The Isotopic Compositions of Copper and Molybdenum from Porphyry Cu-Mo Deposit in the Gangdese, Tibet, and Their Significance

被引：1
|
作者：
Hu W. [1 ]
Zhang Y. [1 ]
Liu J. [1 ]
Guo L. [1 ]
Zhou L. [1 ]
机构：
[1] State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2019年 / 44卷 / 06期
关键词：
Alteration zone; Copper isotope; Deposits; Gangdese metallogenic belt; Molybdenum isotope; Petrology;
D O I：
10.3799/dqkx.2019.077
中图分类号：
学科分类号：
摘要：
We present Mo and Cu isotope of molybdenite and chalcopyrite from two porphyry deposits (Qulong, Dabu) and one quartz-molybdenite vein-type deposit (Jigongcun) along the Gangdese metallogenic belt in the Tibetan Plateau.The results show that the range of δ65/63Cu in the Gangdese porphyry deposit in Tibet is between +0.01‰-+0.98‰, and the range of δ97/95Mo is between -0.34‰ to -0.15‰.The δ97/95Mo of molybdenum in the quartz-molybdenite vein-type deposit is obviously lighter, and cluster from -0.35 ‰ to -0.23‰.Two types porphyry deposits produced in different tectonic settings from the island arc and collisional orogenic belt, it is found that they have similar range of δ65/63Cu in chalcopyrite, all of which are characterized by unimodal distribution; In contrast, the hydrothermal veins and ore-bearing porphyry from the Qulong porphyry deposit have a similar range of δ65/63Cu in chalcopyrite, which suggest that the origin of Cu is consistent. In addition, in the collisional orogenic belt porphyry deposit, different alteration zones have different Cu, Mo isotopic compositions, and from the center outward of the the alteration zone, Cu-Mo isotopic has a certain negative correlation, and this relationship have close relationship with the property of mineral fluid. Comparing the range of δ97/95Mo of the quartz vein type and porphyry type of deposits in the Gangdese area, it is found that the former has a lower δ97/95Mo, which may suggest that the ore sources of the two types of deposits are consistent. © 2019, Editorial Department of Earth Science. All right reserved.
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页码：1923 / 1934
页数：11
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