西藏昂仁县多仁则—桑阿卡地区铜多金属矿点含矿岩体成因及成矿意义

doi:10.13278/j.cnki.jjuese.20190280

Abstract

Abstract: The magmatic rocks in Gangdise metallogenic belt are the products of collision orogeny between Indian and Eurasian plates, and are of great significance to the study of collision orogeny and mineralization. Duorenze-Sangaka area is located in the south-central part of Gangdise volcano-magmatic arc, where ore-bearing gray white medium- to fine-grained biotite granodiorite is developed. The study of petro-geochemistry, Sr-Nd isotope, and LA-ICP-MS zircon U-Pb dating of the biotite granodiorite show that its emplacement age is (49.0±0.7) Ma, in Eocene period. The biotite granodiorites are featured by high silicon (w(SiO₂)=67.13%), potassium (w(K₂O)=3.72%), alkali-rich (w(K₂O+Na₂O) =7.48%), and low MgO (1.34%, less than 3%), which belong to high potassium calc-alkaline and highly differentiated I-type granite. The Eu negative anomaly (δEu=0.70) and Sr depletion suggest plagioclase crystallization during magmatic evolution. These samples are rich in Th, U, K, Nd, Zr, Hf, and poor in Nb, Ta, Sr, Ti, P. Their whole-rock Sr-Nd isotopes ((⁸⁷Sr/⁸⁶Sr)_i=0.705 280-0.705 530, ε_Nd(t)=-2.2-1.6), trace elements, and element ratios reveal that they were derived from mixed crust-mantle sources. The magmatic-hydrothermal mineralization was likely caused by partial melting of lower crust, which was triggered by asthenospheric mantle upwelling through the plate break-out window during the plate fragmental subduction-post-collision of Indian and Eurasian plates. The comprehensive study shows that the porphyry-hydrothermal vein-type copper polymetallic mineralization in Duorenze-Sangaka area was resulted from the eruption of Early Eocene magmatism, which is an important part of the Cu-Au-Mo-Fe-Pb-Zn metallogenic system (52-47 Ma) related to crust-mantle granitic magmatism in Gangdise metallogenic belt.

Key words: Duorenze-Sangaka area, zircon U-Pb age, geochemistry, I-type granite, Sr-Nd isotope, slab breakoff, Gangdise metallogenic belt

CLC Number:

P588.12

Zhao Yayun, Liu Xiaofeng, Liu Yuanchao, Ci Qiong, Zheng Changyun, Yang Chunsi, Li Li, Fu Hailong. Petrogenesis and Metallogenic Implication of Ore-Bearing Rock Mass of Copper Polymetallic Ore Occurrence in Duorenze-Sangaka Area, Angren County, Tibet[J].Journal of Jilin University(Earth Science Edition), 2020, 50(5): 1323-1339.

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Petrogenesis and Metallogenic Implication of Ore-Bearing Rock Mass of Copper Polymetallic Ore Occurrence in Duorenze-Sangaka Area, Angren County, Tibet

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