西昆仑北缘库科西力克钼矿床地质特征及矿床成因浅析  

The Geological Feature and Genesis Analysis of the Kukexilike Molybdenum Deposit in Northern Margin of the West Kunlun

作　　者：黄建国[1] 陈廷方[1] 李文杰[1] 朱余银[1] HUANG Jianguo;CHEN Tingfang;LI Wenjie;ZHU Yuyin(Shool of Environment and Resource,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China)

机构地区：[1]西南科技大学环境与资源学院,四川绵阳621010

出　　处：《西南科技大学学报》2023年第1期47-53,共7页Journal of Southwest University of Science and Technology

基　　金：四川矿产资源研究中心资助项目(SCKCZY2016-ZC05);西南科技大学博士基金(14zx7126)。

摘　　要：西昆仑北缘库科西力克钼矿床是区域内较为典型的矿床之一,矿体主要赋存于卡拉库鲁木复式岩体(γS)边缘接触带变质岩地层(中元古代长城系赛图拉岩组下段(Chst^(1)))中,受矽卡岩化蚀变带的控制,矽卡岩矿物主要为石榴子石和透辉石。该矿矿种相对较为单一,矿石矿物主要有辉钼矿、黄铁矿和黄铜矿等,矿石钼品位较高,一般Mo的质量分数为0.03%~5.20%,平均2.60%。钼矿石的稀土元素总含量(质量分数)变化较大(25.2×10^(-6)~130×10^(-6)),可能与矿石的类型(粉末状或块状)有关,δ_(Eu)为0.38~0.61,δ_(Ce)为0.99~1.01,显示出成矿条件可能处于还原到弱还原环境。含矿岩系的稀土元素含量及配分模式反映出成矿元素并非直接来源于围岩或志留纪的侵入岩体,可能主要来源于卡拉库鲁木复式岩体(γS)的晚期(三叠纪)岩石,属于印支期岩浆热液成矿的产物,成因上总体属于矽卡岩型矿床,与区域上大同一带加里东期的钼矿床存在明显的差异。The Kukexilike Molybdenum deposit in northern margin of the West Kunlun is one of the typical deposits in the region.The ore body mainly occurs in metamorphic strata(lower segment of Saitula Formation,Mesoproterozoic’s Changcheng system(Chst^(1)))in the adjacent edge contact zone of Kalakulumu compound rock mass(γS).The deposit is controlled by the skarn alteration zone,and skarn minerals are mainly pomegranate seed and diopside.The ore type is relatively single,and there are mainly molybdenite,pyrite and chalcopyrite.The molybdenum grade of the ore is high,and Mo content is generally from 0.03%to 5.20%,with an average of 2.60%.Total rare earth element amount(∑REE,mass fraction)of molybdenum ore body varies greatly(25.2×10^(-6)-130×10^(-6)),which may be associated with the type of ore(powder or block).δ_(Eu)varies from 0.38 to 0.61 andδ_(Ce)ranges from 0.99 to 1.01,indicating that the ore-forming condition may be in the reducing to weak reducing environment.The content of rare earth elements of ore bearing rock series and its distribution pattern reflect that ore-forming elements are not directly derived from surrounding rock or Silurian intrusive rock,but may mainly come from late(Triassic)rocks of Kalakulumu compound rock mass(γS),which belongs to the product of Indosinian magmatic hydrothermal mineralization.And the genesis of ore deposit is generally skarn deposit,which is obvious different from the Caledonian molybdenum deposits in Datong area.

关 键 词：西昆仑北缘 库科西力克钼矿 矽卡岩 印支期 卡拉库鲁木复式岩体 

分 类 号：P618.65[天文地球—矿床学]