Circum-Arctic mantle structure and long-wavelength topography since the Jurassic
The circum-Arctic is one of the most tectonically complex regions of the world, shaped by a history of ocean basin opening and closure since the Early Jurassic. The region is characterized by contemporaneous large-scale Cenozoic exhumation extending from Alaska to the Atlantic, but its driving force...
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ftunivwollongong:oai:ro.uow.edu.au:smhpapers-5266 2023-05-15T14:52:01+02:00 Circum-Arctic mantle structure and long-wavelength topography since the Jurassic Shephard, G E Flament, Nicolas Williams, Simon E Seton, Maria Gurnis, Michael Muller, R Dietmar 2014-01-01T08:00:00Z application/pdf https://ro.uow.edu.au/smhpapers/4242 https://ro.uow.edu.au/cgi/viewcontent.cgi?article=5266&context=smhpapers unknown Research Online https://ro.uow.edu.au/smhpapers/4242 https://ro.uow.edu.au/cgi/viewcontent.cgi?article=5266&context=smhpapers Faculty of Science, Medicine and Health - Papers: part A article 2014 ftunivwollongong 2020-02-25T11:33:15Z The circum-Arctic is one of the most tectonically complex regions of the world, shaped by a history of ocean basin opening and closure since the Early Jurassic. The region is characterized by contemporaneous large-scale Cenozoic exhumation extending from Alaska to the Atlantic, but its driving force is unknown. We show that the mantle flow associated with subducted slabs of the South Anuyi, Mongol-Okhotsk, and Panthalassa oceans have imparted long-wavelength deflection on overriding plates. We identify the Jurassic-Cretaceous South Anuyi slab under present-day Greenland in seismic tomography and numerical mantle flow models. Under North America, we propose the "Farallon" slab results from Andean-style ocean-continent convergence around ~30°N and from a combination of ocean-continent and intraoceanic subduction north of 50°N. We compute circum-Arctic dynamic topography through time from subduction-driven convection models and find that slabs have imparted on average <1-16 m/Myr of dynamic subsidence across the region from at least 170 Ma to ~50 Ma. With the exception of Siberia, the main phase of circum-Arctic dynamic subsidence has been followed either by slowed subsidence or by uplift of <1-6 m/Myr on average to present day. Comparing these results to geological inferences suggest that subduction-driven dynamic topography can account for rapid Middle to Late Jurassic subsidence in the Slave Craton and North Slope (respectively, <15 and 21 m/Myr, between 170 and 130 Ma) and for dynamic subsidence (<7 m/Myr, ~170-50 Ma) followed by dynamic uplift (<6 m/Myr since 50 Ma) of the Barents Sea region. Combining detailed kinematic reconstructions with geodynamic modeling and key geological observations constitutes a powerful tool to investigate the origin of vertical motion in remote regions. Article in Journal/Newspaper Arctic Barents Sea Greenland north slope Alaska Siberia University of Wollongong, Australia: Research Online Arctic Barents Sea Greenland Okhotsk |
institution |
Open Polar |
collection |
University of Wollongong, Australia: Research Online |
op_collection_id |
ftunivwollongong |
language |
unknown |
description |
The circum-Arctic is one of the most tectonically complex regions of the world, shaped by a history of ocean basin opening and closure since the Early Jurassic. The region is characterized by contemporaneous large-scale Cenozoic exhumation extending from Alaska to the Atlantic, but its driving force is unknown. We show that the mantle flow associated with subducted slabs of the South Anuyi, Mongol-Okhotsk, and Panthalassa oceans have imparted long-wavelength deflection on overriding plates. We identify the Jurassic-Cretaceous South Anuyi slab under present-day Greenland in seismic tomography and numerical mantle flow models. Under North America, we propose the "Farallon" slab results from Andean-style ocean-continent convergence around ~30°N and from a combination of ocean-continent and intraoceanic subduction north of 50°N. We compute circum-Arctic dynamic topography through time from subduction-driven convection models and find that slabs have imparted on average <1-16 m/Myr of dynamic subsidence across the region from at least 170 Ma to ~50 Ma. With the exception of Siberia, the main phase of circum-Arctic dynamic subsidence has been followed either by slowed subsidence or by uplift of <1-6 m/Myr on average to present day. Comparing these results to geological inferences suggest that subduction-driven dynamic topography can account for rapid Middle to Late Jurassic subsidence in the Slave Craton and North Slope (respectively, <15 and 21 m/Myr, between 170 and 130 Ma) and for dynamic subsidence (<7 m/Myr, ~170-50 Ma) followed by dynamic uplift (<6 m/Myr since 50 Ma) of the Barents Sea region. Combining detailed kinematic reconstructions with geodynamic modeling and key geological observations constitutes a powerful tool to investigate the origin of vertical motion in remote regions. |
format |
Article in Journal/Newspaper |
author |
Shephard, G E Flament, Nicolas Williams, Simon E Seton, Maria Gurnis, Michael Muller, R Dietmar |
spellingShingle |
Shephard, G E Flament, Nicolas Williams, Simon E Seton, Maria Gurnis, Michael Muller, R Dietmar Circum-Arctic mantle structure and long-wavelength topography since the Jurassic |
author_facet |
Shephard, G E Flament, Nicolas Williams, Simon E Seton, Maria Gurnis, Michael Muller, R Dietmar |
author_sort |
Shephard, G E |
title |
Circum-Arctic mantle structure and long-wavelength topography since the Jurassic |
title_short |
Circum-Arctic mantle structure and long-wavelength topography since the Jurassic |
title_full |
Circum-Arctic mantle structure and long-wavelength topography since the Jurassic |
title_fullStr |
Circum-Arctic mantle structure and long-wavelength topography since the Jurassic |
title_full_unstemmed |
Circum-Arctic mantle structure and long-wavelength topography since the Jurassic |
title_sort |
circum-arctic mantle structure and long-wavelength topography since the jurassic |
publisher |
Research Online |
publishDate |
2014 |
url |
https://ro.uow.edu.au/smhpapers/4242 https://ro.uow.edu.au/cgi/viewcontent.cgi?article=5266&context=smhpapers |
geographic |
Arctic Barents Sea Greenland Okhotsk |
geographic_facet |
Arctic Barents Sea Greenland Okhotsk |
genre |
Arctic Barents Sea Greenland north slope Alaska Siberia |
genre_facet |
Arctic Barents Sea Greenland north slope Alaska Siberia |
op_source |
Faculty of Science, Medicine and Health - Papers: part A |
op_relation |
https://ro.uow.edu.au/smhpapers/4242 https://ro.uow.edu.au/cgi/viewcontent.cgi?article=5266&context=smhpapers |
_version_ |
1766323146316578816 |