太行山构造带及其以东地区上地幔地震层析成像
摘要
基于首都圈地区及河北邯郸台网共115个台站记录的地方震、近震和远震P波和S波走时,利用地震层析成像技术得到了太行山构造带及其以东地区下方300km深度范围内的P、S波速度结构。结果发现沿太行山构造带速度结构在上地幔中存在明显的横向不均匀性,其南、中、北段显示了各自不同的构造特征。太行山以东盆地区岩石圈厚度较薄,在约80km深度进入地幔软流层,但在160km深度下,P波和S波速度结构呈现较大差异,其中P波在华北东部地区逐渐以高速为主,而S波速度剖面上虽然低速体被切割,但仍然保持了大部分地区的相对低速。深部结构揭示,太行山中段受华北地区岩石圈减薄过程作用最为强烈,其速度结构与盆地区更为相似。而南段构造作用与浅部断裂关系明显,深部可能更多地保留了构造造山带岩石圈厚度大,高速介质多的特征。太行山北段处于多构造交界地区,速度结构比较复杂,部分S波低速区可能与深部地幔物质上涌作用有关。
Based on P and S wave travel times of local,regional and far earthquakes recorded on 115 station distributed in capital area and Handan network in Hebei Province,P and S wave velocity structures beneath Taihangshan tectonic belt and areas at its east were obtained in the depth of 300km by seismic tomography technology.The results show that,there exists obviously transversal unhomogeneous in upper mantle velocity profiles along Taihangshan tectonic belt,where its southern,middle and northern segments exhibits their different structure features.Beneath the area at the east of Taihangshan,the lithosphere is thin,and the asthenosphere here is at the depth of about 80km.But under the depth of 180km,the P wave velocity structures show large differences in S wave velocity structures,in which at the east area of North China there presents mainly high P wave velocity,while S wave velocity maintains relatively low in most areas of North China basins although the low velocity media is cut by high velocity bodies.The deep structures demonstrate that,the middle segment of Taihangshan had been affected strongly by the lithospheric thinning in North China,and its velocity structure is much consistent with that beneath the basins.While the tectonic activity in southern segment was controlled apparently by shallow faults,but the upper mantle may maintain the character of old orogen with thick lithosphere and more high velocity media in upper mantle.The northern segment of Taihang belt,located at the boundary of multi-tectonic area,is complicated in velocity structure,and part low velocity region may be connected with mantle upwelling.
Based on P and S wave travel times of local,regional and far earthquakes recorded on 115 station distributed in capital area and Handan network in Hebei Province,P and S wave velocity structures beneath Taihangshan tectonic belt and areas at its east were obtained in the depth of 300km by seismic tomography technology.The results show that,there exists obviously transversal unhomogeneous in upper mantle velocity profiles along Taihangshan tectonic belt,where its southern,middle and northern segments exhibits their different structure features.Beneath the area at the east of Taihangshan,the lithosphere is thin,and the asthenosphere here is at the depth of about 80km.But under the depth of 180km,the P wave velocity structures show large differences in S wave velocity structures,in which at the east area of North China there presents mainly high P wave velocity,while S wave velocity maintains relatively low in most areas of North China basins although the low velocity media is cut by high velocity bodies.The deep structures demonstrate that,the middle segment of Taihangshan had been affected strongly by the lithospheric thinning in North China,and its velocity structure is much consistent with that beneath the basins.While the tectonic activity in southern segment was controlled apparently by shallow faults,but the upper mantle may maintain the character of old orogen with thick lithosphere and more high velocity media in upper mantle.The northern segment of Taihang belt,located at the boundary of multi-tectonic area,is complicated in velocity structure,and part low velocity region may be connected with mantle upwelling.
引文
张学民.2005.华北地区壳幔剪切波速度结构及与晚新生代地质演化关系研究.北京:中国地质大学博士学位论文.
邓前辉,王继军,汤吉,詹艳,孙洁,李国深,肖思东,洪飞,叶青.2001.三河-平谷8级大震区地壳上地幔电性结构特征研究.地震地质,23(2):178～185.
嘉世旭,张先康.2005.华北不同构造块体地壳结构及其对比研究.地球物理学报,48(3):611～620.
罗照华,邓晋福,赵国春,曹永清.1997.太行山造山带岩浆活动特征及其造山过程反演.地球科学——中国地质大学学报,22(3):279～284.
李志伟,胥颐,郝天珧,刘劲松,张岭.2006.环渤海地区的地震层析成像与地壳上地幔结构.地球物理学报,49(3):797～804.
李延兴,徐杰,陈聚忠,张静华,张中伏.2006.邢台、渤海、海城和唐山大地震震中区现今应变场的基本特征.华北地震科学,24(2):36～39.
刘占坡,高祥林,黎益仕.2003.太行山重力梯级带的密度结构及其地质解释.地震地质,25(2):266～272.
马宗晋,王国权.1999.中国东部现今岩石圈结构的板条构造分区.高校地质学报,5(1):7～16.
马宗晋,高祥林,宋正范.2006.中国布格重力异常水平梯度图的判读和构造解释.地球物理学报,49(1):106～114.
牛树银,董国润,许传诗.1995.论太行山构造岩浆带的岩浆来源及其成因.地质论评,41(4):301～310.
任纪舜,牛宝贵,和政军.1997.中国东部的构造格局和动力演化.地学研究,29-30:43～55.
