Source and Evolution of the Ore-Forming Fluids of Carlin-Type Gold Deposit in the Youjiang Basin,South China:Evidences from Solute Data of Fluid Inclusion Extracts  

作　　者：Xiaoye Jin Chengfu Yang Jianzhong Liu Wu Yang 

机构地区：[1]School of Earth Resources,China University of Geosciences,Wuhan 430074,China [2]Engineering Technology Innovation Center of Mineral Resources Explorations in Bedrock Zones,Ministry of Natural Resources,Guiyang 550081,China [3]Geological Party,Guizhou Bureau of Geology and Mineral Exploration&Development,Guiyang 550018,China [4]School of Resources and Environmental Engineering,Guizhou Institute of Technology,Guiyang 550003,China

出　　处：《Journal of Earth Science》2021年第1期185-194,共10页地球科学学刊（英文版）

基　　金：This study is supported by the Natural Science Foundation of China(Nos.41802094,U1812402);the National Basic Research Program(No.2014CB440906).

摘　　要：The source and evolution of ore-forming fluids is important to understand the genesis of Carlin-type gold deposit.Constraints on the source and evolution of ore fluid components by the con-ventional geochemical methods have long been a challenge due to the very fine-grained nature and complex textures of hydrothermal minerals in these deposits.In this study,we present the crush-leach analyzed solute data of fluid inclusion extracts within quartz,calcite,realgar,and fluorite from the Shuiyindong,Nibao,and Yata gold deposits in the Youjiang Basin,providing new insights into the source and evolution of ore-forming fluids.The results show that the high molar Cl/Br ratios up to 2508 in fluid inclusion extracts are indicative of a contribution of magmatic hydrothermal fluids.Flu-ids mixing between basinal and magmatic-hydrothermal fluids are evident on the plots of Cl/Br versus Na/K ratios,showing that ore-stage milky quartz near the magmatic-hydrothermal fluids reflects magma origin of the ore-forming fluids,whereas late ore-stage drusy quartz and realgar near the de-fined basinal fluids suggest the later input of basinal fluids in late-ore stage.Although the predominate-ly host rocks in Shuiyindong,Nibao and Yata gold deposit are bioclastic limestone,sedimentary tuff,and calcareous siltstone,respectively,the solute data of fluid inclusion extracts records they underwent the similar fluid-rocks reactions between the Na-rich magmatic hydrothermal fluids and the Ca-and Mg-rich host rocks.This study highlights the solute data of fluid inclusion extracts obtained by crush-leach analyses have the potential to fingerprint the source and evolution of ore-forming fluids of the Carlin-type gold deposit.

关 键 词：solute data fluid inclusion source and evolution of ore-forming fluids Carlin-type gold deposit Youjiang Basin 

分 类 号：P618.51[天文地球—矿床学]