西藏嘎拉勒铜金矿床的成岩成矿时代与岩石成因：锆石U-Pb年龄、Hf同位素组成及辉钼矿Re-Os定年

张志; 宋俊龙; 唐菊兴; 王立强; 姚晓峰; 李志军

doi:10.3799/dqkx.2017.523

Volume 42 Issue 6

Jun. 2017

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Zhang Zhi, Song Junlong, Tang Juxing, Wang Liqiang, Yao Xiaofeng, Li Zhijun, 2017. Petrogenesis, Diagenesis and Mineralization Ages of Galale Cu-Au Deposit, Tibet: Zircon U-Pb Age, Hf Isotopic Composition and Molybdenite Re-Os Dating. Earth Science, 42(6): 862-880. doi: 10.3799/dqkx.2017.523

Citation:

Zhang Zhi, Song Junlong, Tang Juxing, Wang Liqiang, Yao Xiaofeng, Li Zhijun, 2017. Petrogenesis, Diagenesis and Mineralization Ages of Galale Cu-Au Deposit, Tibet: Zircon U-Pb Age, Hf Isotopic Composition and Molybdenite Re-Os Dating. Earth Science, 42(6): 862-880. doi: 10.3799/dqkx.2017.523

Citation:

Zhang Zhi, Song Junlong, Tang Juxing, Wang Liqiang, Yao Xiaofeng, Li Zhijun, 2017. Petrogenesis, Diagenesis and Mineralization Ages of Galale Cu-Au Deposit, Tibet: Zircon U-Pb Age, Hf Isotopic Composition and Molybdenite Re-Os Dating. Earth Science, 42(6): 862-880. doi: 10.3799/dqkx.2017.523

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Petrogenesis, Diagenesis and Mineralization Ages of Galale Cu-Au Deposit, Tibet: Zircon U-Pb Age, Hf Isotopic Composition and Molybdenite Re-Os Dating

doi: 10.3799/dqkx.2017.523

1.
Chengdu Institute of Geology and Mineral Resources, China Geological Survey, Chengdu 610081, China
2.
College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
3.
MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China
4.
Developmen Research Center of China Geological Survey, Beijing 100037, China

Received Date: 2016-12-06
Publish Date: 2017-06-15

Abstract

Abstract

The Gelale Cu-Au deposit in Tibet is an example to probe the regional tectonics, but its ore-forming age is poorly studied, which hinders further studies for the regional tectonics, magmatism and mineralization in the metallogenic belt. The ages and genesis of the intrusive rocks, and the ages of the deposit are determined for the first time in this paper by using the laser ablation-inductively coupled plasma-mass spectrometry(LA-ICP-MS) zircon U-Pb dating, Lu-Hf isotopic test and Re-Os isotopic dating methods. Early diorite yields age of 155.8±2.3 Ma and ε_Hf(t) values of -14.68~-8.34 (-11.74 in average), which is the product of the southward subduction of the Bangong-Nujiang Tethys ocean. The age of the inter-mineral granodiorite is 88±1 Ma(MSWD=0.56, n=21), and yields zircon ε_Hf(t) values between 5.84-9.20, with the average value of 7.72, while the ages of the late granite porphyry is 84.67±0.8 Ma(MSWD=1.9, n=18), and yields zircon ε_Hf(t) values between 6.32-9.78, with the average value of 8.40. Both the granodiorite and granite porphyry emplaced in the Late Cretaceous, which is the product of the convergence of the Lhasa terrane and the Qiangtang terrane.The Re-Os isochron age of molybdenite in the district is 88.55±0.60 Ma (MSWD=0.60, n=8), which is close to the age of the mineralization rock (granodiorite). Comprehensive study shows that the magmatic activities of the deposit corresponed to the subduction and collision environment of the Bangong-Nujiang Tethys ocean, and the Galale copper-gold deposit is the product of the mineralization event of the collision stage.
- magmatic activity,
- metallogenesis,
- subduction,
- collision,
- Galale,
- petrology

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References(75)

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Petrogenesis, Diagenesis and Mineralization Ages of Galale Cu-Au Deposit, Tibet: Zircon U-Pb Age, Hf Isotopic Composition and Molybdenite Re-Os Dating

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