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Re-Os Isotopic Dating of Molybdenite from the Yulong Porphyry Copper-Molybdenum Deposit in Tibet and Its Metallogenic Significance

TANG Ju-xing1,WANG Cheng-hui1,QU Wen-jun2,DU An-dao2,YING Li-juan1,GAO Yi-ming1(1.Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China; 2.National Research Center for Geoanalysis,Beijing 100037,China)  
Located in the north of the Jinshajiang-Honghe porphyry copper metallogenic belt,the Yulong deposit is a giant porphyry copper-molybdenum deposit. This study provides the high-precision Re-Os dating of the mineralization age. The Re-Os model ages for 5 molybdenite samples are from 39.29 Ma to 41.29 Ma. According to the best-fit calculation for 5 samples,the Yulong deposit yield an isochron age of (41.6±1.4) Ma. These data indicate that the mineralization occurred in a very short period with mineralization age span of about 1.5 Ma. And it also implies the special metallogenic environment and metallogenic mechanism of the Yulong porphyry copper-molybdenum deposit.
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