新疆东天山觉罗塔格带中康古尔金矿床成因的再认识  

Re-understanding genesis of Kanggur gold deposit in Jueluotage Belt,East Tianshan Mountains,Xinjiang

作　　者：杜尚泽 张元厚[1] 杨万志 文斌 王鹏 DU ShangZe;ZHANG YuanHou;YANG WanZhi;WEN Bin;WANG Peng(College of Earth Sciences,Jilin University,Changchun 130061,Jilin,China;Xinjiang Institute of Geological Survey,Urumqi 830000,Xinjiang,China)

机构地区：[1]吉林大学地球科学学院,吉林长春130061 [2]新疆地质矿产调查院,新疆乌鲁木齐830000

出　　处：《矿床地质》2020年第6期1103-1121,共19页Mineral Deposits

基　　金：新疆维吾尔自治区地质勘查基金管理中心项目(编号:Y14-5-LQ05)资助。

摘　　要：东天山觉罗塔格构造带中康古尔金矿因其独特的成矿地质特征,成因一直备受争议。文章立足于康古尔金矿地质特征,结合前人的研究资料,通过探讨觉罗塔格带的构造演化,重新审视康古尔金矿的成因。笔者总结了觉罗塔格构造带晚古生代地层时代及火山-沉积建造特征,认为晚古生代早期大洋板块向北俯冲,发育奥陶纪—泥盆纪弧火山岩及火山-沉积岩系,石炭纪康古尔洋发生双向洋-陆俯冲,在两侧形成对称岛弧带,局部平稳拉张环境为铜-铅-锌-金成矿的有利环境。野外地质观察及室内研究结果表明其成因不仅仅与韧性剪切作用有关。康古尔金矿体位于海相安山岩、凝灰岩的交替部位,上部富金-中部铅锌-下部富铜的金属分带特征,与VMS矿床特征一致。矿体呈板状且与围岩截然接触,明显受挤压变形的网脉状矿化表明矿体形成早于韧性剪切作用。矿床地球化学特征表明,康古尔金矿成矿作用具有多期多阶段性。通过详细对比康古尔金矿和造山型金矿、小热泉子VMS铜矿的特征,笔者认为康古尔金矿具有原生VMS矿床的特征,并且被二叠纪韧性变形所改造,为喷流沉积-变质热液改造型富金多金属矿床。The Kanggur gold deposit in Jueluotage tectonic belt of the East Tianshan Mountains is characterized by its unique metallogenic geology,and its origin has long been controversial.In this study,based on the geological characteristics of the Kanggur gold deposit in combination with the previous research data,the authors reexamined the genesis of the Kanggur gold deposit by discussing the tectonic evolution of the Jueluotage belt,and summarized the Late Paleozoic stratigraphic age and volcanic-sedimentary formation characteristics of the Jueluotage tectonic belt.In the early late Paleozoic,the oceanic plate subducted northward and developed Ordovician-Devonian arc volcanic rocks and volcanic sedimentary rocks.Bidirectional subduction of the Kanggur Ocean occurred in the Carboniferous and formed symmetrical island arc belts on both sides.The local stable tension environment was favorable for copper-lead-zinc-gold mineralization.Field geological observation and laboratory research result show that its genesis was not only related to ductile shearing.The Kanggur gold deposit is located in the alternate position of sea facies andesite and tuff,with the metallic zonation features of rich gold in the upper part,lead and zinc in the middle part and rich copper in the lower part,consistent with the characteristics of VMS deposit.The orebody is platy and in clear contact with surrounding rocks,and the stockwork mineralization which was obviously extruded and deformed show that the primary orebody was formed earlier than ductile shear action.The geochemical characteristics of the deposit indicate that the Kanggur gold mineralization underwent multiple stages.By comparing the characteristics of Kanggur gold deposit,orogenic gold deposit and Xiaorequanzi VMS copper deposit in detail,it is considered that Kanggur gold deposit has the characteristics of a primary VMS deposit and was transformed by Permian ductile deformation.It is a rich gold polymetallic deposit characterized by an early volcanic exhalative sedimentation and lat

关 键 词：地质学 VMS矿床 含矿建造 矿床成因 康古尔金矿 觉罗塔格带 东天山 

分 类 号：P618.51[天文地球—矿床学]