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G. L. Macpherson, R. C. Capo, B. W. Stewart, T. T. Phan, K. Schroeder and R. W. Hammack Temperature-dependent Li isotope ratios in Appalachian Plateau and Gulf Coast Sedimentary Basin saline water Geofluids 14

Version of Record online: 29 JUL 2014 | DOI: 10.1111/gfl.12084

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Lithium, compiled from oil and gas field fluids around the world, correlates generally with depth and with Cl, confirming water–rock interactions are its primary source. δ7Li of Appalachian Plateau and Gulf Basin (USA) water ranges from +4.4‰ to +16.6‰ and follows a coherent temperature trend, despite differences in tectonic histories of the two basins. Equilibrium isotope fractionation predicts a Li source material that is approximately 4‰ lighter than average shale δ7Li.

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