【摘要】 峨眉山大火成岩省岩浆型Cu-Ni-PGE矿化岩体广泛分布,构成峨眉山地幔柱成矿系统中一个非常重要的成矿系列。本文剖析了峨眉山大火成岩省该类矿床的分布及部分典型矿床的地质地球化学特征和矿化特征,揭示了成矿岩体统一的地幔柱成因,阐述了Cu-Ni-PGE成矿作用与峨眉山地幔柱岩浆活动体系的关系,探讨了由于岩浆演化过程及硫化物熔离富集过程的差异所导致的矿化类型变异。指出Cu-Ni-PGE矿床成矿岩体原始岩浆为地幔柱高程度熔融的高镁玄武岩浆,成矿岩体与峨眉山低钛玄武岩同源,矿化岩体主要产于峨眉山地幔柱活动模型的内带低钛玄武岩分布区;金宝山、朱布、力马河、杨柳坪矿床分别代表峨眉山地幔柱Cu-Ni-PGE成矿作用不同成矿机制的端员类型。更多还原

【Abstract】 There are many magmatic Cu-Ni-PGE deposits widely distributed in the Emeishan Large Igneous Province(ELIP).Through the case study on the distribution of the deposits thoroughly and the geochemical and mineralization characteristics of some typical Cu-Ni-PGE deposits in the ELIP,this paper has revealed the common features of all those ore-bearing intrusions in association with the Emeishan mantle plume,the genetic relationship between the ore-bearing intrusions and the low Ti Emeishan basalt,elucidated the relationship between the Cu-Ni-PGE mineralization and the magmatic system of the Emeishan mantle plume,discussed the mineralization variation caused by the differences of the magmatic evolution processes and the sulfide segregation and enrichment processes.It is believed that the parental magma of Cu-Ni-PGE ore-bearing intrusions was the high-Mg basalt formed by high degree partial melting of the mantle plume,with cognate source to the low Ti Emeishan basalt.The Cu-Ni-PGE deposits are generally located in the inner zone of the mantle plume where low-Ti basalts are widely distributed.It is believed that the Jinbaoshan,Zhubu,Limahe and Yangliuping deposits are representatives of various end types of the Cu-Ni-PGE mineralization through different ore-forming mechanisms.更多还原