Evidence for a rotation in asthenospheric flow in northwest Canada: insights from shear wave splitting
2021 Spring. Includes bibliographical references. The Mackenzie Mountains (MM) of northwest Canada are an actively uplifting, seismogenic salient of the northern Canadian Cordillera that lie 750 km NE of the nearest plate boundary. We present new shear wave splitting measurements for the region from...
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ftcolostateunidc:oai:mountainscholar.org:10217/232470 2023-06-11T04:13:54+02:00 Evidence for a rotation in asthenospheric flow in northwest Canada: insights from shear wave splitting Bolton, Andrew R. Schutt, Derek L. Aster, Richard C. Briedt, F. Jay 2021-06-07T10:19:35Z born digital masters theses application/pdf https://hdl.handle.net/10217/232470 English eng eng Colorado State University. Libraries 2020- CSU Theses and Dissertations Bolton_colostate_0053N_16411.pdf https://hdl.handle.net/10217/232470 Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright. northwest Canada shear wave splitting seismology mantle anisotropy Text 2021 ftcolostateunidc 2023-05-04T17:37:13Z 2021 Spring. Includes bibliographical references. The Mackenzie Mountains (MM) of northwest Canada are an actively uplifting, seismogenic salient of the northern Canadian Cordillera that lie 750 km NE of the nearest plate boundary. We present new shear wave splitting measurements for the region from a linear array which transects the region to characterize upper mantle anisotropy. A gradual rotation in anisotropy occurs across the Canadian Cordillera, with stations nearest to the craton yielding fast axis orientations that are subparallel to North America absolute plate motion (~230°). Moving SW from the craton, across the MM and towards the plate boundary, fast-axis orientations rotate to become aligned with major lithospheric fabrics (NW-SE). Previous work has shown that the Cordilleran lithosphere is thin (~50 km) in this region. We therefore interpret these results to primarily reflect sublithospheric flow. Three subduction-transpressional related hypotheses for flow are presented, where our preferred hypotheses invokes depth-dependent, subduction-induced flow. Text Mackenzie mountains Digital Collections of Colorado (Colorado State University) Canada |
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Open Polar |
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Digital Collections of Colorado (Colorado State University) |
op_collection_id |
ftcolostateunidc |
language |
English |
topic |
northwest Canada shear wave splitting seismology mantle anisotropy |
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northwest Canada shear wave splitting seismology mantle anisotropy Bolton, Andrew R. Evidence for a rotation in asthenospheric flow in northwest Canada: insights from shear wave splitting |
topic_facet |
northwest Canada shear wave splitting seismology mantle anisotropy |
description |
2021 Spring. Includes bibliographical references. The Mackenzie Mountains (MM) of northwest Canada are an actively uplifting, seismogenic salient of the northern Canadian Cordillera that lie 750 km NE of the nearest plate boundary. We present new shear wave splitting measurements for the region from a linear array which transects the region to characterize upper mantle anisotropy. A gradual rotation in anisotropy occurs across the Canadian Cordillera, with stations nearest to the craton yielding fast axis orientations that are subparallel to North America absolute plate motion (~230°). Moving SW from the craton, across the MM and towards the plate boundary, fast-axis orientations rotate to become aligned with major lithospheric fabrics (NW-SE). Previous work has shown that the Cordilleran lithosphere is thin (~50 km) in this region. We therefore interpret these results to primarily reflect sublithospheric flow. Three subduction-transpressional related hypotheses for flow are presented, where our preferred hypotheses invokes depth-dependent, subduction-induced flow. |
author2 |
Schutt, Derek L. Aster, Richard C. Briedt, F. Jay |
format |
Text |
author |
Bolton, Andrew R. |
author_facet |
Bolton, Andrew R. |
author_sort |
Bolton, Andrew R. |
title |
Evidence for a rotation in asthenospheric flow in northwest Canada: insights from shear wave splitting |
title_short |
Evidence for a rotation in asthenospheric flow in northwest Canada: insights from shear wave splitting |
title_full |
Evidence for a rotation in asthenospheric flow in northwest Canada: insights from shear wave splitting |
title_fullStr |
Evidence for a rotation in asthenospheric flow in northwest Canada: insights from shear wave splitting |
title_full_unstemmed |
Evidence for a rotation in asthenospheric flow in northwest Canada: insights from shear wave splitting |
title_sort |
evidence for a rotation in asthenospheric flow in northwest canada: insights from shear wave splitting |
publisher |
Colorado State University. Libraries |
publishDate |
2021 |
url |
https://hdl.handle.net/10217/232470 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Mackenzie mountains |
genre_facet |
Mackenzie mountains |
op_relation |
2020- CSU Theses and Dissertations Bolton_colostate_0053N_16411.pdf https://hdl.handle.net/10217/232470 |
op_rights |
Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright. |
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