Constraints on the geochronology of porphyry-skarn copper deposit from U-Pb dating of garnet: a case study of the Sangri copper deposit, Tibet

被引：0
|
作者：
Lin B. [1 ,2 ]
Chen L. [1 ]
Liu Z. [3 ]
Tang J. [1 ]
Zou B. [2 ]
He W. [1 ]
机构：
[1] MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing
[2] Université Laval, G1V0A6, QC
[3] Geological Survey Institute of Jilin Province, Changchun
来源：
Dizhi Xuebao/Acta Geologica Sinica | 2020年 / 94卷 / 10期
关键词：
Garnet; Porphyry mineralization system; Sangri; Skarn deposit; Tibet; U-Pb dating;
D O I：
10.19762/j.cnki.dizhixuebao.2020030
中图分类号：
学科分类号：
摘要：
Skarn deposits, as one of the most economically viable and highly studied deposits, is famous and commonly identified by its mineral zone, metal mineralization, and ore-forming fluid evolution. However, determining the diagenesis age of skarn is a challenge for the mineralization study of skarn deposit in the past decades. The Sangri copper deposit is a newly discovered porphyry-skarn deposit in the middle of the Bangong Co-Nujiang metallogenic belt, located in the Qinghai-Tibet Plateau. Chalcopyrite, pyrite, and molybdenite are the common metal minerals, occurring as veinlet, massive, and disseminated in the porphyry and skarn. The U-Pb age of garnet in the skarn dated by femtosecond laser erosion system with high-resolution inductively coupled plasma mass spectrometer is 83.2±2.3 Ma (MSWD=1.2, n=26), from the Sangri copper deposit in the Bangion county, Tibet. These data showed that diagenesis age of skarn was late Cretaceous. At the same time, compared with the U-Pb age of zircon from the ore-bearing porphyry and the Re-Os age of molybdenite, U-Pb age of garnet was consistent with them within the error range, indicating that they were the products of the same mineralization event. Therefore, the accurate U-Pb dating of garnet can effectively confirm the diagenesis age of skarn deposit or porphyry-skarn deposit. It is a new geochronology method and provides useful support for the metallogenic mechanism study of skarn deposits. © 2020, Science Press. All right reserved.
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页码：2883 / 2892
页数：9
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