华北上地壳构造单元划分
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摘要
利用天然地震数据分析研究得到的中地壳滑脱层的深度、活动方式、强度等结果,与重磁异常基底解译成果相结合,提出华北地区在中地壳位置发育有区域滑脱面,其特定壳层及深度位置决定了其在华北深浅构造关系转换中,起着"屏蔽"或联系的重要作用,而在华北伸展变形中是地块运动变形的底边界面。上地壳各个部分在沿其滑动时,因速度差、侧向约束条件等的不同,而派生出断叉线、横向调整断裂及相应的凸起、凹陷断块等次级单元。它们构成了华北上地壳基本构造单元,并直接控制着盆山空间分布、构造地貌单元发育。研究提出了华北上地壳构造单元划分方案:上地壳基底构造分为9个一级单元(Ⅰ～Ⅸ)和23个二级单元。其中一级构造单元为:Ⅰ阴山北部东西向区域凹陷断块;Ⅱ阴山—燕山区域凸起断块;Ⅲ太行山区域凸起断块;Ⅳ大别山区域凸起断块;Ⅴ渤海湾盆地断坳、断隆区;Ⅵ南华北盆地断坳、断隆区;Ⅶ鲁西区域断隆区;Ⅷ下扬子区域断坳、断隆区;Ⅸ鄂尔多斯区域断坳区。
By the analysis of natural earthquakes,we obtained the depth,the style of activation,and the strength of the detachment layer in the middle crust.Based on above study and combined with the interpretation of the gravity and magnetic anomalies of the basement of the study region,we propose that there is a regional detachment layer formed in the middle crust in the North China Block,and its depth determines the transition between the shallow and deep deformation in the study region.The detachment layer is the floor boundary of the deformation during the extension of the North China Block.When units of upper crust of the region slip along the detachment layer,owing to different velocities and boundary conditions,the derived cut-off lines,transverse faults and minor related highs and depressions are formed;all these are the basal tectonic units consisting of the upper crust of the North China Block,and they controlled the distribution of the basins and ranges and tectonic landforms basically in the study region.The division scheme of the upper crust in the North China Block is brought forward:there are 9 first-scale units(Ⅰ-Ⅸ)and 23 second-scale units.Among them,the first-scale units are:Ⅰ EW-trending faulted block of the regional depression in the northern Yinshan;Ⅱ faulted block of Yanshan-Yinshan regional high;Ⅲ faulted block of regional Taihangshan high;Ⅳ faulted block of regional Dabieshan high;Ⅴ faulted sags and uplifts in the Bohai Bay basin;Ⅵ faulted sags and uplifts of southern North China basin;Ⅶ regional faulted uplifts in west Shangdong;Ⅷ regional faulted sags and uplifts in the Lower Yangtze;Ⅸ regional faulted sag of the Ordos.
By the analysis of natural earthquakes,we obtained the depth,the style of activation,and the strength of the detachment layer in the middle crust.Based on above study and combined with the interpretation of the gravity and magnetic anomalies of the basement of the study region,we propose that there is a regional detachment layer formed in the middle crust in the North China Block,and its depth determines the transition between the shallow and deep deformation in the study region.The detachment layer is the floor boundary of the deformation during the extension of the North China Block.When units of upper crust of the region slip along the detachment layer,owing to different velocities and boundary conditions,the derived cut-off lines,transverse faults and minor related highs and depressions are formed;all these are the basal tectonic units consisting of the upper crust of the North China Block,and they controlled the distribution of the basins and ranges and tectonic landforms basically in the study region.The division scheme of the upper crust in the North China Block is brought forward:there are 9 first-scale units(Ⅰ-Ⅸ)and 23 second-scale units.Among them,the first-scale units are:Ⅰ EW-trending faulted block of the regional depression in the northern Yinshan;Ⅱ faulted block of Yanshan-Yinshan regional high;Ⅲ faulted block of regional Taihangshan high;Ⅳ faulted block of regional Dabieshan high;Ⅴ faulted sags and uplifts in the Bohai Bay basin;Ⅵ faulted sags and uplifts of southern North China basin;Ⅶ regional faulted uplifts in west Shangdong;Ⅷ regional faulted sags and uplifts in the Lower Yangtze;Ⅸ regional faulted sag of the Ordos.
