加拿大Hawk Ridge铜镍成矿带Pd-Pt-Au元素地球化学特征及其指示意义  

The geochemical characteristicsof Pd-Pt-Au elements and its indication in Hawk Ridge Copper-Nickel Metallogenic Belt,Canada

作　　者：胥迎红[1,2] 王京彬[1,2] 黄行凯[2] XU Yinghong WANG Jingbing HUANG Xingkai(School of Earth Science and Resource, China University of Geosciences（ Beijing）, Beijing 100083, China Beijing Institute of Geology for Mineral Resources, Beijing 100012, China)

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]北京矿产地质研究院,北京100012

出　　处：《西北大学学报（自然科学版）》2017年第3期431-440,448,共11页Journal of Northwest University（Natural Science Edition）

基　　金：国外矿产资源风险勘查专项基金资助项目(10254B007)

摘　　要：通过收集整理Hawk Ridge成矿带Faclo7,HA,Gamma,Pio Lake等铜镍硫化物矿床的岩心样品分析数据(Cu,Ni,S,Pd,Pt,Au元素),针对不同岩石类型、矿石类型,进行了Pd,Pt,Au元素地球化学特征分析。(Pd+Pt),Pd/Pt等特征值研究结果表明,Pd,Pt元素与成矿岩体的镁铁质程度、硫化物含量关系密切,而与岩浆后期含矿热液作用关系不大。其中,Pd元素在含矿岩浆中溶解度更高,分异程度更高。Pt/(Pt+Pd)比值和Pt/(Pt+Pd)与Cu/(Cu+Ni)关系图解表明,该成矿带铜镍矿属于与溢流玄武岩有关的铜镍矿床。Au元素地球化学特征表明,Au元素表现出强烈的亲铜属性,受Ni,S元素影响较小,主要受岩浆后期含矿热液叠加作用控制。根据Pd,Pt,Au元素与Cu,Ni,S元素相关性可知,区内浸染状矿石、围岩裂隙内块状铜镍矿石、岩体底部块状铜镍矿石、块状铜矿石,表现出不同的Pd,Pt,Au元素地球化学特征,反映了它们是不同成矿阶段形成的产物。Geochemical characteristics of Pd, Pt, Au elements are studied, according to different types of rocks and ores, by collecting Cu, Ni, S, Pd, Pt, Au elements analysis data of Faclo7, HA, Gamma, Pio Lake copper-nickel sulfide deposits in Hawk Ridge metallogenic belt. The （Pd ＋ Pt）, Pd/Pteharaeteristie value indicates that Pd, Pt elements is closely related to the mafic extent and sulfides content of intrusion, rather than the ore-bearing hydrothermal of late magmatism. Thereinto, Pd element solubility is higher in the ore- bearing magma and its differentiation extent is higher. The value of Pt/（ Pt ＋ Pd） and the diagram of Pd-Pt-Au and Cu-Ni-S correlations show that copper-nickel sulfide deposits, in Hawk Ridge metallogenic belt, are deposits offlood basalt associated subtype. Geochemical characteristics of Au element show that Au is strongly ehaleophile rather than Ni and S elements, which is controlled by the late magmatic ore-bearing hydrothermal superposition. According to Pd-Pt-Au and Cu-Ni-S correlations, disseminated ores, massive ores in the wallrock fissure, massive ores in the bottom of intrusion and massive copper ores show different characteristics of Pd, Pt, Au elements. This note reflects that all of these different types of ores are formed in different stages in the metallogenetic period.

关 键 词：Hawk Ridge成矿带 铜镍硫化物矿床 地球化学特征 岩浆分异 含矿热液 

分 类 号：P595[天文地球—地球化学]