Geology and uranium evaluation of the Dry Valley tuffs, Washoe County, Nevada
AuthorSeidl, Richard F
Geological Sciences and Engineering
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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.
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Subjectmiddle-Tertiary rhyolite ash-flow tuff
Cretaceous Sierra granodiorite
Sierra Nevada Province
Sierra Nevada Basin
Walker Lake System
mineralized sericite alteration halo