Stratigraphic and Structural Framework for Denali National Park and Preserve, central Alaska Range: Implications of Upper Paleozoic-Cretaceous Stratigraphy for Mesozoic Tectonics and Paleogeography
Paleozoic-Mesozoic stratigraphy exposed in the central Alaska Range includes a diverse assemblage of tectonostratigraphic basement terranes overprinted by late Mesozoic basin formation and Cenozoic strike-slip displacement. In this thesis, I present a stratigraphic and structural framework for upper...
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ftpurdueunivport:oai:figshare.com:article/13266563 2023-05-15T13:09:37+02:00 Stratigraphic and Structural Framework for Denali National Park and Preserve, central Alaska Range: Implications of Upper Paleozoic-Cretaceous Stratigraphy for Mesozoic Tectonics and Paleogeography Brandon M Keough 2020-12-16T02:37:52Z https://doi.org/10.25394/pgs.13266563.v1 unknown https://figshare.com/articles/thesis/Stratigraphic_and_Structural_Framework_for_Denali_National_Park_and_Preserve_central_Alaska_Range_Implications_of_Upper_Paleozoic-Cretaceous_Stratigraphy_for_Mesozoic_Tectonics_and_Paleogeography/13266563 doi:10.25394/pgs.13266563.v1 CC BY 4.0 CC-BY Sedimentology Stratigraphy (incl. biostratigraphy sequence stratigraphy and basin analysis) Structural geology and tectonics Geology not elsewhere classified Alaska Stratigraphy Tectonics Farewell terrane Cantwell Formation Geology Stratigraphy (incl. Biostratigraphy and Sequence Stratigraphy) Structural Geology Text Thesis 2020 ftpurdueunivport https://doi.org/10.25394/pgs.13266563.v1 2023-01-18T13:26:38Z Paleozoic-Mesozoic stratigraphy exposed in the central Alaska Range includes a diverse assemblage of tectonostratigraphic basement terranes overprinted by late Mesozoic basin formation and Cenozoic strike-slip displacement. In this thesis, I present a stratigraphic and structural framework for upper Paleozoic-Cretaceous strata exposed in Denali National Park and Preserve. The stratigraphic architecture of the study area is characterized by two distinct Upper Paleozoic-Mesozoic stratigraphic packages that are unconformably overlain by the Upper Cretaceous Cantwell Formation. Sedimentological, provenance, and geologic mapping data suggest that one basement assemblage, the Northern package, consists of Upper Triassic-Lower Cretaceous submarine strata deposited along the northwestern Laurentian margin. The other assemblage, termed the Southern package, is exotic to the ancestral continental margin and is associated with Permian-Upper Triassic submarine strata of the Farewell terrane. Provenance data from this package place new constraints on the Late Paleozoic paleogeographic position of the Farewell terrane prior to its accretion to the continental margin, likely by the Late Jurassic. The results of geologic mapping along the Toklat River corridor show that the Northern and Southern packages are deformed and structurally juxtaposed within a triangle zone bounded by the Hines Creek and Denali fault systems. This is the best exposure of stratigraphy associated with the Farewell terrane juxtaposed with strata representative of the ancestral continental margin known to date. New 1:24,000-scale geologic mapping coupled with a stratigraphic and provenance analysis of the Cantwell Formation provides new insights into sedimentation and deformation during the post-collisional phase of development of the Alaska Range suture zone (ARSZ). Results of this study define three stages of basin development. These stages are represented by alluvialfluvial, tidally influenced fluvial, and marginal marine deposits, respectively. ... Thesis alaska range Alaska Purdue University Graduate School: Figshare Hines ENVELOPE(13.035,13.035,66.243,66.243) Hines Creek ENVELOPE(-118.619,-118.619,55.917,55.917) |
institution |
Open Polar |
collection |
Purdue University Graduate School: Figshare |
op_collection_id |
ftpurdueunivport |
language |
unknown |
topic |
Sedimentology Stratigraphy (incl. biostratigraphy sequence stratigraphy and basin analysis) Structural geology and tectonics Geology not elsewhere classified Alaska Stratigraphy Tectonics Farewell terrane Cantwell Formation Geology Stratigraphy (incl. Biostratigraphy and Sequence Stratigraphy) Structural Geology |
spellingShingle |
Sedimentology Stratigraphy (incl. biostratigraphy sequence stratigraphy and basin analysis) Structural geology and tectonics Geology not elsewhere classified Alaska Stratigraphy Tectonics Farewell terrane Cantwell Formation Geology Stratigraphy (incl. Biostratigraphy and Sequence Stratigraphy) Structural Geology Brandon M Keough Stratigraphic and Structural Framework for Denali National Park and Preserve, central Alaska Range: Implications of Upper Paleozoic-Cretaceous Stratigraphy for Mesozoic Tectonics and Paleogeography |
