胶东金矿与中生代区域性花岗岩关系及成矿预测和找矿方向  

Relationship between Jiaodong Gold Deposit and Mesozoic Regional Granite Metallogenic Predication and Prospecting Direction

作　　者：王来明[1] 王金辉[1] 任天龙[1] 于晓卫[1] 张文[1] 李瑞翔 陶有兵[1] 杨振毅 王立功[1] 刘汉栋[1] 郭瑞鹏 WANG Laiming;WANG Jinhui;REN Tianlong;YU Xiaowei;ZHANG Wen;LI Ruixiang;TAO Youbing;YANG Zhenyi;WANG Ligong;LIU Handong;GUO Ruipeng(Shandong Institute of Geological Surveying,Shandong Ji'nan 250014,China;No.6 Geological Brigade of Shandong Provincial Bureau Of Geology and Mineral Resources(No.6 Exploration Institute of Geology and Mineral Resources),Shandong Weihai 264209,China)

机构地区：[1]山东省地质调查院,山东济南250014 [2]山东省地质矿产勘查开发局第六地质大队(山东省第六地质矿产勘查院),山东威海264209

出　　处：《山东国土资源》2024年第3期6-22,共17页Shandong Land and Resources

基　　金：胶西北地区金矿成矿作用研究及深部成矿预测(鲁勘字〔2021〕18号);胶东地区中生代花岗岩调查及与金矿关系研究(鲁勘字〔2018〕19号)。

摘　　要：胶东地区是世界著名的金矿资源基地,截至2023年6月已累计探明金矿资源量已达5757余吨。与金矿成矿密切的中生代花岗岩分布广泛,岩石类型多样,也是山东省最发育、最典型的地区。本文对胶东地区金矿与中生代区域性花岗岩空间展布、形成时代和形成环境等关系进行了分析研究。区域性广泛分布的中生代花岗岩为晚侏罗世玲珑期(166~146 Ma)、早白垩世早期郭家岭期(135~123 Ma)、早白垩世晚期伟德山期(123~110 Ma)和崂山期(118~108 Ma),研究认为区域性岩浆事件一般持续10 Ma左右,而重熔型花岗岩一般持续20 Ma,反映了由基底岩石熔融到侵入结晶的2个阶段,它有一个由基底固体岩石熔融的过程,大致也需要10 Ma,既固体岩石熔融10 Ma,熔浆活动上侵结晶10 Ma。玲珑期重熔型花岗岩是扬子板块和华北板块碰撞的期后产物,郭家岭期岩浆事件代表了中国东部中生代构造体制转换的开始,伟德山期岩浆事件代表了构造体制转换的高峰期,崂山期岩浆事件代表了构造体制转换的结束期。86.8%的金矿赋存在玲珑期花岗岩中,6.9%的金矿赋存于郭家岭期花岗岩中,玲珑期花岗岩和郭家岭期花岗岩Au元素背景值明显高于伟德山期花岗岩和崂山期花岗岩。矿石硫与玲珑期花岗岩、郭家岭期花岗岩范围相近,特别是与玲珑期花岗岩大范围重叠,具有岩浆热液硫同位素变化小的特点,说明矿石硫主要源为玲珑期花岗岩、郭家岭期花岗岩。矿石铅主要为再活化的下地壳铅,即前寒武纪结晶基底铅,有幔源铅加入。金矿成矿年龄有162~146 Ma、133~120 Ma、120~115 Ma、112~105 Ma共4个区间范围,与胶东地区四期区域性花岗岩形成时间对应,成矿年龄一般晚于成岩年龄3~5 Ma。根据胶东金矿及多金属矿与岩浆热液事件对应关系,划分为玲珑金成矿期、郭家岭金成矿期、伟德山金及多金属成矿期和崂山多金属成矿期。Jiaodong area is a world-renowned gold resource base.By the end of June 2023,a cumulative proven gold resource is over 5757t.The Mesozoic granites which are closely related to gold mineralization are widely distributed and have diverse rock types.It is the most developed and typical area in Shandong province.The relationship between gold deposits in Jiaodong area and the spatial distribution,formation era,and formation environment of regional granite in Mesozoic era has been analyzed and studied.The widely distributed Mesozoic granites in this area are classified as late Jurassic Linglong period(166~146Ma),early Cretaceous Guojialing period(135~123Ma),late early Cretaceous Weideshan period(123~110 Ma),and Laoshan period(118~108 Ma).It is regarded that regional magmatic events generally last for about 10Ma,while remelting granites generally last for 20Ma.It reflects two stages from the melting of the basement rock to the intrusion crystallization.It has a process of melting from the basement solid rock,which also requires approximately 10Ma.The melting of the solid rock is about 10Ma and the intrusion crystallization of the magma activity is about 10Ma.The Linglong period remelting granite is a post collision product of the Yangtze and North China plates.Guojialing period magmatic event represents the beginning of the Mesozoic tectonic system transformation in eastern China,Weideshan period magmatic event represents the peak period of tectonic system transformation,and Laoshan period magmatic event represents the end period of tectonic system transformation.86.8%of gold deposits are hosted in the granites of Linglong period,and 6.9%of gold deposits are hosted in the granites of Guojialing period.The background of Au element in the granites of Linglong period and Guojialing period is significantly higher than that in Weideshan period and Laoshan period.The range of ore sulfur is similar to granites in Linglong period and Guojialing period,especially with a large overlap with granites in Linglong period.It has the c

关 键 词：金矿 中生代花岗岩 成矿预测 找矿方向 胶东地区 

分 类 号：P618.51[天文地球—矿床学]