深地震测深揭示的济阳坳陷地壳结构特征
|
摘要
对穿过济阳坳陷的3条深地震测深剖面进行解释、对比分析显示,济阳坳陷地壳结构分为上、中、下3层,莫霍面深度在31km左右,区域起伏变化不大,深浅部构造呈镜像对称关系。济阳坳陷内中地壳存在低速体发育,为其顶面滑脱层的发育以及滑脱构造的形成提供了必要条件,也导致上下地壳厚度的横向变化存在差异。惠民凹陷下方P_m震相之前出现P_4震相表明,其莫霍面以壳幔过渡带形式存在;东营凹陷下方P_m震相尖锐,其莫霍面则表现为一级间断面性质,体现了不同凹陷深部壳幔作用的差异。结论表明,济阳坳陷地壳结构具有典型的华北地区地壳结构特征,上下地壳厚度横向变化差异与滑脱构造密切相关,而莫霍面性质差异与深部软流圈上涌以及下地壳小规模拆沉有关。
Through processing and contrast analysis of 3deep seismic sounding lines crossing Jiyang depression,we find that the crustal structure of Jiyang depression can be divided into three layers:upper,mid and lower crust.The Moho depth of Jiyang depression is about 31 km,and the interface variation is gentle.The deep tectonic is mirror symmetrical to the shallow tectonic.Low velocity bodies exist in the mid-crust of Jiyang depression,providing necessary conditions for the detachment development,and causing variations of crustallateral thickness between the upper crust and lower crust.The Moho interface feature differs between the Huimin sag and Dongying sag.In Huimin sag there is a P_4 seismic phase before the P_mphase,which is the reflection of the crust-mantle transition zone.However,in Dongying sag the P_mseismic phase reflects the features of first order discontinuous interface.The result shows that the crustal structure of Jiyang depression has typical features of north China and that asthenospheric upwelling changes the Moho interface property of Jiyang depression.
Through processing and contrast analysis of 3deep seismic sounding lines crossing Jiyang depression,we find that the crustal structure of Jiyang depression can be divided into three layers:upper,mid and lower crust.The Moho depth of Jiyang depression is about 31 km,and the interface variation is gentle.The deep tectonic is mirror symmetrical to the shallow tectonic.Low velocity bodies exist in the mid-crust of Jiyang depression,providing necessary conditions for the detachment development,and causing variations of crustallateral thickness between the upper crust and lower crust.The Moho interface feature differs between the Huimin sag and Dongying sag.In Huimin sag there is a P_4 seismic phase before the P_mphase,which is the reflection of the crust-mantle transition zone.However,in Dongying sag the P_mseismic phase reflects the features of first order discontinuous interface.The result shows that the crustal structure of Jiyang depression has typical features of north China and that asthenospheric upwelling changes the Moho interface property of Jiyang depression.
引文
[1]吴智平,李伟,任拥军,等.济阳坳陷中生代盆地演化及其与新生代盆地叠合关系探讨[J].地质学报,2003,77(2):280-286(Wu Zhiping,Li Wei,Ren Yongjun,et al.Basin Evolution in the Mesozoic and Superposition of Cenozoic Basin in the Area of the Jiyang Depression[J].Acta Geologica Sinica,2003,36(2):81-87)
[2]张先康,刘国栋,刘泰升,等.华北地壳结构的三维探测和研究[A]∥寸单集--庆贺刘光鼎院士工作50周年学术论文集[C].北京:科学出版社,1998(Zhang Xiankang,Liu Guodong,Liu Taisheng,et al.Spatial Deep Seismic Sounding Experiment of Crustal Structure in North China[A]∥Cun dan Set-To Celebrate the 50Anniversary of the Work of Liu Guangding Academician Academic Papers[C].Beijing:Science Press,1998)
