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 basinformation and Cenozoic strike-slip displacement. In this thesis, I present a stratigraphic and structural framework for upper...
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Purdue University Graduate School
2020
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ftdatacite:10.25394/pgs.13266563 2023-05-15T13:09:38+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 Keough, Brandon M 2020 https://dx.doi.org/10.25394/pgs.13266563 https://hammer.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 unknown Purdue University Graduate School Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY 40310 Sedimentology FOS Earth and related environmental sciences Geology 40311 Stratigraphy incl. Biostratigraphy and Sequence Stratigraphy 40312 Structural Geology 40313 Tectonics Text Thesis article-journal ScholarlyArticle 2020 ftdatacite https://doi.org/10.25394/pgs.13266563 2021-11-05T12:55:41Z Paleozoic-Mesozoic stratigraphy exposed in the central Alaska Range includes a diverse assemblage of tectonostratigraphic basement terranes overprinted by late Mesozoic basinformation 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. Results of geologic mapping record progressive Late Cretaceous-Eocene deformation of the Cantwell Formation in a triangle zone and the transition from compressional to strike-slip tectonics in the Eocene. This deformation coincides with regional exhumation of the ARSZ and reconfiguration of the paleosouthern Alaskan margin with the establishment of the modern convergent margin configuration. Thesis alaska range Alaska DataCite Metadata Store (German National Library of Science and Technology) 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 |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
40310 Sedimentology FOS Earth and related environmental sciences Geology 40311 Stratigraphy incl. Biostratigraphy and Sequence Stratigraphy 40312 Structural Geology 40313 Tectonics |
spellingShingle |
40310 Sedimentology FOS Earth and related environmental sciences Geology 40311 Stratigraphy incl. Biostratigraphy and Sequence Stratigraphy 40312 Structural Geology 40313 Tectonics Keough, Brandon M 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 |
40310 Sedimentology FOS Earth and related environmental sciences Geology 40311 Stratigraphy incl. Biostratigraphy and Sequence Stratigraphy 40312 Structural Geology 40313 Tectonics |
description |
Paleozoic-Mesozoic stratigraphy exposed in the central Alaska Range includes a diverse assemblage of tectonostratigraphic basement terranes overprinted by late Mesozoic basinformation 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. Results of geologic mapping record progressive Late Cretaceous-Eocene deformation of the Cantwell Formation in a triangle zone and the transition from compressional to strike-slip tectonics in the Eocene. This deformation coincides with regional exhumation of the ARSZ and reconfiguration of the paleosouthern Alaskan margin with the establishment of the modern convergent margin configuration. |
format |
Thesis |
author |
Keough, Brandon M |
author_facet |
Keough, Brandon M |
author_sort |
Keough, Brandon M |
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 |
publisher |
Purdue University Graduate School |
publishDate |
2020 |
url |
https://dx.doi.org/10.25394/pgs.13266563 https://hammer.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 |
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_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.25394/pgs.13266563 |
_version_ |
1766191046871482368 |