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Geology of drill hole UE25p#1; a test hole into pre-Tertiary rocks near Yucca Mountain, southern Nevada

Carr, Michael D. and Waddell, Sandra J. and Vick, Greg S. and Stock, Joanne M. and Monsen, Susan A. and Harris, Anita G. and Cork, Byron W. and Byers, Frank M., Jr. (1986) Geology of drill hole UE25p#1; a test hole into pre-Tertiary rocks near Yucca Mountain, southern Nevada. Open-file Report, 86-175. United States Geological Survey , Menlo Park, CA.

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Yucca Mountain in southern Nye County, Nevada, has been proposed as a potential site for the underground disposal of high-level nuclear waste. An exploratory drill hole designated UE25p#1 was drilled 3 km east of the proposed repository site to investigate the geology and hydrology of the rocks that underlie the Tertiary volcanic and sedimentary rock sequence forming Yucca Mountain. Silurian dolomite assigned to the Roberts Mountain and Lone Mountain Formations was intersected below the Tertiary section between a depth of approximately 1244 m (4080 ft) and the bottom of the drill hole at 1807 m (5923 ft). These formations are part of an important regional carbonate aquifer in the deep ground-water system. Tertiary units deeper than 1139 m (3733 ft) in drill hole UE25p#1 are stratigraphically older than any units previously penetrated by drill holes at Yucca Mountain. These units are, in ascending order, the tuff of Yucca Flat(?), an unnamed calcified ash-flow tuff, and a sequence of clastic deposits. The upper part of the Tertiary sequence in drill hole UE25p#1 is similar to that found in other drill holes at Yucca Mountain. The Tertiary sequence is in fault contact with the Silurian rocks. This fault between Tertiary and Paleozoic rocks may correlate with the Fran Ridge fault, a steeply westward-dipping fault exposed approximately 0.5 km east of the drill hole. Another fault intersects UE25p#1 at 873 m (2863 ft), but its surface trace is concealed beneath the valley west of the Fran Ridge fault. The Paintbrush Canyon fault, the trace of which passes less than 100 m (330 ft) east of the drilling site, intersects drill hole UE25p#1 at a depth of approximately 78 m (255 ft). The drill hole apparently intersected the west flank of a structural high of pre-Tertiary rocks, near the eastern edge of the Crater Flat structural depression.

Item Type:Report or Paper (Report)
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Stock, Joanne M.0000-0003-4816-7865
Additional Information:© 1986 USGS.
Group:Seismological Laboratory
Series Name:Open-file Report
Issue or Number:86-175
Record Number:CaltechAUTHORS:20150610-092621795
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58149
Deposited By: Tony Diaz
Deposited On:10 Jun 2015 18:41
Last Modified:03 Oct 2019 08:32

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