新疆奇台县托吐喀腊地区基性杂岩体地质、地球化学特征及铜镍成矿作用  

Geological and Geochemical Characteristics and Cu-Ni Mineralization of the Basic Complex in Tuotukala area,Qitai County,Xinjiang

作　　者：严晓琴 肖艳东 王君良 陈梦婷 汤贺军 范侥 赵玉京 Yan Xiaoqin;Xiao Yandong;Wang Junliang;Chen Mengting;Fan Yao;Tang Hejun;Zhao Yujing(Xinjiang Geological Survey Institute,Urumqi,Xinjiang,830000,China;Chinese Academy of Geological Sciences,Beijing,100037;Xinjiang University,Urumqi,Xinjiang,830046,China)

机构地区：[1]新疆维吾尔自治区地质调查院,新疆乌鲁木齐830000 [2]中国地质科学院,北京100037 [3]新疆大学,新疆乌鲁木齐830046

出　　处：《新疆地质》2023年第2期189-196,共8页Xinjiang Geology

摘　　要：准噶尔东北缘北塔山地区分布有4处基性杂岩体,与铜镍成矿作用密切相关。杂岩体呈带状展布,受NW向断裂及次级断裂控制,具7个岩相带,为晚石炭世后岩浆活动产物。含矿岩体具高镁、低铝、低钙、低钛,贫铌,富集轻稀土元素等特征。m/f比值介于1.05~3.63,属铁质系列,对铜镍矿形成有利。杂岩体地质地球化学特征指示,成矿岩浆上升过程中发生了结晶分异和地壳混染,后者对岩浆中金属硫化物的熔离和富集起重要促进作用。托吐喀腊地区6条铜镍矿体呈透镜状、板状、脉状,成矿过程可划分为3个成矿期和4个成矿阶段:岩浆成矿期(岩浆熔离成矿阶段和岩浆末期贯入成矿阶段)、热液成矿期(包括热液叠加阶段)和表生成矿期(包括表生氧化淋滤阶段),矿区不同成矿作用形成相应的矿化、蚀变特征,可为寻找铜镍矿床提供线索。There are 4 basic complex bodies in Beitashan area,northeastern margin of Junggar,which are closely relat-ed to cu-ni mineralization.The complex,which is controlled by nw-trending faults and their secondary faults,has 7 litho-facies zones and is the product of magmatic activity after Late Carboniferous.The ore-bearing rock mass is characterized by high MG,low AL,Low Ca,low TI,low NB and rich light rare earth elements.The ratio of M/F is between 1.05 and 3.63.It belongs to Ferric series,which is favorable to the formation of cu-ni ore.The geological geochemistry of the complex indicates that crystallization differentiation and crustal contamination occurred during the ascent of the metallogenic magma,and the latter played an important role in the melting and enrichment of metal sulphides in the magma.Six cop-per-nickel ore bodies in totukala area are lenticular plate-shaped and vein-shaped,the metallogenic process can be divid-ed into three metallogenic stages and four metallogenic stages:magmatic metallogenic stage-LRB-magmatic detach-ment metallogenic stage and magmatic late intrusive metallogenic stage,hydrothermal metallogenic stage(including hydrothermal superimposed stage)and supergene metallogenic stage(including supergene oxidation leaching stage),the corresponding mineralization and alteration characteristics formed by different mineralization in the ore area can provide clues for the prospecting of cu-ni deposits.

关 键 词：东准噶尔北缘 北塔山 托吐喀腊 杂岩体 岩石地球化学 铜镍矿 

分 类 号：P618.41[天文地球—矿床学] P618.63[天文地球—地质学]