矿床地质2012，Vol.31Issue(3)：555-568,14.
新疆东天山康古尔剪切带西段金矿床的成矿流体特征及其地质意义
Ore-forming fluids of main Au deposits in western Kangguer shear zone of Eastern Tianshan Mountains and their geological implications
摘要
Abstract
There exist many Au deposits or ore spots along the Kangguer shear rone in Qol Tag area of Eastern Tianshan Mountains, which is one of the most important Au metallic zones in Xinjiang. This paper focuses on geological characteristics, ore-forming fluid inclusions and H-0 isotopic compositions of three Au deposits which have experienced fairly high degrees of exploration (Hongshi, Kangguer and Matoutan from east to west) in the west segment of the shear zone. The homogenization temperatures of quartz fluid inclusions range from 294.4℃ to 468.0℃ for Hongshi, from 236.9℃ to 441.0℃ for Kangguer and from 150.9℃ to 444.7℃ for Matoutan; the salinities[ω(NaCleq))range from 2.7% to 10.5% for Hongshi, from 4.2% to 9.1% for Kangguer and from6.4% to8.4% for Matoutan; the densities range from 0.50 g/cm3 to 0.83 g/cm3 for Hongshi, from0.80 g/cm3 to 0.86 g/ctn3 for Kangguer and from 0.57 g/cm3 to 0.80 g/cm3 for Matoutan respectively. According to data obtained from this study and previous researches, the δDSMOW isotopic values range from 104‰ to - 63‰ for Hongshi, from - 72‰ to - 45‰ for Kangguer and from - 55‰ to - 45‰ for Matoutan, and S18OH2 o values range from - 1.7‰ to 7.4‰ for Hongshi, from - 8.3‰ to 5.0‰ for Kangguer and from 2.5‰ to 2.6‰ for Matoutan respectively. These analytical data combined with data available suggest that the ore -forming hydrothermal fluids of Hongshi, Kangguer and Matoutan Au deposits were mixed fluids of magmatic and meteoric water, characterized similarly by middle-high temperature, low salinity and high CO2 content. The ore-forming hydrothermal fluids of the Hongshi Au deposit probably had more magmatic water than Kangguer and Matoutan Au deposits. Combining these characteristics with geology, ore-forming fluids and chronology, the authors hold that the Au deposits distributed along the Kangguer ductile shear belt were probably formed by early Permian (295～280 Ma) and late Permian-early Triassic (260～240 Ma) two-stage mineralization, corresponding to the granitoid intrusion in the extension background and the ductile shearing action in the extrusion background respectively.关键词
地球化学/金矿床/流体包裹体/H、O同位素/年代学/韧性剪切带/东天山/新疆Key words
geochemistry, Au deposits, fluid inclusion, H-0 isotopes, chronology, ductile shear zone, Eastern Tianshan Mountains, Xinjiang分类
天文与地球科学引用本文复制引用
张达玉,周涛发,袁峰,范裕,刘帅,宁福泉,孙海怀..新疆东天山康古尔剪切带西段金矿床的成矿流体特征及其地质意义[J].矿床地质,2012,31(3):555-568,14.基金项目
本文得到“十二五”国家科技支撑计划(2011BAB06B01)、国家重点基础研究发展规划项目(2007CB411304、2001CB409800)、新世纪优秀人才支持计划项目(NCET-10-0324)、国家自然科学基金项目(40772057、41040025)和矿床地球化学国家重点实验室开放基金(201102)的联合资助 （2011BAB06B01）
