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Isotopic abundances and ratios of He and Ar found in inclusion fluids in pyrites formed in the Yaoling-Meiziwo tungsten mineralization epoch show that the concentration of 4He varies widely, from 1.54×10−7 cm3 STP/g to 2609×10−7 cm3 STP/g. 3He is 0.759×10−12 cm3 STP/g-3.463×10−12 cm3 STP/g. 3He/4He is 0.0043–4.362 Ra, varying from crustal to mantle values. The concentration of 40Ar ranges from 0.624×10...
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