云南省墨江县金厂金矿床金银矿物成因矿物学研究  

Genetic mineralogy of Au-Ag serial minerals in Jinchang gold deposit of Mojiang county,Yunnan province

作　　者：江永宏[1,2] 李胜荣[1] 

机构地区：[1]中国地质调查局发展研究中心,北京100037 [2]中国地质大学(北京)地球科学与资源学院岩石圈构造与深部过程及探测技术教育部重点实验室,北京100083

出　　处：《地质找矿论丛》2011年第1期18-22,共5页Contributions to Geology and Mineral Resources Research

基　　金：国家自然科学基金项目(40073012);国家重点基础研究发展规划项目(G1998040800);国土资源大调查项目(199910200264;20001020223023)联合资助

摘　　要：金、银系列矿物在云南墨江金厂金矿床中出现于蛇纹岩、含金石英脉。根据金银矿物的电子探针数据分析,确定了与成因产状对应的形态、赋存状态、矿物共(伴)生组合、化学成分等系列标型。从成矿早期到晚期,金矿物的结晶顺序为自然金→银金矿→自然银,金的成色有下降的趋势,银含量及矿物中微量元素总量却有明显增加的趋势。银金矿中微量元素总量Cu,Cr,Ni,Co最高达到0.81%。自然金中具有高含量的Pt,Os,Ir,银金矿中Pt,Os,Ir含量次之。因为PGE元素中Ir组合相对于Pt组合表现为异常富集,所以揭示矿床成因不仅与超基性岩富含矿质元素Au,Ni,PGE的特点相关,还与超基性岩体外围在发生蛇纹岩化蚀变的过程中温度较高有关。自然银为首次发现,自然银中Cu,Pb,Zn,As,Sb,Bi含量很高,说明矿化很强,是矿化广泛的标志。Au-Ag Serial Minerals include native gold,electrum,and native silver occurring in serpentite and quartz vein in the Jinchang gold deposit of Mojiang county,Yunnan.On the basis of the electron microprobe analysis and microscopy research we set up a series of typomorphism of morphology,occurrence,paragenesis or association,and chemical composition with respect to Au-Ag Serial Minerals.From early to late the crystallization order of the Au-Ag Serial Minerals is native gold→ electrum→ native silver with gold tenor decreased and silver and total trace elements obviously increased.The total amount of the Cu,Cr,Ni and Co in the electrum can reach 0.81%.Native gold is higher in Pt,Os and Ir which are less in electrum.For the PGE Ir group is richer than Pt group.It dose not only reveal that the deposit is genetically related to Au-Ni-PGE-concentrated ultrabasic rock body but also to serpentinization under high temperature in surroundings of the ultrabasic rock body.The native silver is firstly discovered,and Cu,Pb,Zn,As,Sb and Bi are in high content,the indicative of strong and extensive mineralization.

关 键 词：金厂金矿床 金银矿物 成因矿物学 云南省 

分 类 号：P571[天文地球—矿物学] P618.51[天文地球—地质学]