西藏冈底斯西段帮布勒Pb-Zn-Cu矿床晚白垩世岩浆岩成因及意义

田坎; 郑有业; 高顺宝; 姜军胜; 徐净; 张永超

doi:10.3799/dqkx.2018.349

Volume 44 Issue 6

Jun. 2019

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Tian Kan, Zheng Youye, Gao Shunbao, Jiang Junsheng, Xu Jing, Zhang Yongchao, 2019. Petrogenesis and Geological Implications of Late Cretaceous Intrusion from Bangbule Pb-Zn-Cu Deposit, Western Gangdese, Tibet. Earth Science, 44(6): 1905-1922. doi: 10.3799/dqkx.2018.349

Citation:

Tian Kan, Zheng Youye, Gao Shunbao, Jiang Junsheng, Xu Jing, Zhang Yongchao, 2019. Petrogenesis and Geological Implications of Late Cretaceous Intrusion from Bangbule Pb-Zn-Cu Deposit, Western Gangdese, Tibet. Earth Science, 44(6): 1905-1922. doi: 10.3799/dqkx.2018.349

Citation:

Tian Kan, Zheng Youye, Gao Shunbao, Jiang Junsheng, Xu Jing, Zhang Yongchao, 2019. Petrogenesis and Geological Implications of Late Cretaceous Intrusion from Bangbule Pb-Zn-Cu Deposit, Western Gangdese, Tibet. Earth Science, 44(6): 1905-1922. doi: 10.3799/dqkx.2018.349

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Petrogenesis and Geological Implications of Late Cretaceous Intrusion from Bangbule Pb-Zn-Cu Deposit, Western Gangdese, Tibet

doi: 10.3799/dqkx.2018.349

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
Geological Survey, China University of Geosciences, Wuhan 430074, China
3.
Wuhan Centre, China Geological Survey, Wuhan 430205, China
4.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China

Received Date: 2018-07-16
Publish Date: 2019-06-15

Abstract

Abstract

The Bangbule deposit is located in the western part of the Nyainqing Tanggula Pb-Zn-Ag polymetallic metallogenic belt, which is a newly discovered large skarn Pb-Zn-Cu polymetallic deposit in 2010. The magmatic activity in the mining area is relatively simple, with the development of gray-light gray quartz porphyry, which is mainly composed of stock and dyke, and is closely related to the skarn Pb-Zn-Cu mineralization in space and time. In this paper, based on the detailed field basic geological field work and microscopic observation, we study the geochemistry, zircon U-Pb dating, whole rock Sr-Nd-Pb and zircon Hf isotopes of quartz porphyry. The results showed that the LA-ICP-MS U-Pb age of quartz porphyry is 77.2 ±0.8 Ma and 77.3 ±0.7 Ma, which occurred in the Late Cretaceous. The contents of SiO₂ in quartz porphyry vary from 72.78% to 77.12%, the contents of K₂O are 3.80%~5.55%, and the A/CNK is 0.88-1.18, which showing high-K calc-alkaline, metaluminous and high differentiation I-type granite characteristics. Total REE contents are between 146.89×10^-6 and 247.89×10^-6, which is characterized by relative enrichment of light rare earth and depletion of heavy rare earth. It has obvious anomalies such as Sr, Eu, Nb, Ta and P, suggesting that the magma experienced an important crystallization differentiation process. The ε_Hf(t) of quartz porphyry is concentrated in the range of -7.92 to -5.73, and the corresponding crustal model is 1 651-1 121 Ma. The (⁸⁷Sr/⁸⁶Sr)_i and the ε_Nd(t) are 0.714 8-0.725 8 and -9.01 to -7.32, respectively, with the corresponding second Nd model ages (t_DM²) of 1 612-1 477 Ma. The lead isotopes show that ²⁰⁶Pb/²⁰⁴Pb, ²⁰⁷Pb/²⁰⁴Pb and ²⁰⁸Pb/²⁰⁴Pb are 18.686-18.781, 15.699-15.762 and 39.131-39.344, respectively. In summary, the Bangbule quartz porphyry may have been formed by the magma derived from partial melting of the Mesoproterozoic Lhasa block during the extension environment in the post collision after Bangong -Nujiang south subduction. The discovery of the Late Cretaceous quartz porphyry in the Bangbule deposit shows that there is no absolute eruption in the Gangdese belt (80-70 Ma), which suggesting the continuity of the regional magmatic activity.
- petrogenesis,
- geochemistry,
- Bangbule deposit,
- western Gangdese,
- Tibet,
- deposits,
- petrology

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References(93)

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