Amando Lasabuda

• Faleide, Jan Inge; Abdelmalak, Mohamed Mansour; Minakov, Alexander; Meza Cala, Juan Camilo; Lasabuda, Amando P. E. & Gaina, Carmen [Vis alle 7 forfattere av denne artikkelen] (2024). Eurasia Basin Composite Tectono-Sedimentary Element. Geological Society of London Memoirs. ISSN 0435-4052. 57. doi: 10.1144/m57-2023-16.
• Faleide, Jan Inge; Abdelmalak, Mohamed Mansour; Zastrozhnov, Dmitrii; Lasabuda, Amando P. E.; Hjelstuen, Berit Oline Blihovde & Laberg, Jan Sverre [Vis alle 7 forfattere av denne artikkelen] (2024). Norwegian Sea Oceanic Basin and Prograded Margins Composite Tectono-Sedimentary Element. Geological Society of London Memoirs. ISSN 0435-4052. 57. doi: 10.1144/M57-2023-26. Vis sammendrag

  The Norwegian Sea oceanic basins and prograded margins have developed since NE Atlantic break-up in the earliest Eocene. Significant amounts of sediments were fed to the regionally subsiding and widening Norwegian Sea during the Cenozoic as a result of several phases of uplift and erosion of the bounding shelves and their hinterland. Despite an overall passive-margin evolution, the area experienced tectonic events and associated processes that interrupted the regional subsidence, causing contraction/inversion and tilting. The post-break-up depositional history of the mid-Norwegian margin comprises two main stages: (1) middle Eocene–Pliocene margin subsidence and relatively modest sedimentation during a period of climatic decline; and (2) latest Pliocene–Pleistocene full-scale northern hemisphere glaciations that resulted in deep erosion of shelves and hinterlands, and very high sedimentation rates and large-scale continental margin progradation. Slope failures within rapidly deposited glacial sediments affected both prograded margins, releasing large slides that travelled downslope into the oceanic Norway and Lofoten basins. Despite a long exploration history for hydrocarbon prospects in deeper waters and large amounts of data acquisition, no significant discovery has been made.

• Lasabuda, Amando P. E.; Hanssen, Alfred; Laberg, Jan Sverre; Faleide, Jan Inge; Patton, Henry & Abdelmalak, Mohamed Mansour [Vis alle 8 forfattere av denne artikkelen] (2023). Paleobathymetric reconstructions of the SW Barents Seaway and their implications for Atlantic–Arctic ocean circulation. Communications Earth & Environment. ISSN 2662-4435. 4. doi: 10.1038/s43247-023-00899-y. Fulltekst i vitenarkiv
• Bjordal-Olsen, Stine; Rydningen, Tom Arne; Laberg, Jan Sverre; Lasabuda, Amando P. E. & Knutsen, Stig Morten (2023). Contrasting Neogene–Quaternary continental margin evolution offshore mid-north Norway: Implications for source-to-sink systems. Marine Geology. ISSN 0025-3227. 456. doi: 10.1016/j.margeo.2022.106974. Fulltekst i vitenarkiv Vis sammendrag

  The Neogene–Quaternary development of the ∼700 km long mid-Norwegian and Lofoten–Vesterålen continental margin is reconstructed using a dense grid of 2D seismic data and exploration wellbores. Overall, widespread ocean current-controlled contourite drifts built up along the whole margin segment from the mid-Miocene onwards (c. 11 Ma, Kai Formation). The onset (c. 8.8 Ma) of a large inner shelf progradation (Molo Formation) was, however, restricted to the southern part of the study area, the inner mid-Norwegian shelf. In the Quaternary (c. 2.7 Ma), grounded ice sheets repeatedly brought large sediment volumes (Naust Formation) to the shelf beyond the Molo Formation. A similar build-out is less pronounced further north, where contourite drift growth instead continued and resulted in build-up of the Lofoten and Vesterålen drifts. In contrast, the drifts of the southern part of the study area occur for the most part stratigraphically below, interbedded with and distal to the progradational Molo and Naust deposits. The study area exemplifies pronounced variability in Neogene–Quaternary continental margin growth. The wide and gently dipping mid-Norwegian margin facilitated coastal and shelf progradation related to fluvial and glacial processes, while the narrow and steep Lofoten–Vesterålen margin received little input from these sources although exposed to the same paleoclimate. Instead, erosion of canyons promoted downslope reworking across the slope and into the deep basins. This low sediment input is interpreted to be controlled by the alpine relief in the north resulting in a small source area and thus low fluvial and glacial sediment input. To the south, hinterland relief allowed for a much larger fluvial and later, glacial source area. Both margin segments were also influenced by contour currents throughout the studied period. We emphasize their importance for understanding the role of erosion and deposition in source-to-sink systems, and thus the need for these processes to be integrated within source-to-sink models

