Grace Shephard

• Torsvik, Trond Helge; Steinberger, Bernhard; Shephard, Grace; Doubrovine, Pavel; Gaina, Carmen; Domeier, Mathew; Conrad, Clinton Phillips & Sager, William (2019). Our planet is a complicated dynamic system that is constantly evolving on a continuum of scales. On the large scale, the geography of Earth changes over millions of years due to the slow but constant motion of the tectonic plates and the convection of the mantle beneath them. On very long timescales, plate tectonics is a fascinatingly dramatic phenomenon that assembles and dissects continents, opens and closes oceans, and constructs and dismantles mountains. Unsurprisingly, these processes have. Geochemistry Geophysics Geosystems.  ISSN 1525-2027.  20(7), s 3659- 3689 . doi: 10.1029/2019GC008402
• 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
• 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
• 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
• 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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• 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.
• 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.
• 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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