东天山香山铜镍硫化物矿床铂族元素地球化学特征及其意义  

Platinum Group Elements Geochemistry and Its Implication for the Xiangshan Cu-Ni Sulfide Deposit,East Tianshan,China

作　　者：肖凡[1] 王敏芳[1,2] 姜楚灵[1,3] 杨武胜[1] 

机构地区：[1]中国地质大学 资源学院 [2]中国地质大学 地质过程与矿产资源国家重点实验室,武汉430074 [3]长沙矿冶研究院有限责任公司,长沙410012

出　　处：《地质科技情报》2013年第1期125-132,138,共9页Geological Science and Technology Information

基　　金：国家自然科学基金面上项目(41272097),国家自然科学基金青年科学基金(40902026);中国地质调查局计划项目(1212011085466);地质过程与矿产资源国家重点实验室开放课题(GPMR201006);中央高校基本科研业务费专项资金(CUG120702)

摘　　要：香山含铜镍矿岩体位于东天山北部的土墩-图拉尔根镁铁-超镁铁岩带中段,受康古尔塔格-黄山深大断裂控制,为由辉长岩、辉橄岩、细粒辉长岩和钛铁辉长岩组成的复式岩体。香山铜镍矿床岩石铂族元素总量(∑PGE)变化范围为0.74×10-9～2.82×10-9,矿石∑PGE变化范围为20.64×10-9～148.99×10-9,PPGE(Pd、Pt)和IPGE(Ru、Ir、Os)之间分异均较弱,二者具有相似PGE原始地幔标准化配分曲线形式。香山铜镍矿床原生岩浆w(MgO)下限值为4.97%,源于亏损型地幔,PGE丰度较高,母岩浆为高镁玄武质岩浆,PGE处于亏损状态且亏损的原因是发生了硫化物熔体不混溶作用,引发硫饱和的机制为地壳物质同化混染作用,以及橄榄石、辉石和基性斜长石等矿物的结晶分离作用。The Xiangshan Cu-Ni sulfide deposit is a multiple ore-bearing intrusion and composes of gabbro, pyroxene peridotite, aplitic gabbro and Ti-Fe gabbro, which is located in the centre segment of Tudun-Tu- laergen mafie-ultramafie rock belt, the northern of the East Tianshan, and controlled hy the Kangurtag- Huangshan ductile sheer zone. The rocks and ores in Xiangshan Cu-Ni deposit, with similar mantle-nor- malizaed PGE patterns and fractionation between PPGE and IPGE, which range from 0.74× 10^-9 -2.82 × 10^-9 and 20.64× 10^-9-148.99× 10.9 in ∑ PGE respectively. The initial magma of Xiangshan Cu-Ni de- posit is high MgO （≥4.97%） and undepleted PGE, which originated from the depleted mantle. But the parental magma is visibly depleted in PGE, possibly due to sulfide immiscibility during the ascent and the main factors include crustal contamination and fractionation of olivine, pyroxene and plagioclase.

关 键 词：香山 铜镍矿床 PGE 硫化物熔离作用 

分 类 号：P618.5[天文地球—矿床学]