引用本文：唐菊兴,陈毓川,王登红,王成辉,许远平,屈文俊,黄卫,黄勇.2009.西藏工布江达县沙让斑岩钼矿床辉钼矿铼-锇同位素年龄及其地质意义[J].地质学报,83(5):698-704. tangjuxing,-,-,-,-,-,-,-.2009.Re-Os Dating of Molybdenite from the Sharang Porphyry Molybdenum Deposit in Gongbo'gyamda County, Tibet and Its Geological Significance[J].Acta Geologica Sinica,83(5):698-704.
Abstract:Located in the Zhaxue Yaguila mining area, Nyainqentanglha Range, Tibet, the Sharang deposit is the first porphyry type molybdenum deposit, which has been detailed investigated. It is shown by preliminary survey that the reserves of molybdenum is very large. For the purpose of finding out whether there are mineralization movements during main Indian Asian collision period (41~65Ma) in the Nyainqentanglha mineralization belt, seven molybdenite samples of Yaguila Dongzhongla Sharang mining area were selected to do the Re Os dating. The 187Re and 187Os content are 22.75~46.66（μg/g）and 19.98~40.32（ng/g） respectively, and the 187Re content of the molybdenite is high. The Re Os dating yield a weighted average model age of 51.57 Ma to 52.69 Ma, which is in a narrow range, and an isochrone age of 51±1.0Ma（MSWD=0.55）.The results indicate that there are large scale mineralization movements which is related to the underplating of magma (from 47.0Ma to 52.5Ma(Eocene(about 50Ma)) and the volcanic event(from 43.93Ma to 53.52 Ma) (leads to the forming of the linzizong group pana formation) during the main Indo Asian collision period in the Gangdese belt. It is also proved that the porphyry type molybdenum deposit in the Sharang mining area formed during early Eocene, and the skarn hydrothermal vein type Pb Zn Cu Ag(Mo) deposit which is located about four kilometers away from the granite porphyry of Sharang deposit may also form at the same time.