Mathematics – Logic
Scientific paper
Jul 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.2025s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 51, Issue 7, pp.2025-2034
Mathematics
Logic
3
Scientific paper
Whole rock samples of hydrothermally-altered Biscuit Basin rhyolite from Yellowstone drill cores Y-7 and Y-8 were analyzed for 230 Th, 234 U, 238 U, and 232 Th. Extreme disequilibrium was found, with ( 230 Th/ 234 U) ranging from 0.30 to 1.27. Values of ( 230 Th/ 232 Th) and ( 234 U/ 232 Th) define a linear correlation with a slope of 0.16 ± 0.01, which corresponds to a ( 230 Th/ 234 U) age of approximately 19 ka. The ( 230 Th/ 234 U) disequilibrium was apparently caused by U redistribution which occurred mostly at about 19 ka, and is not related simply to the relative degree of hydrothermal alteration and self-sealing of the rhyolite. Mass balance of U requires a large flux of U-bearing groundwater through the rhyolite at the time of U redistribution; rough estimates of minimum water/rock ratio range from 10 2 to 10 4 , for a range of possible groundwater U concentrations. Conservative hydraulic calculations indicate that the required groundwater flux could have occurred within a period of hundreds of years prior to self-sealing. The disequilibrium data are consistent with a model involving U redistribution during the initial stages of development of a geothermal discharge zone that formed in response to the hydrogeologic effects of glacial melting and unloading during the decline of the Pinedale Glaciation.
Binz Carl M.
Lewis Carter H. III
Sturchio Neil C.
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