2009•Rock and Mineral AnalysisRequires access

Re-Os Isotopic Dating of Molybdenite in Skarn from the Jiama Copper Polymetallic Deposit of Tibet and Its Metallogenic Significance

Zheng Wen-bao

Abstract

Different molybdenites were collected from the Jiama copper polymetallic deposit for Re-Os isotopic dating. The isochron age of (15.34±0.10) Ma,and model age of (15.21±0.22) Ma~(15.50±0.22) Ma were obtained. This results are similar to the data from the previous Re-Os dating results,which indicates that the mineralization age of molybdenites in Jiama is around 15 Ma. According to Re-Os dating results of other molybdenite from porphyry copper deposits in Gangdese belt,which is considered to have the similar mineralization age with that of the Jiama copper polymetallic deposit,it provides a reference for further study on geological genesis of the Jiama copper polymetallic deposit and a theoretical basis for deep earth prospecting of porphyry-skarn ore bodies.

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Key concepts: Isochron, Skarn, Molybdenite, Geology, Geochemistry, Mineralization (soil science), Prospecting, Radiometric dating