• Patton, Henry; Hubbard, Alun; Heyman, J.; Alexandropoulou, Nikolitsa; Lasabuda, Amando P. E. & Stroeven, A.P. [Vis alle 11 forfattere av denne artikkelen] (2022). The extreme yet transient nature of glacial erosion. Nature Communications. ISSN 2041-1723. 13. doi: 10.1038/s41467-022-35072-0. Fulltekst i vitenarkiv Vis sammendrag

  Ice can sculpt extraordinary landscapes, yet the efficacy of, and controls governing, glacial erosion on geological timescales remain poorly understood and contended, particularly across Polar continental shields. Here, we assimilate geophysical data with modelling of the Eurasian Ice Sheet — the third largest Quaternary ice mass that spanned 49°N to 82°N — to decipher its erosional footprint during the entire last ~100 ka glacial cycle. Our results demonstrate extreme spatial and temporal heterogeneity in subglacial erosion, with rates ranging from 0 to 5 mm a−1 and a net volume equating to ~130,000 km3 of bedrock excavated to depths of ~190 m. A hierarchy of environmental controls ostensibly underpins this complex signature: lithology, topography and climate, though it is basal thermodynamics that ultimately regulates erosion, which can be variously protective, pervasive, or, highly selective. Our analysis highlights the remarkable yet fickle nature of glacial erosion — critically modulated by transient ice-sheet dynamics — with its capacity to impart a profound but piecemeal geological legacy across mid- and high latitudes

• Plaza-Faverola, Andreia; Vadakkepuliyambatta, Sunil; Singhroha, Sunny; Hong, Wei-Li; Waghorn, Kate Alyse & Lasabuda, Amando Putra Ersaid [Vis alle 9 forfattere av denne artikkelen] (2022). Gas Hydrate Related Bottom-Simulating Reflections Along the West-Svalbard Margin, Fram Strait, World Atlas of Submarine Gas Hydrates in Continental Margins. Springer Nature. ISSN 9783030811853. s. 225–235. doi: 10.1007/978-3-030-81186-0_18. Vis sammendrag

  Gas hydrate systems along the west-Svalbard margin exist in a unique polar margin setting characterized by: (1) changes in sub-seabed pressure due to glacial isostatic rebound and flexure since the onset of glaciations at 2.7 Ma; (2) rapid fluctuations in sediment delivery towards the continental slope associated with glacial dynamics; (3) bottom current variations in both temperature and position along the slope; and (4) geothermal gradient variations (80–160 °C/km) and near-surface deformation associated with ultra-slow mid-ocean ridge spreading. Along this polar margin, the base of the gas hydrate stability zone and thus the depth of the bottom simulating reflection (BSR) adapts to these changes in both pressure and temperature. However, it is the presence of a focused fluid flow system sustained by microbial, thermogenic and possibly even abiotic gas sources reaching the near-surface that determines the distribution of BSRs across the margin. Thus, gas hydrate stability, and therefore BSR dynamics in this polar margin, respond to a mixture of complex mechanisms affecting the system from the top and from the bottom. In this article we describe the structural, sedimentary and oceanographic setting, the type of gas hydrate-related BSRs and the different geological footprints (e.g., gas chimneys, pockmarks, brecciated pathways, mounds) associated with the migration of shallow gas through the gas hydrate stability zone over geological time along the west-Svalbard margin.

• Fitnawan, Eko Awan Yudha & Lasabuda, Amando P. E. (2021). Towards Achieving Indonesia’s Oil Production Target of 1 MMBOPD by 2030. SPE Journal. ISSN 1086-055X. doi: 10.2118/205753-MS.
• Lasabuda, Amando Putra Ersaid; Johansen, Nora Johanne Synnestvedt; Laberg, Jan Sverre; Faleide, Jan Inge; Senger, Kim & Rydningen, Tom Arne [Vis alle 9 forfattere av denne artikkelen] (2021). Cenozoic uplift and erosion of the Norwegian Barents Shelf – A review. Earth-Science Reviews. ISSN 0012-8252. 217. doi: 10.1016/j.earscirev.2021.103609. Fulltekst i vitenarkiv Vis sammendrag

  Uplift and erosion are complex phenomena in terms of their governing processes, precise timing and exact magnitude. The intricate relationship between different geodynamic processes leading to uplift may increase uncertainties in estimating spatial and temporal patterns. Sediment distribution from uplifted (and eroded) topography and the corresponding paleoenvironmental reconstructions require reliable constrains. The Barents Shelf provides a unique arena to study uplift and erosion due to extensive seismic and well data attributed to high petroleum activity. This particular interest has led to a voluminous literature about this topic over the last three decades. Here, we present the current status of the Cenozoic uplift and erosion on the Norwegian Barents Shelf by reviewing the key terminology, its tectonic history and paleoenvironment, methods in quantifying uplift and erosion, as well as timing and possible mechanisms. Our new erosion maps show an increase in net erosion to the north and northeast that represents key underlying concepts, including tectonic (compression, rift-flank uplift, thermo-mechanical coupling, mantle dynamics, flexural/isostatic response) as well as magmatic and glacial processes. We have integrated pre-glacial and glacial net erosion using the mass balance method and added our results from sonic velocity, interval velocity and sandstone diagenesis methods to the new maps. This review shows that discrepancies of net erosion estimates from different methods are on the order of 500 m. Finally, we identify research gaps for future studies, with implications for the Barents Shelf and other uplifted basins worldwide

