Stratigraphic and structural relations of volcanic rocks in drill holes USW GU-3 and USW G-3, Yucca Mountain, Nye County, Nevada

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Authors:Scott, Robert B.; Castellanos, Mayra
Author Affiliations:Primary:
U. S. Geol. Surv., Denver, CO, United States
Fenix and Scisson, United States
Source:Open-File Report - U. S. Geological Survey, No.OF84-0491, 127p. Publisher: U. S. Geological Survey, Reston, VA, United States. ISSN: 0196-1497
Publication Date:1984
Note:In English. 40 refs.
Summary:Geologic, geophysical, and hydrologic potential of the thick sequence of Miocene age ash-flow tuff and related volcanic rock of Yucca Mountain as an underground high-level nuclear waste repository. Major silicic ash-flow tuffs extend through Yucca Mountain with only minor variations in thickness, but the tuffs vary somewhat in degree of welding, physical properties, and extent of alteration. Two major fault sets cut Yucca Mountain at the surface. Although most movement on the faults occurred between 13 and 11.5 m.y. ago, minor activity has persisted into the Pleistocene. Fractures in drill holes USW GU-3 and USW G-3 have a dominant north-northwest strike and a steep southwest dip parallel to fractures observed on the surface. Because fractures provide the major conduits for movement of both vadose and ground water in these tuffs, the correlation between density of fractures and degree of welding of these tuffs becomes important for characterization of this potential nuclear waste repository.—Modified author abstract.
Subjects:Ash-flow tuff; Cenozoic; Cores; Distribution; Engineering geology; Environmental geology; Faults; Fractures; Geologic hazards; Ground water; Igneous rocks; Miocene; Neogene; Neotectonics; Normal faults; Physical properties; Pyroclastics; Radioactive waste; Site exploration; Stratigraphy; Strike-slip faults; Tectonics; Tertiary; Tuff; USGS; Volcanic rocks; Waste disposal; Welded tuff; Nevada; Nye County Nevada; United States; Yucca Mountain; Nevada Test Site region
Coordinates:N365000 N365500 W1162500 W1163000
Record ID:1985007154
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute.
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