| Petrography,chronology and Hf isotope constraints on origin of the ore-bearing granodiorite in Zhibula copper deposit,TibetEI北大核心CSCD |
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| 作者单位： | 1.School of Earth Sciences and Resources, China University of Geosciences, Beijing100083;2.Development and Research Center, China Geological Survey, Beijing100037;3.MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing100037;4.College of Earth Sciences, Chengdu University of Technology, Chengdu, 610059, SichuanSichuan; |
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| 摘 要： | The Zhibula skarn-type copper polymetallic deposit is a large copper deposit. It is located 2-3 km south of the Qulong porphyry copper deposit, in the middle section of the Gandise metallogenic belt in Tibet. The ores are commonly bedded, stratoid and vein-like hosted in the interformational detachment zone between tuff and marble and in the fracture zone. The granodiorite was discovered lately in the drill holes. The contact zone between granodiorite and tuff or marble is skarnized. The skarn-type ore deposit is closely related to the granodiorite as was demonstrated by the gradual change from the tuff, hornfels, and skarn, to the skarnized granodiorite. LA-ICP-MS zircon U-Pb dating yields a weight average 206Pb/238U age of 16.0±0.4 Ma, which is close to the Re-Os isochron age (16.9±0.6 Ma) of molybdenites from the ores. The granodiorite has εHf(t) values in range of 3.2-12 and single-stage model ages between 209-563 Ma, which are similar to those of the Miocene intrusives in the Qulong areas. The zircon Hf isotopic compositions of the granodiorite indicate that the magma is likely resulted from partial melting of the juvenile lower crust. The granodiorites are determined as the ore-forming intrusive of the Zhibula skarn-type deposit, and they are derived from the same magma system with those associate with Qulong deposits. Both of them are are of hydrothermal origin. ©, 2015, Science Press. All right reserved.
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