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- Title
Age, genesis, and tectonic setting of the Mo-W mineralized Dongshanwan granite porphyry from the Xilamulun metallogenic belt, NE China.
- Authors
Zhang, Xuebing; Wang, Keyong; Wang, Chengyang; Li, Wen; Yu, Qi; Wang, Yicun; Li, Jianfeng; Wan, Duo; Huang, Guanghuan
- Abstract
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 Mo-W polymetallic deposit, in the northeastern part of the Xilamulun metallogenic belt, occurs along the periphery of a granite porphyry and consists of Mo-W-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 are of 139.9-141.5 Ma and an isochron age is 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 SiO (75.39 wt.%-76.15 wt.%), low Al2O3 (12 wt.%-13 wt.%), 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.
- Subjects
MANCHURIA (China); PLATE tectonics; MINERALIZATION; GRANITE; METALLOGENIC provinces
- Publication
Journal of Earth Science, 2017, Vol 28, Issue 3, p433
- ISSN
1674-487X
- Publication type
Article
- DOI
10.1007/s12583-016-0934-1