陕西毕机沟钒钛磁铁矿床铂族元素地球化学特征及其意义  

Geochemical characteristics of platinum group elements of Bijigou V-Ti magnetite deposit in Shaanxi Province and its significance

作　　者：成来顺 CHENG Laishun(Shaanxi Metallurgical and Mining Group Co.,Ltd.,Xi’an,Shaanxi 710075 China)

机构地区：[1]陕西有色冶金矿业集团有限公司,陕西西安710075

出　　处：《矿产与地质》2017年第6期1072-1076,共5页Mineral Resources and Geology

基　　金：陕西省地勘局项目(编号:61201405267)资助;陕西有色冶金矿业集团有限公司重点项目

摘　　要：位于扬子地块北缘的毕机沟钒钛磁铁矿床是我国西北地区主要的岩浆型铁矿床。毕机沟钒钛磁铁矿床岩石及矿石的铂族元素(PGE)化学研究表明,该矿床PGE分异明显,出现铂和钯的轻度富集。推测该区基性-超基性岩形成于硫不饱和拉斑玄武质岩浆的演化,主要成矿作用为熔离分异。但拉斑玄武质岩浆上升侵位过程中,存在岩浆硫饱和,导致硫化物熔离,残余岩浆中PGE亏损,PGE成矿作用不发育。The Bijigou V-Ti magnetite deposit is the main magmatic iron deposit,which is located in the north edge of Yangzi Plate in the northwest China.The research of ore geochemical characteristics of platinum elements of the deposit shows that the PGE differentiation is obvious and Pt and Pd are enriched relatively.It is speculated that the basic-ultrabasic rocks in this area are formed in the evolution of tholeiitic basalt magma with unsaturated sulfur,and the main metallogenic process is melting and separation.However,the sulfur saturation of magma leads to the sulfide melting and separation during the ascending emplacement of tholeiitic basalt magma.The mineralization of PGE is not developed for the PGE elements are depleted in the residual magma.

关 键 词：毕机沟钒钛磁铁矿 铂族元素 地球化学特征 岩浆型 熔离分异 陕西 

分 类 号：P618.31[天文地球—矿床学] P595[天文地球—地质学]