2011•Journal of Mineralogy and PetrologyRequires access

Re-Os ISOTOPIC DATING OF MOLYBDENITES FROM THE SHAPOLING MOLYBDENUM DEPOSIT IN WESTERN HENAN PROVINCE AND ITS GEOLOGICAL SIGNIFICANCE

Mingtian Zhu

Abstract

The newly discovered Shapoling Mo deposit in the East Qinling Mo ore belt,Henan Province,is a hydrothermal vein-type Mo deposit.Five samples of molybdenite for Re-Os isotopic dating were analyzed and the model ages obtained ranged from 125.4 Ma to 129.4 Ma,with an average of 127.22 Ma±0.85 Ma,and with an isochronic age of 128.1 Ma±7.1 Ma.The age dating indicated that Shapoling Mo deposit was formed in the Middle-Late Yanshanian Period.The Re contents of the molybdenite in the Shapoling Mo deposit were up to 147.2×10-6~ 307.8×10-6,close to Re content of the Huanglongpu Mo deposit in Shanxi Province.It is showed that the formation of the Shapoling Mo deposit was related to large lithosphere thinning event of eastern China and the mantle-derived material and/or fluid was involved in ore-forming process.The porphyry Mo mineralization with great prospecting potential may exist in deep of the Shapoling Mo deposit.

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Key concepts: Molybdenite, Geology, Geochemistry, Prospecting, Mineralization (soil science), Radiometric dating, Molybdenum, Metallogeny