摘要
金宝山铂钯矿是峨眉山大火成岩省具有典型意义的岩浆Ni-Cu-PGE矿床,成矿岩体岩矿石Rb-Sr,Sm-Nd,Re-Os同位素特征表明:成矿岩浆为地幔柱成因并受到岩石圈地幔和地壳混染作用的影响。εNd(260 Ma)=-1.78^+0.81,介于地幔柱与岩石圈地幔之间但明显靠近地幔柱的同位素组成。γOs(260 Ma)=20~60,高于任何端元类型的地幔储集库,体现地壳混染作用的效果。模式分析认为,成矿岩浆形成演化过程中大约有10%的岩石圈地幔熔体混合并受到5%左右的下地壳混染。
Jinbaoshan Pt-Pd deposit is a numerous Ni-Cu-PGE deposits in the Emeishan large igneous province.Sr-Nd-Os isotopic compositions of the rocks and ores showed that the ore deposit was of mantle plume generation.Values of γOs（260 Ma） ranged from 20 to 60 and εNd（260 Ma） from-1.78 to ＋0.81,indicating significant interaction of the plume-derived melting with the lithosphere and crustal contamination.Model analysis showed that the SCLM melting added to the plume-derived melting in proportion of about 10% and lower continental crustal contamination in proportion of about 5%.
出处
《矿物岩石》
CAS
CSCD
北大核心
2010年第2期60-67,共8页
Mineralogy and Petrology
基金
中国科学院重要方向项目(KZCX2-YW-Q04-06)
国家自然科学基金项目(40773033
40973039)
中国科学院百人计划项目
