The Re Os Isotopic Age of Molybdenite from Duobaoshan and Tongshan Porphyry Copper(Molybdenum)Deposits
黑龙江多宝山、铜山大型斑岩铜(钼)矿床中辉钼矿的铼-锇同位素年龄

The Duobaoshan and Tongshan porphyry copper(molybdenum)deposits are the famous deposits in China Its formation age has been determinated by various methods as 311-220Ma The molybdenite mineralization occurs in the quartz veins or fissures within alterd granodiorite,and its Re Os isochron isotopic age is 506±14Ma This age is more different from the lithogenetic and metallogenetic ages of the deposits Therefore,it provides a clue for further study of the metallogenesis The authors consider that this data may be reflect the age of molybdenite source rockLower Ordovician acid volcaniclactic rocks This study also has discovered the high content of 187 Os in the molybdenite Due to the large estimated reserves of 187 Os,the deposits have tremendous potential economic value.