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• W2080478469 abstract "Elevated concentrations (20–1133 nmol/kg) of rare earth elements (REE) are present in acid-sulphate and acid-sulphate-chloride hydrothermal waters of the Yellowstone National Park (YNP). We used recently estimated thermodynamic data (Haas et al 1995) to speciate seventeen YNP hydrothermal fluids with the EQ3NR code. The fluids show a range in pH (2.0–4.0) and temperature (70°–93°C) and are of varied chemistry, with TDS = 155–2,075 ppm, sulphate = 100–10,325 μmol/kg, chloride = 190–24,580 μmol/kg, fluoride = 26–1,790 μmol/kg, and SO4/F = 0.8–323. Field temperature and pH measurements were used in the modelling and saturation with kaolinite and quartz was assumed, although quartz was actually supersaturated. Where possible, oxygen fugacity was calculated from the analytical sulphate/sulphide ratios, otherwise it was set above the hematite-magnetite buffer and pyrite saturation (although speciation calculations show that this is not critical). Carbonate and phosphate levels were set at the analytical detection limit, with the exception of 4 waters for which analytical data for phosphate existed. The waters show little fractionation of REE relative to their host rhyolitic volcanics; it appears that the REE abundances of hydrothermal fluids resulting from alteration of YNP rhyolites are unaffected by the presence of potential complexing species, i.e., that acid-alteration completely strips REE from the portion of the rocks that it affects without any fractionation across the REE series. The main control over REE speciation is the relative abundances of potential complexing agents; however, pH and absolute abundances are also important. In the most acidic waters (pH ∼ 2.0) the free ion is the major species when salinity and SO4/Cl are low (60–80% of each REE), and REE complexes with chloride can be significant (up to 5%). For higher SO4/Cl values, sulphate complexes dominate (80–90%). For less acid waters (pH 2.8–4.0) fluoride is the main complexing agent in low SO4/F fluids, but as the SO4/F ratio increases the sulphate species become dominant, especially for the light REE (LREE)." @default.
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• W2080478469 date "1998-02-01" @default.
• W2080478469 modified "2023-10-03" @default.
• W2080478469 title "Rare Earth Element Speciation in Geothermal Fluids from Yellowstone National Park, Wyoming, USA" @default.
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• W2080478469 doi "https://doi.org/10.1016/s0016-7037(97)00367-0" @default.
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