Abstract
It has been proposed that the degree of alteration of basic rocks, as quantified by alteration indices based on H 2O + contents or X-ray diffraction methods, can be used as a predictor of Ar loss. These hypotheses were tested using a sample of 36 zeolite facies metavolcanic basic rocks from Skye, Scotland, U.K., and found to be wanting. Hence, no independent criteria of Ar loss can be determined using these indicators.
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