【摘要】 金宝山岩体是西南暗色岩系中的一个典型族元素矿化岩体,本文通过对岩体铂族元素地球化学特征的分析,探讨了岩体的成因属性。研究表明,金宝山岩体铂族元素特征与西南暗色岩区大部分铜镍硫化物型铂族元素含矿岩体基本相同,类似于典型地幔柱源的冰岛玄武岩及俄罗斯诺里尔斯克岩体,是地幔柱活动类OIB源部分熔融作用产物,成因上与峨眉山地幔柱活动相联系。更多还原

【Abstract】 The Jinbaoshan intrusion, situated in Midu county, Yunnan, is a classic mafic-ultramafic intrusion with PGE mineralization in Southwestern Trap. This paper discussed the characteristics of PGE geochemistry of the intrusion. For the strong fractionated distribution patterns of PGE, it′s clear that the intrusion originated from basic magma rather than ultra-mafic, and it′s from OIB-like mantle source for its lower ratio in Pd relative to Ir. In general, the distribution patterns of PGE in Jinbaoshan intrusion are the same as the other intrusions in Southwestern Trap, and similar with that of Iceland basalts and Noril′sk intrsion, which are believed to be the mantle plume products. Thus, Jinbaoshan intrusion can be linked genetically with Emeishan mantle plume.更多还原