Grace Shephard

• Crameri, Fabio; Magni, Valentina; Domeier, Mathew; Shephard, Grace Elizabeth; Chotalia, Kiran; Cooper, George; Eakin, Caroline; Grima, Antoniette Greta; Gurer, Derya; Kiraly, Agnes; Mulyukova, Elvira; Peters, Kalijn; Robert, Boris & Thielmann, Marcel (2020). A transdisciplinary and community-driven database to unravel subduction zone initiation. Nature Communications.  ISSN 2041-1723.  11 . doi: 10.1038/s41467-020-17522-9 Full text in Research Archive.
• Crameri, Fabio; Shephard, Grace & Heron, Philip J. (2020). The misuse of colour in science communication. Nature Communications.  ISSN 2041-1723.  11(1) . doi: 10.1038/s41467-020-19160-7
• Gac, Sebastien; Minakov, Alexander; Shephard, Grace; Faleide, Jan Inge & Planke, Sverre (2020). Deformation analysis in the Barents Sea in relation to paleogene transpression along the Greenland-Eurasia plate boundary. Tectonics.  ISSN 0278-7407.  39:e2020TC006172(10), s 1- 26 . doi: 10.1029/2020TC006172 Show summary

  Late Cretaceous‐Cenozoic contractional structures are widespread in the Barents Sea. While the exact dating of the deformation is unclear, it can only be inferred that the contraction is younger than the early Cretaceous. One likely contractional mechanism is related to Greenland Plate kinematics at Paleogene times. We use a thin sheet finite element modeling approach to compute deformation within the Barents Sea in response to the Greenland‐Eurasia relative motions during the Paleogene. The analytical solution for the 3‐D folding of sediments above basement faults is used to assess possibilities for folding. Two existing Greenland Plate kinematic models, differing slightly in the timing, magnitude, and direction of motion, are tested. Results show that the Greenland Plate's general northward motion promotes growing anticlines in the entire Barents Sea shelf. Our numerical models suggest that the fan‐shaped pattern of cylindrical anticlines in the Barents Sea can be associated with the Eurekan deformation concurrent to the initial rifting and early seafloor spreading in the northeast Atlantic. The main contraction phase in the SW Barents Sea coincides with the timing of continental breakup, whereas the peak of deformation predicted for the NW Barents Sea occurred at later times. Svalbard has experienced a prolonged period of compressional deformation. We conclude that Paleogene Greenland Plate kinematics are a likely candidate to explain contractional structures in the Barents Sea

• Crameri, Fabio; Shephard, Grace & Conrad, Clinton Phillips (2019). Plate tectonics, In  Encyclopedia of Ecology. Reference Module in Earth Systems and Environmental Sciences.  Elsevier.  ISBN 978-0-12-409548-9.  Plate tectonics. Full text in Research Archive.
• Torsvik, Trond Helge; Steinberger, Bernhard; Shephard, Grace; Doubrovine, Pavel; Gaina, Carmen; Domeier, Mathew; Conrad, Clinton Phillips & Sager, William (2019). Pacific‐Panthalassic reconstructions: Overview, errata and the way forward. Geochemistry Geophysics Geosystems.  ISSN 1525-2027.  20(7), s 3659- 3689 . doi: 10.1029/2019GC008402 Full text in Research Archive.
• Coltice, Nicolas & Shephard, Grace (2018). Tectonic predictions with mantle convection models. Geophysical Journal International.  ISSN 0956-540X.  213(1), s 16- 29 . doi: 10.1093/gji/ggx531 Full text in Research Archive.
• Hosseini, Kasra; Matthews, Kara J.; Sigloch, Karin; Shephard, Grace; Domeier, Mathew & Tsekhmistrenko, Maria (2018). SubMachine: Web-Based Tools for Exploring Seismic Tomography and Other Models of Earth's Deep Interior. Geochemistry Geophysics Geosystems.  ISSN 1525-2027.  19(5), s 1464- 1483 . doi: 10.1029/2018GC007431 Full text in Research Archive.
