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为了研究云南东川奚家坪地区玄武岩的铂族元素地球化学特征,本文以奚家坪微量元素和铂族元素的实验数据为基础,首先分析了微量元素和PGE的组成特征及变化趋势,然后以此为依据进行了奚家坪玄武岩部分熔融、硫饱和程度及其对硫化物PGE矿床成矿作用的讨论。最后认为奚家坪玄武岩形成于较低程度的地幔部分熔融(熔融程度约10%),玄武岩中PGE的含量偏低是因为在结晶分异过程中Pd,Pt和Ir进入硫化物矿物相中,随硫化物分异离开了熔体,分异的硫化物可能在岩浆通道附近形成富集PGE的矿床。
In order to study the geochemical characteristics of PGs in Xijiaping area of Dongchuan, Yunnan Province, based on the experimental data of Xijiaping trace elements and platinum group elements, the compositional characteristics and trend of trace elements and PGEs were analyzed firstly, and then based on this The partial melting and sulfur saturation of the Xijiaping basalts and their discussion on the mineralization of sulfide PGE deposits were discussed. Finally, it is considered that the lower part of the Xijiaping basalts is partially melted (melting degree about 10%). The content of PGE in basalt is low because Pd, Pt and Ir enter the sulfide mineral phase during the crystallization process. The matter dissociates from the melt, and the differentiated sulfide may form a PGE-enriched deposit near the magma passage.