新疆东天山香山铜镍硫化物矿床中铂元素富集机制研究  

Study on Enrichment Mechanism of Platinum in the Xiangshan Cu-Ni Sulfide Deposit,Eastern Tianshan,Xinjiang,China

作　　者：肖凡 王敏芳[2] 班宜忠 夏庆霖[2] 

机构地区：[1]中国地调局南京地质调查中心,南京210016 [2]中国地质大学(武汉)资源学院地质过程与矿产资源国家重点实验室,武汉430074

出　　处：《矿物岩石地球化学通报》2016年第1期118-125,共8页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金项目(41272097);中国地质调查局地质调查项目(1212011085466;12120113083900)

摘　　要：香山铜镍矿床是东天山觉罗塔格成矿带北缘中型铜镍矿床,资源前景颇佳。对香山铜镍矿床中富铜矿石、富镍矿石和浸染状矿石内磁黄铁矿、镍黄铁矿和黄铜矿进行了电子探针分析,以期研究铂元素的富集机制。结果表明,磁黄铁矿和镍黄铁矿早于黄铜矿形成,更富集Co和Se元素,黄铜矿则富集Sb、Bi和Zn等低温元素。Pt元素主要通过岩浆作用富集,但磁黄铁矿和镍黄铁矿中丰度更高,硫化物熔体分异不均衡是导致这种差异性的原因之一。富铜矿石全岩Pt元素含量最高,其原因是Pt元素热液活动性强,且富铜矿石经受了热液作用改造。The Xiangshan Cu-Ni deposit is a medium sized magmatic sulfide deposit located in the northern margin of the Jueluotage metallogenic belt,Eastern Tianshan in Xinjiang,China. In order to study the enrichment mechanism of Pt,EPMA analyses of various sulfides from the Xiangshan deposit have been carried out. Results show that pyrrhotite and pentlandite,which are enriched in Co and Se,were crystalized earlier than chalcopyrite,which is enriched in Sb,Bi,and Zn.The Pt element is mainly enriched in ores of the Xiangshan Cu-Ni deposit due to the magmatism. Especially,Pt abundances of pyrrhotite and pentlandite are higher than that of chalcopyrite due to the disequilibrium fraction of immiscible sulfide melt separated from silicate magma. In addition,Pt contents of Cu-rich massive ore samples are higher than those of the Ni-rich massive disseminated ore samples. This might be resulted from the strong mobility of Pt caused by hydrothermal fluid as the Cu-rich massive sample is hydrothermally altered.

关 键 词：铂元素 富集机制 香山铜镍硫化物矿床 东天山 

分 类 号：P618.41[天文地球—矿床学]