• Shephard, Grace; Wiers, Steffen; Bazhenova, Evgenia; Perez, Lara F; Mejia, Luz Maria; Johansson, Carina; Jakobsson, Martin & O'Regan, Matt (2018). A North Pole thermal anomaly? Evidence from new and existing heat flow measurements from the central Arctic Ocean. Journal of Geodynamics.  ISSN 0264-3707.  118, s 166- 181 . doi: 10.1016/j.jog.2018.01.017 Full text in Research Archive.
• Abdelmalak, Mohamed Mansour; Faleide, Jan Inge; Planke, Sverre; Gernigon, Laurent; Zastrozhnov, Dmitry; Shephard, Grace & Myklebust, Reidun (2017). The T-Reflection and the Deep Crustal Structure of the Vøring Margin, Offshore mid-Norway. Tectonics.  ISSN 0278-7407.  36(11), s 2497- 2523 . doi: 10.1002/2017TC004617 Full text in Research Archive.
• Domeier, Mathew; Shephard, Grace; Jakob, Johannes; Gaina, Carmen; Doubrovine, Pavel & Torsvik, Trond Helge (2017). Intraoceanic subduction spanned the Pacific in the Late Cretaceous–Paleocene. Science Advances.  ISSN 2375-2548.  3(11) . doi: 10.1126/sciadv.aao2303 Full text in Research Archive.
• Jones, Morgan Thomas; Augland, Lars Eivind; Shephard, Grace; Burgess, Seth; Eliassen, Gauti Trygvason; Jochmann, Malte; Friis, Bjarki; Jerram, Dougal Alexander; Planke, Sverre & Svensen, Henrik (2017). Constraining shifts in North Atlantic plate motions during the Palaeocene by U-Pb dating of Svalbard tephra layers. Scientific Reports.  ISSN 2045-2322.  7(1) . doi: 10.1038/s41598-017-06170-7 Full text in Research Archive.
• Shephard, Grace Elizabeth; Matthews, Kara J.; Hosseini, Kasra & Domeier, Mathew (2017). On the consistency of seismically imaged lower mantle slabs. Scientific Reports.  ISSN 2045-2322.  7:10976, s 1- 17 . doi: 10.1038/s41598-017-11039-w Full text in Research Archive.
• Fritzell, Eva Hauk; Bull, Abigail & Shephard, Grace Elizabeth (2016). Closure of the Mongol–Okhotsk Ocean: Insights from seismic tomography and numerical modelling. Earth and Planetary Science Letters.  ISSN 0012-821X.  445, s 1- 12 . doi: 10.1016/j.epsl.2016.03.042
• Shephard, Grace Elizabeth; Dalen, Kari; Peldszus, Regina; Aparicio, Sara; Beumer, Larissa; Birkeland, Roger; Gkikas, Nikolaos; Kourantidou, Melina; Ktenas, Panagiotis; Linde, Peter Wilhelm; Marazzi, Francesco; Pincinato, Ruth Beatriz Mezzalira; Radianti, Jaziar; Schartmüller, Bernhard; Stübner, Eike Ingrid; Varnajot, Alix; Vullierme, Magali & Zhilina, Irina (2016). Assessing the added value of the recent declaration on unregulated fishing for sustainable governance of the central Arctic Ocean. Marine Policy.  ISSN 0308-597X.  66, s 50- 57 . doi: 10.1016/j.marpol.2016.01.013 Full text in Research Archive.
