results.
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Fossum, Katrine; Dypvik, Henning; Riber, Lars & Kaaya, Charles
(2013).
Silica cementation and silcrete formation of the Kilimatinde Cement - Central Tanzania.
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Sundal, Anja; Miri, Rohaldin; Nystuen, Johan Petter; Dypvik, Henning & Aagaard, Per
(2013).
Geologic controls on CO2 injectivity and distribution in the Johansen Formation, northern North Sea.
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Dypvik, Henning; Edwards, Lucy E.; Horton, James Wright Jr; Powars, David S. & Gohn, Greg S.
(2013).
Chesapeake Bay impact crater - development of "brim" sedimentation.
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Sundal, Anja; Miri, Rohaldin; Nystuen, Johan Petter; Dypvik, Henning & Aagaard, Per
(2013).
Modeling CO2 distribution in a heterogeneous sandstone reservoir: the Johansen Formation, northern North Sea.
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Bue, Edina Pozer; Andresen, Arild; Nystuen, Johan Petter & Dypvik, Henning
(2013).
Tracking the progressive filling of the Barents Sea in the Mesozoic using zircon age data.
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Azad, Md. Abdus Samad; Dypvik, Henning; Kalleson, Elin & Riis, Fridtjof
(2012).
Late-post Impact Sedimentation in the Ritland Impact Structure, Western Norway.
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Dypvik, Henning; Hellevang, Helge & Kalleson, Elin
(2012).
Fra Hallingdal til Mars; med Jorden som laboratorium for studier av Mars overflate.
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Sundal, Anja; Nystuen, Johan Petter; Dypvik, Henning; Miri, Rohaldin & Aagaard, Per
(2012).
Effects of geological heterogeneity on CO2 distribution and migration – A case study from the Johansen Formation, Norway.
doi:
10.1016/j.egypro.2013.06.418.
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In characterizing subsurface reservoirs for CO2 storage, the geological heterogeneity distribution is of importance with respect to the injectivity and migration paths. The object of this study is a saline aquifer of Jurassic age; the Johansen Formation of the Northern North Sea. Through scenario modeling the effect of site-typical geological heterogeneities of depositional origin have been tested. The existence of laterally continuous calcite cemented layers and draping mud layers of low permeability in association with flooding events, could compartmentalize the reservoir. This is not necessarily a disadvantage; however, as the sweep efficiency becomes higher when the plume is spread out, potentially increasing the effect of trapping mechanisms.
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Riis, Fridtjof; Kalleson, Elin & Dypvik, Henning
(2012).
Crater Rim Development of the Ritland Impact Structure — Field Observations and Possible Mechanisms.
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Azad, Abdus; Dypvik, Henning; Kalleson, Elin & Riis, Fridtjof
(2012).
Sedimentation in the Ritland Impact Structure, Western Norway.
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Kalleson, Elin; Riis, Fridtjof; Setså, Ronny & Dypvik, Henning
(2012).
Ejecta Distribution and Stratigraphy — Field Evidence from the Ritland Impact Structure.
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Dypvik, Henning; Hellevang, Helge & Kalleson, Elin
(2012).
Alteration of impact melt - implications for our understanding of Noachian of Mars?
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Kalleson, Elin; Dypvik, Henning & Fridtjof, Riis
(2012).
Ejecta distribution and stratigraphy – field evidence from the Ritland impact structure.
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Bastesen, Eivind; Dypvik, Henning; Gabrielsen, Roy H.; Braathen, Alvar; Kalleson, Elin & Rotevatn, Atle
(2012).
Enigmatic breccia at Frøya (Mid Norway) – Impact, fault or fluidization breccia?
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Dypvik, Henning; Hellevang, Helge & Kalleson, Elin
(2011).
From impact melt to clays; experiments and speculations.
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Hanevik, Eivind; Sætre, Christian; Helland-Hansen, William & Dypvik, Henning
(2011).
Development of Hollendardalen Formation in Central Spitsbergen with a focus on stratigraphy, depositional environment, diagenesis and provenance.
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Kalleson, Elin & Dypvik, Henning
(2011).
From impact melt to solid rocks- Formation and description of melt-bearing impactites.
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Sundal, Anja; Per, Aagaard; Nystuen, Johan Petter & Dypvik, Henning
(2015).
Geological reservoir characterization for subsurface CO2 storage: Methodologies for evaluation of reservoir quality and effects of depositional heterogeneities.
Akademika Publishing.
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Published
Dec. 10, 2013 7:55 PM
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Jan. 19, 2026 12:03 PM
