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现代地质 ›› 2021, Vol. 35 ›› Issue (05): 1274-1281.DOI: 10.19657/j.geoscience.1000-8527.2021.108

• 构造地质学 • 上一篇    下一篇

胶西北断裂构造蚀变分带及其铲式分布特征

吕承训1,2, 霍庆龙3, 唐占信4, 范潇5, 汤磊4, 许亚青6, 袁月蕾7   

  1. 1.中国地质调查局发展研究中心,北京 100037
    2.中国地质大学(北京),北京 100083
    3.河北省众联能源环保科技有限公司,河北 石家庄 050011
    4.山东招金集团有限公司,山东 招远 265400
    5.云冈石窟研究院,山西 大同 037007
    6.贵州省煤矿地质工程咨询与地质环境监测中心,贵州 贵阳 550001
    7.中国科学院地理科学与资源研究所,北京 100101
  • 收稿日期:2021-05-05 修回日期:2021-07-15 出版日期:2021-10-10 发布日期:2021-11-04
  • 作者简介:吕承训,男,博士后,1987年出生,地质工程专业,主要从事应用构造地质学和地质灾害相关领域研究。
  • 基金资助:
    国家自然科学基金项目(40972061);山东省国土资源厅项目(鲁地调合[2012]33 号)

Structural Alteration Zone and Listric Distribution Characteristics in Northwest Jiaodong Peninsula

LÜ Chengxun1,2, HUO Qinglong3, TANG Zhanxin4, FAN Xiao5, TANG Lei4, XU Yaqing6, YUAN Yuelei7   

  1. 1. Development Research Center of China Geological Survey, Beijing 100037, China
    2. China University of Geosciences (Beijing), Beijing 100083, China
    3. Hebei Zhonglian Energy and Environmental Protection Technology Co.Ltd, Shijiazhuang, Heibei 050011, China
    4. Shandong Zhaojin Group Co.Ltd, Zhaoyuan, Shandong 265400, China
    5. Yungang Grottoes Research Institute, Datong, Shanxi 037007, China
    6. Guizhou Coal Mine Geological Engineering Consultation and Geological Environment Monitoring Center, Guiyang, Guizhou 550001, China
    7. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
  • Received:2021-05-05 Revised:2021-07-15 Online:2021-10-10 Published:2021-11-04

摘要:

胶东是全球最大的与中生代花岗岩有关的热液交代蚀变金矿集中区,其成矿与断裂及蚀变作用有关。以焦家断裂和招平断裂为典型,开展构造变形蚀变岩剖面实测和地质填图,研究控矿断裂铲式分布的地质特征。研究发现:(1)断裂蚀变带的宽度不是以往认为的几十米,而是达到几百米,或超过千米,蚀变的规模和强度控制了成矿作用;(2)断裂产状上陡下缓,浅部-200 m以上倾角在70°左右,深部-400 m以下倾角20°到30°,形成铲式断裂;(3) 铲式断裂显示上盘下滑的运动特征,应力应变特征表明成矿作用发生于应力松弛阶段;(4)断裂的倾向控制矿化带的侧伏方向,焦家断裂带倾向北西而其中矿体向南西侧伏;招平断裂倾向南东则矿体为北东向侧伏。

关键词: 胶东金矿, 构造变形岩相, 蚀变带, 铲式断裂控矿

Abstract:

Jiaodong is the world’s largest Mesozoic granite-related hydrothermal/metasomatic gold province, and the gold mineralization is related to faulting and alteration. In this paper, the Jiaojia and Zhaoping faults are taken as typical examples to study the geological characteristics of the listric ore-controlling fault distributions, through measuring the deformation and alteration profile and geological mapping. The results revealed that: (1) the fault alteration zone is hundreds of meters to over kilometers wide, instead of meters as previously suggested. The scale and intensity of alteration control the gold mineralization. (2) Orientation for the upper and lower part of the fault is steep and gentle, respectively. Dip angle for the shallow (above -200 m) and deeper (below -400 m) parts of the fault is around 70° and 20°-30°, respectively. The fault morphology is listric. (3) The listric fault indicates motion characteristic of sliding hanging wall, and the stress-strain features show that the mineralization occurred in the regional stress relaxation stage. (4) Dip direction of the fault controls the lateral trend of the mineralized zone. The Jiaojia fault dips to the NW, and the associated mineralization zone trends SW; the Zhaoping fault dips to the SE, and the associated mineralization zone trends NE.

Key words: Jiaodong gold deposit, deformed lithofacies, alteration zone, listric fault-controlled mineralization

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