• Shephard, Grace Elizabeth; Trønnes, Reidar G; Spakman, Wim; Panet, Isabelle & Gaina, Carmen (2016). Evidence for slab material under Greenland and links to Cretaceous High Arctic magmatism. Geophysical Research Letters.  ISSN 0094-8276.  43(8), s 3717- 3726 . doi: 10.1002/2016GL068424
• Jones, Morgan Thomas; Trygvason Eliassen, Gauti; Shephard, Grace; Svensen, Henrik; Jochmann, Malte; Friis, Bjarki; Augland, Lars Eivind; Jerram, Dougal Alexander & Planke, Sverre (2016). Provenance of bentonite layers in the Palaeocene strata of the Central Basin, Svalbard: implications for magmatism and rifting events around the onset of the North Atlantic Igneous Province. Journal of Volcanology and Geothermal Research.  ISSN 0377-0273.  327, s 571- 584 . doi: 10.1016/j.jvolgeores.2016.09.014
• Müller, R. Dietmar; Seton, Maria; Zahirovic, Sabin; Williams, Simon E.; Matthews, Kara J.; Wright, Nicky M.; Shephard, Grace; Maloney, Kayla T.; Barnett-Moore, Nicholas; Hosseinpour, Maral; Bower, Dan J. & Cannon, John (2016). Ocean basin evolution and global-scale plate reorganization events since Pangea breakup. Annual Review of Earth and Planetary Science.  ISSN 0084-6597.  44, s 107- 138 . doi: 10.1146/annurev-earth-060115-012211
• Abdelmalak, Mohamed Mansour; Andersen, Torgeir Bjørge; Planke, Sverre; Faleide, Jan Inge; Corfu, Fernando; Tegner, Christian; Shephard, Grace; Zastrozhnov, Dmitry & Myklebust, Reidun (2015). The ocean-continent transition in the mid-Norwegian margin: Insight from seismic data and an onshore Caledonian field analogue. Geology.  ISSN 0091-7613.  43(11), s 1011- 1014 . doi: 10.1130/G37086.1 Show summary

  ABSTRACT Understanding the structure of the ocean-continent transition (OCT) in passive margins is greatly enhanced by comparison with onshore analogues. The North Atlantic margins and the “fossil” system in the Scandinavian Caledonides show variations along strike between magma-rich and magma-poor margins, but are different in terms of exposure and degree of maturity. They both display the early stages of the Wilson cycle. Seismic reflection data from the mid-Norwegian margin combined with results from Ocean Drilling Program Leg 104 drill core 642E allow for improved subbasalt imaging of the OCT. Below the Seaward- Dipping Reflector (SDR) sequences, vertical and inclined reflections are interpreted as dike feeder systems. High-amplitude reflections with abrupt termination and saucer-shaped ge- ometries are interpreted as sill intrusions, implying the presence of sediments in the transi- tion zone beneath the volcanic sequences. The transitional crust located below the SDR of the mid-Norwegian margin has a well-exposed analogue in the Seve Nappe Complex (SNC). At Sarek (Sweden), hornfelsed sediments are truncated by mafic dike swarms with densi- ties of 70%–80% or more. The magmatic domain extends for at least 800 km along the Caledonides, and probably reached the size of a large igneous province. It developed at ca. 600 Ma on the margin of the Iapetus Ocean, and was probably linked to the magma-poor hyperextended segment in the southern Scandinavian Caledonides. These parts of the SNC represent an onshore analogue to the deeper level of the mid-Norwegian margin, permitting direct observation and sampling and providing an improved understanding, particularly of the deeper levels, of present-day magma-rich margins.

• Butterworth, Nathaniel; Talsma, Aedon; Muller, Dietmar; Seton, Maria; Bunge, Hans-Peter; Schuberth, Bernhard; Shephard, Grace & Heine, Christian (2014). Geological, tomographic, kinematic and geodynamic constraints on the dynamics of sinking slabs. Journal of Geodynamics.  ISSN 0264-3707.  73, s 1- 13 . doi: 10.1016/j.jog.2013.10.006