• Rydningen, Tom Arne; Høgseth, Gert V.; Lasabuda, Amando Putra Ersaid; Laberg, Jan Sverre; Safronova, Polina & Forwick, Matthias (2020). An Early Neogene—Early Quaternary Contourite Drift System on the SW Barents Sea Continental Margin, Norwegian Arctic. Geochemistry Geophysics Geosystems. ISSN 1525-2027. 21(11). doi: 10.1029/2020GC009142. Fulltekst i vitenarkiv Vis sammendrag

  The onset and evolution of the middle to late Cenozoic “icehouse” world was influenced by the development of the global ocean circulation linking the Norwegian–Greenland Sea-Arctic Ocean to the Atlantic Ocean. The evolution of the early Neogene to early Quaternary Bjørnøyrenna Drift, located at the SW Barents Sea continental margin, shed new light on this important hydrological event. By analyzing seismic data and exploration wellbores, it is found that the drift likely started to form in the early/middle Miocene, probably as a result of an ocean circulation reorganization following the opening of the Fram Strait gateway (c. 17 Ma) and subsidence of the Greenland–Scotland Ridge (c. 12 Ma). Thus, the onset of drift growth is considered to have happened close in time to the Mid Miocene Climatic Optimum at 16–14 Ma, and was part of a regional onset of large-scale ocean circulation in the Norwegian–Greenland Sea that influenced the subsequent climate cooling. The drift continued to grow under the influence of early Quaternary glacimarine sedimentation, and later overtopping of the drift mound by downslope transfer of glacigenic sediments during full-glacial conditions resulted in a submarine failure. For the first time, minimum average sedimentation rates of a Neogene to Quaternary drift in this area is calculated, giving rates of 0.020–0.031 m/Kyr. These values are comparable to average deep-sea sedimentation rates from modern low-latitude river systems such as the Amazon and Mississippi, but lower than the Quaternary glacial sedimentation rates from the Barents Sea and Fennoscandian continental margins

• Lasabuda, Amando Putra Ersaid; Geissler, Wolfram H.; Laberg, Jan Sverre; Knutsen, Stig-Morten; Rydningen, Tom Arne & Berglar, Kai (2018). Late Cenozoic erosion estimates for the northern Barents Sea: Quantifying glacial sediment input to the Arctic Ocean. Geochemistry Geophysics Geosystems. ISSN 1525-2027. 19(12), s. 4876–4903. doi: 10.1029/2018GC007882. Fulltekst i vitenarkiv
• Lasabuda, Amando Putra Ersaid; Laberg, Jan Sverre; Knutsen, Stig-Morten & Høgseth, Gert (2018). Early to middle Cenozoic paleoenvironment and erosion estimates of the southwestern Barents Sea: Insights from a regional mass-balance approach. Marine and Petroleum Geology. ISSN 0264-8172. 96, s. 501–521. doi: 10.1016/j.marpetgeo.2018.05.039. Fulltekst i vitenarkiv
• Lasabuda, Amando Putra Ersaid; Laberg, Jan Sverre; Knutsen, Stig-Morten & Safronova, Polina (2018). Cenozoic tectonostratigraphy and pre-glacial erosion: A mass-balance study of the northwestern Barents Sea margin, Norwegian Arctic. Journal of Geodynamics. ISSN 0264-3707. 119, s. 149–166. doi: 10.1016/j.jog.2018.03.004. Fulltekst i vitenarkiv

Se alle arbeider i Cristin

• Lasabuda, Amando P. E. (2024). How do we reconstruct paleogeography of glaciated continental margins and their sediment source-to-sink systems? An example from the Barents Sea, Norwegian Arctic.
• Lasabuda, Amando P. E.; Shephard, Grace; Faleide, Jan Inge; Salles, Tristan & Muller, Dietmar (2023). RECONSTRUCTING THE BARENTS SEAWAY IN THE CENOZOIC – THE BRAVO PROJECT. Vis sammendrag

