东秦岭金堆城花岗斑岩体的锆石U-Pb年龄、物质来源及成矿机制

焦建刚; 汤中立; 钱壮志; 袁海潮; 闫海卿; 孙涛; 徐刚; 李小东

doi:10.3799/dqkx.2010.114

Volume 35 Issue 6

Jun. 2010

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Article Navigation > Earth Science > 2010 > 35(6): 1011-1022

JIAO Jian-gang, TANG Zhong-li, QIAN Zhuang-zhi, YUAN Hai-chao, YAN Hai-qing, SUN Tao, XU Gang, LI Xiao-dong, 2010. Metallogenic Mechanism, Magma Source and Zircon U-Pb Age of Jinduicheng Granitic Porphyry, East Qinling. Earth Science, 35(6): 1011-1022. doi: 10.3799/dqkx.2010.114

Citation:

JIAO Jian-gang, TANG Zhong-li, QIAN Zhuang-zhi, YUAN Hai-chao, YAN Hai-qing, SUN Tao, XU Gang, LI Xiao-dong, 2010. Metallogenic Mechanism, Magma Source and Zircon U-Pb Age of Jinduicheng Granitic Porphyry, East Qinling. Earth Science, 35(6): 1011-1022. doi: 10.3799/dqkx.2010.114

Citation:

JIAO Jian-gang, TANG Zhong-li, QIAN Zhuang-zhi, YUAN Hai-chao, YAN Hai-qing, SUN Tao, XU Gang, LI Xiao-dong, 2010. Metallogenic Mechanism, Magma Source and Zircon U-Pb Age of Jinduicheng Granitic Porphyry, East Qinling. Earth Science, 35(6): 1011-1022. doi: 10.3799/dqkx.2010.114

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Metallogenic Mechanism, Magma Source and Zircon U-Pb Age of Jinduicheng Granitic Porphyry, East Qinling

doi: 10.3799/dqkx.2010.114

1.
School of Earth Science and Resources, Chang'an University, Xi'an 710054, China
2.
Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Xi'an 710054, China
3.
712 Team of Northwestern Geology Exploration Bureau for Nonferrous Metal Resources, Xianyang 712000, China

Received Date: 2009-11-15
Publish Date: 2010-11-01

Abstract

Abstract

Zircon U-Pb isotopic ages of Jinduicheng and Laoniushan granite are measured by LA-ICP-MS techniques, and we find that the mean ages are 143.7±3 Ma and 144.5±4.4 Ma respectively, which correspond to the molybdenite Re-Os age 139±3.0 Ma of Jinduicheng molybdenite polymetallic deposit. It indicates that the diagenetic and metallogenic ages of Jinduicheng deposit are between Jurassic and Cretaceous, related with Yanshan movement. Granites in Jinduicheng are richer in SiO₂, K₂O than those in Laoniushan. The geochemical data demonstrate that Jinduicheng and Laoniushan granites are both characterized with high Si, rich alkali, peraluminous rock series and the calcium alkaline rock series, which indicate that the rock-bodies belong to the continental crust granite; the high ε_Sr (t), low ε_Nd(t), and the Pb isotope values prove the main source of the rock-bodies is partial melting of lower continental-crust materials. The chronology and the litho-geochemical data confirm that Laoniushan and Jinduicheng granite are the same magma source area, and it is concluded that Laoniushan rock body has provided mass hydrothermal and mineral substance in depth for the small Jinduicheng rock body, which in turn led to the phenomenon of the Jinduicheng small rock body containing large ore deposit.
- zircon U-Pb isotopic age,
- metallogenic mechanism,
- granite,
- geochemistry

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References(57)

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Metallogenic Mechanism, Magma Source and Zircon U-Pb Age of Jinduicheng Granitic Porphyry, East Qinling

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