Basement structure characteristics of the Lingwu depression in southern Yinchuan Basin
-
摘要: 灵武凹陷位于银川断陷盆地东南部,受喜马拉雅期两次构造应力作用,即鄂尔多斯地块EW向的拉张应力及青藏高原NE向的挤压应力,造就了该区现今复杂的地质构造格局,为构造转折、交汇部位。自1970年以来监测到银川盆地及其周缘大于2.0级以上地震约3 000余次,且大多数小震及中强地震集中于灵武凹陷范围内,存在较严重的地震灾害隐患。以往研究表明,断裂构造为地震发生的根本原因,地层是决定地震活动次生灾害的主要因素。为解译灵武凹陷基底地质构造,笔者以1：5万区域重力资料为基础,以钻孔、地震剖面、大地电磁测深、可控源音频大地电磁测深剖面资料为约束,利用2.5D人机交互反演技术对灵武凹陷基底特征进行了精细刻画,为地震灾害防治工作提供依据。
-
关键词:
- 灵武凹陷 /
- 1：5万重力 /
- 2.5D人机交互反演 /
- 基底构造
Abstract: The Lingwu depression,located in the southeastern part of the Yinchuan Faulted Basin,has a complex geological tectonic framework and serves as the turning and intersection part of structures due to the two Himalayan tectonic stresses,namely the EW-direction tensile stress of the Ordos block and the NE-direction compressive stress of the Qinghai-Tibet Plateau. Since 1970, more than 3000 earthquakes with magnitudes of greater than 2.0 have been monitored in the Yinchuan Basin and its periphery. Among them, most of the small and moderately strong earthquakes occurred in the Lingwu depression, which, therefore, has serious hidden risks of earthquake disasters. Previous studies indicate that fault structures are the cause for the earthquakes and that strata serve as the main reason for the earthquake secondary disasters in this depression. To interpret the geological structures in the basement of the Lingwu depression, this study finely characterized the basement characteristics of the Lingwu depression using the 2.5D human-computer interactive inversion technology based on the 1：50,000 regional gravity data and the constraints of data on drill holes, seismic profiles, magnetotelluric sounding, and controlled source audio-frequency magnetotellurics (CSAMT) profiles, thus providing a basis for the prevention and control of earthquake disasters. -
-
[1] 苏世民. 鄂尔多斯盆地西缘的两个不同类型的盆地[J]. 西安石油学院学报, 1996, 11(4):21-24.
[2] Su S M. Two different types of basin in the west margin of Ordos basin[J]. Journal of Xi'an Petroleum Institute, 1996, 11(4):21-24.
[3] 雷启云. 青藏高原东北缘弧形构造带的扩展与华北西缘银川盆地的演化[D]. 北京: 中国地震局地质研究所, 2016.
[4] Lei Q Y. The extension of the arc tectonic belt in the northeastern margin of the Tibet Plateau and the evolution of the Yinchuan basin in the western margin of the north China[D]. Beijing: China Academic Journal Electronic Publishing House, 2016.
[5] 李清河. 鄂尔多斯西缘与西南缘深部结构与构造[M]. 北京: 地震出版社, 1999.
[6] Li Q H. Deep structure in the western and southwestern margins of Ordos[M]. Beijing: Seismological Publishing House, 1999.
[7] 邓起东, 程绍平, 闵伟, 等. 鄂尔多斯块体新生代构造活动和动力学的讨论[J]. 地质力学学报, 1999, 5(3):13-22.
[8] Deng Q D, Cheng S P, Min W, et al. Discussion on Cenozoic tectonics and dynamics Ordos block[J]. Journal of Geomechanics, 1999, 5(3):13-22.
[9] 侯旭波, 崔红庄, 郇玉龙. 银川盆地不同构造层构造样式及形成演化分析[J]. 东北石油大学学报, 2012, 36(6):28-33.
[10] Hou X B, Cui H Z, Huan Y L. Analysis of structural style and tectonic evolution in Yinchuan basin[J]. Journal of Northeast Petroleum University, 2012, 36(6):28-33.
[11] 陈晓晶, 虎新军, 李宁生, 等. 银川平原基于地球物理资料三维建模的深部地质构造研究[J]. 物探与化探, 2020, 44(2):245-253.
[12] Chen X J, Hu X J, Li N S, et al. Research on the deep geological structure in Yinchuan plain:3D modeling based on geophysical data[J]. Geophysical and Geochemical Exploration, 2020, 44(2):245-253.
