Paleomagnetic stratigraphy, geochemistry and source areas of Miocene ash-flow tuffs and lavas of the Badger Mountain area, northwestern Nevada
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Authors
Park, Steven L.
Issue Date
1983
Type
Thesis
Language
en_US
Keywords
Badger Mountain , Akall Flat , ash-flow tuffs , Nevada , Soldier Meadow Ruff , cathodolumiscence , sanidine phenocrysts , thermoremanent megnetization , magnetic anomalies , caldera , petrologic evidence , chemical evidence , dacitic magmas , high-silica rhyolitic magmas , porphyritic rhyolite , lava , Mackay Science Project
Alternative Title
Abstract
The tuffs of Badger Mountain and Alkall Flat, middle Miocene ash-flow tuffs of northwestern Nevada, are distinguished from the lithologically similar Soldier Meadow Tuff by their lover iron content, leaser cathodolumiscence of sanidine phenocrysts and, for the tuff of Badger Mountain, reversed polarity of thermoremanent magnetization (TRM). Identical TRM directions of the tuff of Alkali Flat and Soldier Meadow Tuff suggest simultaneous eruptions from separate vent areas. Coincident gravity and magnetic anomalies within the Badger Mountain area may reflect a buried caldera (Greene and Plouff. 1981), but the uniform thickness and continuity of the tuffs of Badger Mountain and Alkali Flat preclude their association with it. If present, this buried caldera may be related to the eruption of the Summit Lake Tuff. Porphyritic rhyolite lavas near Devaney Mountain, dated at 14.2 + 0.3 m.y ., exhibit petrologic and chemical evidence of the mixing of dacitic and high-silica rhyolitic magmas.
Description
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Citation
Publisher
University of Nevada, Reno
License
In Copyright(All Rights Reserved)