西藏冈底斯斑岩型铜钼矿床的Cu、Mo同位素组成及其意义

胡文峰; 张烨恺; 刘金华; 郭亮; 周炼

doi:10.3799/dqkx.2019.077

Volume 44 Issue 6

Jun. 2019

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Hu Wenfeng, Zhang Yekai, Liu Jinhua, Guo Liang, Zhou Lian, 2019. The Isotopic Compositions of Copper and Molybdenum from Porphyry Cu-Mo Deposit in the Gangdese, Tibet, and Their Significance. Earth Science, 44(6): 1923-1934. doi: 10.3799/dqkx.2019.077

Citation:

Hu Wenfeng, Zhang Yekai, Liu Jinhua, Guo Liang, Zhou Lian, 2019. The Isotopic Compositions of Copper and Molybdenum from Porphyry Cu-Mo Deposit in the Gangdese, Tibet, and Their Significance. Earth Science, 44(6): 1923-1934. doi: 10.3799/dqkx.2019.077

Citation:

Hu Wenfeng, Zhang Yekai, Liu Jinhua, Guo Liang, Zhou Lian, 2019. The Isotopic Compositions of Copper and Molybdenum from Porphyry Cu-Mo Deposit in the Gangdese, Tibet, and Their Significance. Earth Science, 44(6): 1923-1934. doi: 10.3799/dqkx.2019.077

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

doi: 10.3799/dqkx.2019.077

State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2018-08-25
Publish Date: 2019-06-15

Abstract

Abstract

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 δ^65/63Cu in the Gangdese porphyry deposit in Tibet is between +0.01‰-+0.98‰, and the range of δ^97/95Mo is between -0.34‰ to -0.15‰.The δ^97/95Mo 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 δ^65/63Cu 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 δ^65/63Cu 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 δ^97/95Mo of the quartz vein type and porphyry type of deposits in the Gangdese area, it is found that the former has a lower δ^97/95Mo, which may suggest that the ore sources of the two types of deposits are consistent.
- Gangdese metallogenic belt,
- copper isotope,
- molybdenum isotope,
- alteration zone,
- deposits,
- petrology

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

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