  The Barents Seaway represents an important marine connection between the Atlantic and Arctic oceans. However, how and when precisely the Barents Seaway formed are not very well understood being overshadowed by its neighbor, the Fram Strait Gateway. The Bravo (Barents Sea Evolution) project will address this issue and aims at reconstructing the Barents Seaway paleobathymetry in the Cenozoic. The key challenge is to quantify the spatial distribution and temporal evolution of km-scale vertical movement of Cenozoic uplift and erosion due to glaciations and pre-glacial tectonism. BRAVO approach requires a comprehensive analysis of off-shelf sediment estimation, lithospheric strength, and other mantle-related processes in order to produce a reliable model. BRAVO will use extensive seismic and well data, and utilize numerical modelling technique using pyGPlates software. BRAVO will also test the paleobathymetry reconstructions by simulating the corresponding sediment source-to-sink in the Cenozoic using pyBadlands, an open-source codes for sediment transport, erosion and depositional processes. BRAVO is a Marie Skłodowska-Curie Actions (MSCA) project funded by the European Union’s Horizon Europe and the Research Council of Norway (2023-2026).

• Kollsgård, Christine Tømmervik; Laberg, Jan Sverre; Rydningen, Tom Arne; Husum, Katrine; Lasabuda, Amando & Forwick, Matthias (2023). Reconstructing Paleoenvironment and Sedimentary Processes of the Northern Barents Sea Continental Slope.
• Rydningen, Tom Arne; Eilertsen, Vårin Trælvik; Kollsgård, Christine Tømmervik; Husum, Katrine; Forwick, Matthias & Laberg, Jan Sverre [Vis alle 8 forfattere av denne artikkelen] (2023). Glacial History of the Northern Barents Sea Reconstructed from Submarine Landforms – Nansen Legacy Results and Research Outlook .
• Patton, Henry Jared; Hubbard, Alun Lloyd; Heyman, Jakob; Alexandropoulou, Nikolitsa; Lasabuda, Amando P. E. & Stroeven, Arjen P [Vis alle 14 forfattere av denne artikkelen] (2023). A time-transgressive perspective of glacial erosion and meltwater beneath the Eurasian ice sheet. Fulltekst i vitenarkiv Vis sammendrag

  The efficacy and controls governing glacial erosion over geological timescales are intricately linked yet remain poorly understood and contended. By assimilating geophysical data with modelling of the Eurasian Ice Sheet - the third largest Quaternary ice mass that spanned 49°N - 82°N - we decipher its erosional footprint during the last ~110 ka glacial cycle. Our results demonstrate extreme spatiotemporal heterogeneity in erosion with short-term rates ranging from 0 - 5 mm a-1 , and a net volume equating to ~130,000 km3 of bedrock excavated to depths of ~190 m. A hierarchy of environmental controls ostensibly underpins this signature: lithology, topography and climate, though it is basal thermodynamics that ultimately regulates erosion, which can be variously protective, pervasive, or, highly selective. A notable signature of this thermomechanically regulated erosional footprint is an increase in the intensity of erosion across upland areas of Fennoscandia and within troughs in the Barents Sea during the last deglaciation compared to the long-term mean. New meltwater landforms mapped from multibeam bathymetry data collected in the Central Barents Sea capture insight into the evolving nature of the subglacial environment of the Barents Sea ice sheet as it thinned and collapsed; the apparent abundance of basal meltwater, which we interpret was increasingly being supplemented by inputs from supraglacial melting, likely contributed to elevated erosion of the sedimentary substrate and the mobilisation of subglacial sediments during the latter stages of deglaciation

• Lasabuda, Amando P. E. (2022). Tectonostratigraphy and source-to-sink analyses in the Barents Sea, Norway.
• Lasabuda, Amando P. E. (2022). Sediment source-to-sink analysis in the Norwegian Arctic. Fulltekst i vitenarkiv
• Lasabuda, Amando P. E.; Hanssen, Alfred; Laberg, Jan Sverre; Rydningen, Tom Arne; Patton, Henry & Faleide, Jan Inge [Vis alle 8 forfattere av denne artikkelen] (2022). Underexplored continental shelf gateways: timing, mechanisms and role of SW Barents Sea Gateway, Norwegian Arctic. Fulltekst i vitenarkiv
• Lasabuda, Amando P. E.; Chiarella, Domenico; Sømme, Tor Oftedal; Hanssen, Alfred; Laberg, Jan Sverre & Rydningen, Tom Arne [Vis alle 7 forfattere av denne artikkelen] (2022). A multi-source-to-sink system in a dynamic plate tectonic setting: the Cenozoic of the Barents Sea, Norwegian Arctic. Fulltekst i vitenarkiv
• Bjordal-Olsen, Stine; Rydningen, Tom Arne; Laberg, Jan Sverre; Lasabuda, Amando P. E. & Knutsen, Stig Morten (2022). Contourites and sediment progradation along the Norwegian continental margin during the Neogene–Quaternary.
• Kollsgård, Christine Tømmervik; Laberg, Jan Sverre; Rydningen, Tom Arne; Husum, Katrine; Lasabuda, Amando P. E. & Forwick, Matthias [Vis alle 7 forfattere av denne artikkelen] (2022). Integrating XRF-ratios for Arctic paleoenvironmental reconstructions.
• Patton, Henry; Hubbard, Alun Lloyd; Heyman, Jakob; Alexandropoulou, Nikolitsa; Lasabuda, Amando P. E. & Stroeven, Arjen [Vis alle 11 forfattere av denne artikkelen] (2022). A time-transgressive perspective of glacial erosion beneath the Eurasian ice sheet. Vis sammendrag

