峨眉山玄武岩分布区内铂族元素异常分析及其找矿远景预测  

THE ANALYSIS ON THE PGE ANOMALY AND ITS PROSPECTING FORECASTING IN THE EMEISHAN BASALTS

作　　者：李晓敏[1] 郝立波[2] 甘树才[2] 来雅文[2] 

机构地区：[1]中国科学院地球化学研究所矿床地球化学开放研究实验室,贵州贵阳550002 [2]吉林大学,吉林长春130061

出　　处：《矿物岩石》2003年第3期21-25,共5页Mineralogy and Petrology

基　　金：国家重点基础研究发展规划项目 (G19990 43 2 12 )

摘　　要：区域地球化学填图成果表明 ,在中国西南川 -滇 -黔交界地区存在一个与产出规模巨大的峨眉山玄武岩分布范围相吻合的 Pt,Pd地球化学巨省。作为地幔热柱成因的峨眉山玄武岩的铂族元素丰度虽略有偏高 ,但玄武岩中铂族元素很难形成可以利用的铂族矿物 ,故该异常是“非找矿异常”。在该区内寻找铂族元素矿床应在基性岩 -超基性岩体出露较多的中岩区南段 ,注意沿循已知的矿床、矿化或较小型基性岩侵入体 ,将矿区 (或岩体 )的整体地质特征、地球化学特征等与典型的岩浆型铂族元素矿床相比较 ,进而研究、预测本矿区或本岩体的铂族元素成矿的可能性及远景规模等 ,寻找岩浆型铂族元素矿床 ,而在岩浆型矿床的周边地质体内注意寻找热液型铂族元素矿床。According to the achievement of regional geochemical mapping,there is a Pt-Pd geochemical mega-province in the southwestern China,which accords with the distribution of Emeishan basalts. The Emeishan basalts which are produced by mantle plume process has slightly high PGE abundance but hardly form available Platinum Group minerals.Therefore,the Pt-Pd anomaly in this region was considered to be an anomaly for non-mineral exploration. To find PGE deposits in this region,much attention should be paid to the south part of middle rock province.Correlation of the geological setting,geochemical characteristics of the known PGE deposits in little basic-rock body with typical magmatic PGE deposits is a way which may lead to the prediction and prospect of new magmatic PGE deposits and hydrothermal PGE deposits around magmatic PGE deposits or basic-rock body.

关 键 词：峨眉山玄武岩 铂族元素 找矿远景 区域地球化学 岩浆型矿床 热液型矿床 

分 类 号：P618.53[天文地球—矿床学] P588.145[天文地球—地质学]