Characteristic of fluid inclusions and genesis of Liba gold deposit, Gansu Province, China

被引：0
|
作者：
Xie Y.-L. [1 ,2 ,3 ]
Shao Y.-J. [1 ,2 ]
Feng Y.-Z. [1 ,2 ]
Zhang Y. [1 ,2 ]
Liu Z.-F. [1 ,2 ]
Liu Q.-Q. [1 ,2 ]
Zheng M.-H. [1 ,2 ]
Tan H.-J. [1 ,2 ]
机构：
[1] Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha
[2] School of Geosciences and Info-Physics, Central South University, Changsha
[3] Hunan Huazhong Mining Co., Ltd, Changsha
来源：
Shao, Yong-Jun (shaoyongjun@126.com) | 2018年 / Central South University of Technology卷 / 28期
关键词：
Carlin-like gold deposit; Fluid inclusion; Liba gold deposit; Lixian-Minxian metallogenic belt; Ore-forming fluid;
D O I：
10.19476/j.ysxb.1004.0609.2018.05.16
中图分类号：
学科分类号：
摘要：
Liba gold deposit is a large deposit, which is located in the east area of Lixian-Minxian metallogenic belt and ore bodies of which are hosted in NW, EW directional dutile-brittle shear zones. Based on detailed field investigation and indoor identification, mineralization in Liba gold deposit can be divided into hydrothermal period and exogenous period. The hydrothermal stage can be subdivided into pyrite stage(A1) and main stages of mineralization including pyrite-sericite-quart stage(A2) and polymetallic stage(A3). A comprehensive study, including petrography and microthermometry shows that A1 stage fluid inclusions are dominated by H2O-solution and minor of CO2-bearing, pure CO2 in compositions, with homogenization temperature clustering concentrated in the range from 380 ℃ to 400 ℃, and the salinities concentrated in the range from 5% to 8% NaCleq. The A2 stage fluid inclusions are dominated by pure CO2, CO2-bearing and minor H2O-solution in composition, with homogenization temperature clustering concentrated in the range from 320 ℃ to 340 ℃, and the salinities concentrated in the range from 8% to 11% NaCleq. The A3 stage fluid inclusions are dominated by pure CO2, CO2-bearing and minor H2O-solution in composition, with homogenization temperature clustering concentrated in the range from 280 ℃ to 300 ℃, and the salinities concentrated in the range from 2% to 6% NaCleq. The fluid inclusions are deduced to be trapped at pressure of the range from 95 MPa to 150 MPa, with the largest metallogenic depth is estimated 5.6 km. Comparative analysis shows that Liba gold deposit accord with carlin type gold deposit in stratoid and lenticular orebody hosted in low metamorphic sedimentary rock, fuzzy boundary between orebody and surrounding rock and fine pyrites, while it accord with orogenic gold deposit, because the fluid inclusion analysis shows that the mineralization fluid is characteristic by CO2-bearing, medium-high temperature and low salinity. Based on geological and fluid inclusions characteristics, Liba gold deposit is regarded as carlin-like gold deposit. © 2018, Science Press. All right reserved.
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页码：994 / 1007
页数：13
相关论文
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