Platinum-group element(PGE)geochemistry of the Emeishan basalts in the Pan-Xi area,SW China  

作　　者：ZHONG Hong ZHU Weiguang QI Liang ZHOU Meifu SONG Xieyan ZHANG Yi 

机构地区：[1]Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China [2]Department of Earth Sciences, University of Hong Kong, Hong Kong, China [3]Geological Team 106, Bureau of Geology and Mineral Resources of Sichuan Province, Chengdu 611130, China

出　　处：《Chinese Science Bulletin》2006年第7期845-854,共10页

基　　金：supported by the National Natural Science Foundation of China(Grant No.40473025);the"Hundred Talents"Foundation of the Chinese Academy of Sciences to HZ;the Knowledge Innovation Program of the Chinese Academy of Sciences(Grant No.KZCX3-SW-125)

摘　　要：在 Pan-Xi 区域的 Longzhoushan 和 Ertan 暗岩被部分融化的相对低的度产生(【7% ，在哪个期间当磅和 Pd 是不兼容的时，红外， Ru，和 Rh 是兼容的。大多数这些样品原始披风比那些有高 PGE 集中和大部分 higherPd/lr 和 Cu/Pd 比率。硫化物的小数量(~0.007%) 在部分融化期间留在披风来源，而岩浆的部分到达了硫化物浸透和分离 PGE 富有的硫化物(~0.020%-0.033 百分比) 在期间上升时期。锇，红外，和磅能形成在部分结晶化期间在铬铁矿或硫化物招待的金属性的合金处理的铂组，导致磅和 Pd 内容的去耦和红外内容的可观的变化。硫化物从玄武岩的岩浆分离了可以在岩浆水管附近在 themafic-ultramafic 侵入为 Cu-Ni-PGE 存款(矿化作用) 的形成提供重要材料来源。The Longzhoushan and Ertan basalts in the Pan-Xi area were generated by relatively low degrees of partial melting （〈 7%）, during which Ir, Ru, and Rh are compatible while Pt and Pd are incompatible. Most of these samples have high PGE concentrations and much higher Pd/Ir and Cu/Pd ratios than those of primitive mantle. A small amount of sulfides （-0.007%） remained in the mantle source during partial melting, whereas part of the magmas reached sulfide saturation and segregated PGE-rich sulfides （-0.020%-0.033%） during ascent period. Osmium, Ir, and Pt could form platinum-group metallic alloys hosted in chromites or sulfides during fractional crystallization process, leading to the decoupling of Pt and Pd contents and considerable variations of Ir contents. Sulfides segregated from the basaltic magmas may provide important material sources for the formation of the Cu-Ni-PGE deposits （mineralization） in the mafic-ultramafic intrusions near the magma conduits.

关 键 词：铂族元素 地球化学 玄武岩 硫化物 攀西地区 

分 类 号：P595[天文地球—地球化学]