High-temperature permeability and groundwater chemistry of some Nevada Test Site tuffs

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doi: 10.1029/JB091iB02p02163
Authors:Moore, D. E.; Morrow, C. A.; Byerlee, J. D.
Author Affiliations:Primary:
U. S. Geol. Surv., Menlo Park, CA, United States
Volume Title:Journal of Geophysical Research
Source:Journal of Geophysical Research, 91(B2), p.2163-2171. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0148-0227
Publication Date:1986
Note:In English. 22 refs.; illus. incl. 5 tables
Summary:Permeability measurements of samples of the Topopah Spring Member of the Paintbrush Tuff and the Bullfrog Member of the Crater Flat Tuff collected from the Nevada Test Site have been made at room temperature an in a temperature gradient. The room temperature permeabilities of the samples ranged from 0.8 × 10-18 to 64 × 10-18m2 for the Topopah Spring Member and 0.5 × 10-18 to 8.4 × 10-18m2 for the Bullfrog Member. These variable permeabilities probably reflect differences in crack and void configurations among the samples. The permeability of a given sample was only slightly affected by heating to maximum temperatures between 90°C and 250°C during experiments of up to 5 weeks' duration. The observed lack of permeability change is consistent with the hypothesis that the disposal of nuclear waste in tuff units in the unsaturated zone at the Nevada Test Site would not have a large effect on the permeability of the host rock. The fluids discharged from the tuff samples during the experiments were mostly dilute solutions of nearly neutral pH, whose compositions differed only slightly from the starting J13 groundwater composition. Waters of this type should be relatively noncorrosive to stainless steel waste canisters. Journal abstract.
Subjects:Bullfrog Member; Cenozoic; Crater Flat Tuff; Engineering geology; Experimental studies; Geochemistry; Geothermal gradient; Ground water; High temperature; Hydrochemistry; Igneous rocks; Miocene; Neogene; Paintbrush Tuff; Permeability; PH; Pyroclastics; Radioactive waste; Rock mechanics; Site exploration; Surveys; Temperature; Tertiary; Topopah Spring Member; Tuff; Underground disposal; Unsaturated zone; Volcanic rocks; Waste disposal; Nevada; Nevada Test Site; Nye County Nevada; United States; Materials, properties
Coordinates:N363500 N375200 W1152000 W1170500
Record ID:1986043912
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute.
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