Uranium geochemistry in geopressured-geothermal aquifers of the U.S. Gulf Coast

Details Uranium geochemistry in geopressured-geothermal aquifers of the U.S. Gulf Coast Uranium geochemistry in geopressured-geothermal aquifers of the U.S. Gulf Coast

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.1233k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 50, Issue 6, pp.1233-1238

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Scientific paper

Formation water from U.S. Gulf Coast geopressured-geothermal sandstone aquifers has been analyzed to determine the geochemistry of uranium in these systems. Results of chemical analyses and chemical equilibrium modeling indicate the formation waters are in equilibrium with uraninite (UO 2 ) and coffinite (USiO 4 ). The 234 U / 238 U activity ratios in the formation waters range from 1.06 to 1.69. These isotopic data suggest that at formation temperatures uranium is continually reequilibrating chemically and isotopically between water, a solid phase of either UO 2 or USiO 4 and a component of 234 U supplied to solution from the aquifer matrix material by alpha recoil processes.

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