石榴石U-Pb定年对山西义兴寨金矿床角砾岩筒时间的限制和金矿成因的指示

张立中; 陈蕾; 王国平; 邓晓东; 李建威

doi:10.3799/dqkx.2018.547

Volume 45 Issue 1

Jan. 2020

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Article Navigation > Earth Science > 2020 > 45(1): 108-117

Zhang Lizhong, Chen Lei, Wang Guoping, Deng Xiaodong, Li Jianwei, 2020. Garnet U-Pb Dating Constraints on the Timing of Breccia Pipes Formation and Genesis of Gold Mineralization in Yixingzhai Gold Deposit, Shanxi Province. Earth Science, 45(1): 108-117. doi: 10.3799/dqkx.2018.547

Citation:

Zhang Lizhong, Chen Lei, Wang Guoping, Deng Xiaodong, Li Jianwei, 2020. Garnet U-Pb Dating Constraints on the Timing of Breccia Pipes Formation and Genesis of Gold Mineralization in Yixingzhai Gold Deposit, Shanxi Province. Earth Science, 45(1): 108-117. doi: 10.3799/dqkx.2018.547

Citation:

Zhang Lizhong, Chen Lei, Wang Guoping, Deng Xiaodong, Li Jianwei, 2020. Garnet U-Pb Dating Constraints on the Timing of Breccia Pipes Formation and Genesis of Gold Mineralization in Yixingzhai Gold Deposit, Shanxi Province. Earth Science, 45(1): 108-117. doi: 10.3799/dqkx.2018.547

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Garnet U-Pb Dating Constraints on the Timing of Breccia Pipes Formation and Genesis of Gold Mineralization in Yixingzhai Gold Deposit, Shanxi Province

doi: 10.3799/dqkx.2018.547

1.
Mineral Exploration Institute, Zijin Mining Group Co., Xiamen 361006, China
2.
MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resource, Chinese Academy of Geological Sciences, Beijing 100037, China
3.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
4.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2018-10-15
Publish Date: 2020-01-15

Abstract

Abstract

Yixingzhai gold deposit, located in Wutaishan-Hengshan gold district, is the most important and largest gold deposit in Shanxi Province. Spatial distribution of the four breccia pipes shows the well relation with gold mineralization in Yixingzhai deposit. However, robust constraints on the timing of the breccia pipes formation in this deposit are lacking. The relationship between the gold mineralization and breccia formation is also ambiguous. In this paper, systematic U-Pb dating of garnet crystals from skarn breccia and zircon grains from the quartz porphyry were carried out by using laser ablation-inductively coupled plasma mass spectrometry (LA-ICPMS). The garnet grains yielded the ²⁰⁷Pb-corrected weighted mean ²⁰⁶Pb/²³⁸U dates of 140±2 Ma, which is remarkably consistent with U-Pb age of zircon grains (141±1 Ma) from the quartz porphyry in this deposit. This demonstrates that the formation of breccia pipes was genetically related to the coeval magmatism. Therefore, we proposed that gas and hydrothermal fluid released from magma increase the fluid pressure, causing the formation of breccia pipes by cryptoexplosion of the wall rocks. The age of the breccia pipes is also consistent with the formation time of gold mineralization, suggesting that the hydrothermal gold mineralization may link with the fluids released from magma.
- garnet U-Pb dating,
- breccia pipes,
- cryptoexplosion,
- Yixingzhai gold deposit,
- petrology

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References(41)

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