  The Eurasian ice sheet shaped the north-western European continental shelf through kilometre-scale denudation processes, sediment transfer, and related uplift during repeated glacial cycles over the Quaternary. These significant mass redistributions, as well as playing important roles in sculpting landscapes across geological timescales, also have a significant effect on subsurface hydrocarbon systems, through the tilting of reservoirs, shifting of migration routes, and the reduction of seal strength. However, constraints regarding the efficacy and controls on glacial erosion are poorly known, in particular for polar ice sheets over timescales of 100,000 years and more. We assimilate geological data with ice sheet modelling to investigate the time-transgressive erosional patterns during the last ~110 ka glacial cycle beneath the Eurasian ice sheet. Our results demonstrate extreme rates and a complex spatial variability of glacial erosion ranging from 0 to >5 mm per year across contrasting topographic settings and geological provinces. Bedrock lithologies and thermomechanical boundary conditions are key factors determining long-term erosion rates, particularly across high-elevation plateaus during deglaciation phases. Maximum suspended sediment fluxes peaked during the Bølling-Allerød warming c. 15 ka, up to an order-of-magnitude greater than contemporary rates from the Greenland ice sheet. The downstream impact in marine ecosystems was substantial, increasing the far-field supply of bioavailable micronutrients to promote phytoplankton blooms and thus yielding a major carbon sink. The highly selective subglacial erosion across shield margins, along with episodes of extreme rates driven by abrupt disequilibrium within the climate-cryosphere-landscape system, provide essential context to contemporary process studies that evidence exceptionally high rates of erosion as ice sheets respond to increased meltwater flux and deglaciate under abrupt climate warming

• Kollsgård, Christine Tømmervik; Rydningen, Tom Arne; Laberg, Jan Sverre; Forwick, Matthias; Lasabuda, Amando P. E. & Husum, Katrine (2022). Sedimentary processes and paleoenvironment of the northern Barents Sea continental slope. Nordic Geological Winter Meeting.
• Kollsgård, Christine Tømmervik; Laberg, Jan Sverre; Rydningen, Tom Arne; Husum, Katrine; Lasabuda, Amando Putra Ersaid & Forwick, Matthias (2021). Sedimentary processes on the continental slope north of Kvitøya (northern Barents Sea) – preliminary results from regional bathymetry and sediment cores.
• Olsen, Stine Bjordal; Rydningen, Tom Arne; Laberg, Jan Sverre; Lasabuda, Amando Putra Ersaid & Knutsen, Stig-Morten (2021). Miocene continental margin growth dominated by deposits from ocean currents – an example from offshore Norway.
• Patton, Henry; Hubbard, Alun Lloyd; Heyman, J.; Alexandropoulou, Nikolitsa; Lasabuda, Amando Putra Ersaid & Stroeven, A.P. [Vis alle 11 forfattere av denne artikkelen] (2021). A time-transgressive perspective of glacial erosion beneath the Eurasian ice sheet.
• Kollsgård, Christine Tømmervik; Laberg, Jan Sverre; Rydningen, Tom Arne; Husum, Katrine; Lasabuda, Amando Putra Ersaid & Szidat, Sönke [Vis alle 7 forfattere av denne artikkelen] (2021). Sedimentary processes and lithological records from the continental slope north of Kvitøya (northern Barents Sea).
• Kollsgård, Christine Tømmervik; Laberg, Jan Sverre; Rydningen, Tom Arne; Husum, Katrine; Lasabuda, Amando Putra Ersaid & Forwick, Matthias (2021). Sedimentary processes on the continental slope north of Kvitøya (northern Barents Sea) – preliminary results from regional bathymetry and sediment cores .
• Kollsgård, Christine Tømmervik; Laberg, Jan Sverre; Rydningen, Tom Arne; Husum, Katrine; Lasabuda, Amando Putra Ersaid & Forwick, Matthias (2020). Depositional processes on the Kvitøya continental slope to reconstruct the dynamics of the northern Barents Sea Ice Sheet.
• Kollsgård, Christine Tømmervik; Laberg, Jan Sverre; Rydningen, Tom Arne; Husum, Katrine; Lasabuda, Amando Putra Ersaid & Forwick, Matthias (2020). Dynamics of the northern Barents Sea Ice Sheet during the last glacial – interglacial cycle.
• Olsen, Stine Bjordal; Rydningen, Tom Arne; Laberg, Jan Sverre; Lasabuda, Amando Putra Ersaid & Knutsen, Stig-Morten (2020). Cenozoic sedimentary environments of the Vesterålen continental margin. Vis sammendrag

