Timing, Provenance, And Paleoclimate Implications Of The Cenozoic Eolian Deposition In The Central Rocky Mountains, USA
This study applies detrital zircon U-Pb geochronology and sandstone petrography to constrain the timing and provenance of Cenozoic eolian sandstone in the central Rocky Mountains. Four samples, collected at the transition to eolian deposition along a west-east transect, have maximum depositional age...
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Geology
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ftunivtexarling:oai:rc.library.uta.edu:10106/24076 2023-06-06T11:46:05+02:00 Timing, Provenance, And Paleoclimate Implications Of The Cenozoic Eolian Deposition In The Central Rocky Mountains, USA Rowley, Jillian Fan, Majie January 2013 application/pdf http://hdl.handle.net/10106/24076 en eng Geology DISS-12464 http://hdl.handle.net/10106/24076 M.S. 2013 ftunivtexarling 2023-04-13T18:59:28Z This study applies detrital zircon U-Pb geochronology and sandstone petrography to constrain the timing and provenance of Cenozoic eolian sandstone in the central Rocky Mountains. Four samples, collected at the transition to eolian deposition along a west-east transect, have maximum depositional ages of 35.9±0.7 Ma, 35.4±2.0 Ma, 33±0.9 Ma, and 30±1.0 Ma, suggesting the transition initiated during the latest Eocene-earliest Oligocene and became younger eastward. A total of 766 zircon grains consist of a 17-44 Ma population, derived from the distal ignimbrite flare-up in western and southwestern North America, and a population older than 45 Ma, recycled from local Laramide uplifts. Sandstone petrography results indicate detritus from the distal ignimbrite flare-up and local Laramide uplifts. The transition to eolian deposition could represent regional drying caused by both global cooling due to initiation of Antarctic glaciation and the development of rain shadow in the central Rocky Mountains due to regional uplift. Fan, Majie Other/Unknown Material Antarc* Antarctic University of Texas Arlington: UTA ResearchCommons Antarctic |
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Open Polar |
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University of Texas Arlington: UTA ResearchCommons |
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ftunivtexarling |
language |
English |
description |
This study applies detrital zircon U-Pb geochronology and sandstone petrography to constrain the timing and provenance of Cenozoic eolian sandstone in the central Rocky Mountains. Four samples, collected at the transition to eolian deposition along a west-east transect, have maximum depositional ages of 35.9±0.7 Ma, 35.4±2.0 Ma, 33±0.9 Ma, and 30±1.0 Ma, suggesting the transition initiated during the latest Eocene-earliest Oligocene and became younger eastward. A total of 766 zircon grains consist of a 17-44 Ma population, derived from the distal ignimbrite flare-up in western and southwestern North America, and a population older than 45 Ma, recycled from local Laramide uplifts. Sandstone petrography results indicate detritus from the distal ignimbrite flare-up and local Laramide uplifts. The transition to eolian deposition could represent regional drying caused by both global cooling due to initiation of Antarctic glaciation and the development of rain shadow in the central Rocky Mountains due to regional uplift. Fan, Majie |
author2 |
Fan, Majie |
format |
Other/Unknown Material |
author |
Rowley, Jillian |
spellingShingle |
Rowley, Jillian Timing, Provenance, And Paleoclimate Implications Of The Cenozoic Eolian Deposition In The Central Rocky Mountains, USA |
author_facet |
Rowley, Jillian |
author_sort |
Rowley, Jillian |
title |
Timing, Provenance, And Paleoclimate Implications Of The Cenozoic Eolian Deposition In The Central Rocky Mountains, USA |
title_short |
Timing, Provenance, And Paleoclimate Implications Of The Cenozoic Eolian Deposition In The Central Rocky Mountains, USA |
title_full |
Timing, Provenance, And Paleoclimate Implications Of The Cenozoic Eolian Deposition In The Central Rocky Mountains, USA |
title_fullStr |
Timing, Provenance, And Paleoclimate Implications Of The Cenozoic Eolian Deposition In The Central Rocky Mountains, USA |
title_full_unstemmed |
Timing, Provenance, And Paleoclimate Implications Of The Cenozoic Eolian Deposition In The Central Rocky Mountains, USA |
title_sort |
timing, provenance, and paleoclimate implications of the cenozoic eolian deposition in the central rocky mountains, usa |
publisher |
Geology |
publishDate |
2013 |
url |
http://hdl.handle.net/10106/24076 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
DISS-12464 http://hdl.handle.net/10106/24076 |
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1767951319780294656 |