四川盐边高家村岩体地质特征及铂族元素地球化学特征  

Geological and PGE geochemical characteristics of Gaojiacun complex in Yanbian county,Sichuan province

作　　者：伏明珠 凌亚军 李俊 FU Mingzhu;LING Yajun;LI Jun(The 4th Geological Brigade of Sichuan Province,Chengdu 611130,Sichuan Province China)

机构地区：[1]四川省第四地质大队,四川成都611130

出　　处：《地质找矿论丛》2025年第1期9-17,共9页Contributions to Geology and Mineral Resources Research

基　　金：四川省地质局专项项目“四川省盐边县冷水箐地区镍矿靶区优选”(编号:SCDZ-DZKC202404)资助。

摘　　要：高家村杂岩体位于川滇SN向构造带与南岭EW向构造带的西延复合部位,赋矿岩体为橄榄岩,矿石类型为硫化铜镍型。通过对高家村岩体铂族元素特征研究,结果显示:岩体w(Ni)/w(Cu)=0.37~51.4,w(Pd)/w(Ir)=2.18~51.31,w(Pt+Pd)/w(Os+Ir+Ru)=1.86~10.03,w(Pt)/w(Pt+Pd)=0.02~0.73,说明高家村岩体原始岩浆为高镁玄武质岩浆。高家村岩体w(Ir)=0.005×10^(-9)~1.44×10^(-9),w(Pd)/w(Ir)=2.18~51.31,平均为15.62,高于原始地幔值;w(Ni)/w(Cu)=0.37~51.4,平均为10.22,说明高家村岩体部分熔融程度较低。高家村岩体w(Cu)/w(Pd)=3.03~622.98,平均为59.66,平均值大于原始地幔w(Cu)/w(Pd)值,推测高家村岩体经历过深部的硫化物熔离,之后剩余岩浆继续上升到浅部形成现在的高家村岩体。Gaojiacun complex is located at section where the NS Chuan(Sichuan province)-Dian(Yunnan province)structural belt and westward extension of EW Nanling structural belt are compounded.Peridotite is the ore-hosted rock.The ore is Cu-Ni-sulfide type.Geochemistry of the complex is that w(Ni)/w(Cu)=0.37~51.4,w(Pd)/w(Ir)=2.18~51.31,w(Pt+pd)/w(Os+Ir+Ru)=1.86~10.03,w(Pt)/w(Pt+Pd)=0.02~0.73 and indicates that the magma is orignaly high magnisium basaltic magma.w(Ir)value of the complex is 0.005×10^(-9)~1.44×10^(-9),w(Pd)/w(Ir)=2.18~51.31(averagely 15.12)higher than that primitive mantle,w(Ni)/w(Cu)=0.37~51.4(averagely 10.22)indicate poor patial melting of the complex.w(Cu)/w(Pd)=3.03~622.98(averagely 59.66),higher than w(Cu)/w(Pd)of the pritive mantle suggesting deep sulfide melting partition of the magma then the remainder magma upward to be the complex.

关 键 词：高家村杂岩体 铂族元素 地球化学特征 盐边 

分 类 号：P595[天文地球—地球化学]