引文
[1]Zhou L H,Li S Z,Zhao G C,et al.Gravity and magnetic features of crystalline basement in the central and Eastern North China Craton[J].Progress in Geophysics,2004,19(1):91-100(in Chinese).
[2]Liu C Q,Fang S M,Li C F.Joint gravity-seismicinterpreta-tion for Yingxian-Zibo profile[J].Seismology and Geology,1996,8(4):369-374(in Chinese).
[3]Wang C Y,Zhang X K,Wu QJ,et al.Seismic evidence of detachment in north China basin[J].Chinese Journal of Geo-physics,1994,37(5):613-620(in Chinese).
[4]Qi C,Zhao D P,Chen Y,et al.3-D P and S wave velocity structures and their relationship to strong earthquakes in theChinese capital region[J].Chinese Journal of Geophysics,2006,49(3):805-815(in Chinese).
[5]Wei WB,Tan H D,Jin S,et al.Conductivity structure of lithosphere in Central North China:Magnetotelluric study of Yingxian-Shanghe profile[J].Earth Science—Journal of Chi-na University of Geosciences,2002,27(5):645-650(in Chi-nese).
[6]Zhou Y S.Review on the progress in studies on plastic flow of lithosphere and continental intraplate tectonic deformation[J].Recent Developmentsin World Seismology,1999(2):8-13(in Chinese).
[7]Jin Z M,Yao Y P.Beyond plate tectonics:What do we doin structural geology[J]-Earth Science—Journal of China Uni-versity of Geosciences,2006,29(6):644-650(in Chinese).
[8]Dong S W,Wu X Z.On the crust velocitylevels and dynam-ics of the dabieshan orogenic belt[J].Chinese Journal of Geo-physics,1998,41(3):349-361(in Chinese).
[9]Li C,Wang L S,Yang C.Rheological evidence for superim-position of double brittle-ductile transitional zones of the lith-osphereinthe Lower Yangtze Region[J].Geological Review,2001,47(3):245-249(in Chinese).
[10]Zhou Y S,He C R.Rheological parameters of crustal rocks and crustal rheology of North China[J].Seismology and Ge-ology,2003,25(1):109-122(in Chinese).
[11]Li T,Wang Z X.The lithospheric decoupling of the Tarim Basin and surrounding orogenic belts andits relationship with basin-mountain patterns from the analysis of natural earth-quake[J].Earth Science Frontiers,2005,12(3):125-136(in Chinese).
[1]周立宏,李三忠,赵国春,等.华北克拉通中东部基底构造单元的重磁特征[J].地球物理学进展,2004,19(1):91-100.
[2]刘昌铨,方盛明,李长法.应县—淄博剖面重力-地震测深联合解释[J].地震地质,1996,8(4):369-374.
[3]王椿镛,张先康,吴庆举,等.华北盆地滑脱构造的地震学证据[J].地球物理学报,1994,37(5):613-620.
[4]齐诚,赵大鹏,陈颙,等.首都圈地区地壳P波和S波三维速度结构及其与大地震的关系[J].地球物理学报,2006,49(3):805-815.
[5]魏文博,谭捍东,金胜,等.华北中部岩石圈结构——应县—商河剖面大地电磁测深研究[J].地球科学——中国地质大学学报,2002,27(5):645-650.
[6]周永胜.岩石圈塑性流动与大陆板内构造变形研究进展评述[J].国际地震动态,1999(2):8-13.
[7]金振民,姚玉鹏.超越板块构造——我国构造地质学要做些什么[J]-地球科学——中国地质大学学报,2006,29(6):644-650.
[8]董树文,吴宣志.大别造山带地壳速度结构与动力学[J].地球物理学报,1998,41(3):349-361.
[9]李成,王良书,杨春.下扬子区岩石圈双层脆韧性过渡带叠置的流变学证据[J].地质论评,2001,47(3):245-249.
[10]周永胜,何昌荣.地壳主要岩石流变参数及华北地壳流变性质研究[J].地震地质,2003,25(1):109-122.
