Three-Dimensional Mechanics of Yakutat Convergence in the Southern Alaskan Plate Corner
Three-dimensional numerical models are used to investigate the mechanical evolution of the southern Alaskan plate corner where the Yakutat and the Pacific plates converge on the North American plate. The evolving model plate boundary consists of Convergent, Lateral, and Subduction subboundaries with...
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ftmaineuniv:oai:digitalcommons.library.umaine.edu:ers_facpub-1112 2024-09-09T18:55:56+00:00 Three-Dimensional Mechanics of Yakutat Convergence in the Southern Alaskan Plate Corner Koons, Peter O. Hooks, B. P. Pavlis, T. Upton, P. Barker, A. D. 2010-07-22T07:00:00Z application/pdf https://digitalcommons.library.umaine.edu/ers_facpub/113 https://doi.org/10.1029/2009TC002463 https://digitalcommons.library.umaine.edu/context/ers_facpub/article/1112/viewcontent/koons_29_TC4008.pdf unknown DigitalCommons@UMaine https://digitalcommons.library.umaine.edu/ers_facpub/113 doi:10.1029/2009TC002463 https://digitalcommons.library.umaine.edu/context/ers_facpub/article/1112/viewcontent/koons_29_TC4008.pdf This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. In addition, no permission is required from the rights-holder(s) for educational uses. For other uses, you need to obtain permission from the rights-holder(s). Earth Science Faculty Scholarship Earth Sciences text 2010 ftmaineuniv https://doi.org/10.1029/2009TC002463 2024-07-24T05:38:40Z Three-dimensional numerical models are used to investigate the mechanical evolution of the southern Alaskan plate corner where the Yakutat and the Pacific plates converge on the North American plate. The evolving model plate boundary consists of Convergent, Lateral, and Subduction subboundaries with flow separation of incoming material into upward or downward trajectories forming dual, nonlinear advective thermal/mechanical anomalies that fix the position of major subaerial mountain belts. The model convergent subboundary evolves into two teleconnected orogens: Inlet and Outlet orogens form at locations that correspond with the St. Elias and the Central Alaska Range, respectively, linked to the East by the Lateral boundary. Basins form parallel to the orogens in response to the downward component of velocity associated with subduction. Strain along the Lateral subboundary varies as a function of orogen rheology and magnitude and distribution of erosion. Strain-dependent shear resistance of the plate boundary associated with the shallow subduction zone controls the position of the Inlet orogen. The linkages among these plate boundaries display maximum shear strain rates in the horizontal and vertical planes where the Lateral subboundary joins the Inlet and Outlet orogens. The location of the strain maxima shifts with time as the separation of the Inlet and Outlet orogens increases. The spatiotemporal predictions of the model are consistent with observed exhumation histories deduced from thermochronology, as well as stratigraphic studies of synorogenic deposits. In addition, the complex structural evolution of the St Elias region is broadly consistent with the predicted strain field evolution. Citation: Koons, P. O., B. P. Hooks, T. Pavlis, P. Upton, and A. D. Barker (2010), Three-dimensional mechanics of Yakutat convergence in the southern Alaskan plate corner, Tectonics, 29, TC4008, doi:10.1029/2009TC002463. Text alaska range Yakutat Alaska The University of Maine: DigitalCommons@UMaine Koons ENVELOPE(160.367,160.367,-72.717,-72.717) Pacific Tectonics 29 4 n/a n/a |
institution |
Open Polar |
collection |
The University of Maine: DigitalCommons@UMaine |
op_collection_id |
ftmaineuniv |
language |
unknown |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Koons, Peter O. Hooks, B. P. Pavlis, T. Upton, P. Barker, A. D. Three-Dimensional Mechanics of Yakutat Convergence in the Southern Alaskan Plate Corner |
topic_facet |
Earth Sciences |
description |
Three-dimensional numerical models are used to investigate the mechanical evolution of the southern Alaskan plate corner where the Yakutat and the Pacific plates converge on the North American plate. The evolving model plate boundary consists of Convergent, Lateral, and Subduction subboundaries with flow separation of incoming material into upward or downward trajectories forming dual, nonlinear advective thermal/mechanical anomalies that fix the position of major subaerial mountain belts. The model convergent subboundary evolves into two teleconnected orogens: Inlet and Outlet orogens form at locations that correspond with the St. Elias and the Central Alaska Range, respectively, linked to the East by the Lateral boundary. Basins form parallel to the orogens in response to the downward component of velocity associated with subduction. Strain along the Lateral subboundary varies as a function of orogen rheology and magnitude and distribution of erosion. Strain-dependent shear resistance of the plate boundary associated with the shallow subduction zone controls the position of the Inlet orogen. The linkages among these plate boundaries display maximum shear strain rates in the horizontal and vertical planes where the Lateral subboundary joins the Inlet and Outlet orogens. The location of the strain maxima shifts with time as the separation of the Inlet and Outlet orogens increases. The spatiotemporal predictions of the model are consistent with observed exhumation histories deduced from thermochronology, as well as stratigraphic studies of synorogenic deposits. In addition, the complex structural evolution of the St Elias region is broadly consistent with the predicted strain field evolution. Citation: Koons, P. O., B. P. Hooks, T. Pavlis, P. Upton, and A. D. Barker (2010), Three-dimensional mechanics of Yakutat convergence in the southern Alaskan plate corner, Tectonics, 29, TC4008, doi:10.1029/2009TC002463. |
format |
Text |
author |
Koons, Peter O. Hooks, B. P. Pavlis, T. Upton, P. Barker, A. D. |
author_facet |
Koons, Peter O. Hooks, B. P. Pavlis, T. Upton, P. Barker, A. D. |
author_sort |
Koons, Peter O. |
title |
Three-Dimensional Mechanics of Yakutat Convergence in the Southern Alaskan Plate Corner |
title_short |
Three-Dimensional Mechanics of Yakutat Convergence in the Southern Alaskan Plate Corner |
title_full |
Three-Dimensional Mechanics of Yakutat Convergence in the Southern Alaskan Plate Corner |
title_fullStr |
Three-Dimensional Mechanics of Yakutat Convergence in the Southern Alaskan Plate Corner |
title_full_unstemmed |
Three-Dimensional Mechanics of Yakutat Convergence in the Southern Alaskan Plate Corner |
title_sort |
three-dimensional mechanics of yakutat convergence in the southern alaskan plate corner |
publisher |
DigitalCommons@UMaine |
publishDate |
2010 |
url |
https://digitalcommons.library.umaine.edu/ers_facpub/113 https://doi.org/10.1029/2009TC002463 https://digitalcommons.library.umaine.edu/context/ers_facpub/article/1112/viewcontent/koons_29_TC4008.pdf |
long_lat |
ENVELOPE(160.367,160.367,-72.717,-72.717) |
geographic |
Koons Pacific |
geographic_facet |
Koons Pacific |
genre |
alaska range Yakutat Alaska |
genre_facet |
alaska range Yakutat Alaska |
op_source |
Earth Science Faculty Scholarship |
op_relation |
https://digitalcommons.library.umaine.edu/ers_facpub/113 doi:10.1029/2009TC002463 https://digitalcommons.library.umaine.edu/context/ers_facpub/article/1112/viewcontent/koons_29_TC4008.pdf |
op_rights |
This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. In addition, no permission is required from the rights-holder(s) for educational uses. For other uses, you need to obtain permission from the rights-holder(s). |
op_doi |
https://doi.org/10.1029/2009TC002463 |
container_title |
Tectonics |
container_volume |
29 |
container_issue |
4 |
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n/a |
op_container_end_page |
n/a |
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1809930231657529344 |