| 胶东昆嵛山花岗岩的特征、成因及其与金矿的关系 |
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| 引用本文： | 徐洪林,张德全,孙桂英.胶东昆嵛山花岗岩的特征、成因及其与金矿的关系[J].岩石矿物学杂志,1997,16(2):131-143. |
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| 作者姓名： | 徐洪林 张德全 孙桂英 |
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| 作者单位： | 中国地质科学院地质研究所 |
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| 摘 要： | 昆嵛山花岗岩是牟平—乳山金矿成矿带的围岩，在其成因和定位时代上长期存在争议。本文对岩体地质和地球化学特征进行了系统研究，并就岩体成因及其与金矿的关系进行了讨论。作者认为，昆嵛山花岗岩是在中生代由岩浆缓慢冷凝结晶形成的大型复式岩基，并非交代成因。它由垛崮顶片麻状花岗闪长岩（１４７Ｍａ）、八门邹家斑状花岗闪长岩（１３５Ｍａ）、瓦善—水道弱片麻状二长花岗岩及五爪山片麻状含榴二长花岗岩（１２０Ｍａ）组成，成分具贫铝富碱的特点。岩浆来源于中下地壳中酸性变质火山岩系部分熔融形成的岩浆，其形成温度为６５０—７５０℃。岩体经历了韧性和脆性变形作用，不同方向的片麻状构造是岩浆结晶期韧性变形作用的结果。脆性变形形成的断裂和破碎带是本区主要的导矿和容矿构造。花岗岩定位、韧和脆性变形作用与金矿成矿作用有十分密切的关系
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| 关 键 词： | 花岗岩 地质地球化学及成因 金矿 昆嵛山 胶东 |
Characteristics and Genesis of Kunyushan Granite and Its Relation with Gold Deposits in Jiaodong |
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| Xu Honglin,Zhang Dequan,Sun Guiying.Characteristics and Genesis of Kunyushan Granite and Its Relation with Gold Deposits in Jiaodong[J].Acta Petrologica Et Mineralogica,1997,16(2):131-143. |
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| Authors: | Xu Honglin Zhang Dequan Sun Guiying |
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| Abstract: | Kunyushan granite distributed in Muping-Rushan area of Jiaodong is a multiphasic gnessic complex intrusion. It is composed of Duoguding gneissic granodiorite (147 Ma), Bamenzhoujia gneissic porphyritic granodiorite (135 Ma), Washan-Shuidao monzonitic granite and Wuzhaoshan gneissic garnetiferous monzonitic granite (120 Ma), and is geochemically characterized by poor aluminium and rich alkali. According to our work, it was emplaced mainly in Jurassic and, instead of being formed by metasomatism, was formed by condensated crystallization from magma derived from melting of Proterozoic intermediate acid metamorphosed volcanic rocks situated in the lower middle crust or the upper part of the lower crust, as a result of sudden decrease in pressure and temperature in the pliable lower crust. The granite was formed by crystallization and later it underwent plastic and brittle deformation. The different directions of gneissosity of the intrusion resulted from plastic deformation of melt as a result of different directions of stress. Faults and shatter zones formed by brittle deformation constitute the main passageways and host structures. There is a close relation between the emplacement and deformation of granite and the ore forming process of the gold deposits. In the process of brittle deformation of the intrusion, the silica rich hydrothermal solution crystallized and the recrystallization of quartz provided the carrier (quartz veins) for the concentration of mineralized materials. The main ore forming solution was the mixture of deep source auriferous hydrothermal solution and heated circulated groundwater. It extracted gold from metamorphic rocks, granite and lamprophyre, and caused its mobilization, migration and enrichment to form gold orebodies. |
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| Keywords: | granite geology geochemistry and genesis gold deposit Kunyushan Jiaodong |
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