  The Cenozoic strata of the Vesterålen continental margin are studied using multi-channel 2D seismic data. The study area encompasses the Loften and Harstad basins and lies along a particularly steep and narrow segment of the Norwegian margin. The early Cenozoic evolution of the margin comprised rifting and opening of the Norwegian-Greenland Sea, which created accommodation space on the continental slope and in the newly formed ocean basin. In the earliest Eocene, igneous processes dominated in the eastern part of the basin, resulting in the deposition of lavas, tuffs and possibly some intrusions, observed as discontinuous high-amplitude seismic reflections. In the early Eocene to mid-Miocene strata, a chaotic seismic facies on the slope indicates mass wasting activity, while parallel-layered continuous reflections in the basin indicate hemipelagic deposition and/or turbidity currents (unit A). Parts of the basin succession show a mounded onlapping relationship to the underlying sediments, characteristic of contourites. This might suggest that restricted oceanic circulation began in the newly formed basin during the early Cenozoic. Contourite development shifted onto the slope later in the period. From mid-Miocene, widespread contourite build-up, both on the slope and in the basin, indicate intensified oceanic circulation (unit B). This is likely a result of the opening of the Fram Strait and subsidence of the Greenland-Scotland Ridge, allowing for a fully ventilated Norwegian-Green-land Sea, i.e. with connections to the North Atlantic in the south and the Arctic Ocean in the north. Focused mass transport activity to the basin indicates that canyons on the slope developed shortly after the mid-Miocene. During the Quaternary, glaciers traversed the shelf forming glacial troughs. Material eroded from ice streams in these troughs was delivered directly into the canyons, which efficiently transported sediments into the basin where they accumulated as submarine fans at the canyon outlets. The slope, thereby acted as a sediment bypass zone. Contourites continued to develop on the slope and in the basin throughout the Quaternary (unit C).

• Olsen, Stine Bjordal; Rydningen, Tom Arne; Laberg, Jan Sverre; Lasabuda, Amando Putra Ersaid & Knutsen, Stig-Morten (2020). Miocene sedimentary environments of the northern Mid-Norwegian continental margin. Vis sammendrag

  The Miocene evolution of the northern part of the Mid-Norwegian margin is studied using a dense grid of 2D seismic data together with results from exploration wells on the Vøring margin. The earliest Cenozoic evolution involves rifting, opening and seafloor spreading in the Norwegian-Greenland Sea, which created accommodation space in a marine to shallow-marine setting on this margin. Low to moderate amplitude parallel-layered reflections in the Miocene Kai Formation is interpreted to represent deep-water hemipelagic deposition in the Vøring Basin. Although the Norwegian-Greenland Sea deepened and widened as seafloor spreading evolved, the Mid-Norwegian margin experienced compressional forces during the Cenozoic. This caused doming along the Norwegian-Greenland Sea basin margin, which largely affected the depositional pattern of the Kai Formation. Very thin deposits characterize the dome crests, whereas thicker accumulations fill in the basins between the domes. These accumulations typically have elongated shapes oriented in a SSW-NNE direction. The largest accumulation is present on the slope and is ~200 km long, between 40 and 110 km wide and up to ~520 m thick. A pronounced divergent reflection configuration with associated moat structures characterize these elongated accumulations. Progressive onlap are typical for their upslope reflection terminations, while low-angle downlap often characterize the downslope terminations. These characteristics are altogether typical of contourites deposited from ocean currents, indicating the presence of a well-established oceanic circulation with a persistent current direction along the Norwegian margin during deposition of the Kai Formation. Eastwards of the Kai Formation, steeply dipping clinoforms of the Molo Formation testify to a coastal outbuilding. An internal chaotic seismic facies on the lower slope suggest that parts of the Molo Formation has failed.

• Rydningen, Tom Arne; Lasabuda, Amando Putra Ersaid; Laberg, Jan Sverre; Kollsgård, Christine Tømmervik; Olsen, Stine Bjordal & Forwick, Matthias [Vis alle 8 forfattere av denne artikkelen] (2020). New results on the dynamics of the NW part of the Svalbard Ice Sheet during the deglaciation of the Woodfjorden Trough . Vis sammendrag