[3]王帅军,王夫运,张建狮,等.渤海湾西南缘及其邻近地区地壳结构特征[J].地震地质,2013,25(2):278-288(Wang Shuaijun,Wang Fuyun,Zhang Jianshi,et al.Crustal Structure and Its Features in the Southwest Margin of Bohai Bay and Adjacent Areas[J].Seismology and Geology,2013,25(2):278-288)
[4]田继军,姜在兴.惠民凹陷与东营凹陷沙四段上亚段滩坝沉积特征对比与分析[J].吉林大学学报:地球科学版,2012,42(3):612-623(Tian Jijun,Jiang Zaixing.Comparison and Analysis of Beach Bars Sedimentary Characteristics of Upper Es4in Huimin and Dongying Depressionp[J].Journal of Jinlin University:Earth Science Edition,2012,42(3):612-623)
[5]邱隆伟,王兴谋.济阳坳陷断裂活动和CO2气藏的关系研究[J].地质科学,2006,41(3):430-440(Qiu Longwei,Wang Xingmou.A Study on Relationship between Fault Activity and CO2Pools in the Jiyang Depression[J].Chinese Journal of Geology,2006,41(3):430-440)
[6]王世虎,夏斌,陈根文,等.济阳坳陷构造特征暨形成机制讨论[J].大地构造与成矿学,2004,28(4):428-434(Wang Shihu,Xia Bin,Chen Genwen,et al.Characteristics of Jiyang Depression and Mechanism of Basin Formation[J].Geotectonica et Metallogenia,2004,28(4):428-434)
[7]王椿镛,王贵美,林中洋,等.用深地震反射方法研究邢台地震区地壳细结构[J].地球物理学报,1993,36(4):445-452(Wang Chunyong,Wang Guimei,Lin Zhongyang,et al.A Study on Fine Crustal Structure in Xingtai Earthquake Area Based on Deep Seismic Reflection Profiling[J].Chinese Journal of Geophysics,1993,36(4):445-452)
[8]李理,钟大赉,时秀朋.鲁西隆起和济阳坳陷新生代隆坳耦合关系[J].地质学报,2007,81(9):1 215-1 225(Li Li,Zhong Dalai,Shi Xiupeng.Cenozoic Uplifting/Subsidence Coupling between the West Shandong Rise and the Jiyang Depression,Northern China[J].Acta Geologica Sinica,2007,81(11):1 215-1 225)
[9]李理,钟大赉,杨长春,等.渤海湾盆地济阳坳陷滑脱构造研究[J].地球物理学报,2008,51(2):521-530(Li Li,Zhong Dalai,Yang Changchun,et al.The Decollement Structures in Jiyang Depression,Bohai Bay Basin[J].Chinese Journal of Geophysics,2008,51(2):521-530)
[10]牛树根,孙爱群,白文吉.造山带与相邻盆地间物质的横向迁移[J].地学前缘,1995(1):85-92(Niu Shugen,Sun Aiqun,Bai Wenji.Lateral Migration of the Lithospheric Material between Orogenic Zones and Adjacent Basins[J].Earth Science Frontiers,1995(1):85-92)
[11]刘和甫,梁慧社.中国东部中新生代裂陷盆地与伸展山岭耦合机制[J].地学前缘,2000,7(4):477-485(Liu Hefu,Liang Huishe.The Coupling Mechanisms of Mesozoic-Cenozoic Rift Basins and Extensional Mountain System in Eastern China[J].Earth Science Frontiers,2000,7(4):477-485)
[12]马杏垣,刘昌铨,刘国栋.江苏响水至内蒙古满都拉地学断面[J].地质学报,1991(3):199-214(Ma Xingyuan,Liu Changquan,Liu Guodong.Xiangshui(Jiangsu Province)to Mandal(Nei Mengol)Geoscience Transect[J].Acta Geologica Sinica,1991(3):199-214)
[13]路凤香,郑建平,侯青叶,等.中国东部壳-幔、岩石圈-软流圈之间的相互作用带:特征及转化时限[J].中国地质,2006,33(4):774-775(Lu Fengxiang,Zheng Jianping,Hou Qingye,et al.Zones of Crust-Mantle and Lithosphere-Asthenosphere Interaction in Eastern China:Characteristics and Timing of Transformation[J].Geology in China,2006,33(4):774-775)
[14]谭丽娟,蒋有录.渤海湾盆地东营-惠民凹陷油气成藏模式和油气富集控制因素[J].石油实验地质,2003,25(4):366-374(Tan Lijuan,Jiang Youlu.Pool-Forming Patterns of Hydrocarbon and Controlling Factors of Hydrocarbon Enrichment in the Dongying and the Huimin Sags[J].Petroleum Geology and Experiment,2003,25(4):366-374)
[2]张先康,刘国栋,刘泰升,等.华北地壳结构的三维探测和研究[A]∥寸单集--庆贺刘光鼎院士工作50周年学术论文集[C].北京:科学出版社,1998(Zhang Xiankang,Liu Guodong,Liu Taisheng,et al.Spatial Deep Seismic Sounding Experiment of Crustal Structure in North China[A]∥Cun dan Set-To Celebrate the 50Anniversary of the Work of Liu Guangding Academician Academic Papers[C].Beijing:Science Press,1998)
[3]王帅军,王夫运,张建狮,等.渤海湾西南缘及其邻近地区地壳结构特征[J].地震地质,2013,25(2):278-288(Wang Shuaijun,Wang Fuyun,Zhang Jianshi,et al.Crustal Structure and Its Features in the Southwest Margin of Bohai Bay and Adjacent Areas[J].Seismology and Geology,2013,25(2):278-288)
[4]田继军,姜在兴.惠民凹陷与东营凹陷沙四段上亚段滩坝沉积特征对比与分析[J].吉林大学学报:地球科学版,2012,42(3):612-623(Tian Jijun,Jiang Zaixing.Comparison and Analysis of Beach Bars Sedimentary Characteristics of Upper Es4in Huimin and Dongying Depressionp[J].Journal of Jinlin University:Earth Science Edition,2012,42(3):612-623)
[5]邱隆伟,王兴谋.济阳坳陷断裂活动和CO2气藏的关系研究[J].地质科学,2006,41(3):430-440(Qiu Longwei,Wang Xingmou.A Study on Relationship between Fault Activity and CO2Pools in the Jiyang Depression[J].Chinese Journal of Geology,2006,41(3):430-440)
[6]王世虎,夏斌,陈根文,等.济阳坳陷构造特征暨形成机制讨论[J].大地构造与成矿学,2004,28(4):428-434(Wang Shihu,Xia Bin,Chen Genwen,et al.Characteristics of Jiyang Depression and Mechanism of Basin Formation[J].Geotectonica et Metallogenia,2004,28(4):428-434)
[7]王椿镛,王贵美,林中洋,等.用深地震反射方法研究邢台地震区地壳细结构[J].地球物理学报,1993,36(4):445-452(Wang Chunyong,Wang Guimei,Lin Zhongyang,et al.A Study on Fine Crustal Structure in Xingtai Earthquake Area Based on Deep Seismic Reflection Profiling[J].Chinese Journal of Geophysics,1993,36(4):445-452)
[8]李理,钟大赉,时秀朋.鲁西隆起和济阳坳陷新生代隆坳耦合关系[J].地质学报,2007,81(9):1 215-1 225(Li Li,Zhong Dalai,Shi Xiupeng.Cenozoic Uplifting/Subsidence Coupling between the West Shandong Rise and the Jiyang Depression,Northern China[J].Acta Geologica Sinica,2007,81(11):1 215-1 225)
[9]李理,钟大赉,杨长春,等.渤海湾盆地济阳坳陷滑脱构造研究[J].地球物理学报,2008,51(2):521-530(Li Li,Zhong Dalai,Yang Changchun,et al.The Decollement Structures in Jiyang Depression,Bohai Bay Basin[J].Chinese Journal of Geophysics,2008,51(2):521-530)
[10]牛树根,孙爱群,白文吉.造山带与相邻盆地间物质的横向迁移[J].地学前缘,1995(1):85-92(Niu Shugen,Sun Aiqun,Bai Wenji.Lateral Migration of the Lithospheric Material between Orogenic Zones and Adjacent Basins[J].Earth Science Frontiers,1995(1):85-92)
[11]刘和甫,梁慧社.中国东部中新生代裂陷盆地与伸展山岭耦合机制[J].地学前缘,2000,7(4):477-485(Liu Hefu,Liang Huishe.The Coupling Mechanisms of Mesozoic-Cenozoic Rift Basins and Extensional Mountain System in Eastern China[J].Earth Science Frontiers,2000,7(4):477-485)
[12]马杏垣,刘昌铨,刘国栋.江苏响水至内蒙古满都拉地学断面[J].地质学报,1991(3):199-214(Ma Xingyuan,Liu Changquan,Liu Guodong.Xiangshui(Jiangsu Province)to Mandal(Nei Mengol)Geoscience Transect[J].Acta Geologica Sinica,1991(3):199-214)
[13]路凤香,郑建平,侯青叶,等.中国东部壳-幔、岩石圈-软流圈之间的相互作用带:特征及转化时限[J].中国地质,2006,33(4):774-775(Lu Fengxiang,Zheng Jianping,Hou Qingye,et al.Zones of Crust-Mantle and Lithosphere-Asthenosphere Interaction in Eastern China:Characteristics and Timing of Transformation[J].Geology in China,2006,33(4):774-775)
[14]谭丽娟,蒋有录.渤海湾盆地东营-惠民凹陷油气成藏模式和油气富集控制因素[J].石油实验地质,2003,25(4):366-374(Tan Lijuan,Jiang Youlu.Pool-Forming Patterns of Hydrocarbon and Controlling Factors of Hydrocarbon Enrichment in the Dongying and the Huimin Sags[J].Petroleum Geology and Experiment,2003,25(4):366-374)