• Shephard, Grace; Flament, Nicolas; Williams, Simon; Seton, Maria; Gurnis, Michael & Müller, R. Dietmar (2014). Circum-Arctic mantle structure and long-wavelength topography since the Jurassic. Journal of Geophysical Research (JGR): Solid Earth.  ISSN 2169-9313.  119(10), s 7889- 7908 . doi: 10.1002/2014JB011078
• Shephard, Grace; Muller, Dietmar & Seton, Maria (2013). The tectonic evolution of the Arctic since Pangea breakup: Integrating constraints from surface geology and geophysics with mantle structure. Earth-Science Reviews.  ISSN 0012-8252.  124, s 148- 183 . doi: 10.1016/j.earsscirev.2013.05.012
• Shephard, Grace Elizabeth; Bunge, Hans-Peter; Schuberth, Bernhard; Muller, Dietmar; Talsma, Aedon; Moder, Christoph & Landgrebe, Thomas (2012). Testing absolute plate reference frames and the implications for the generation of geodynamic mantle heterogeneity structure. Earth and Planetary Science Letters.  ISSN 0012-821X.  317(204) . doi: 10.1016/j.epsl.2011.11.027
• Shephard, Grace Elizabeth; Liu, Lijun; Muller, Dietmar & Gurnis, M (2012). Dynamic topography and anomalously negative residual depth of the Argentine Basin. Gondwana Research.  ISSN 1342-937X.  22(2), s 1- 13 . doi: 10.1016/j.jog.2013.10.006
• Shephard, Grace Elizabeth; Muller, Dietmar; Liu, Lijun & Gurnis, Michael (2010). Miocene drainage reversal of the Amazon River driven by plate-mantle interaction. Nature Geoscience.  ISSN 1752-0894.  3, s 870- 875 . doi: 10.1038/ngeo1017

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• Chotalia, Kiran; Cooper, George; Crameri, Fabio; Domeier, Mathew; Eakin, Caroline; Grima, Antoniette Greta; Gurer, Derya; Kiraly, Agnes; Magni, Valentina; Mulyukova, Elvira; Peters, Kalijn; Robert, Boris; Shephard, Grace & Thielmann, Marcel (2020). The trans-disciplinary and community-driven subduction zone initiation (SZI) database.
• Midtkandal, Ivar; Holbrook, John; Faleide, Jan Inge; Myers, Cody; van Yperen, Anna Elisabeth; Shephard, Grace & Nystuen, Johan Petter (2020). Testing arctic tectonic plate models with Cretaceous sediment source to sink budgets.
• Shephard, Grace; Hernlund, John W; Houser, Christine; Trønnes, Reidar G & Crameri, Fabio (2020). Ambient lower mantle structure and composition inferred from seismic tomography, convection models and geochemistry. European Geosci. Union, Gen. Assembly, Geophys. Res. Abstr. EGU2020-11806.. European Geosci. Union, Gen. Assembly, Geophys. Res. Abstr..
• Anfinson, Owen; Odlum, M; Shephard, Grace; Gaina, Carmen; Stockli, Daniel; Finley, Jake & Levang, Devin (2019). Provenance analysis of the Devonian Andrée Land Basin, Svalbard.
• Crameri, Fabio; Chotalia, Kiran; Cooper, George; Domeier, Mathew; Eakin, Caroline; Grima, Antoinette; Gurer, Derya; Kiraly, Agnes; Magni, Valentina; Mulyukova, Elvira; Peters, Kalijn; Robert, Boris; Shephard, Grace & Thielmann, Marcel (2019). Subduction Zone Initiation Database 1.0.
• Crameri, Fabio; Magni, Valentina; Domeier, Mathew; Shephard, Grace; Cooper, George; Chotalia, Kiran; Kiraly, Agnes; Robert, Boris; Eakin, Caroline; Grima, Antoniette Greta; Guerer, Derya; Mulyukova, Elvira; Peters, Kalijn & Thielmann, Marcel (2019). Subduction zone initiation (SZI) database 1.0: Ready, set, model!.
• Domeier, Mathew; Torsvik, Trond Helge; Conrad, Clinton Phillips; Steinberger, Bernhard; Doubrovine, Pavel V.; Trønnes, Reidar G; Werner, Stephanie C.; Shephard, Grace & Robert, Boris (2019). Domeier M, Torsvik TH, Conrad CP, Steinberger B, Doubrovine PV, Trønnes RG, Werner SC, Shephard GE, Robert B, 2019: On the stability of Earth’s degree 2 mantle structure. European Geosci. Union, Gen. Assembly, Geophys. Res. Abstr. EGU2019-10320.. European Geosci. Union, Gen. Assembly, Geophys. Res. Abstr..
• Domeier, Mathew; Torsvik, Trond Helge; Conrad, Clinton Phillips; Steinberger, Bernhard; Doubrovine, Pavel; Trønnes, Reidar G; Werner, Stephanie C.; Shephard, Grace & Robert, Boris (2019). On the stability of Earth’s degree 2 mantle structures.
