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

    Abstract:

    “Jiaodong type” gold deposit is related to the layered magmatic activity of the crust remelting and the magmatic activity which is resulted from the mix of the crust and mantle. It has unique metallogenic condition and mineralization related to layered magmatic, and represents different types due to the different structural position and ore-storage structure in the ore-forming, including altered tectonite-type and quartz vein type, etc. The Linglong granite is the product of crustal magma source, Multi-material sources of layered rock formed by long-term high temperature, high pressure and repeatedly melting, thus forming the precipitated high-temperature alkaline hydrothermal dissolving gold. The detachment belt tend to be easily formed at the edge of rock mass in the process of consistent rising after diagenesis, which therefore leads to brittle fractures that are metallogenic structural plane in rock mass, and the ore-bearing hydrothermal was gradually concentrated in metallogenic structural plane during the evolution. The later crust-mantle mixed magma, referred as Guojialing granodiorite, intruded into and then uplifted together with Linglong layered granite, resulting to the metallogenic structural plane further expanded in the vicinity of Guojialing granodiorites, finally resulted in ore fluid concentration further increased that might lead to the formation of gold ore bodies when rose to a specific depth. Remelted Linglong layered rock is the metallogenic fundamental geological body, and Guojialing granodiorite strengthened the mineralization of gold mine, which are the metallogenic geological body. The understanding shows a very good guidance for regional metallogenic prediction, inferring that new large detachment belt is gold mine centralized mineralization zone which could be major breakthroughs in the future.

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田杰鹏,田京祥,郭瑞朋,韦昌山,王立功,于晓卫,李秀章,黄永波,张春池,刘汉栋,祝培刚.2016.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[J].地质学报,90(5):987-996.
TIAN Jiepeng, TIAN Jingxiang, GUO Ruipeng, WEI Changshan, WANG Ligong, YU Xiaowei, LI Xiuzhang, HUANG Yongbo, ZHANG Chunchi, LIU Handong, ZHU Peigang.2016. Jiaodong-Type Gold Deposit Related to Crust Source Remelting Layered Granite and Crust-Mantle Mixed Granodiorite[J]. Acta Geologica Sinica,90(5):987-996.

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  • 收稿日期:2016-04-12
  • 最后修改日期:2016-04-20
  • 录用日期:2016-04-21
  • 在线发布日期: 2016-05-18
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