吕古贤, 焦建刚, 张宝林, 吕承训, 王宗秀, 王红才, 王翠芝. 陆内岩浆核杂岩隆起-拆离构造——胶东地区研究实例[J]. 地质通报, 2023, 42(4): 489-509. DOI: 10.12097/j.issn.1671-2552.2023.04.001
    引用本文: 吕古贤, 焦建刚, 张宝林, 吕承训, 王宗秀, 王红才, 王翠芝. 陆内岩浆核杂岩隆起-拆离构造——胶东地区研究实例[J]. 地质通报, 2023, 42(4): 489-509. DOI: 10.12097/j.issn.1671-2552.2023.04.001
    LYU Guxian, JIAO Jiangang, ZHANG Baolin, LYU Chengxun, WANG Zongxiu, WANG Hongcai, WANG Cuizhi. Uplift-detachment structure of intracontinental magmatic core complex: A case study of Jiaodong area[J]. Geological Bulletin of China, 2023, 42(4): 489-509. DOI: 10.12097/j.issn.1671-2552.2023.04.001
    Citation: LYU Guxian, JIAO Jiangang, ZHANG Baolin, LYU Chengxun, WANG Zongxiu, WANG Hongcai, WANG Cuizhi. Uplift-detachment structure of intracontinental magmatic core complex: A case study of Jiaodong area[J]. Geological Bulletin of China, 2023, 42(4): 489-509. DOI: 10.12097/j.issn.1671-2552.2023.04.001

    陆内岩浆核杂岩隆起-拆离构造——胶东地区研究实例

    Uplift-detachment structure of intracontinental magmatic core complex: A case study of Jiaodong area

    • 摘要: 在胶东地区金矿矿田构造研究的基础上, 把岩浆核杂岩和拆离构造联系起来, 提出陆内岩浆核杂岩隆起-拆离构造的新模式, 并认为中生代该区不发育变质核杂岩构造。经过10多年的构造变形蚀变岩相填图、岩浆岩结构构造填图和古地磁研究、运动学测量, 结合地球物理资料分析发现, 胶东地区典型的玲珑岩浆核杂岩隆起-拆离构造显示出长垣状、拱曲形态的穹窿, 表现为: ①穹窿核部由多期和多构造性质的花岗质杂岩组成; ②花岗杂岩体被断层圈闭, 这些中低角度铲状形态的拆离带剪切断裂, 其宽大的破碎岩带显示了韧-脆性变形叠加, 发生岩浆期后热液交代蚀变矿化作用; ③拆离断层上盘岩石围绕岩浆核分布, 由基底变质岩和中生代沉积岩组成, 呈滑脱凹陷状态。岩浆核杂岩隆起-拆离构造是符合东亚陆内构造岩浆活化背景的一个新模式。通过岩浆核杂岩隆起-拆离构造研究, 提出岩浆隆起和拉分盆地属于同一构造系统, 挤压构造岩浆隆起和引张拆离凹陷带是应力场转化过程的产物, 而拆离铲式断裂和脆-韧性叠加的构造岩带是成矿预测的目标, 并把区域成岩成矿规律作为直接观测和勘查的标志, 在区域地质成矿规律研究、地质调查、成矿预测等方面具有广泛推广价值和示范引导意义。

       

      Abstract: Based on the study of gold field structure in Jiaodong area, a new model is put forward which developed as "magma core complex uplift - detachment zone structure" links detachment zone structure and magmatic core complex, and metamorphic core complex structure was not developed in the Mesozoic area.In this study, after more than 10 years of tectonic deformation and alteration lithofacies mapping, magmatic structure mapping, paleomagnetic research and kinematic survey, combined with geophysical data analysis, it is found that the typical "Linglong magmatic core complex uplift and detachment zone structure" in Jiaodong area shows a long-round arch dome.The geological phenomena show: ①The dome core is composed of multi-stage and multi-structural granitic complexes; ②The granitic complex is trapped by faults, and these detachment zones and shovel type fractures with low and middle-angles are shear fractured.The broad fracture zones show superposition of ductile and brittle deformation and post-magmatic hydrothermal metasomatic alteration mineralization; ③The hanging wall rocks of the detachment fault are distributed around the magmatic core, and are composed of basement metamorphic rocks and Mesozoic sedimentary rocks, showing a state of detachment depression.The "magmatic core complex uplift-detachment zone structure" is a new model conforming to the East Asian intracontinental tectono-magmatic activation background.Through the study of magma core complex uplift - detachment zone structure, it is proposed that magmatic uplift and pull-apart basin belong to the same tectonic system, extruding tectonic-magmatic uplift and extensional detachment depressions are the products of stress field transformation process, and disintegrating shovel fault and brittle ductile superposition tectonic-rock belt are the targets of metallogenic prediction.Regional diagenetic and metallogenic laws are taken as the mark of direct observation and exploration, and regional geological and metallogenic laws are studied.Geological survey and metallogenic prediction have extensive popularization value and demonstration significance.

       

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