• Hernlund, John W; Shephard, Grace; Houser, Christine; Wentzcovitch, RM & Trønnes, Reidar G (2019). Hernlund J, Shephard G, Houser C, Wentzcovitch R, Trønnes RG, 2019: Detection of an Iron Spin Transition in Ferro-periclase in the Lower Mantle. AGU Fall Meeting Abstr. U42B-04.. AGU Fall Meeting Abstr..
• Hernlund, John W; Shephard, Grace; Houser, Christine; Wentzcovitch, RM & Trønnes, Reidar G (2019). Hernlund J, Shephard G, Houser C, Wentzcovitch R, Trønnes RG, 2019: Now you see it, now you don’t: Seismic signals of an iron spin transition in the lower mantle. Goldschmidt Conf. Abstr. 02i-Mo-0900.. Goldschmidt Conf. Abstr..
• Odlum, M; Anfinson, Owen; Poulaki, E. M.; Shephard, Grace; Stockli, Daniel & Gaina, Carmen (2019). Thermal record of deformation, exhumation, and fluid-rock interactions along the Billefjorden Fault Zone, Pyramiden, Svalbard.
• Shephard, Grace (2019). Updated plate reconstructions for the Arctic; from Amerasia to the Eurekan..
• Shephard, Grace (2019). Welcome to APECS and APECS Norway.
• Shephard, Grace (2019). Welcome to APECS and APECS Norway.
• Shephard, Grace; Abdelmalak, Mohamed Mansour; Gaina, Carmen; Faleide, Jan Inge; Torsvik, Trond Helge; Jackson, Ruth; Oakey, Gordon; Li, Qingmou & Piepjohn, Karsten (2019). A Greenland centered puzzle: Updated plate reconstructions of the North Atlantic and Arctic.
• Shephard, Grace; Crameri, Fabio & Gaina, Carmen (2019). Shifting around, digging up, and colouring in oceans.
• Shephard, Grace & Gaina, Carmen (2019). The Arctic in deep time and space - plate tectonics in the Arctic.
• Shephard, Grace & Gaina, Carmen (2019). The Arctic in deep time and space: a Earth Scientist's perspective.
• Shephard, Grace; Gaina, Carmen; Torsvik, Trond Helge & Faleide, Jan Inge (2019). Plate tectonics and mantle structure of the Arctic, North Atlantic, and Panthalassa: recent updates.
• Shephard, Grace; Houser, Christine; Hernlund, John W; Wentzcovitch, RM & Trønnes, Reidar G (2019). Shephard GE, Houser C, Hernlund J, Wentzcovitch R, Trønnes R, 2019. Seismic detection of iron spin pairing in ferropericlase and the structure of the lower mantle. Ada Lovelace Workshop on Modelling Mantle and Lithosphere Dynamics. Abstr. 19.. Ada Lovelace Workshop on Modelling Mantle and Lithosphere Dynamics. Abstr..
• Shephard, Grace; Houser, Christine; Hernlund, John W; Wentzcovitch, RM & Trønnes, Reidar G (2019). Shephard GE, Houser C, Hernlund J, Wentzcovitch R, Trønnes R, 2019: Detection of the lower mantle iron spin transition in ferropericlase through vote maps of seismic tomography. European Geosci. Union, Gen. Assembly, Geophys. Res. Abstr. EGU2019-6998. European Geosci. Union, Gen. Assembly, Geophys. Res. Abstr..
• Shephard, Grace; Houser, Christine; Hernlund, John; Trønnes, Reidar G & Wentzcovitch, Renata (2019). Detection of the lower mantle iron spin transition in ferropericlase through vote maps of seismic tomography.
• Shephard, Grace; Houser, Christine; Hernlund, John; Trønnes, Reidar G; Wentzcovitch, Renata & Valencia, Juan (2019). Seismic detection of iron spin pairing in ferropericlase and the structure of the lower mantle.
• Shephard, Grace; Jackson, Ruth; Gaina, Carmen; Piepjohn, Karsten; Oakey, Gordon; Li, Qingmou; Shimeld, John; Midtkandal, Ivar & Boggild, Kai (2019). Updated tectonic reconstructions of the Cretaceous Arctic: Digital plate model and applications..
