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黄金科学技术 ›› 2018, Vol. 26 ›› Issue (4): 396-405.doi: 10.11872/j.issn.1005-2518.2018.04.396

• •    下一篇

胶东西北部重要金成矿断裂带特征

肖风利1(),曾庆栋2,3,4(),马凤山2,3,4,王昭坤1,孙之夫5,孙宗峰5   

  1. 1 山东黄金集团有限公司,山东 济南 250101
    2 中国科学院地质与地球物理研究所,中国科学院矿产资源研究重点实验室,北京 100029
    3 中国科学院地球科学研究院,北京 100029
    4 中国科学院大学地球科学学院,北京 100049
    5 山东黄金地质勘查有限公司,山东 莱州 261400
  • 收稿日期:2018-04-17 修回日期:2018-05-25 出版日期:2018-10-10 发布日期:2018-10-17
  • 作者简介:肖风利(1968-),男,山东新泰人,高级工程师,从事金属成矿与找矿研究工作。xiaofl@sd-gold.com|曾庆栋(1964-),男,山东青州人,研究员,从事内生金属成矿作用与找矿预测研究工作。zengqingdong@mail.iggcas.ac.cn
  • 基金资助:
    国家重点研发计划项目“华北克拉通成矿系统的深部过程与成矿机理”(2016YFC0600100);山东黄金集团有限公司科研(深钻)项目“胶东金矿集区超深部综合地质研究与资源预测”

Features of Major Gold Metallogenic Fracture Belt in Northwestern Jiaodong

Fengli XIAO1(),Qingdong ZENG2,3,4(),Fengshan MA2,3,4,Zhaokun WANG1,Zhifu SUN5,Zongfeng SUN5   

  1. 1 Shandong Gold Group Co.,Ltd.,Jinan 250000,Shandong,China
    2 Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China
    3 Institutions of Earth Science,Chinese Academy of Sciences,Beijing 100029,China
    4 College of Earth Sciences,University of Chinese Academy of Sciences,Beijing 100049,China
    5 Shandong Gold Geology and Mineral Exploration Co.,Ltd.,Laizhou 261400,Shandong,China
  • Received:2018-04-17 Revised:2018-05-25 Online:2018-10-10 Published:2018-10-17

摘要:

胶东地区已累计探明金资源储量超过4 500t,成为世界级重要的金矿集区之一。该地区发育蚀变岩型、石英脉型和层间破碎带型金矿,受区域主干断裂、次级断裂及盆地边滑动断裂的控制,其中蚀变岩型金矿是区内最重要的金矿类型。胶东西北部已发现的超大型金矿均受胶西北三山岛、焦家和招平3条主干断裂的控制,3条主干断裂控制的金矿资源量已超过3 300t。这3条主干断裂阶段活动明显:早阶段发生韧性剪切变形作用,形成韧性剪切带,由糜棱岩和糜棱岩化岩石组成;中阶段发生脆性变形作用,形成碎裂岩(化)带;晚阶段为挤压变形,形成断层泥。金矿成矿与中期脆性变形密切相关,金矿化赋存于主干断裂带中碎裂(角砾)岩带发育部位。研究表明,3条主干断裂深部仍具有巨大的找矿潜力。

关键词: 胶东西北部, 蚀变岩型金矿, 超大型, 金矿集区, 三山岛断裂, 焦家断裂, 招平断裂, 构造叠加

Abstract:

Over 4 500 tons of gold reserves have been proved in Jiaodong area,and Jiaodong area has become one of the important world-class gold cluster areas. Altered rock type,quartz vein type and interlayer fracture zone type gold ores are the major gold ore type in Jiaodong area,these gold ores are controlled by major regional faults,secondary faults and interlayer slide faults. Altered rock type gold deposit is the most important gold deposit in Jiaodong area. The discovery super-large gold deposits are controlled by Sanshandao,Jiaojia and Zhaoping faults,over 3 300 tons gold reserves have been proved in these three major faults. Sanshandao,Jiaojia and Zhaoping faults are characterized by poly-stage activities:early stage ductile shear deformation characterized by mylonite and mylonitic rocks,middle stage brittle deformation characterized by the cataclastic rock (or breccia),and late stage compressional deformation characterized by the fault gouge. The gold mineralization in Jiaodong area is closely related to the middle stage brittle deformation,and the gold mineralization occur within the catclastic(breccia) zones.The research shows that the three major faults still have huge exploration ore potential.

Key words: northwestern Jiaodong, altered rock type gold ore, super-large scale, ore-concentrating area, Sanshandao fault, Jiaojia fault, Zhaoping fault, structural overprinting

图1

 胶东地质简图及金矿分布[16] 1.太古宇胶东群;2.古元古界荆山群;3.苏鲁高压—超高压变质岩块;4.白垩系火山岩;5.第四系沉积物;6.中生代花岗岩;7.主要断裂;8.石英脉型金矿;9.蚀变岩型金矿;10.城市"

图2

三山岛断裂地质地球化学剖面图(三山岛金矿,-435 m中段N462-1号穿脉)"

图3

 三山岛断裂宏观与微观变形特征 (a)花岗岩韧性变形—石英拉长(透镜状);(b)三山岛断裂中贯入含金石英脉;(c)碎裂岩化、角砾岩化蚀变岩;(d)主断裂中断层泥与挤压带;(e)韧性变形—石英变形带(左)及拉长;(f)石英拉长及细粒化(透射光);(g)脆性变形—碎裂岩化构造;(h)角砾状构造,黄铁矿脉充填(反射光) Qz-石英;Qv-石英脉;Py-黄铁矿;Kf-钾长石;Hem-褐铁矿"

图4

 焦家断裂地质地球化学剖面图(新城金矿-680 m中段185线穿脉)"

图5

焦家断裂变形特征 (a)石英变形带及细粒化;(b)石英拉长及细粒化(透射光)(新城金矿);(c)碎裂状构造(黄铁矿充填);(d)角砾状构造(反射光)(白色为黄铁矿,焦家金矿) Kf-钾长石;Qz-石英;Pl-斜长石;Ser-绢云母;Py-黄铁矿"

图6

招平断裂变形特征 (a)石英波状消光、重结晶;(b)石英透镜状(透射光);(c)碎裂结构,黄铁矿脉充填;(d)角砾状构造矿石(反射光)(东风金矿) Qz-石英;Py-黄铁矿"

图7

 招平断裂地质地球化学剖面图(东风金矿-420 m中段159线穿脉坑道)"

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