  Present-day warming is most pronounced at high latitudes, raising concern for the stability of modern ice caps such as the ones overlying the Svalbard archipelago. Palaeo-records give us opportunity to understand past behavior of these systems, including the ice retreat from the continental shelf at the end of the last glaciation. In order to evaluate and reconstruct this in a robust way, it is essential that we acquire high-quality data sets covering key areas in the Arctic. New multi-beam bathymetric data was acquired in July 2019 from the Woodfjorden Trough; an up to 60 km long and 40 km wide transverse trough on the northwestern part of the Svalbard continental shelf. Previous investigations have shown that this trough was occupied by a major ice stream draining the Svalbard Ice Sheet during the last glacial, but the deglacial dynamics of this sector of the Svalbard Ice Sheet are presently not well constrained. The new data reveal a complex seabed morphology including larger (2 km wide, 50 m high) and smaller (100 m wide, 3 m high) ridges, as well as sediment wedges (1 to 2 km wide, 30 m high), partly showing crosscutting relationships. These ridges and wedges are discontinuous in the outer part of the trough, where they are partly superposed by glacial lineations and small- to larger sized iceberg ploughmarks (up to 1500 m wide and 30 m deep). In the middle part of the trough, more continuous ridges dominate. The ridges and wedges are interpreted to be glacial landforms formed by grounded ice within the Woodfjorden Trough. Their crosscutting relationships testify to a complex deglaciation, including several advances and still stands of the ice front during overall ice retreat, and their size could indicate that the glacier front was stable for some time. Smaller ridges may be retreat moraines formed during shorter (annual?) still stands of the glacier front. Based on their discontinuous characteristics, the ridges and wedges in the outer part of the trough may pre-date the final Late Weichselian deglaciation, i.e. they may have been overridden by a grounded glacier. The more continuous character of the ridges in the middle part of the trough indicate that these likely date from the Late Weichselian deglaciation. The glacial landforms identified here are rather atypical for glacial troughs, commonly dominated by mega-scale glacial lineations superposed by one or a few grounding zone wedges and/or smaller retreat moraines. The abundant morainal systems and glacial lineations of the Woodfjorden Trough, instead, testify to highly dynamic grounded ice occupying the trough, and a retreat which was characterized by several periods of ice margin stability, interrupted by readvances. This fits with recent studies from onshore areas, showing that the deglaciation of northern Svalbard was at least partly characterized by glacial readvances during the overall ice retreat.

