Geophysical Characterization of the Central Yakutat Shelf and Cenozoic Basin Development, Offshore Southeastern Alaska
In southeastern Alaska, the collision of the Yakutat microplate with North America has led to uplift of the highest costal mountain range in the world, the Chugach and St. Elias Mountains. Once uplift of the ranges produced sufficient topography to intercept precipitation sourced from the Gulf of Al...
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ftunvnewmexicoir:oai:digitalrepository.unm.edu:eps_etds-1107 2023-05-15T16:20:34+02:00 Geophysical Characterization of the Central Yakutat Shelf and Cenozoic Basin Development, Offshore Southeastern Alaska Price, Rachel 2016-07-01T07:00:00Z application/pdf https://digitalrepository.unm.edu/eps_etds/107 https://digitalrepository.unm.edu/cgi/viewcontent.cgi?article=1107&context=eps_etds English eng UNM Digital Repository https://digitalrepository.unm.edu/eps_etds/107 https://digitalrepository.unm.edu/cgi/viewcontent.cgi?article=1107&context=eps_etds Earth and Planetary Sciences ETDs Geophysics Alaska Yakutat basin development text 2016 ftunvnewmexicoir 2023-02-02T22:40:00Z In southeastern Alaska, the collision of the Yakutat microplate with North America has led to uplift of the highest costal mountain range in the world, the Chugach and St. Elias Mountains. Once uplift of the ranges produced sufficient topography to intercept precipitation sourced from the Gulf of Alaska, glaciation on the margin was initiated. The margin now presents a unique area to study the interactions between tectonics and climate driven processes. The area of maximum uplift and exhumation is termed the southeastern Alaskan syntaxis, and is characterized by complicated patterns of deformation and sedimentation in an offshore basin. This study presents a two dimensional compressional velocity model that helps to constrain patterns of deformation offshore of the syntaxis. The velocity model is also interpreted in conjunction with a coincident seismic reflection line in order to characterize Cenozoic sediment packages at depth and better understand the evolution of a tectonically active glaciated margin. The study is able to constrain the front of lateral compaction due to porosity loss to a narrow band between the Malaspina Fault and Yakutat Bay, as well as the offshore location of the pinch out of the Poul Creek Formation. Interpretation of the seismic reflection line reveals transitions in sediment depositional processes, depocenters, and sources in the central Yakutat shelf over time, particularly the transition to the Malaspina Glacier as the major sediment source in the area. Text glacier Yakutat Alaska UNM Digital Repository (The University of New Mexico) Gulf of Alaska |
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Open Polar |
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UNM Digital Repository (The University of New Mexico) |
op_collection_id |
ftunvnewmexicoir |
language |
English |
topic |
Geophysics Alaska Yakutat basin development |
spellingShingle |
Geophysics Alaska Yakutat basin development Price, Rachel Geophysical Characterization of the Central Yakutat Shelf and Cenozoic Basin Development, Offshore Southeastern Alaska |
topic_facet |
Geophysics Alaska Yakutat basin development |
description |
In southeastern Alaska, the collision of the Yakutat microplate with North America has led to uplift of the highest costal mountain range in the world, the Chugach and St. Elias Mountains. Once uplift of the ranges produced sufficient topography to intercept precipitation sourced from the Gulf of Alaska, glaciation on the margin was initiated. The margin now presents a unique area to study the interactions between tectonics and climate driven processes. The area of maximum uplift and exhumation is termed the southeastern Alaskan syntaxis, and is characterized by complicated patterns of deformation and sedimentation in an offshore basin. This study presents a two dimensional compressional velocity model that helps to constrain patterns of deformation offshore of the syntaxis. The velocity model is also interpreted in conjunction with a coincident seismic reflection line in order to characterize Cenozoic sediment packages at depth and better understand the evolution of a tectonically active glaciated margin. The study is able to constrain the front of lateral compaction due to porosity loss to a narrow band between the Malaspina Fault and Yakutat Bay, as well as the offshore location of the pinch out of the Poul Creek Formation. Interpretation of the seismic reflection line reveals transitions in sediment depositional processes, depocenters, and sources in the central Yakutat shelf over time, particularly the transition to the Malaspina Glacier as the major sediment source in the area. |
format |
Text |
author |
Price, Rachel |
author_facet |
Price, Rachel |
author_sort |
Price, Rachel |
title |
Geophysical Characterization of the Central Yakutat Shelf and Cenozoic Basin Development, Offshore Southeastern Alaska |
title_short |
Geophysical Characterization of the Central Yakutat Shelf and Cenozoic Basin Development, Offshore Southeastern Alaska |
title_full |
Geophysical Characterization of the Central Yakutat Shelf and Cenozoic Basin Development, Offshore Southeastern Alaska |
title_fullStr |
Geophysical Characterization of the Central Yakutat Shelf and Cenozoic Basin Development, Offshore Southeastern Alaska |
title_full_unstemmed |
Geophysical Characterization of the Central Yakutat Shelf and Cenozoic Basin Development, Offshore Southeastern Alaska |
title_sort |
geophysical characterization of the central yakutat shelf and cenozoic basin development, offshore southeastern alaska |
publisher |
UNM Digital Repository |
publishDate |
2016 |
url |
https://digitalrepository.unm.edu/eps_etds/107 https://digitalrepository.unm.edu/cgi/viewcontent.cgi?article=1107&context=eps_etds |
geographic |
Gulf of Alaska |
geographic_facet |
Gulf of Alaska |
genre |
glacier Yakutat Alaska |
genre_facet |
glacier Yakutat Alaska |
op_source |
Earth and Planetary Sciences ETDs |
op_relation |
https://digitalrepository.unm.edu/eps_etds/107 https://digitalrepository.unm.edu/cgi/viewcontent.cgi?article=1107&context=eps_etds |
_version_ |
1766008492443828224 |