西藏中冈底斯成矿带查个勒铅锌矿床含矿斑岩年代学及其地质意义

doi:10.13278/j.cnki.jjuese.201506110

Abstract

Abstract:

The newly discovered Chagele skarn-porphyry deposit is located in the Middle-Gangdese metallogenic belt. This study focuses on the zircon U-Pb age of the ore-bearing porphyry and molybdenite Re-Os, the whole rock major elements, trace elements, and the Sr-Nd-Hf isotopic data of the ore-bearing rocks in Chagele deposit. The zircon U-Pb age of the ore-bearing porphyry changes from 64.6 to 62.9 Ma, which represents the magmatic crystallization age. The Re-Os isotopic age shows that the deposit was formed at (62.3±1.4) Ma, which is consistent with the magmatic age in the study area. Combing with the extensive volcanic event of Linzizong Group, these new data suggests that the different scales of mineralization were formed at different stages in the entire collision between India and Eurasia continent. The ore-bearing porphyry of Chagele deposit has high contents of SiO₂, K₂O, Rb, Th, and U, coupled with low contents of TiO₂, P₂O₅, negative anomalies of Nb, Zr, variable ε_Hf(t) (-7.02~-1.27), and ancient T^C_DM (1 093~1 419 Ma). In comparison with the Gangdese continental crust composition, the ore-bearing porphyry is high in ε_Nd(t) (-6.64~-5.79) and low in (⁸⁷Sr/⁸⁶Sr)_i (0.711 813~0.717 307). These geochemical features indicate that the porphyry of Chagele deposit is similar to the peraluminous feature of S-type granite. The above discussion suggests that the Paleocene magmatism and mineralization in the middle section of the Middle-Gangdese metallogenic belt could be formed through partial melting of the ancient crust materials of Gangdese micro-continent accompanying with fractional crystallization, which was probably induced by upwelling of mantle-derived magma in the main collision between Indian and Eurasia continent.

Key words: zircon U-Pb dating, molybdenite Re-Os age, main collisional period, Chagele lead-zinc deposit, Middle-Gangdese metallogenic belt

CLC Number:

P618.4

Duan Zhiming, Li Guangming, Wang Baodi, Li Yingxu, Huang Yong, Guo Lin, Duan Yaoyao. Geochronology and Its Geological Significance of the Ore-Bearing Porphyry in Chagele Lead-Zinc Deposit in Middle-Gangdese Metallogenic Belt, Tibet[J].Journal of Jilin University(Earth Science Edition), 2015, 45(6): 1667-1690.

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Geochronology and Its Geological Significance of the Ore-Bearing Porphyry in Chagele Lead-Zinc Deposit in Middle-Gangdese Metallogenic Belt, Tibet

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