蒙西斑岩铜钼矿床成矿阶段及成矿元素统计分析意义  

METALLOGENIC STAGE AND STATISTICAL SIGNIFICANCE OF ORE-FORMING ELEMENTS OF MENGXI PORPHYRYCU-MO DEPOSIT,EASTERN JUNGGAR

作　　者：肖鸿[1,2] 魏俊浩[1] 梁广林[2] 张征峰[2] 吴慧平[2] 赵富庄[2] 闫西林[2] 徐兴旺[3] 

机构地区：[1]中国地质大学(武汉)资源学院,湖北武汉430074 [2]新疆维吾尔自治区地质矿产勘查开发局第一地质大队,新疆昌吉838800 [3]中国科学院地质与地球物理研究所,中国科学院矿产资源研究重点实验室,北京100029

出　　处：《新疆地质》2010年第4期427-433,共7页Xinjiang Geology

基　　金：教育部创新团队发展计划(IRT0755);“十一五”国家科技支撑计划重点项目(2006BAB07B01-03);中国科学院知识创新工程主要方向项目(KZCX2-YW-107)联合资助

摘　　要：蒙西斑岩铜钼矿位于东准噶尔北塔山-纸房-琼河坝岛弧带东段琼河坝地区,属形成于断裂背景下的斑岩型矿床.脉状矿化是该矿床主要矿化类型,不同脉体有一定生成顺序.早期钾化阶段形成磁铁矿钾长石石英脉、硫化物钾长石石英脉、及高温阶段磁铁矿碳酸盐脉.进入硅化作用阶段后,形成磁铁矿石英脉、辉钼矿石英脉、黄铜矿黄铁矿石英脉、黄铁矿石英脉及少硫化物石英脉.成矿作用后期形成不含或少含硫化物的石英脉、碳酸盐脉.结合矿化蚀变带内地化元素的聚类分析、因子分析特征,初步将蒙西铜钼矿成矿作用分为早期构造挤压作用成矿期和岩浆热液作用成矿期.岩浆热液成矿期是该矿床的主要成矿时期,可细分为高温成矿阶段和中低温成矿阶段,分别对应形成Mo,Cu的富集矿化.Mengxi porphyry Cu-Mo deposit is located at eastern segment of the Beitashan-Zhifang-Qiongheba arc belt in the Qiongheba area,eastern Junggar.It was strongly controlled by fault patterns.The ores are dominated by vein type.Different veins formed in an evident sequence.In the early potassic alternation stage,magnetite-feldspar quartz veins,sulphide-potassium feldspar quartz veins,and magnetite carbonate veins are chief ones formed in high temperature.In the following silicification stage,magnetite quartz veins,molybdenite quartz veins,chalcopyrite-pyrite quartz veins,pyrite quartz veins with subordinate sulfide quartz veins are dominant.Quartz and carbonate veins containing no or less sulfides are the latest hydrothermal productions during the metallogenesis.On basis of mineralizing features,interaction relationships among veins,formation sequence of veins,and enrichment characters of geochemical elements in the alteration zone,mineralization of the Mengxi deposit can be subdivided into two main stages,including the earlier period related to tectonic compression and the later magmatic hydrothermal mineralization.The magmatic hydrothermal mineralization was the major event containing high-temperature Mo mineralization and mesothermal Cu mineralization.

关 键 词：蒙西铜钼矿床 成矿阶段 矿化脉体 聚类分析 因子分析 

分 类 号：P618.41[天文地球—矿床学]