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