Two of the most important variables that can be determined in any geologic study are the timing and conditions of formation. Although the discovery of radioactivity and isotopes at the beginning of this century revolutionized our understanding of the age and formation conditions of rocks and minerals, the isotope geochemistry of certain mineral groups such as the zeolites has remained elusive and poorly understood. To date fewer than 40 papers have been published on the isotope geochemistry of zeolites. This dearth of isotopic data is due to technical difficulties rather than lack of interest. Recently, however, great strides have been...

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