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黄金科学技术 ›› 2024, Vol. 32 ›› Issue (6): 949-964.doi: 10.11872/j.issn.1005-2518.2024.06.155

• 特约专栏 • 上一篇    下一篇

基于重磁联合反演及三维可视化技术的玲珑复式岩体深部形态研究及其地质意义

贺春艳1,2,3(), 王润生1,2,3, 魏印涛1,2,3, 宋明春3,4, 刘洪波1,2,3, 刘晨成1,2,3, 王冉1, 郭国强1,2,3, 李振涛1,3, 李娜1   

  1. 1.山东省物化探勘查院,山东 济南 250013
    2.地下资源环境高精度探测山东省工程研究中心,山东 济南 250013
    3.山东省地质勘查工程技术研究中心,山东 济南 250013
    4.河北地质大学,河北 石家庄 050031
  • 收稿日期:2024-05-30 修回日期:2024-07-19 出版日期:2024-12-31 发布日期:2024-12-20
  • 作者简介:贺春艳(1982-),女,陕西黄龙人,高级工程师,从事地质—地球物理勘查及找矿方法研究工作。94423937@qq.com
  • 基金资助:
    国家自然科学基金项目NSFC-山东联合基金项目“胶东深部金矿断裂控矿机理”(U2006201);2024年部省协议地质勘查项目“胶东金矿深部协同三维精细探测技术研究及找矿预测”(鲁勘字(2024)68号);山东省科学技术厅重大创新工程项目“深部探测综合地球物理技术”(2018CXGC1601);山东省地矿局科技创新及攻关项目“胶东深部金矿断裂综合地球物理特征研究”(KY202112);“胶西北矿集区招平断裂带深部电性结构研究”(KY202226)

Study of Deep Morphology of Linglong Complex Rock Mass and Its Geological Significance Based on Gravity-Magnetic Joint Inversion and 3D Visualization Technology

Chunyan HE1,2,3(), Runsheng WANG1,2,3, Yintao WEI1,2,3, Mingchun SONG3,4, Hongbo LIU1,2,3, Chencheng LIU1,2,3, Ran WANG1, Guoqiang GUO1,2,3, Zhentao LI1,3, Na LI1   

  1. 1.Shandong Institute of Geophysical and Geochemical Exploration,Jinan 250013,Shandong,China
    2.Shandong Engineering Research Center of Underground Resources and Environment High Precision Detection,Jinan 250013,Shandong,China
    3.Shandong Provincial Engineering Research Center for Geological Prospecting,Jinan 250013,Shandong,China
    4.Hebei GEO University,Shijiazhuang 050031,Hebei,China
  • Received:2024-05-30 Revised:2024-07-19 Online:2024-12-31 Published:2024-12-20

摘要:

玲珑复式岩体是胶东西北部著名的花岗大岩体,也是胶东金矿集区最为重要的赋矿岩石,以花岗岩为围岩或主要以花岗岩为围岩的金矿约占胶东金矿集区总金金属储量的90%以上。以胶东地区21世纪以来完成的1/5万高精度重磁数据为基础,在已知地质、钻探和大深度地球物理探测剖面等资料的约束下,采用人机交互的重磁联合反演方法,综合解释了胶东西北部47条剖面的二维地质特征,利用三维可视化平台构建了玲珑复式岩体三维模型,综合解释的玲珑复式岩体中心厚度约为15 km,呈不规则蘑菇云状,其核部可能有较大规模白垩纪A型花岗岩侵入。研究结果对于认识胶东金矿成矿后的变化保存情况和深部金资源预测评价具有重要的参考意义。

关键词: 胶东金矿, 玲珑复式岩体, 重磁联合反演, 三维可视化, 剥蚀深度

Abstract:

