胶东型金矿：与壳源重熔层状花岗岩和壳幔混合花岗闪长岩有关的金矿  

Jiaodong-Type Gold Deposit Related to Crust Source Remelting Layered Granite and Crust-Mantle Mixed Granodiorite

作　　者：田杰鹏 田京祥[3] 郭瑞朋[3] 韦昌山[2] 王立功[3] 于晓卫[3] 李秀章[3] 黄永波[3] 张春池[3] 刘汉栋[3] 祝培刚[3] 

机构地区：[1]中国地质大学(北京),北京100083 [2]中国地质科学院地质力学研究所,北京100081 [3]山东省地质调查院,济南250013

出　　处：《地质学报》2016年第5期987-996,共10页Acta Geologica Sinica

基　　金：国土资源部公益行业科研专项(编号201411024);中国地质调查局项目(编号1212010813014、12120114034901);山东省地质勘查项目(编号[2014]-7)资助的成果

摘　　要：胶东型金矿是与壳源重熔形成的层状岩浆活动和壳幔混合岩浆活动有关的金矿床,由于成矿时所处构造位置和容矿构造不同而表现为不同的类型,涵盖破碎带蚀变岩型、石英脉型等胶东地区所有金矿床类型。玲珑花岗岩是壳源物质长期处于高温高压下且熔融形成的多物质来源层状岩体,其析出的高温碱性热液溶解金等成矿物质形成初始含矿热液。岩体抬升过程中在其边部往往容易形成拆离带,在岩体中形成脆性断裂构造,均为成矿结构面。后期壳幔混合成因的郭家岭花岗闪长岩,侵入于玲珑层状花岗岩中并一起隆升,使郭家岭花岗闪长岩附近区域的成矿结构面进一步扩大,矿液浓度进一步增大,当上升到特定深度时形成金矿体。玲珑花岗岩和郭家岭花岗闪长岩共同构成成矿地质体,重熔的玲珑层状岩体是成矿基础地质体,郭家岭花岗闪长岩加强了金矿的成矿作用。该认识对开辟胶东新的找矿思路和找矿靶区有很好的指导作用,据此初步预测新的大型拆离带是金矿集中成矿区域,可能成为将来有望取得重大突破的矿集区。Jiaodong-type gold deposit refer to the gold deposits related to the layered magmatic activities of the crust remelting and crustal-mantle mixing magma,which show different deposit types in response to their structural positions and ore hosting structure.The gold deposits of this kind contain altered tectonite-type and quartz vein type,etc.The Linglong granite was multiple sourced layered rock mass resulting from melting of crustal magma source under the long-term high temperature and high pressure. Hightemperature alkaline hydrothermal fluid contained gold to constitute early gold-bearing metallogenic fluid.During the consistent uplifting process of the rock mass after diagenesis,the detachment belt tended to form along the edge of rock mass,therefore leading to formation of brittle fractures and metallogenic structural plane in rock mass.The Guojialing granodiorite,which formed from the late-stage crust-mantle mixed magma,intrudes into the Linglong granite and then uplifted.This resulted in further expansion of the metallogenic structural plane in the vicinity of the Guojialing granodiorites and increasing of fluid concentration,finally leading to the formation of gold ore bodies when the granodiorite reached a specific depth.Layered Linglong granite and Guojialing granodiorite jointly constitute the metallogenic geological body,with the former being the fundamental host rock and the latter increasing gold mineralization.The understanding provides good guidance for thinking and targeting of deposit exploration in the Jiaodong area.On the basis of this study,it can be predicted that the new large detachment belt is gold mineralization clustered zone,which could be major breakthrough in the future.

关 键 词：胶东成矿区 胶东型金矿 玲珑花岗岩 郭家岭花岗闪长岩 层状花岗岩 

分 类 号：P618.51[天文地球—矿床学]