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δ18O and δD values of the water samples. The cross-hatched region represents International Atomic Energy Agency values for local precipitation, and the values for the Vaal River and Florisbad Hot Springs are from reference 35. Most of the water samples fall on the global meteoric water line; the only exception is water from Beatrix Mine (sample F2). V-SMOW, Vienna Standard Mean Ocean Water. MW, meteoric water.