[11]李涛,王宗秀.塔里木盆地及邻区岩石圈拆离解耦与盆山格局关系的天然地震分析[J].地学前缘,2005,12(3):125-136.
[2]Liu C Q,Fang S M,Li C F.Joint gravity-seismicinterpreta-tion for Yingxian-Zibo profile[J].Seismology and Geology,1996,8(4):369-374(in Chinese).
[3]Wang C Y,Zhang X K,Wu QJ,et al.Seismic evidence of detachment in north China basin[J].Chinese Journal of Geo-physics,1994,37(5):613-620(in Chinese).
[4]Qi C,Zhao D P,Chen Y,et al.3-D P and S wave velocity structures and their relationship to strong earthquakes in theChinese capital region[J].Chinese Journal of Geophysics,2006,49(3):805-815(in Chinese).
[5]Wei WB,Tan H D,Jin S,et al.Conductivity structure of lithosphere in Central North China:Magnetotelluric study of Yingxian-Shanghe profile[J].Earth Science—Journal of Chi-na University of Geosciences,2002,27(5):645-650(in Chi-nese).
[6]Zhou Y S.Review on the progress in studies on plastic flow of lithosphere and continental intraplate tectonic deformation[J].Recent Developmentsin World Seismology,1999(2):8-13(in Chinese).
[7]Jin Z M,Yao Y P.Beyond plate tectonics:What do we doin structural geology[J]-Earth Science—Journal of China Uni-versity of Geosciences,2006,29(6):644-650(in Chinese).
[8]Dong S W,Wu X Z.On the crust velocitylevels and dynam-ics of the dabieshan orogenic belt[J].Chinese Journal of Geo-physics,1998,41(3):349-361(in Chinese).
[9]Li C,Wang L S,Yang C.Rheological evidence for superim-position of double brittle-ductile transitional zones of the lith-osphereinthe Lower Yangtze Region[J].Geological Review,2001,47(3):245-249(in Chinese).
[10]Zhou Y S,He C R.Rheological parameters of crustal rocks and crustal rheology of North China[J].Seismology and Ge-ology,2003,25(1):109-122(in Chinese).
[11]Li T,Wang Z X.The lithospheric decoupling of the Tarim Basin and surrounding orogenic belts andits relationship with basin-mountain patterns from the analysis of natural earth-quake[J].Earth Science Frontiers,2005,12(3):125-136(in Chinese).
[1]周立宏,李三忠,赵国春,等.华北克拉通中东部基底构造单元的重磁特征[J].地球物理学进展,2004,19(1):91-100.
[2]刘昌铨,方盛明,李长法.应县—淄博剖面重力-地震测深联合解释[J].地震地质,1996,8(4):369-374.
[3]王椿镛,张先康,吴庆举,等.华北盆地滑脱构造的地震学证据[J].地球物理学报,1994,37(5):613-620.
[4]齐诚,赵大鹏,陈颙,等.首都圈地区地壳P波和S波三维速度结构及其与大地震的关系[J].地球物理学报,2006,49(3):805-815.
[5]魏文博,谭捍东,金胜,等.华北中部岩石圈结构——应县—商河剖面大地电磁测深研究[J].地球科学——中国地质大学学报,2002,27(5):645-650.
[6]周永胜.岩石圈塑性流动与大陆板内构造变形研究进展评述[J].国际地震动态,1999(2):8-13.
[7]金振民,姚玉鹏.超越板块构造——我国构造地质学要做些什么[J]-地球科学——中国地质大学学报,2006,29(6):644-650.
[8]董树文,吴宣志.大别造山带地壳速度结构与动力学[J].地球物理学报,1998,41(3):349-361.
[9]李成,王良书,杨春.下扬子区岩石圈双层脆韧性过渡带叠置的流变学证据[J].地质论评,2001,47(3):245-249.
[10]周永胜,何昌荣.地壳主要岩石流变参数及华北地壳流变性质研究[J].地震地质,2003,25(1):109-122.
[11]李涛,王宗秀.塔里木盆地及邻区岩石圈拆离解耦与盆山格局关系的天然地震分析[J].地学前缘,2005,12(3):125-136.
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