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- W2045019212 abstract "Abstract The δ 18 O of ground water (−13.54 ± 0.05 ‰) and inorganically precipitated Holocene vein calcite (+14.56 ± 0.03 ‰) from Devils Hole cave #2 in southcentral Nevada yield an oxygen isotopic fractionation factor between calcite and water at 33.7 °C of 1.02849 ± 0.00013 (1000 ln α calcite–water = 28.09 ± 0.13). Using the commonly accepted value of ∂( α calcite–water )/∂ T of −0.00020 K −1 , this corresponds to a 1000 ln α calcite–water value at 25 °C of 29.80, which differs substantially from the current accepted value of 28.3. Use of previously published oxygen isotopic fractionation factors would yield a calcite precipitation temperature in Devils Hole that is 8 °C lower than the measured ground water temperature. Alternatively, previously published fractionation factors would yield a δ 18 O of water, from which the calcite precipitated, that is too negative by 1.5 ‰ using a temperature of 33.7 °C. Several lines of evidence indicate that the geochemical environment of Devils Hole has been remarkably constant for at least 10 ka. Accordingly, a re-evaluation of calcite–water oxygen isotopic fractionation factor may be in order. Assuming the Devils Hole oxygen isotopic value of α calcite–water represents thermodynamic equilibrium, many marine carbonates are precipitated with a δ 18 O value that is too low, apparently due to a kinetic isotopic fractionation that preferentially enriches 16 O in the solid carbonate over 18 O, feigning oxygen isotopic equilibrium." @default.
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- W2045019212 date "2007-08-01" @default.
- W2045019212 modified "2023-10-18" @default.
- W2045019212 title "Calibration of the calcite–water oxygen-isotope geothermometer at Devils Hole, Nevada, a natural laboratory" @default.
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- W2045019212 doi "https://doi.org/10.1016/j.gca.2007.05.028" @default.
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