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- W2051208247 abstract "Finding suitable sites for nuclear waste disposal, as well as a wide range of other environmental problems, requires accurate geochronological information to constrain Neogene and Quaternary geologic and hydrogeologic processes. Opal-rich materials in the semi-arid environments of southwest Nevada yield isotopic ages by both U-series dating in the range of 0 to 500 ka (thousand years before present) and U-Pb dating of materials from 10 Ma (million years before present) to 50 ka. These two methods are being used for hydrogeologic and climate studies associated with site characterization of the potential high-level radioactive waste repository at Yucca Mountain. Opal (Si02.nH20) is formed in low-temperature (less than 50~ environments by precipitation from aqueous solutions or by coagulation of colloidal silica gels. Oxygenated surface and vadose waters dissolve uranium from the felsic volcanic rocks. The limited solubility of thorium and lead in these aqueous solutions with near-neutral pH results in low common Pb and 232Th abundances in opal. Consequently, these opal-rich materials typically have e levated uranium contents and large 2 3 0 T h / 2 3 2 T h . . 2 3 8 u / Z O 4 p b . . . . . . acUvlty and ratios, making opal an attractive candidate for 23~ and U-Pb dating." @default.
- W2051208247 created "2016-06-24" @default.
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- W2051208247 date "1998-01-01" @default.
- W2051208247 modified "2023-09-25" @default.
- W2051208247 title "Neogene to Quaternary U-Th-Pb Geochronology Using Opal, Yucca Mountain, Nevada, USA" @default.
- W2051208247 doi "https://doi.org/10.1180/minmag.1998.62a.2.230" @default.
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