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

Abstract

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#l 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 groundwater system. Tertiary units deeper than 1139 m (3733 ft) in drill hole UE25p#l 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#l 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#l 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#l 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.

Probability Distribution for Flowing Interval Spacing

“…Source data: Thordarson et al 1984 [DIRS 103200]; Rush et al 1983 [DIRS 107944];Carr et al 1986 [ 7. CONCLUSIONS…”

Geologic Framework Model Analysis Model Report

“…The main strand of the fault passes along the west side of Fran Ridge. The report for borehole p#l called this the Fran Ridge fault (Carr et al 1986b, Figure 12) and indicated that it intersects borehole p# 1 at the Tertiary-Paleozoic unconformity. This is the interpretation used to construct the Paintbrush Canyon fault in the GFM.…”

Geophysical framework of the southwestern Nevada volcanic field and hydrogeologic implications

“…At the depths indicated, a large volume of magnetic material is required to explain the magnetic high. Therefore, a granitic intrusion or batholith is more likely to be the primary source, perhaps with some contribution from magnetized argillite (Kane and Bracken, 1983;Carr and others, 1986;Oliver, Ponce, and Blank, 1995).…”