• Shephard, Grace; Jackson, Ruth; Gaina, Carmen; Piepjohn, Karsten; Oakey, Gordon; Qingmou, Li; Shimeld, John; Midtkandal, Ivar & Boggild, Kai (2019). Updated tectonic reconstructions of the Cretaceous Arctic: Digital plate model and applications..
• Hosseini, Kasra; Matthews, Kara J.; Sigloch, Karin; Shephard, Grace; Domeier, Mathew & Tsekhmistrenko, Maria (2018). SubMachine: Web-based tools for exploring seismic tomography models.
• Faleide, Jan Inge; Abdelmalak, Mohamed Mansour; Shephard, Grace; Torsvik, Trond Helge; Gaina, Carmen; Tsikalas, Filippos; Blaich, Olav Antonio; Planke, Sverre & Myklebust, Reidun (2017). Quantification and restoration of pre-drift extension across NE Atlantic conjugate margins.
• Jones, Morgan Thomas; Augland, Lars Eivind; Shephard, Grace; Burgess, Seth; Eliassen, Gauti; Jerram, Dougal Alexander; Jochmann, Malte; Friis, Bjarki; Planke, Sverre & Svensen, Henrik (2017). Bentonite layers in Svalbard: constraining sources of volcanism, geochronology, and relative plate motions during the Paleogene.
• Faleide, Jan Inge; Planke, Sverre; Abdelmalak, Mohamed Mansour; Zastrozhnov, Dmitrii; Wong, P.W.; Shephard, Grace; Indrevær, Kjetil; Tsikalas, Filippos; Gabrielsen, Roy Helge; Gernigon, Laurent; Blaich, Olav A. & Myklebust, Reidun (2016). Basin architecture and evolution at NE Atlantic conjugate margins.
• Bull, Abigail Louise; Fritzell, Eva Hauk; Mohn, Chris Erik; Prieur, Nils Charles; Rolf, Tobias; Shephard, Grace Elizabeth & Trønnes, Reidar G (2015). Looking inside the Earth, using E-infrastructure resources. Meta 2-2015, 4-9 (and FrontPage). META : Magazine.
• Shephard, Grace Elizabeth (2015). Arctic (Ocean) geology and geophysics.
• Shephard, Grace Elizabeth (2015). Modelling circum-Arctic plate reconstructions and GPlates software.
• Shephard, Grace Elizabeth (2015). Reconstructing the Arctic through deep time and space.
• Shephard, Grace Elizabeth (2015). United Plates of Amasia: Modelling and visualizing the past, present and future Earth.
• Shephard, Grace Elizabeth & Gaina, Carmen (2015). Reconstructing extinct and current Arctic oceans from surface and mantle constraints..
• Bull, Abigail Louise; Torsvik, Trond Helge & Shephard, Grace (2015). Past Plate Motions and The Evolution of Earth’s Lower Mantle: Relating LLSVPs and Plume Distribution.
• Shephard, Grace; Spakman, Wim; Panet, Isabelle; Gaina, Carmen & Trønnes, Reidar G (2015). The Arctic connection - plate tectonics and mantle dynamics in the North Atlantic, North Pacific and the High Arctic. EGU Gen. Assembly, EGU2015-7839..
• Shephard, Grace; Bull, Abigail & Gaina, Carmen (2014). Modelling plate kinematics, slabs and LLSVP dynamics – an example from the Arctic and northern Panthalassa.
• Shephard, Grace; Gurnis, Michael; Flament, Nicolas; Mihalynuk, M; Sigloch, K & Gaina, Carmen (2014). Evaluating alternative models of intra-oceanic subduction of northeastern Panthalassa since the Jurassic.
• Shephard, Grace Elizabeth; Flament, Nicolas; Seton, Maria; Heine, Christian & Müller, R. Dietmar (2013). Mesozoic ocean basins of the circum-Arctic; linking plate tectonics and mantle dynamics.
• Shephard, Grace Elizabeth; Flament, Nicolas; Williams, Simon; Seton, Maria; Gurnis, Michael & Müller, R. Dietmar (2013). Linking mantle structure and dynamic surface topography of the circum-Arctic since the Jurassic.

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