• Kollsgård, Christine Tømmervik; Laberg, Jan Sverre; Rydningen, Tom Arne; Husum, Katrine; Lasabuda, Amando Putra Ersaid & Forwick, Matthias (2020). Dynamics of the northern Barents Sea Ice Sheet during the last glacial – interglacial cycle: preliminary results.
• Rydningen, Tom Arne; Eilertsen, Vårin Trælvik; Forwick, Matthias; Husum, Katrine; Lasabuda, Amando Putra Ersaid & Laberg, J S [Vis alle 7 forfattere av denne artikkelen] (2019). The deglaciation of the NW Barents Sea - new insights from swath-bathymetry and sub-bottom profiler data from east of the Svalbard archipelago.
• Lasabuda, Amando Putra Ersaid (2019). Combreros: Cenozoic Modelling of the Barents Sea Erosion.
• Lasabuda, Amando Putra Ersaid; Laberg, Jan Sverre; Faleide, Jan Inge; Knutsen, Stig-Morten; Rydningen, Tom Arne & Hanssen, Alfred (2019). Reviewing Cenozoic uplift and erosion of the Barents Sea: a new net erosion map from integration of various methods.
• Lasabuda, Amando Putra Ersaid (2019). Late Cenozoic glaciations in the northern Barents Sea: insights from seismic geomorphology & source-to-sink study.
• Lasabuda, Amando Putra Ersaid (2019). Multi-source to sink and Eocene clinoform in the SW Barents Sea: a forward stratigraphic modelling.
• Olsen, Stine Bjordal; Rydningen, Tom Arne; Laberg, Jan Sverre; Myrvang, Jim S.; Lasabuda, Amando Putra Ersaid & Knutsen, Stig-Morten (2019). Cenozoic sedimentary environments of the Vesterålen continental margin.
• Lasabuda, Amando Putra Ersaid; Laberg, Jan Sverre; Knutsen, Stig-Morten & Rydningen, Tom Arne (2019). Reviewing the Cenozoic Net Erosion of the Barents Sea Shelf. Fulltekst i vitenarkiv
• Lasabuda, Amando Putra Ersaid; Laberg, Jan Sverre; Knutsen, Stig-Morten & Rydningen, Tom Arne (2018). Cenozoic Erosion of the Barents Sea Shelf, Norwegian Arctic: A Review . Fulltekst i vitenarkiv
• Rydningen, Tom Arne; Høgseth, Gert; Lasabuda, Amando Putra Ersaid; Laberg, Jan Sverre & Safronova, Polina (2018). Quaternary contourite drift system on the SW Barents Sea margin.
• Os, Vibeke & Lasabuda, Amando Putra Ersaid (2018). Utforsket havbunnen nord og sør for Svalbard. [Internett]. uit.no/nyheter.
• Lasabuda, Amando Putra Ersaid; Geissler, Wolfram H.; Laberg, Jan Sverre; Knutsen, Stig-Morten; Rydningen, Tom Arne & Berglar, Kai (2018). Late Cenozoic glacial sediment input to the Arctic Ocean – quantifying the contribution from the Barents Sea sector.
• Lasabuda, Amando Putra Ersaid; Geissler, Wolfram H.; Laberg, Jan Sverre; Knutsen, Stig-Morten & Rydningen, Tom Arne (2018). Late Cenozoic paleoenvironment and erosion estimates for the northeastern Svalbard/northern Barents Sea continental margin, Norwegian Arctic.
• Lasabuda, Amando Putra Ersaid; Geissler, Wolfram H; Laberg, Jan Sverre & Knutsen, Stig-Morten (2017). Late Cenozoic paleoenvironment and erosion estimates for the NE Svalbard continental margin – preliminary results. Fulltekst i vitenarkiv
• Lasabuda, Amando Putra Ersaid; Laberg, Jan Sverre; Knutsen, Stig-Morten & Safronova, Polina (2017). The Early to Middle Cenozoic Paleoenvironment and Erosion Estimates for the northwestern Barents Sea. Fulltekst i vitenarkiv
• Lasabuda, Amando Putra Ersaid; Laberg, Jan Sverre; Knutsen, Stig-Morten; Safronova, Polina & Høgseth, Gert (2017). The Cenozoic pre-glacial tectono-sedimentary development of the western Barents Sea margin: implications for uplift and erosion of the sediment source areas. Fulltekst i vitenarkiv
• Lasabuda, Amando Putra Ersaid; Laberg, Jan Sverre; Knutsen, Stig-Morten & Safronova, Polina (2017). The Cenozoic pre-glacial tectono-stratigraphy and erosion estimates for the NW Barents Sea. Fulltekst i vitenarkiv
• Lasabuda, Amando Putra Ersaid; Laberg, Jan Sverre & Rydningen, T. A. (2017). Linking tectonostratigraphy and denudation history: insights from a mass balance approach. Fulltekst i vitenarkiv
• Lasabuda, Amando Putra Ersaid; Laberg, Jan Sverre; Knutsen, Stig-Morten & Safronova, Polina (2017). The NW Barents Sea continental margin as a missing puzzle between the famous Svalbard and SW Barents Sea: Cenozoic tectonic style and erosion estimates.
• Geissler, Wolfram H; Lasabuda, Amando Putra Ersaid; Laberg, Jan Sverre & Knutsen, Stig-Morten (2017). The Cenozoic evolution and sedimentary successions of the southwestern Eurasia Basin and the northern Svalbard/Barents Sea continental margin. Fulltekst i vitenarkiv
• Lasabuda, Amando Putra Ersaid; Laberg, Jan Sverre & Knutsen, Stig-Morten (2016). The Early to Middle Cenozoic Paleoenvironment and Sediment Yield of the southwestern Barents Sea.
• Lasabuda, Amando Putra Ersaid; Laberg, Jan Sverre; Knutsen, Stig-Morten & Høgseth, Gert (2016). Cenozoic’s pre-glacial tectonostratigraphy and erosion estimates for the western Barents Sea margin.
• Lasabuda, Amando Putra Ersaid; Laberg, Jan Sverre & Knutsen, Stig-Morten (2016). The Early to Middle Cenozoic paleoenvironment and sediment yield of the southwestern Barents Sea margin.
• Rasmussen, Tine Lander; Laberg, Jan Sverre; Ofstad, Siri; Rydningen, Tom Arne; Åström, Emmelie Karin Linnea & El Bani Altuna, Naima [Vis alle 8 forfattere av denne artikkelen] (2018). Cruise report - AMGG Cruise to the northern and eastern Svalbard margin on R/V Helmer Hanssen, August 31st – September 12th, 2018. UiT Norges arktiske universitet.
• Lasabuda, Amando Putra Ersaid (2018). Cenozoic tectonosedimentary development and erosion estimates for the Barents Sea continental margin, Norwegian Arctic. UiT Norges arktiske universitet. ISSN 978-82-8236-292-4.
• Rydningen, Tom Arne; Schreck, Michael; Lasabuda, Amando Putra Ersaid; Jansson, Pär & Dølven, Knut Ola (2017). CRUISE REPORT: Educational cruises to Malangsdjupet Trough, Hamrefjorden, Råsa and Helgøyfjorden. GEO-2010 Marine geofag (Marine geosciences). UiT Norges arktiske universitet.
• Lasabuda, Amando Putra Ersaid (2013). 3D seismic geomorphology of submarine channel-levee systems in salt-related slope setting: a case study from the western deepwater Egypt. Universitetet i Bergen.

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