胶东地区中生代花岗岩年代学、地球化学特征及与金银多金属成矿的关系  

Chronology and geochemical characteristics of Mesozoic granites in Jiaodong area and their relationship with gold silver polymetallic mineralization

作　　者：赵立翔 丁正江 张琪彬 范家盟 滕嘉文 孙金磊 钱烨 Zhao Lixiang;Ding Zhengjiang;Zhang Qibin;Fan Jiameng;Teng Jiawen;Sun Jinlei;Qian Ye(Shandong Provincial Engineering Laboratory of Application and Development of Big Data for Deep Gold Exploration;College of Earth Sciences,Jilin University;Institute of Geochemistry,Chinese Academy of Sciences)

机构地区：[1]山东省深部金矿探测大数据应用开发工程实验室 [2]吉林大学地球科学学院 [3]中国科学院地球化学研究所

出　　处：《黄金》2024年第4期57-64,共8页Gold

基　　金：山东省深部金矿探测大数据应用开发工程实验室开放课题(SDK202203);国家重点研发计划项目(2018YFC0603800)。

摘　　要：胶东地区不仅是中国东部中生代大规模矿产形成的关键区域之一,同时也是中国东部岩浆岩带的一个重要组成部分。中生代花岗岩主要划分为晚侏罗世玲珑期(147~162 Ma)、早白垩世早期郭家岭期(125~133 Ma)、早白垩世晚期伟德山期(110~123 Ma)和崂山期(110~118 Ma)。玲珑期花岗岩为地壳重熔S型岩石,源区物质主要为古元古代荆山群、粉子山群和太古代TTG片麻岩系;郭家岭期花岗岩为高w(Ba)/w(Sr)值花岗岩,伟德山期花岗岩为I型花岗岩,二者均为壳幔混合成因;崂山期花岗岩为地壳重熔A型花岗岩。金银多金属矿成矿时代主要为早白垩世,接近伟德山期花岗岩;在空间上,金矿床主要赋存在玲珑期花岗岩和郭家岭期花岗岩内;金银多金属矿成矿物质均具明显地幔来源特征,与伟德山期花岗岩具有密切联系,上地幔在胶东地区中生代成岩成矿作用的贡献主要通过幔源C-H-O流体活动实现。含金幔源C-H-O流体在进入地壳后发生分异作用,分异后的流体在上升到一定高度后,随着温度的不断降低和大气水的不断加入而发生成矿作用,在岩体内外适当部位形成金银多金属矿,在岩体外部适当部位形成蚀变岩型、脉型等金矿。Jiaodong area is one of the important regions of Mesozoic large-scale mineralization and an important part of the magmatic belt in eastern China.The Mesozoic granites are mainly divided into the Late Jurassic Linglong Stage(147-162 Ma),Early Cretaceous Guojialing Stage(125-133 Ma),Late Early Cretaceous Weideshan Stage(110-123 Ma)and Laoshan Stage(110-118 Ma).Linglong granite is crustal remelting S-type rock,and the source of materials is mainly Paleoproterozoic Jingshan Group,Fenzishan Group and Neoarchean TTG gneiss;Guojialing granite is high w(Ba)/w(Sr)granite and Weidershan granite is I-type granite,both of which are derived from crust-mantle mixing;Laoshan granite is crustal remelting A-type granite.The gold and polymetallic mineralization is mainly formed in the Early Cretaceous,which is consistent with the Weideshan granite;spatially,the Linglong granite and Guojialing granite are the most important enclosing rocks of the gold deposits;the metallogenic materials of the gold silver polymetallic deposits are characterized by obvious mantle origin,which is closely related to the Weideshan granite,and the upper mantle's contribution to Mesozoic petrogenesis and metallogeny of the Jiaodong area is mainly realized through the mantle source C-H-O fluid activity.Differentiation occurs after the gold-bearing mantle source C-H-O fluid enters into the crust.When the fluid after the differentiation rises to a certain height,with the continuous lowering of the temperature and the continuous addition of atmospheric water,mineralization occurs and gold silver polymetallic deposits in the rock body or the appropriate parts outside and altered rock-type,vein-type and other gold deposits in appropriate parts outside of the rock body.

关 键 词：中生代 花岗岩 岩石成因 成岩成矿关系 构造背景 胶东地区 

分 类 号：TD11[矿业工程—矿山地质测量] P618.51[天文地球—矿床学]