石榴子石U-Pb定年在矽卡岩矿床中的应用：以鄂东南高椅山硅灰石（－铜）矿床为例

张小波; 张世涛; 陈华勇; 刘俊安; 程佳敏; 初高彬; 李莎莎

doi:10.3799/dqkx.2019.061

Volume 45 Issue 3

Mar. 2020

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Article Navigation > Earth Science > 2020 > 45(3): 856-868

Zhang Xiaobo, Zhang Shitao, Chen Huayong, Liu Jun'an, Cheng Jiamin, Chu Gaobin, Li Shasha, 2020. Application of Garnet U-Pb Dating in the Skarn Deposit: A Case Study of Gaoyishan Wo (-Cu) Deposit in Southeast Hubei Province. Earth Science, 45(3): 856-868. doi: 10.3799/dqkx.2019.061

Citation:

Zhang Xiaobo, Zhang Shitao, Chen Huayong, Liu Jun'an, Cheng Jiamin, Chu Gaobin, Li Shasha, 2020. Application of Garnet U-Pb Dating in the Skarn Deposit: A Case Study of Gaoyishan Wo (-Cu) Deposit in Southeast Hubei Province. Earth Science, 45(3): 856-868. doi: 10.3799/dqkx.2019.061

Citation:

Zhang Xiaobo, Zhang Shitao, Chen Huayong, Liu Jun'an, Cheng Jiamin, Chu Gaobin, Li Shasha, 2020. Application of Garnet U-Pb Dating in the Skarn Deposit: A Case Study of Gaoyishan Wo (-Cu) Deposit in Southeast Hubei Province. Earth Science, 45(3): 856-868. doi: 10.3799/dqkx.2019.061

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Application of Garnet U-Pb Dating in the Skarn Deposit: A Case Study of Gaoyishan Wo (-Cu) Deposit in Southeast Hubei Province

doi: 10.3799/dqkx.2019.061

Zhang Xiaobo^{1
,
,},
Zhang Shitao^{2
,
,
,},
Chen Huayong^{2, 3},
Liu Jun'an¹,
Cheng Jiamin^{2, 4},
Chu Gaobin^{2, 4},
Li Shasha^{2, 4}

1.
Geological Survey of Hubei Province, Wuhan 430034, China
2.
Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry of Chinese Academy of Sciences, Guangzhou 510640, China
3.
Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou 510640, China
4.
University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2019-01-07
Publish Date: 2020-03-15

Abstract

Abstract

In recent years, in situ U-Pb dating of garnet is a newly developed isotopic dating method about the low-U minerals, yet it has been scarcely applied in the ore deposits and especially in the nonmetal deposits. Based on detailed petrographic observations, two generation of garnets have been distinguished from the Gaojiashan Wo(-Cu) deposit in Southeast Hubei Province, namely the first generational garnet (Grt1) with dark-brown color and the second generational garnet (Grt2) with light-brown color. Electron probe composition analysis (EMPA) shows that both of them belong to andradite to grossularite solid solution series, in which Grt1 is relatively rich in Fe (Adr_62.4Gro_36.5 to Adr_94.4Gro₀), while Grt2 is relatively rich in Al (Adr_32.6Gro_66.4 to Adr_40.2Gro_58.6). LA-ICP-MS U-Pb dating on Grt1 and Grt2 yield Tera-Wasserburg lower intercept ²⁰⁶Pb/²³⁸U age of 142.5±2.0 Ma (2σ, MSWD=1.30, n=38) and 136.0±14.0 Ma (2σ, MSWD=0.42, n=17), which is consistent with the weighted mean ²⁰⁶Pb/²³⁸U ages (139.8±1.5 Ma; 2σ, MSWD=0.10, n=22) of zircon in the quartz monzodiorite at Gaoyishan within the error range, indicating a close genetic relationship between them. The Grt1 with high U concentration and low common Pb content are the major factors for the success of U-Pb isotopic dating.
- garnet,
- U-Pb dating,
- wollastonite skarn,
- ore-forming age,
- Gaoyishan,
- Southeast Hubei Province,
- geochemistry

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References(47)

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Application of Garnet U-Pb Dating in the Skarn Deposit: A Case Study of Gaoyishan Wo (-Cu) Deposit in Southeast Hubei Province

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