Helium and argon isotope geochemistry of the Tibetan Qulong porphyry Cu-Mo deposit,China  

作　　者：Keqiang Peng Liyan Wu Yong Huang Ke Jiang 

机构地区：[1]State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]College of Eco-Environmental Engineering,Guizhou Minzu University,Guiyang 550025,China

出　　处：《Acta Geochimica》2021年第1期32-41,共10页地球化学学报（英文）

基　　金：financially supported by the Strategic Priority Research Program(B)of Chinese Academy of Sciences(XDB18000000);National Natural Science Foundation of China(41773048);The Western Young Scholars Project(Class A)of Chinese Academy of Sciences。

摘　　要：The Qulong porphyry Cu-Mo deposit,generated in the Miocene post-collisional extension environment of the Gangdese Copper(Molybdenum)Metallogenic Belt,is one of the largest porphyry Cu deposits in China.This study reports the noble gas isotopic compositions of volatiles released from fluid inclusion reserved in pyrite from the Qulong deposit.3He/4 He and 40Ar/36Ar ratios range from 0.54 to 1.015 Ra and 300-359,respectively.Concentrations of 4 He and 40Ar range from 1.77 to 2.62×10^(-8)cm^(3)STP and 1.7-34×10^(-8)cm^(3)STP,respectively.The isotopic composition of noble gases indicates that the ore-forming fluids of the Qulong Cu-Mo deposit were a mixture of fluid containing mantle component,which is exsolved from the porphyry magma,and crustal fluid characterized by atmospheric Ar and crustal radiogenic He.Theδ34S values of pyrite and molybdenite range from-0.52‰to 0.31‰,with an average of-0.12‰,indicating a magmatic origin.More mantle components were involved in the Cu-Mo deposit than in the Mo-Cu deposit in the Qulong-Jiama ore-district.

关 键 词：He and Ar isotopes Sulfur isotope Qulong Cu–Mo deposit Ore-forming fluid Tibet China 

分 类 号：P618.41[天文地球—矿床学] P597[天文地球—地质学]