粤西茶洞银金矿床矿质来源的同位素示踪研究  

AN ISOTOPIC TRACING STUDY OF THE MATERIAL SOURCE OF THE CHADONG SILVER-GOLD POLYMETALLIC DEPOSIT IN WESTERN GUANDDONG PROVINCE

作　　者：张乾[1] 张宝贵[1] 潘家永[1] 曹裕波[1] 洪笃豪 杨谦举 

机构地区：[1]中国科学院地球化学研究所 [2]中国有色总公司广东地质勘查局

出　　处：《矿床地质》1993年第4期349-357,共9页Mineral Deposits

基　　金：中国科学院重点项目;中国科学院矿床地球化学开放研究实验室资助项目

摘　　要：文中用硫、铅、氢、氧同位素示踪方法,对茶洞银金多金属矿床的成矿元素及成矿流体来源进行了研究,得出硫主要来自深部岩浆、寒武系地层为Ag、Au、pb、Zn、As等成矿元素的矿源层、成矿流体为大气降水与岩浆水的混合水的结论。δ^(34)S vahies of sulfides in the Chadong silver-gold polymetallic deposit vary in the range of-6.8‰～1.2‰ (-l.l%e on average), suggesting that sulfur mainly came from magmatic activity. Ores and wall rocks (Cambrian schist) have the same lead isotops composition which indicates that the lead is largely radiogenic upper crust lead derived! mainly from the Cambrian schist of the ore district. Ag, Au, Pb, Zn and As contents in the Oambrian schist are 5～50 times higher than their clarke values in the crust, implying that the Cambrian schist might be regarded as the source bed. δD vahies of inclusion water in quartz are 4‰～70‰, and δ^(18)O values are -l.0‰～7.0‰, showing the oreforming fluid to be a mixture of meteoric water and juvenile water. Meteoric water that percolated downward along the fracture zone Was heated by magma and mixed with juvenile water, and the mixed fluid circulated along fractures and fissures and extracted ore-forming elements from the wall rocks; these elements then combined with magma-derived sulfur to form sulfides, which filled and precipitated in the fracture zone, forming the ore deposit.

关 键 词：银金矿床 矿质来源 粤西地区 

分 类 号：P618.5[天文地球—矿床学]