A preliminary assessment of the regional dispersivity of selected basalt flows at the Hanford Site, Washington, U.S.A.

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Authors:Lavenue, A. M.; Domenico, P. A.
Author Affiliations:Primary:
Tex. A&M Univ., Dep. Geol., College Station, TX, United States
Volume Title:Journal of Hydrology
Source:Journal of Hydrology, 85(1-2), p.151-167. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0022-1694
Publication Date:1986
Note:In English. 12 refs.; illus. incl. 1 table, sketch maps
Summary:A primary reason why dispersivity has not been analyzed with regional-scale data is the general lack of suitable environmental tracers that have been in the hydrologic environment for long periods of time. Such tracers could normally result from some natural event, perhaps disruptive, that may have transpired in the geologic past. Such an event may have occurred at the Hanford Site, resulting in a chemical enclave of regional proportions. A preliminary interpretation is that the enclave occurs immediately down-gradient from a hydraulic barrier, possibly a fault, which may have placed deeper formations in hydraulic connection with the upper basalts. With this hypothesized source for constituents making up the enclave, the observed concentrations are employed in a preliminary attempt to assess the regional dispersivity. This is the single conceptual model being tested in this paper. The mathematical method employed assumes that the concentration data conform to what would be expected of a perfectly symmetrical enclave, and part of the problem deals with identifying that symmetry. The results obtained are quite reasonable when compared to the range in dispersivities determined in laboratory, tracer, and model-scale studies.—Modified journal abstract.
Subjects:Basalts; Cenozoic; Columbia River Basalt Group; Environmental geology; Faults; Folds; Grande Ronde Basalt; Ground water; Hydraulic conductivity; Hydraulics; Igneous rocks; Lava; Lava flows; Mathematical models; Miocene; Neogene; Properties; Radioactive tracers; Radioactive waste; Regional patterns; Surveys; Synclines; Tertiary; Theoretical studies; Volcanic rocks; Wanapum Basalt; Waste disposal; Benton County Washington; Columbia Plateau; Franklin County Washington; Grant County Washington; Hanford Site; United States; Washington; Basalt Waste Isolation Project; Priest Rapids Member; South-central Washington
Coordinates:N461500 N464500 W1191000 W1200000
Record ID:1986066787
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute.
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