Relationship between CO_2-bearing fluid and gold mineralization in Haigou gold deposit of Jilin  

作　　者：GAO Song PENG Xiaolei SUN Jinggui FU Lingzhi WANG Jianyu 

机构地区：[1]College of Earth Sciences,Jilin University [2]Jilin Haigou Gold Mining Co.,LTD

出　　处：《Global Geology》2015年第1期1-9,共9页世界地质（英文版）

基　　金：Supported by Project of National Natural Science Foundation of China(No.41172072)

摘　　要：Haigou gold deposit is a typical orogenic gold deposit. There are a reasonable amount of fluid inclusions in the gold deposit,including three types: CO2-H2O-Na Cl inclusions,pure CO2 inclusions and Na Cl-H2 O inclusions,of which most of them are CO2-bearing inclusions. The fluid salinity is 1. 43%- 9. 08%,mainly concentrated in the range of 4. 69%- 5. 41%,the density of CO2 is 0. 69- 0. 80 g / cm3,indicating that the mineralization fluid is low-medium salinity and low density fluid. A series of studies on gold-bearing quartz vein and fluid inclusions show that there exists a positive correlation between the degree of the gold mi-neralization and the amount of CO2 in the inclusions,which means the more CO2-bearing inclusions there are,the higher the content of gold is. CO2 is mainly derived from mantle fluid,and the ore-forming fluid should be derived from mantle fluid and the crust shallow fluid. The conclusions have important denotative meaning on the metallogenic mechanism of orogenic gold deposit and the deep prospecting on metal deposit.Haigou gold deposit is a typical orogenic gold deposit. There are a reasonable amount of fluid inclu- sions in the gold deposit, including three types： CO2-H2O-NaCl inclusions, pure CO2 inclusions and NaCl- H2O inclusions, of which most of them are CO2-bearing inclusions. The fluid salinity is 1.43% -9.08%, mainly concentrated in the range of 4.69% - 5.41% , the density of CO2 is 0.69 - 0.80 g/cm^3 , indicating that the mineralization fluid is low-medium salinity and low density fluid. A series of studies on gold-bearing quartz vein and fluid inclusions show that there exists a positive correlation between the degree of the gold mineralization and the amount of CO2 in the inclusions, which means the more CO2-bearing inclusions there are, the higher the content of gold is. CO2 is mainly derived from mantle fluid, and the ore-forming fluid should be derived from mantle fluid and the crust shallow fluid. The conclusions have important denotative meaning on the metallogenic mechanism of orogenic gold deposit and the deep prospecting on metal deposit.

关 键 词：Haigou gold deposit CO2 fluid gold mineralization orogenic gold deposit ore-forming fluid 

分 类 号：P618.51[天文地球—矿床学]