Preliminary report on the geology and geophysics of drill hole UE25a-1, Yucca Mountain, Nevada Test Site

Spengler, R.W.; Muller, D.C.; Livermore, R.B.

doi:10.3133/ofr791244

Cited by 19 publications

(13 citation statements)

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“…A few faults overlooked in this examination, but recorded by previous workers in published reports (Scott and Castellanos, 1984;Maldonado and Koether, 1983;Spengler et al, 1979;Spengler and Chornack, 1984;Spengler et ai., 1981), were added to the data. Distinct stratal inclinations also were noted; these were combined with dips published in the above reports.…”

Section: Study Methodsmentioning

confidence: 63%

Structure in continuously cored, deep drill holes at Yucca Mountain, Nevada, with notes on calcite occurrence; Yucca Mountain Site Characterization Project

Carr¹

1992

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Section: Study Methodsmentioning

confidence: 63%

Structure in continuously cored, deep drill holes at Yucca Mountain, Nevada, with notes on calcite occurrence; Yucca Mountain Site Characterization Project

Carr¹

1992

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“…Borehole UE25a-1, hereafter referred to as A-l, was drilled during 1978 in an area known informally as Drill Hole Wash, a northwest oriented dry stream bed crossing the eastern boundary of Yucca Mountain. The borehole reached a depth of 762 m, penetrating the same upper section as the G-3 borehole ( Figure 2) and terminating in the Bullfrog Member of the Crater Flat Tuff [Spengler et al, 1979]. In addition a 6.7-m section of the Pah Canyon Member of the Paintbrush Tuff was encountered.…”

Section: Description Of Boreholesmentioning

confidence: 93%

Physical properties of ash flow tuff from Yucca Mountain, Nevada

Nelson¹,

Anderson²

1992

J. Geophys. Res.

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We have measured the density and determined the porosity of 198 samples of ash flow tuffs from three boreholes at Yucca Mountain, Nevada. The electrical properties, velocity, and permeability of many of these samples have also been determined. We use mineralogical and physical data from other sources to determine the dependence of measured physical properties upon petrology. Porosity in the samples varies over a wide range, from as low as 1% in the densely welded tuffs to 53% in the zeolitized nonwelded tuffs. Porosity is the primary control on the other measured physical properties that consequently vary over broad ranges. Alteration (zeolites and clays) is a primary control on grain density and a significant secondary control on bulk density, resistivity, velocity, and permeability. Sorting the samples into rock classes defined in terms of the degree of welding and gross mineralogy enables us to separate the influence of zeolites and clays from that of porosity. Empirical rock property relationships established for sandstones can be applied with good success to tuffs. Archie's law relating resistivity to porosity is found to fit the unaltered samples with an exponent m of 2.0. An empirical expression relating compressional velocity to porosity and clay content forms an excellent upper bound to the velocity-porosity data. Permeability-porosity plots are similar in form to those obtained for clastic rocks, although the permeability is considerably lower than in clastic rocks of similar porosity. Zeolites and clays reduce the grain density, increase the electrical conductivity, reduce the compressional velocity, and reduce the permeability. tained in boreholes in Rainier Mesa on the northern extremity of NTS. A series of reports [Carroll and Magner, 1988; Carroll, 1989, 1990] describes the measurement difficulties, presents the borehole logs, and discusses the physical properties of volcanic tuffs at Rainier Mesa.

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“…At YM, m r k e mapping showed the existence of a relatively undisturbed structural block, potentially large enough for a repository. In 1978, an exploratory hole confirmed the presence of thick sequence of voicanic much of it rich in sorptive zeolite minerals (Spengler et al, 1979).…”

Section: Nevada Test Sitementioning

confidence: 98%

The siting record: An account of the programs of federal agencies and events that have led to the selection of a potential site for a geologic respository for high-level radioactive waste

Lomenick¹

1996

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This report was p r e p a d as an account of work sponsored by an agency of the United States government. Neither the United States government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product or process disclosed,or represents that its use would not infringe privately owned rights. References herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute o r imply its endorsement, recommendation, or favoring by the United States government or any agency thereof. The views and opinions of the author crpressed herein do not necessarily state or reflect those of the United States government o r any agency thereof.

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Preliminary report on the geology and geophysics of drill hole UE25a-1, Yucca Mountain, Nevada Test Site

Cited by 19 publications

References 0 publications

Structure in continuously cored, deep drill holes at Yucca Mountain, Nevada, with notes on calcite occurrence; Yucca Mountain Site Characterization Project

Structure in continuously cored, deep drill holes at Yucca Mountain, Nevada, with notes on calcite occurrence; Yucca Mountain Site Characterization Project

Physical properties of ash flow tuff from Yucca Mountain, Nevada

The siting record: An account of the programs of federal agencies and events that have led to the selection of a potential site for a geologic respository for high-level radioactive waste

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