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GEOCHEMISTRY OF PLATINUM GROUP ELEMENTS IN MAFIC-ULTRAMAFIC ROCKS FROM THE XINJIE INTRUSION

Zhang Chengjiang; Wang Yunliang; Li Xiaoling; Xiu Shuzhi;Huang Yongjian (Chengdu Institute of Technology, Chengdu 610059)(Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100080)  
The contents of platinum group elements in mafic-ultramafic rocks from the Xinjie layered intrusion and in basalts and syenites petrogenetically related to the layered intrusion have been determined using neutron activation analysis after a nickel sulphide fire assay preconcentration. The geochemical behavior of platinum group elements during magmatic activation is discussed. It turns out that the distribution of platinum group elements for the Xinjie layered intrusion is similar to that for ferruginous ultramafic rocks in Bushveld and so on, but is different from that for komatiite and Alpine-type peridotite. The distribution of platinum group element for the Xinjie layered intrusion is also similar to that for the Emei Shan basalt. It is proved that the original magma forming the Xinjie layerd intrusion is similar to the original Emei Shan basaltic magma.
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