粤西茶洞银金矿床矿物流体包裹体地球化学研究  

A GEO CHEMICAL STUDY OF FLUID INCLUSIONS IN MINERALS FROM THE CHADONG SILVER-GOLD DEPOSIT IN WESTERN GUANGDONG PROVINCE

作　　者：潘家永[1] 张乾[1] 张宝贵[1] 洪笃豪 李世云 

机构地区：[1]中国科学院地球化学研究所,贵阳550002 [2]中国有色金属总公司广东地质勘查局,肇庆526060

出　　处：《矿物学报》1995年第1期47-54,共8页Acta Mineralogica Sinica

基　　金：中国科学院矿床地球化学开放研究实验室资助

摘　　要：茶洞矿床是粤西地区一个较为典型的蚀变破碎带型多金属矿床。矿物流体包裹体研究表明：该矿床成矿温度160～341℃，成矿压力2．7×106～2．43×107Pa，流体盐度（4．1～15．9）wt％NaCl，流体密度0．880～0．942g／cm3，fCO2为103.7～10.4.3，fs2为10－14.50～10-11.67，fO2为10-45.0～10－35.1，成矿从早至晚均逐渐降低；成矿流体pH值为4．70～7．07，Eh值为－0．65～－1．15，该矿床形成于弱酸性一中性，强还原的物理化学环境；成矿流体为岩浆水与大气降水的混合热液，成矿早阶段以岩浆水为主，到成矿晚阶段，大气降水逐渐增多。The Chadong deposit is a typical polymetallic deposit in western Guangdong Province. Fluid inclusion studies of minerals show that the homogenization temperature (160~ 341℃,ore-forming pressure (2. 7 ×106 ~ 2. 43 ×7Pa ),salinity (4. 1 ~ 15. 9wt % NaCl ), density (0. 880~ 0. 942g/cm3). fCO1(103.7~ 104.3), = (10-14. 50~ 10-11.67)and fO2 (10-45.0~ 10-35.1)all decreased from the early stage to the late stage of ore deposition. pH(4. 70~ 7. 07)and Eh values (-0. 65~ -1. 15 )show that the deposit was formed in a weakly acid-neutral and strongly reducing physicochemical environment. The oreforming fluid is a mixture of meteoric water amd juvenile water with the latter being largely in volved at the early stage of ore deposition.

关 键 词：银矿床 金矿床 液包体 地球化学 

分 类 号：P618.504[天文地球—矿床学]