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At four underground sites in Precambrian Shield rocks in Canada and South Africa, hydrocarbon and hydrogen gases exsolving from saline fracture waters are analyzed for compositional and isotopic signatures. Dominated by reduced gases such as CH 4 , H 2 and higher hydrocarbons (ethane, propane, butane), the most 13 C-enriched methane end-members at all four sites show a pattern...
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