新疆准噶尔北缘覆盖区深部地质结构及其地质意义——来自综合地球物理探测的证据

刘尧, 孟贵祥, 吕庆田, 张贵宾, 邓震, 祁光, 薛融晖. 2021. 新疆准噶尔北缘覆盖区深部地质结构及其地质意义——来自综合地球物理探测的证据. 地球物理学报, 64(11): 4075-4089, doi: 10.6038/cjg2021P0027
引用本文: 刘尧, 孟贵祥, 吕庆田, 张贵宾, 邓震, 祁光, 薛融晖. 2021. 新疆准噶尔北缘覆盖区深部地质结构及其地质意义——来自综合地球物理探测的证据. 地球物理学报, 64(11): 4075-4089, doi: 10.6038/cjg2021P0027
LIU Yao, MENG GuiXiang, Lü QingTian, ZHANG GuiBin, DENG Zhen, QI Guang, XUE RongHui. 2021. Deep structure beneath the overburdened area of the northern margin of Junggar Basin and its geologic implications: Evidence from 3D inversion of integrated geophysical data. Chinese Journal of Geophysics (in Chinese), 64(11): 4075-4089, doi: 10.6038/cjg2021P0027
Citation: LIU Yao, MENG GuiXiang, Lü QingTian, ZHANG GuiBin, DENG Zhen, QI Guang, XUE RongHui. 2021. Deep structure beneath the overburdened area of the northern margin of Junggar Basin and its geologic implications: Evidence from 3D inversion of integrated geophysical data. Chinese Journal of Geophysics (in Chinese), 64(11): 4075-4089, doi: 10.6038/cjg2021P0027

新疆准噶尔北缘覆盖区深部地质结构及其地质意义——来自综合地球物理探测的证据

  • 基金项目:

    国家重点研发计划课题(2018YFC0604002)和中国地质调查局地质大调查项目(DD20190071)联合资助

详细信息
    作者简介:

    刘尧, 男, 1989年生, 中国地质大学(北京)博士研究生, 主要从事重磁反演理论及深部探测等方面的研究.E-mail: liuyao2008666@126.com

    通讯作者: 孟贵祥, 男, 1968年生, 研究员, 主要从事深部探测和金属矿勘查技术方法研究.E-mail: mgxlw@126.com
  • 中图分类号: P541;P631

Deep structure beneath the overburdened area of the northern margin of Junggar Basin and its geologic implications: Evidence from 3D inversion of integrated geophysical data

More Information
  • 本文利用准噶尔北缘覆盖区的高精度地面重磁数据开展三维约束反演,揭示出准噶尔盆地北缘浅覆盖区内三维密度结构具有横向非均匀性,纵向有向深部延伸的趋势;深部广泛分布石炭纪、泥盆纪火山岩地层等高磁性体,零散分布热液蚀变导致的热退磁的火山岩;北西向分布的低密度低磁性物质,对应无磁性的断裂破碎带.结合多尺度边缘检测方法推断得到研究区隐伏断裂体系以及火山岩地层的空间展布.对贯穿研究区的综合地球物理探测剖面进行人机交互联合反演,结果显示控制扎河坝蛇绿岩带分布的南北界深大断裂在深部构成开口向下的对称扇形构造样式,说明此蛇绿岩带所代表的古洋盆具有双向俯冲的特征;结合区域地质资料,以及岩石地球化学研究成果,认为剖面穿过的3个酸性岩体均为形成于晚石炭世后造山拉张构造环境的A型花岗岩,可能是准噶尔东北缘造山作用结束的标志.最后结合大量地质、地球化学和地球物理资料,对准噶尔东北缘区域构造演化进行了讨论,认为扎河坝-阿尔曼太古洋盆于中奥陶世开始汇聚,古洋盆向南北两侧双向俯冲,在晚志留纪-早泥盆纪洋盆闭合.

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  • 图 1 

    区域地质构造图(a)及综合地球物理剖面位置(b)

    Figure 1. 

    The tectonic setting (a) and geophysical profile (b)

    图 2 

    区域重磁异常(图中黑色框为研究区范围)

    Figure 2. 

    Regional gravity and magnetic anomalies (study area in the black frame)

    图 3 

    研究区重磁异常

    Figure 3. 

    Gravity and magnetic anomalies in the study area

    图 4 

    研究区剩余重磁异常

    Figure 4. 

    Residual gravity and magnetic anomalies in the study area

    图 5 

    密度结构图

    Figure 5. 

    3D view of density structure

    图 6 

    磁化率结构图

    Figure 6. 

    3D view of susceptibility structure

    图 7 

    多尺度边缘检测结果

    Figure 7. 

    The result of multiscale edge detection

    图 8 

    隐伏断裂体系分布

    Figure 8. 

    Distribution of faults

    图 9 

    AB剖面反演及推断解释结果

    Figure 9. 

    Results of AB profile inversion and inferential interpretation

    图 10 

    东准噶尔地区洋板块演化模式图(据赵同阳等,2017修改)

    Figure 10. 

    Evolution model of oceanic plate in East Junggar area

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收稿日期:  2021-01-11
修回日期:  2021-04-19
上线日期:  2021-11-10

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