[13] 李宁生, 冯志民, 朱秦, 等. 宁夏区域重磁资料开发利用研究[M]. 北京: 地质出版社, 2016.
[14] Li N S, Feng Z M, Zhu Q, et al. Development and utilization of gravity and magnetic data in Ningxia area[M]. Beijing: Geological Publishing House, 2016.
[15] 李宁生, 虎新军, 杜鹏, 等. 银川平原深部构造特征及断裂活动性研究[M]. 北京: 地质出版社, 2020.
[16] Li N S, Hu X J, Du P, et al. Research on deep structural characteristics and fault activity in Yinchuan plain[M]. Beijing: Geological Publishing House, 2020.
[17] 徐占海, 李捍国, 宋新华, 等. 中国区域地质志·宁夏志[M]. 北京: 地质出版社, 2017.
[18] Xu Z H, Li H G, Song X H, et al. Regional geology of China,Ningxia[M]. Beijing: Geological Publishing House, 2017.
[19] 方盛明, 赵成彬, 柴炽章, 等. 银川断陷盆地地壳结构与构造的地震学证据[J]. 地球物理学报, 2009, 52(7):1768-1775.
[20] Fang S M, Zhao C B, Chai Z Z, et al. Seismological evidence of crustal structure and tectonics in Yinchuan rift basin[J]. Journal of Geophysics, 2009, 52(7):1768-1775.
[21] 酆少英, 高锐, 龙长兴, 等. 银川地堑地壳挤压应力场:深地震反射剖面[J]. 地球物理学报, 2011, 54(3):692-697.
[22] Feng S Y, Gao R, Long C X, et al. Crustal compression stress field in Yinchuan graben:deep seismic reflection profile[J]. Journal of Geophysics, 2011, 54(3):692-697.
[23] 侯旭波, 尹克敏, 林中凯, 等. 银川盆地构造反转及其演化与叠合关系分析[J]. 高校地质学报, 2014, 20(2):277-285.
[24] Hou X B, Yin K M, Lin Z K, et al. Analysis of tectonic inversion and its evolution and superposition relationship in Yinchuan basin[J]. Geological Journal of Universities, 2014, 20(2):277-285.
[25] 黄兴富, 施炜, 李恒强, 等. 银川盆地新生代构造演化:来自银川盆地主边界断裂运动学的约束[J]. 地学前缘, 2013, 20(4):199-210.
[26] Huang X F, Shi W, Li H Q, et al. Cenozoic tectonic evolution of the Yinchuan basin:Constraints from the deformation of its boundary faults[J]. Earth Science Frontiers, 2013, 20(4):199-210.
[27] 李燕, 刘保金, 酆少英, 等. 利用地震折射和反射波资料研究银川盆地浅部结构和隐伏断裂[J]. 地球物理学报, 2017, 60(8):3096-3109.
[28] Li Y, Liu B J, Feng S Y, et al. Exploration of shallow structure and buried faults in the Yinchuan basin using seismic refraction and reflection data[J]. Chinese Journal of Geophysics, 2017, 60(8):3096-3109.
[29] 虎新军, 李宁生, 周永康, 等. 银川平原断裂体系划分与研究[J]. 矿产与地质, 2018, 32(6):1075-1083.
[30] Hu X J, Li N S, Zhou Y K, et al. Division and study of fracture system in Yinchuan Plain[J]. Mineral Resources and Geology, 2018, 32(6):1075-1083.
[31] 汪琪, 赵志鹏, 尹秉喜, 等. 电磁测深MT法在平原深部地热调查中的应用[J]. 工程地球物理学报, 2016, 13(6):782-786.
[32] Wang Q, Zhao Z P, Yin B X, et al. The application of magneto telluric Sounding (MT) method to deep geothermal investigation in Plain[J]. Chinese Journal of Engineering Geophysics, 2016, 13(6):782-786.
[33] 尹秉喜, 闵刚. 宁夏中上地壳电性结构特征研究[M]. 银川: 宁夏人民出版社, 2014.
[34] Yin B X, Min G. Research on the electrical structure characteristics of the middle and upper crust in Ningxia[M]. Yinchuan: Ningxia People’s Publishing House, 2014.
-
计量
- 文章访问数: 480
- PDF下载数: 83
- 施引文献: 0
下载: