云南二叠纪白马寨铜镍硫化物矿床的成因:地壳混染与矿化的关系

被引：21

作者：

王焰

机构：

[1] 中国科学院广州地球化学研究所

来源：

矿物岩石地球化学通报 | 2008年 / 27卷 / 04期

关键词：

铜镍硫化物矿床; 地壳混染; 不混溶硫化物; 白马寨;

D O I：

暂无

中图分类号：

P618.4 [有色金属];

学科分类号：

0709 ; 081803 ;

摘要：

云南金平白马寨-营盘街一带的奥陶纪变砂岩和板岩中出露大量小型约260Ma的镁铁-超镁铁质岩体,其中白马寨地区三个岩体具明显铜-镍硫化物矿化:三号岩体有一个中型铜镍硫化物矿床,一号和二号岩体可见微弱矿化。一号岩体的Ni/Cu值为0.7～2.2,二号岩体的Ni/Cu值为1.4～4.0,与三号岩体的比值(Ni/Cu=0.5～6.7)相近,说明他们的母岩浆成分接近,为富Mg的镁铁质或苦橄质岩浆。三个岩体遭受不同程度的地壳混染,表现为强烈的Nb(Ta)异常,很低的Nb/La值(0.5～0.7)和很负的εNd(t)值(-5.1～-9.0)。根据全岩的Th/Yb和Nb/Th值估算,一号岩体的地壳混染程度为5%～20%,二号岩体的地壳混染程度为5%～10%,而三号岩体的地壳混染程度高达35%。三个岩体的地壳混染程度与岩体中硫化物的含量呈正相关关系,表明地壳混染是导致白马寨岩体硫化物饱和的主要因素。

引用

页码：332 / 343

页数：12

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