Geology and uranium evaluation of the Dry Valley tuffs, Washoe County, Nevada
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Authors
Seidl, Richard F
Issue Date
1982
Type
Thesis
Language
en_US
Keywords
Middle-tertiary Rhyolite Ash-flow Tuff , Dry Valley , Nevada , Late-oligocene , Middle-miocene , Ignimbrite Flows , Early-jurassic Metasediments , Meta-volcanics , Peavine Sequence , Cretaceous Sierra Granodiorite , Sierra Nevada Province , Sierra Nevada Basin , Graben , Right-lateral Slip , Walker Lake System , Uranium Mineralization , Carbonaceous Sediments , Tertiary Tuffs , Erosional Unconformities , Gold Mineralization , Mineralized Sericite Alteration Halo , Mackay Theses and Dissertations Grant Collection
Alternative Title
Abstract
The middle-Tertiary rhyolite ash-flow tuffs of Dry Valley, Nevada have an exposed total thickness of 787 feet (240 meters). These 1 ate-01igocene to middle-Miocene ignimbrite flows unconformably overlie early-Jurassic metasediments and metavolcanics of the Peavine Sequence which are in turn intruded by Cretaceous Sierra granodiorite. Adjacent to both the Sierra Nevada Province and the Basin and Range Province, Dry Valley forms a graben between these two provinces. Early-Oligocene and post-Miocene faulting within Dry Valley reflects the right-lateral slip movement of the Walker Lane System.
Uranium mineralization occurs in spotty locations associated with carbonaceous sediments or Tertiary tuffs located in or near erosional unconformities. Gold mineralization has been confined to a weakly mineralized sericite alteration halo located near the contact of a Tertiary tuff host rock and a Triassic-Jurassic metasedimentary rock.
Description
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Citation
Publisher
University of Nevada, Reno
License
In Copyright(All Rights Reserved)