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Age, genesis, and tectonic setting of the Mo-W mineralized Dongshanwan granite porphyry from the Xilamulun metallo-genic belt, NE China

Xuebing Zhang1, Keyong Wang*1,, Chengyang Wang2,et al.
1. College of Earth Sciences, Jilin University, Changchun 130061, China; 2. Department of Earthquake Science, Institute of disaster prevention Science and Technology, Beijing 101601, China;3. Inner Mongolia Shandong Gold Minerals Survey Co. Ltd, Chifeng 024005, China;4. Heilongjiang Institute of Regional Geology Survey, Harbin 150080, China;5. College of Urban and Environmental Sciences, Liaoning Normal University, Dalian 116029, China

The Xilamulun molybdenum polymetallic metallogenic belt in eastern Inner Mongolia forms one of the most important Mo metallogenic belts in northeastern China. The Dongshanwan porphyry W-Mo polymetallic deposit, in the northeastern part of the Xilamulun metallogenic belt, occurs along the periphery of a granite porphyry and consists of W-Mo-Ag sulfide and oxide disseminations and veinlets in hydrothermal assemblages. LA-ICP–MS zircon U–Pb dating of the Dongshanwan granite porphyry yields a crystallization age of 142.15 ± 0.91 Ma, whereas molybdenite Re–Os isotopic dating model ages of 139.9–141.5 Ma and an isochron age of 140.5 ± 3.2 Ma (MSWD = 1.2). The age consistency indicates that the Dongshanwan deposit was a product of Early Cretaceous magmatism. The Dongshanwan granite porphyry is a high-alkali high-potassium intrusion and has high SiO2 (75.39%–76.15%), low Al2O3 (12%–13%), Ba, Ti, P, and Sr contents, with negative Eu anomalies. The Y/Nb ratios are comparable to those of average continental crust and island arc basalts, corresponding to type-A2 granites. Our geochemical data indicate that the granite porphyry emplaced in an Early Cretaceous post-orogenic extensional environment following Mongol–Okhotsk oceanic subduction and subsequent continental collision.

 

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Keywords:Dongshanwan porphyry W-Mo deposit, Zircon U-Pb dating, Re-Os dating, geochemistry, Xilamulun metallogenic belt.

DOI:
10.1007/s12583-016-0934-1
CLC number:
U469.72
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