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| Re-Os Isotopic Age and Geological Significances of the Dongbeigou Molydbenum Deposit in Kuandian, Liaoning Province |
| LIU Gui-xiang, ZHANG Peng, KOU Lin-lin, ZHAO Yan, Bi Zhong-wei, Li Dong-tao |
| Shenyang Center of Geological Survey, CGS, Shenyang 110034, China |
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Abstract The Dongbeigou molybdenum deposit is a newly discovered large-sized cryptoexplosive breccia-type molybdenum deposit in the Kuandian area, Liaoning Province. Molybdenite was selected from for Re-Os dating. Five samples have Re-Os isotopic model ages of 127.1 Ma to 132.6 Ma, yielding an isochron age of 128.1±5.1 Ma, which consistent with the intrusive age of ore-bearing monzogranite (129.4 Ma). It can thus be concluded that both monzogranite and molybdenum deposit were formed in Early Cretaceous. Rhenium content in the molybdenite ranges from 5.10×10-6 to 23.38×10-6, in the range between crust and crust-mantle mixed sources, suggesting that the ore-forming material might be derived from crust or a mixed crustal-mantle source. Combed with the tectonic evolution history of the region, we also infer that the Dongbeigou molybdenum deposit is likely to be the product of subduction of the Pacific plate beneath Eurasia plate.
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Received: 29 May 2017
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