西藏中部塔吉冈矿区早白垩世花岗岩成因及地质意义

刘海永; 唐菊兴; 曾庆高; 华康; 赵洪飞; 王雨; 央宗

doi:10.3799/dqkx.2021.100

Volume 47 Issue 4

Apr. 2022

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Article Navigation > Earth Science > 2022 > 47(4): 1217-1233

Liu Haiyong, Tang Juxing, Zeng Qinggao, Hua Kang, Zhao Hongfei, Wang Yu, Yang Zong, 2022. Petrogenesis and Geological Significance of Early Cretaceous Granites in Tajigang Mining Area, Central Tibet. Earth Science, 47(4): 1217-1233. doi: 10.3799/dqkx.2021.100

Citation:

Liu Haiyong, Tang Juxing, Zeng Qinggao, Hua Kang, Zhao Hongfei, Wang Yu, Yang Zong, 2022. Petrogenesis and Geological Significance of Early Cretaceous Granites in Tajigang Mining Area, Central Tibet. Earth Science, 47(4): 1217-1233. doi: 10.3799/dqkx.2021.100

Citation:

Liu Haiyong, Tang Juxing, Zeng Qinggao, Hua Kang, Zhao Hongfei, Wang Yu, Yang Zong, 2022. Petrogenesis and Geological Significance of Early Cretaceous Granites in Tajigang Mining Area, Central Tibet. Earth Science, 47(4): 1217-1233. doi: 10.3799/dqkx.2021.100

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Petrogenesis and Geological Significance of Early Cretaceous Granites in Tajigang Mining Area, Central Tibet

doi: 10.3799/dqkx.2021.100

Liu Haiyong^{1, 2
,
,},
Tang Juxing^{3
,
,},
Zeng Qinggao⁴,
Hua Kang⁵,
Zhao Hongfei²,
Wang Yu²,
Yang Zong²

1.
College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
2.
Tibet Institute of Geological Survey, Lhasa 850000, China
3.
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
4.
Tibet Bureau of Geological and Mineral Exploration and Development, Lhasa 850000, China
5.
The Second Geological Party, Tibet Bureau of Geological and Mineral Exploration and Development, Lhasa 850000, China

Received Date: 2021-05-24
Available Online: 2022-04-29
Publish Date: 2022-04-25

Abstract

Abstract

Tajigang copper polymetallic ore is located in the south margin of southern Qiangtang terrane, providing an ideal window for understanding the tectonic-magmatic activities and mineralization of Bangong Co-Nujiang metallogenic belt. In this paper, it focuses on the granites in Tajigang mining area and reports their zircon U-Pb ages, geochemical and zircon Hf isotopic data. These granite rocks were dated as Early Cretaceous (120-118 Ma) and characterized by high SiO₂, total alkali (Na₂O+K₂O), and low P₂O₅ contents, with aluminum saturation index (A/CNK) of 0.78-1.02, suggesting geochemical affinity to calc alkaline Ⅰ-type granite. Furthermore, the granites display positive ε_Hf(t) values (+3.9-+7.2) with relatively young crustal model age (T_DM^C=717-926 Ma) and show similar Zr/Hf (26.88-38.65), Nb/Ta (7.01-13.61), Sm/Nd (0.17-0.21), and Nb/La (0.32-0.58) ratios to crust, indicating a magma source of juvenile igneous lower crust. Together with data from the recent literature, it proposes that the Tajigang granites formed in a collision setting of Lhasa and southern Qiangtang terranes. In addition, the Tajigang granites show similar geochemical and isotopic compositions with the regional simultaneous metallogenic related rocks which were derived by partial melting of juvenile lower crust. In general, the juvenile crust was enriched in Cu, Au and other elements. Thus, our research proposes that these widely exposed juvenile-crust derived granitic rocks of central Tibet have certain metallogenic conditions and are the key exploration direction for prospecting porphyry Cu-Au deposits in the future.
- Tibetan plateau,
- Bangong Co-Nujiang metallogenic belt,
- Tajigang mining area,
- Early Cretaceous,
- Petrology

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致谢: 感谢武汉上谱分析科技有限责任公司的老师在样品分析测试过程中提供大量帮助，感谢审稿专家对本文提出的建设性修改意见和建议.

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