Controls of Flat Slab Versus Oceanic Plateau Subduction on Overriding Plate Deformation in south-central Alaska
Ph.D. Two plates converge at oceanic trenches with the expected result that the denser plate descends into the upper mantle beneath the less dense plate in a process known as subduction. However, when anomalously thick oceanic material, such as an oceanic plateau, begins subduction, the exact nature...
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ftunivbuffalo:oai:ubir.buffalo.edu:10477/80848 2023-05-15T18:44:39+02:00 Controls of Flat Slab Versus Oceanic Plateau Subduction on Overriding Plate Deformation in south-central Alaska Haynie, Kirstie orcid:0000-0001-9930-6736 Jadamec, Margarete Geology 2019-08-07 15:08:44 application/pdf http://hdl.handle.net/10477/80848 en eng State University of New York at Buffalo http://hdl.handle.net/10477/80848 Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions. Copyright retained by author. Geophysics Geology Dissertation Text 2019 ftunivbuffalo 2022-02-20T06:33:18Z Ph.D. Two plates converge at oceanic trenches with the expected result that the denser plate descends into the upper mantle beneath the less dense plate in a process known as subduction. However, when anomalously thick oceanic material, such as an oceanic plateau, begins subduction, the exact nature of how the oceanic plateau affects the subducting slab and upper plate is not well understood. If the oceanic plateau is positively buoyant it will tend to resist subduction which may cause a reduction in subducting plate speed; in some cases, slab break-off followed by accretion of the plateau to the upper plate or a reversal in subduction polarity. Depending on the subduction system, plateau dimensions and density structure, oceanic plateaus can subduct, which may lead to changes in slab morphology, changes in plate motion, and may drive far-field deformation in the overriding plate. The convergent margin in south-central Alaska is marked by oblique flat slab subduction of the Pacific plate and Yakutat oceanic plateau beneath the overriding Wrangell block forearc sliver and the North American plate. Both flat slab subduction of young seafloor and subduction of an oceanic plateau can cause an overall increase in slab buoyancy that may lead to an increase in coupling to the base of the overriding plate and significant upper plate deformation. Doctoral or Postdoctoral Thesis Yakutat Alaska UBIR Repository (University at Buffalo Institutional Repository) Pacific |
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Open Polar |
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UBIR Repository (University at Buffalo Institutional Repository) |
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ftunivbuffalo |
language |
English |
topic |
Geophysics Geology |
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Geophysics Geology Haynie, Kirstie orcid:0000-0001-9930-6736 Controls of Flat Slab Versus Oceanic Plateau Subduction on Overriding Plate Deformation in south-central Alaska |
topic_facet |
Geophysics Geology |
description |
Ph.D. Two plates converge at oceanic trenches with the expected result that the denser plate descends into the upper mantle beneath the less dense plate in a process known as subduction. However, when anomalously thick oceanic material, such as an oceanic plateau, begins subduction, the exact nature of how the oceanic plateau affects the subducting slab and upper plate is not well understood. If the oceanic plateau is positively buoyant it will tend to resist subduction which may cause a reduction in subducting plate speed; in some cases, slab break-off followed by accretion of the plateau to the upper plate or a reversal in subduction polarity. Depending on the subduction system, plateau dimensions and density structure, oceanic plateaus can subduct, which may lead to changes in slab morphology, changes in plate motion, and may drive far-field deformation in the overriding plate. The convergent margin in south-central Alaska is marked by oblique flat slab subduction of the Pacific plate and Yakutat oceanic plateau beneath the overriding Wrangell block forearc sliver and the North American plate. Both flat slab subduction of young seafloor and subduction of an oceanic plateau can cause an overall increase in slab buoyancy that may lead to an increase in coupling to the base of the overriding plate and significant upper plate deformation. |
author2 |
Jadamec, Margarete Geology |
format |
Doctoral or Postdoctoral Thesis |
author |
Haynie, Kirstie orcid:0000-0001-9930-6736 |
author_facet |
Haynie, Kirstie orcid:0000-0001-9930-6736 |
author_sort |
Haynie, Kirstie |
title |
Controls of Flat Slab Versus Oceanic Plateau Subduction on Overriding Plate Deformation in south-central Alaska |
title_short |
Controls of Flat Slab Versus Oceanic Plateau Subduction on Overriding Plate Deformation in south-central Alaska |
title_full |
Controls of Flat Slab Versus Oceanic Plateau Subduction on Overriding Plate Deformation in south-central Alaska |
title_fullStr |
Controls of Flat Slab Versus Oceanic Plateau Subduction on Overriding Plate Deformation in south-central Alaska |
title_full_unstemmed |
Controls of Flat Slab Versus Oceanic Plateau Subduction on Overriding Plate Deformation in south-central Alaska |
title_sort |
controls of flat slab versus oceanic plateau subduction on overriding plate deformation in south-central alaska |
publisher |
State University of New York at Buffalo |
publishDate |
2019 |
url |
http://hdl.handle.net/10477/80848 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Yakutat Alaska |
genre_facet |
Yakutat Alaska |
op_relation |
http://hdl.handle.net/10477/80848 |
op_rights |
Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions. Copyright retained by author. |
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