The Role of Cenozoic Oceanic Plateau Collision in the Tectonic Growth of Western North America
This dissertation uses a multidisciplinary basin analysis approach to document the sedimentary, structural, and volcanic response to Cenozoic oceanic plateau collision and translation along the northwestern Cordillera. During this time, two fragments of oceanic plateau accreted in the Pacific Northw...
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ftpurdueunivport:oai:figshare.com:article/25601208 2024-05-12T08:12:20+00:00 The Role of Cenozoic Oceanic Plateau Collision in the Tectonic Growth of Western North America Erin Elizabeth Donaghy 2024-04-15T15:56:19Z https://doi.org/10.25394/pgs.25601208.v1 unknown https://figshare.com/articles/thesis/The_Role_of_Cenozoic_Oceanic_Plateau_Collision_in_the_Tectonic_Growth_of_Western_North_America/25601208 doi:10.25394/pgs.25601208.v1 CC BY 4.0 Geochronology Sedimentology Stratigraphy (incl. biostratigraphy sequence stratigraphy and basin analysis) Structural geology and tectonics Olympic Peninsula oceanic plateau Siletzia U-Pb geochronology Basin analysis Text Thesis 2024 ftpurdueunivport https://doi.org/10.25394/pgs.25601208.v1 2024-04-16T00:38:56Z This dissertation uses a multidisciplinary basin analysis approach to document the sedimentary, structural, and volcanic response to Cenozoic oceanic plateau collision and translation along the northwestern Cordillera. During this time, two fragments of oceanic plateau accreted in the Pacific Northwest (Siletzia terrane) and in southeastern Alaska (Yakutat terrane). My research aims to test if the Siletzia and Yakutat terranes have an early shared history as the same spreading ridge-centered plateau in the Pacific Northwest and constrain timing of breakup and translation of the Yakutat terrane to southeastern Alaska. Chapter 2 focuses on development of a new U-Pb zircon geochronology technique to aid in a more accurate and precise understanding of sediment routing systems. The goal of developing this technique is to utilize it in pinpointing the source regions along the northwestern Cordillera supplying sediment to the basin on the Yakutat terrane as it made its northward journey to southeastern Alaska. Chapter 3 focuses on creating a regional chronostratigraphy for deep-marine Cenozoic sedimentary and volcanic rocks of the peripheral rock sequence on the northern Olympic Peninsula in Washington. These sedimentary rocks directly overlie the Siletzia plateau and record basin evolution before, during, and following its collision to the continental margin. Chapter 4 uses detailed lithofacies mapping and U-Pb geochronology of metasedimentary and volcanic rocks in the Olympic subduction complex to document the structural response to seamount subduction in the Eocene. Seamount subduction began shortly after collision of the Siletzia oceanic plateau to the Pacific Northwest and played a critical role in development of the early forearc region and Ancestral Cascades arc. Chapter 5 compares the lowermost sedimentary and geochronologic basin record on both Siletzia and Yakutat terranes to test if they have an early shared history in the Pacific Northwest. Thesis Yakutat Alaska Purdue University Graduate School: Figshare Pacific |
institution |
Open Polar |
collection |
Purdue University Graduate School: Figshare |
op_collection_id |
ftpurdueunivport |
language |
unknown |
topic |
Geochronology Sedimentology Stratigraphy (incl. biostratigraphy sequence stratigraphy and basin analysis) Structural geology and tectonics Olympic Peninsula oceanic plateau Siletzia U-Pb geochronology Basin analysis |
spellingShingle |
Geochronology Sedimentology Stratigraphy (incl. biostratigraphy sequence stratigraphy and basin analysis) Structural geology and tectonics Olympic Peninsula oceanic plateau Siletzia U-Pb geochronology Basin analysis Erin Elizabeth Donaghy The Role of Cenozoic Oceanic Plateau Collision in the Tectonic Growth of Western North America |
topic_facet |
Geochronology Sedimentology Stratigraphy (incl. biostratigraphy sequence stratigraphy and basin analysis) Structural geology and tectonics Olympic Peninsula oceanic plateau Siletzia U-Pb geochronology Basin analysis |
description |
This dissertation uses a multidisciplinary basin analysis approach to document the sedimentary, structural, and volcanic response to Cenozoic oceanic plateau collision and translation along the northwestern Cordillera. During this time, two fragments of oceanic plateau accreted in the Pacific Northwest (Siletzia terrane) and in southeastern Alaska (Yakutat terrane). My research aims to test if the Siletzia and Yakutat terranes have an early shared history as the same spreading ridge-centered plateau in the Pacific Northwest and constrain timing of breakup and translation of the Yakutat terrane to southeastern Alaska. Chapter 2 focuses on development of a new U-Pb zircon geochronology technique to aid in a more accurate and precise understanding of sediment routing systems. The goal of developing this technique is to utilize it in pinpointing the source regions along the northwestern Cordillera supplying sediment to the basin on the Yakutat terrane as it made its northward journey to southeastern Alaska. Chapter 3 focuses on creating a regional chronostratigraphy for deep-marine Cenozoic sedimentary and volcanic rocks of the peripheral rock sequence on the northern Olympic Peninsula in Washington. These sedimentary rocks directly overlie the Siletzia plateau and record basin evolution before, during, and following its collision to the continental margin. Chapter 4 uses detailed lithofacies mapping and U-Pb geochronology of metasedimentary and volcanic rocks in the Olympic subduction complex to document the structural response to seamount subduction in the Eocene. Seamount subduction began shortly after collision of the Siletzia oceanic plateau to the Pacific Northwest and played a critical role in development of the early forearc region and Ancestral Cascades arc. Chapter 5 compares the lowermost sedimentary and geochronologic basin record on both Siletzia and Yakutat terranes to test if they have an early shared history in the Pacific Northwest. |
format |
Thesis |
author |
Erin Elizabeth Donaghy |
author_facet |
Erin Elizabeth Donaghy |
author_sort |
Erin Elizabeth Donaghy |
title |
The Role of Cenozoic Oceanic Plateau Collision in the Tectonic Growth of Western North America |
title_short |
The Role of Cenozoic Oceanic Plateau Collision in the Tectonic Growth of Western North America |
title_full |
The Role of Cenozoic Oceanic Plateau Collision in the Tectonic Growth of Western North America |
title_fullStr |
The Role of Cenozoic Oceanic Plateau Collision in the Tectonic Growth of Western North America |
title_full_unstemmed |
The Role of Cenozoic Oceanic Plateau Collision in the Tectonic Growth of Western North America |
title_sort |
role of cenozoic oceanic plateau collision in the tectonic growth of western north america |
publishDate |
2024 |
url |
https://doi.org/10.25394/pgs.25601208.v1 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Yakutat Alaska |
genre_facet |
Yakutat Alaska |
op_relation |
https://figshare.com/articles/thesis/The_Role_of_Cenozoic_Oceanic_Plateau_Collision_in_the_Tectonic_Growth_of_Western_North_America/25601208 doi:10.25394/pgs.25601208.v1 |
op_rights |
CC BY 4.0 |
op_doi |
https://doi.org/10.25394/pgs.25601208.v1 |
_version_ |
1798834673194893312 |