topic_facet |
Sedimentology Stratigraphy (incl. biostratigraphy sequence stratigraphy and basin analysis) Structural geology and tectonics Geology not elsewhere classified Alaska Stratigraphy Tectonics Farewell terrane Cantwell Formation Geology Stratigraphy (incl. Biostratigraphy and Sequence Stratigraphy) Structural Geology |
description |
Paleozoic-Mesozoic stratigraphy exposed in the central Alaska Range includes a diverse assemblage of tectonostratigraphic basement terranes overprinted by late Mesozoic basin formation and Cenozoic strike-slip displacement. In this thesis, I present a stratigraphic and structural framework for upper Paleozoic-Cretaceous strata exposed in Denali National Park and Preserve. The stratigraphic architecture of the study area is characterized by two distinct Upper Paleozoic-Mesozoic stratigraphic packages that are unconformably overlain by the Upper Cretaceous Cantwell Formation. Sedimentological, provenance, and geologic mapping data suggest that one basement assemblage, the Northern package, consists of Upper Triassic-Lower Cretaceous submarine strata deposited along the northwestern Laurentian margin. The other assemblage, termed the Southern package, is exotic to the ancestral continental margin and is associated with Permian-Upper Triassic submarine strata of the Farewell terrane. Provenance data from this package place new constraints on the Late Paleozoic paleogeographic position of the Farewell terrane prior to its accretion to the continental margin, likely by the Late Jurassic. The results of geologic mapping along the Toklat River corridor show that the Northern and Southern packages are deformed and structurally juxtaposed within a triangle zone bounded by the Hines Creek and Denali fault systems. This is the best exposure of stratigraphy associated with the Farewell terrane juxtaposed with strata representative of the ancestral continental margin known to date. New 1:24,000-scale geologic mapping coupled with a stratigraphic and provenance analysis of the Cantwell Formation provides new insights into sedimentation and deformation during the post-collisional phase of development of the Alaska Range suture zone (ARSZ). Results of this study define three stages of basin development. These stages are represented by alluvialfluvial, tidally influenced fluvial, and marginal marine deposits, respectively. ... |
format |
Thesis |
author |
Brandon M Keough |
author_facet |
Brandon M Keough |
author_sort |
Brandon M Keough |
title |
Stratigraphic and Structural Framework for Denali National Park and Preserve, central Alaska Range: Implications of Upper Paleozoic-Cretaceous Stratigraphy for Mesozoic Tectonics and Paleogeography |
title_short |
Stratigraphic and Structural Framework for Denali National Park and Preserve, central Alaska Range: Implications of Upper Paleozoic-Cretaceous Stratigraphy for Mesozoic Tectonics and Paleogeography |
title_full |
Stratigraphic and Structural Framework for Denali National Park and Preserve, central Alaska Range: Implications of Upper Paleozoic-Cretaceous Stratigraphy for Mesozoic Tectonics and Paleogeography |
title_fullStr |
Stratigraphic and Structural Framework for Denali National Park and Preserve, central Alaska Range: Implications of Upper Paleozoic-Cretaceous Stratigraphy for Mesozoic Tectonics and Paleogeography |
title_full_unstemmed |
Stratigraphic and Structural Framework for Denali National Park and Preserve, central Alaska Range: Implications of Upper Paleozoic-Cretaceous Stratigraphy for Mesozoic Tectonics and Paleogeography |
title_sort |
stratigraphic and structural framework for denali national park and preserve, central alaska range: implications of upper paleozoic-cretaceous stratigraphy for mesozoic tectonics and paleogeography |
publishDate |
2020 |
url |
https://doi.org/10.25394/pgs.13266563.v1 |
long_lat |
ENVELOPE(13.035,13.035,66.243,66.243) ENVELOPE(-118.619,-118.619,55.917,55.917) |
geographic |
Hines Hines Creek |
geographic_facet |
Hines Hines Creek |
genre |
alaska range Alaska |
genre_facet |
alaska range Alaska |
op_relation |
https://figshare.com/articles/thesis/Stratigraphic_and_Structural_Framework_for_Denali_National_Park_and_Preserve_central_Alaska_Range_Implications_of_Upper_Paleozoic-Cretaceous_Stratigraphy_for_Mesozoic_Tectonics_and_Paleogeography/13266563 doi:10.25394/pgs.13266563.v1 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.25394/pgs.13266563.v1 |
_version_ |
1766190338439905280 |