云南省墨江县金厂金矿床金银矿物成因矿物学研究
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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.
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.
引文
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[2]俞广钧,谢如勇.墨江金厂金矿床的地质特征及其成因[J].地质与勘探,1986,22(2):11.
[3]俞广钧.哀牢山金矿带原生金矿床的类型及控矿条件[J].地质与勘探,1990,26(5):3.
[4]蔡长金,陆荣军,宋湘荣.中国金矿物志[M].北京:冶金工业出版社,1994.
[5]江永宏,陈光远,孙岱生,等.云南省墨江金厂金矿床铬绢云母系列分类与地质意义[J].地质地球化学,2001,29(1):7-13.
[6]方维萱,胡瑞忠,谢桂青,等.墨江镍金矿床(黄铁矿)硅质岩的成岩成矿时代[J].科学通报,2001,46(10):857-860.
[7]毕献武,胡瑞忠,何明友.哀牢山金矿带ESR年龄测定及其地质意义[J].科学通报,1996,41(14):1301-1303.
[8]刘文龙,陈锦荣,陈光远,等.云南省墨江金厂超基性岩金矿地质[M].北京:地震出版社,1999.
[9]江永宏,李胜荣,王吉中.云南墨江金厂金矿床黄铁矿标型特征研究[J].矿物岩石,2003,23(2):22-26.
[10]江永宏,李胜荣.云南墨江金厂金矿床含铬层状硅酸盐矿物成分标型特征[J].岩石矿物学杂志,2004,23(4):351-360.
[11]孙岱生,陈光远,宋玉国,等.胶东灵山沟金矿成因矿物学[M].武汉:中国地质大学出版社,1993.
[12]储雪蕾,孙敏,周美夫.内蒙古西大井铜多金属矿床矿石的铂族元素分布及物质来源[J].科学通报,2002,47(6):457-461.
[13]陈光远,邵伟,孙岱生.胶东金矿成因矿物学与找矿[M].重庆:重庆出版社,1989.
目录
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