青海玉树赵卡隆铁铜多金属矿床地质特征及成因探讨  

Geology and Metallogenesis of the Zhaokalong Iron-Copper-Polymetallic Ore Deposit in Yushu,Qinghai Province

作　　者：李欢[1] 奚小双[1] 吴城明[1] 狄春霞 

机构地区：[1]中南大学地质研究所,湖南长沙410083 [2]有色金属华东地质勘查局805队,江苏南京211500

出　　处：《地质与勘探》2011年第3期380-387,共8页Geology and Exploration

基　　金：国家自然科学基金资助项目(项目编号:40372099);高等学校博士学科点专项科研基金(编号:20110162110054)资助

摘　　要：赵卡隆铁铜多金属矿床产于三叠纪末期江达弧后裂谷热水沉积盆地中,具有铁、铜、金、铅锌等多金属矿化。矿体赋存于三叠系巴塘群上部碎屑岩组上岩性段地层中,严格受地层和岩性控制。各矿(体)群根据矿体分布部位不同划分为若干条矿体。火山喷发活动(安山岩)为成矿提供了物质来源和热源,同期火山岩具有富铝钠质低钾质特征,属安山岩类-拉斑玄武岩类,具有岛弧安山岩特征,但化学分析数据同时反映其岩浆源深度较大,具有弧后扩张裂谷带特征。从矿床的产出环境、火山岩的分类、矿体的结构特征、矿石的产出形式来看,初步认为该矿床属于海底喷流的氧化铁-硫化物型铁铜多金属矿床。The Zhaokalong iron-copper-potymetallic deposit was produced in the back-arc rift sedimentary basin during the late Triassic,with mineralization of iron, copper, gold,lead, zinc and other metallic ores. Ore bodies lie in the clastic rock of the upper Batang Group of Triassic, strictly controlled by the stratigraphy and lithology. The ore（body） group is divided into several different belts according to the ore body distribution. Volcanic en^ptions（ an- desite） provided the material sources and heat for the mineralization. Volcanic rocks in the same period have the characteristics of high Al-Na and low K, and belong to the andesite-tholciite type. It has the characteristics of island arc andesite,but the chemical analysis of the data reveals the greater depth of magma source,implying that it was also associated with a back-arc spreading rift zone. According to the generation environment of the deposit, the classification of volcanic rocks, structural characteristics of ore bodies and the ore occurrence form,it can be preliminarily concluded that this deposit is an iron ox- ide-sulfide iron-copper-polymetallic deposit related to seafloor exhalation.

关 键 词：铁铜多金属矿床 裂谷 安山岩 赵卡隆 三江成矿带北段 

分 类 号：P618.51[天文地球—矿床学]