西天山喀英迪铁铜矿床地球化学特征及构造环境探讨  

Geochemical characteristics and construction environment of the Kayingdi iron-copper deposit in the West Tianshan

作　　者：龚光林 杨航 曹景良[1] GONG Guanglin;YANG Hang;CAO Jingliang(Hunan Geological Exploration Insitute of China Metallurgical Geology Bureau,Changsha 410016,Hunan,China)

机构地区：[1]中国冶金地质总局湖南地质勘查院,湖南长沙410016

出　　处：《矿产与地质》2018年第6期1016-1026,共11页Mineral Resources and Geology

基　　金：中央地勘基金项目"新疆西天山成矿区铜金多金属矿勘查"(编号:2009651003)资助

摘　　要：喀英迪铁铜矿床位于新疆西天山成矿区博罗科努成矿带中部,矿床的形成与泥盆世早期呼斯特大型复式岩体相关,矿区侵入岩为呼斯特岩基的分支岩株、岩枝,即为二长花岗岩、花岗闪长岩。岩石主量元素特征反映出高钾钙碱性过铝质混源序列花岗岩;岩石稀土总量偏低,LREE/HREE=8. 59～10.59,平均为9. 84,属轻稀土相对富集,(La! Yb)N=9. 53～10. 39,反映了岩石稀土分馏明显,δEu值为0. 29～0. 63,均小于1,具有中等-较强的铕负异常。R1-R2多阳离子参数构造判别图显示,呼斯特花岗岩的形成主要经历板块碰撞前、同碰撞期及后碰撞三个阶段,与板块构造碰撞造山有着密切关系,结合Fw-Mw和Nb-Y构造判别图,矿区构造背景应为板块汇聚阶段的岛弧造山带。The Kayingdi iron-copper deposit is located in the central part of the Borokunu metallogenic belt in the western Tianshan metallogenic area,Xinjiang.The formation of the deposit is related to the large complex rock mass of Husite in the Late Devonian.The intrusive rocks in the mining area,i.e monzonitic granite and granodiorite,are output in stocks,they are branches of Husite batholith.The major element characteristics of the rock suggested that the granite belongs to the high potassium calcium alkaline peraluminous mixed source sequence granite;the total rare earth element content of the rocks is relatively low,LREE/HREE=8.59-10.59,averaging 9.84,belonging to the relative enrichment of light rare earth element,(La/Yb)N=9.53-10.39,reflecting the distillation of rare-earth in the rocks is obvious,and the delta Eu value is 0.29-0.63,all less than 1,with medium-strong negative europium anomaly.R1-R2 multi-cation parameter tectonic discriminant map shows that the formation of Husite granite mainly undergoes three stages:pre-collision,co-collision and post-collision,which are closely related to plate tectonic collision orogeny.Combining Fw-Mw and Nb-Y tectonic discriminant map,the tectonic setting of the mining area should be island arc orogenic belt in the stage of plate convergence.

关 键 词：铁铜矿床 呼斯特岩体 岩石地球化学 岛弧造山带 喀英迪 西天山 

分 类 号：P618.31[天文地球—矿床学] P618.41[天文地球—地质学]