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Geology, physical properties, and surface effects at Discus Thrower Site, Yucca Flat, Nevada test site

Open-File Report 75-410
By: , , and 
https://doi.org/10.3133/ofr75410

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Abstract

Geologic studies in connection with Project Discus Thrower have furnished detailed stratigraphic and structural information about northwestern Yucca Flat. The Paleozoic rocks consist of a lower carbonate sequence, argillite of the Eleana Formation, and an upper carbonate sequence. The distribution of these rocks suggests that both top and bottom of the Eleana are structural contacts, probably thrusts or reverse faults. The overlying tuff includes several units recognized in the subsurface, such as the Fraction Tuff and tuff of Redrock Valley. Other units recognized include bedded tuff associated with the Grouse Canyon Member of Belted Range Tuff, and the Rainier Mesa and Ammonia Tanks Members of the Timber Mountain Tuff. The Timber Mountain and Grouse Canyon are extensively altered to montmorillonite (a swelling clay), possibly as a result of ponding of alkaline water. The overlying alluvium locally contains at the base a clayey, tuffaceous sandstone. Geophysical logs were used as an aid in locating geologic contacts and determining in situ physical properties. Graphic logs are presented that show the correlation of lithology and geophysical logs. Many of the rock units have characteristic log responses, but alteration within rock units affects the logs strikingly in some drill holes. The most significant surface effect of the experiment was the formation of a 4-foot fault scarp northwest of the site.

Suggested Citation

Carr, W.J., Miller, C., Dodge, H., 1975, Geology, physical properties, and surface effects at Discus Thrower Site, Yucca Flat, Nevada test site: U.S. Geological Survey Open-File Report 75-410, ii, 27 p. :ill., maps ;28 cm., https://doi.org/10.3133/ofr75410.

ISSN: 2331-1258 (online)

Publication type Report
Publication Subtype USGS Numbered Series
Title Geology, physical properties, and surface effects at Discus Thrower Site, Yucca Flat, Nevada test site
Series title Open-File Report
Series number 75-410
DOI 10.3133/ofr75410
Year Published 1975
Language ENGLISH
Publisher U.S. Dept. of the Interior, Geological Survey,
Description ii, 27 p. :ill., maps ;28 cm.
Additional publication details