海南尖峰岭岩体热液锆石U-Pb定年及微量元素研究: 对热液作用及抱伦金矿成矿时代的限定

张小文; 向华; 钟增球; 周汉文; 张利; 杨念; 王婧

Volume 34 Issue 6

Jun. 2009

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Article Navigation > Earth Science > 2009 > 34(6): 921-930

ZHANG Xiao-wen, XIANG Hua, ZHONG Zeng-qiu, ZHOU Han-wen, ZHANG Li, YANG Nian, WANG Jing, 2009. U-Pb Dating and Trace Elements Composition of Hydrothermal Zircons from Jianfengling Granite, Hainan: Restriction on the Age of Hydrothermal Event and Mineralization of Baolun Gold Deposit. Earth Science, 34(6): 921-930.

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U-Pb Dating and Trace Elements Composition of Hydrothermal Zircons from Jianfengling Granite, Hainan: Restriction on the Age of Hydrothermal Event and Mineralization of Baolun Gold Deposit

1.
State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Dawei Company of Mine Resources Development in Hainan, Haikou 570206, China

Received Date: 2009-07-06
Publish Date: 2009-11-25

Abstract

Abstract

Detailed studies on zircons from the Jianfengling granite in the Baolun gold deposit indicate that the zircons can be divided into magmatic and hydrothermal zircons. The magmatic zircons are colorless, transparent, prismatic, euhedral crystal with few inclusions, and have moderate U, Th contents (mostly less than 1000μg/g). LA-ICP-MS U-Pb analyses of these zircons gave a weighted mean ²⁰⁶Pb/²³⁸U concordia age of 240±2.1Ma, which is interpreted as the age of emplacement for the Jianfengling granite. Hydrothermal zircons are brown, translucence to opaque, and have extremely high U, Th and trace elements contents, the highest U, Th contents being 30000μg/g, 20000μg/g, respectively. Hydrothermal zircons have high common Pb contents (²⁰⁶Pb_c=0.77%-11.0%). LA-ICP-MS U-Pb analyses of these zircons gave the age from 106 to 120Ma, with a weighted mean ²⁰⁶Pb/²³⁸U age of 112.8±4.3Ma, which is interpreted as the age of hydrothermal event. It is indicated that there is a strong hydrothermal process at ca. 112.8Ma, which might be related to Yanshanian magmatism in this area. Gold mineralization of Baolun gold deposit is most likely related with this hydrothermal event. U-Pb dating on hydrothermal zircons could be used to constrain the timing of hydrothermal event and constrain the timing of gold mineralization related with hydrothermal event.
- Jianfengling granite,
- hydrothermal zircon,
- U-Pb dating,
- Baolun gold deposit,
- geochronology

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U-Pb Dating and Trace Elements Composition of Hydrothermal Zircons from Jianfengling Granite, Hainan: Restriction on the Age of Hydrothermal Event and Mineralization of Baolun Gold Deposit

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