Re-Os Isotopic Age of Molybdenite from the Xiaobaishi W-(Mo) Deposit, Eastern Tianshan, Xinjiang and Its Geological Implication

Ning LI; Fu-quan YANG; Chao LI; Zhi-xin ZHANG; Cheng-dong YANG

doi:10.15898/j.cnki.11-2131/td.201805250064

Ning LI, Fu-quan YANG, Chao LI, Zhi-xin ZHANG, Cheng-dong YANG. Re-Os Isotopic Age of Molybdenite from the Xiaobaishi W-(Mo) Deposit, Eastern Tianshan, Xinjiang and Its Geological Implication[J]. Rock and Mineral Analysis, 2019, 38(1): 112-122. DOI: 10.15898/j.cnki.11-2131/td.201805250064

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Re-Os Isotopic Age of Molybdenite from the Xiaobaishi W-(Mo) Deposit, Eastern Tianshan, Xinjiang and Its Geological Implication

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BACKGROUNDThe Xiaobaishitou W-(Mo) deposit is located in the Central Tianshan Massif of the Eastern Tianshan, Northwestern China. The deposit is a skarn-type tungsten-molybdenum deposit formed by biotite granite and granodiorite intruding into the Mesoproterozoic Kawabulag Group. As one of the most important ore minerals, molybdenite is distributed in granodiorite, biotite granite, skarn and quartz veins.OBJECTIVESTo use molybdenite in order to constrain the mineralization age of the Xiaobaishitou W-(Mo) deposit by Re-Os dating.METHODSDifferent molybdenite grains associated with the granodiorite from the Xiaobaishitou W-(Mo) deposit were selected for Re-Os isotopic dating. The results were compared with the Xiaobaishitou biotite granite age and the chronological data of other Triassic tungsten-molybdenum deposits in the Eastern Tianshan.RESULTSThe molybdenite Re-Os weighted average model age and Re-Os isochron age are 245.0±1.7Ma and 245.5±4.3Ma, respectively.CONCLUSIONSThe dating results indicate that the molybdenite age for mineralization and the emplacement age of the granodiorite are around 245Ma, which is similar to the age of the Xiaobaishitou biotite granite. It provides a key basis for the establishment of an ore deposit model and the determination of the direction for ore prospecting. It also provides important chronological evidence for the ore-forming laws in the eastern Tianshan, and points out that there is a great prospecting potential for a Triassic tungsten and molybdenum metallogenic belt in the eastern Tianshan-Beishan of Gansu.

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Re-Os Isotopic Age of Molybdenite from the Xiaobaishi W-(Mo) Deposit, Eastern Tianshan, Xinjiang and Its Geological Implication

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