The Linglong complex rock mass,a prominent large granite body located in the northwest of Jiaodong,serves as the principal ore-hosting rock within the Jiaodong gold concentration area.Notably,gold deposits associated with granite as the primary wall rock constitute over 90% of the total metal reserves in this region.This complex primarily comprises the Late Jurassic Linglong intrusive rock,along with the Early Cretaceous Guojialing,Weideshan,Laoshan,and Yushan intrusive rocks,among others.The Linglong complex rock mass,a significant intrusive rock formation in eastern China,is crucial for understanding regional geological structures and informing mineral resource development.Utilizing high-precision gravity and magnetic data at a 1∶50 000 scale from the Jiaodong area,collected since the early 21st Century,and constrained by existing geological,drilling,and deep geophysical survey profiles,the 2D geological characteristics of 47 sections in the northwest of Jiaodong were comprehensively interpreted by using the gravity and magnetic inversion method with man-machine interaction.Based on this foundation,a three-dimensional model of the Linglong composite rock mass has been developed utilizing a 3D visualization platform.Comprehensive ana-lysis reveals that the Linglong composite rock mass exhibits an irregular mushroom cloud-like morphology,with a central thickness measuring approximately 15 kilometers.The predominant component of this complex is the Late Jurassic Linglong intrusive rocks,while the core may contain a substantial Cretaceous A-type granite intrusion.Although these formations appear sporadically on the Earth’s surface,they are interconnected at depth and exhibit a significant scale of occurrence.Drawing upon findings from prior studies concerning the erosion degree of intrusive rocks,as well as the age and rate of large-scale crustal uplift,it is inferred that the Linglong complex rock mass was situated at a depth of approximately 30 km to 35 km during the Late Jurassic period.This research holds significant reference value for comprehending the post-mineralization alteration and preservation of the Jiaodong gold deposit,as well as for predicting and assessing deep gold resources.

Key words: Jiaodong gold mine, Linglong complex rock mass, gravity-magnetic joint inversion, 3D visua-lization, erosion depth

中图分类号: 

  • P618.51

图1

胶东区域地质简图1.中生代沉积盖层;2.新元古代盖层;3.古元古代盖层;4.白垩纪伟德山—崂山型岩体;5.白垩纪郭家岭型岩体;6.侏罗纪玲珑型花岗岩;7.三叠纪侵入岩;8.荣成超高压地体;9.古元古代侵入岩;10.太古宙变质基底;11.潜火山岩;12.铲式断层;13.走滑断层;14.地球物理剖面;15.建模范围"

图2

胶东西北部地质简图F1-三山岛断裂;F2-龙口—莱州断裂;F3-招远—平度断裂;F4-玲珑断裂;F5-丰仪断裂;F6-平度断裂;1.第四系;2.白垩纪沉积盖层;3.青白口纪—震旦纪蓬莱群;4.古元古代粉子山群;5.古元古代荆山群;6.白垩纪崂山型花岗岩;7.白垩纪伟德山型花岗岩;8.白垩纪郭家岭型花岗岩;9.侏罗纪玲珑型花岗岩;10.古元古代双顶片麻岩套;11.古元古代莱州组合;12.新太古代栖霞序列;13.潜火山岩;14.地质界线;15.平行不整合界线;16.实测断层;17.推断断层;18.建模范围"

表1

胶东主要地质体密度及磁化率参数统计"

地质单元密度/(×103 kg·m-3磁化率/(×10-6 4πSI)
平均值变化范围平均值变化范围
第四系1.71.44~1.93微弱-
白垩纪青山群2.62.27~2.77464~7510.6~3 485
白垩纪沉积地层(除青山群)2.62.26~2.756.4~18.70~81.5
元古代变质地层2.71~2.792.21~3.384.0~960~859
太古代变质地层2.82~2.932.55~3.684.7~1 3980~35 960
中生代酸性侵入岩2.56~2.622.36~2.91146~1 7352.0~7 653
中生代中酸性—中性侵入岩2.60~2.652.50~2.74146~8360~2 124
早前寒武纪变质中酸性侵入岩2.7~2.82.06~3.29243~34817.3~621

图3

胶东西北部重磁异常分区图1.重点研究区范围;2.异常区边界"

图4

31线重磁联合反演解释综合剖面图σ△g -重力异常反演拟合均方差;σ△T -磁异常反演拟合均方差;1.白垩纪沉积盖层;2.古元古代荆山群;3.侏罗纪玲珑型花岗岩;4.白垩纪伟德山型和崂山型花岗岩;5.早前寒武纪变质杂岩;6.基性俘虏体;7.地质界线;8.磁性体界线;9.断层"

图5

Creatar-XModeling软件中数据输入及提取"

图6

胶东西北部三维地质模型示意图1.新生代地层;2.白垩纪—古近纪王氏群;3.白垩纪青山群;4.白垩纪莱阳群;5.新元古代蓬莱群;6.古元古代粉子山群;7.古元古代荆山群;8.白垩纪伟德山序列和崂山序列;9.白垩纪郭家岭序列;10.侏罗纪玲珑序列;11.新太古代栖霞序列和古元古代双顶序列;12.新太古代马连庄序列;13.古元古代莱州序列"

图7

胶东西北部玲珑复式岩体三维空间特征1.玲珑型花岗岩;2.郭家岭型花岗岩;3.文登型花岗岩;4.伟德山型及崂山型花岗岩"

图8

胶东西北部中生代主要侵入岩三维结构图"

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