杨柳坪岩浆Ni-Cu-PGE硫化物矿床PGE地球化学特征  

PGE GEOCHEMISTRY OF THE YANGLIUPING MAGMATIC Ni-Cu-PGE SULFIDE DEPOSIT

作　　者：郑建斌[1] 曹志敏[1] 宋谢炎[2] 安伟[1] 刘激[1] 

机构地区：[1]中国海洋大学海洋地球科学学院省级海底资源与探测技术重点实验室,青岛266003 [2]香港大学地球科学系

出　　处：《地质与勘探》2004年第5期16-20,共5页Geology and Exploration

基　　金：国家重点基础研究973项目(编号:G1999043200);国家自然科学基金项目(编号:40072037;40273025)联合资助。

摘　　要：杨柳坪岩浆Ni-Cu-PGE硫化物矿床与大石包组玄武岩的PGE原始地幔标准化配分模式为向左倾斜的PPGE富集型。PGE特征参数表明,正子岩窝岩(矿)体与大石包组玄武岩具有负Pt异常和Rh的富集的特征,这可能反映了岩浆早期Pt-Fe合金的析出以及未发生尖晶石相的结晶分离的演化历史。大石包组玄武岩的PGE参数与正子岩窝岩(矿)体的总体趋势具有很好的吻合性,暗示着两者之间具有一定的成生联系。Studies of primitive mantle normalized PGE concentration patterns of the Yangliuping magmatic Ni-Cu-PGE sulfide deposit and Dashibao Formation basalts reveal that, PGE concentration patterns for the Zhengziyanwo intrusion and Dashibao Formation basalts are of positive slope, similar to most of world-class magmatic Ni-Cu-PGE sulfide deposits. Characteristics of this deposit and basalts are their negative Pt-anomaly and high concentration of Rh relative to Pt and Pd, which are interpreted to be the results of crystallization and fractionation of Pt-Fe alloy and spinel phase-free crystallization history for the magma, respectively. PGE parameters of the Dashibao Formation basalts are identical to the general trend of the Zhengziyanwo intrusion, and this might infer that there is a genetic link between them.

关 键 词：岩浆Ni-Cu-PGE 硫化物矿床 PGE配分模式 Pt异常 杨柳坪 

分 类 号：P618.53[天文地球—矿床学] P59[天文地球—地质学]