王春华,廖素琼,徐杰,盛淑珍.1991.华北东部地区上地幔运动与盆地形成关系的模拟研究.地震地质,13(3):276～282.
汪素云,许忠淮,裴顺平.2003.华北地区上地幔顶部Pn波速度结构及其构造含义.中国科学D辑,33(增刊),91～98.
徐杰,高战武,宋长青,孙建宝.2000.太行山山前断裂带的构造特征.地震地质,22(2):111～122.
徐杰,高战武,孙建宝,宋长青.2001.区域伸展体制下盆-山构造耦合关系的探讨.地质学报,75(2):165～174.
徐义刚.2006.太行山重力梯度带的形成与华北岩石圈减薄的时空差异性有关.地球科学——中国地质大学学报,31(1):14～21.
杨宝俊,刘万崧,王喜臣,李勤学,王建民,赵雪平.2005.中国东部大兴安岭重力梯级带地球物理场特征及其成因.地球物理学报,48(1):86～97.
杨文采,张学民,于长青.2007.华北东部上地幔破裂带.地质学报,81(10):1305～1312.
张岭,刘劲松,郝天珧,刘建华,胥颐.2007.渤海湾盆地及其邻域地区地壳与上地幔层析成像.中国科学D辑,37(11):1444～1455.
张学民,刁桂苓,赵英萍,王卫民,束沛镒.2006.华北地区深部地幔剪切波速度结构研究.地球物理学报,49(6),1709～1719.
赵国泽,刘铁胜,江钊,汤吉,徐常芳,詹艳,白登海,刘国栋.1997.山西阳高-河北容城剖面大地电磁资料的二维反演解释.地球物理学报,40(1):38～45.
Huang J L,Zhao D P.2006.High-resolution mantle tomography ofChina and surrounding regions.J Geophys.Res.,111,B09305:1～21.
Kennett B L.1991.IASPEI911991seismological tables.ResearchSchool of Earth Sciences,Australian National University,Canberra,167.
Xu P F,Zhao D P.2009.Upper-mantle velocity structure beneaththe North China Craton:implications for lithospheric thinning.Geophysical Journal International,177:1279～1283.
Zhao D,Hasegawa A,Horiuchi S.1992.Tomographic Imaging ofP and S wave velocity structure beneath northeastern Japan.J.Geophys.Res.,97:19909～19928.
hao D,Hasegawa A,Kanamori H.1994.Deep structure of Japansubduction zone as derived from local,regional and teleseismic events.J.Geophys.Res.,99,22313～22329.
Zhao D P.2004.Global tomographyic images of mantle plumes and subducting slabs:insight into deep Earth dynamics.Phys EarthPlanet.Inter.,146,3～34.
邓前辉,王继军,汤吉,詹艳,孙洁,李国深,肖思东,洪飞,叶青.2001.三河-平谷8级大震区地壳上地幔电性结构特征研究.地震地质,23(2):178～185.
嘉世旭,张先康.2005.华北不同构造块体地壳结构及其对比研究.地球物理学报,48(3):611～620.
罗照华,邓晋福,赵国春,曹永清.1997.太行山造山带岩浆活动特征及其造山过程反演.地球科学——中国地质大学学报,22(3):279～284.
李志伟,胥颐,郝天珧,刘劲松,张岭.2006.环渤海地区的地震层析成像与地壳上地幔结构.地球物理学报,49(3):797～804.
李延兴,徐杰,陈聚忠,张静华,张中伏.2006.邢台、渤海、海城和唐山大地震震中区现今应变场的基本特征.华北地震科学,24(2):36～39.
刘占坡,高祥林,黎益仕.2003.太行山重力梯级带的密度结构及其地质解释.地震地质,25(2):266～272.
马宗晋,王国权.1999.中国东部现今岩石圈结构的板条构造分区.高校地质学报,5(1):7～16.
马宗晋,高祥林,宋正范.2006.中国布格重力异常水平梯度图的判读和构造解释.地球物理学报,49(1):106～114.
牛树银,董国润,许传诗.1995.论太行山构造岩浆带的岩浆来源及其成因.地质论评,41(4):301～310.
任纪舜,牛宝贵,和政军.1997.中国东部的构造格局和动力演化.地学研究,29-30:43～55.
王春华,廖素琼,徐杰,盛淑珍.1991.华北东部地区上地幔运动与盆地形成关系的模拟研究.地震地质,13(3):276～282.
汪素云,许忠淮,裴顺平.2003.华北地区上地幔顶部Pn波速度结构及其构造含义.中国科学D辑,33(增刊),91～98.
徐杰,高战武,宋长青,孙建宝.2000.太行山山前断裂带的构造特征.地震地质,22(2):111～122.
徐杰,高战武,孙建宝,宋长青.2001.区域伸展体制下盆-山构造耦合关系的探讨.地质学报,75(2):165～174.
徐义刚.2006.太行山重力梯度带的形成与华北岩石圈减薄的时空差异性有关.地球科学——中国地质大学学报,31(1):14～21.
杨宝俊,刘万崧,王喜臣,李勤学,王建民,赵雪平.2005.中国东部大兴安岭重力梯级带地球物理场特征及其成因.地球物理学报,48(1):86～97.
杨文采,张学民,于长青.2007.华北东部上地幔破裂带.地质学报,81(10):1305～1312.
张岭,刘劲松,郝天珧,刘建华,胥颐.2007.渤海湾盆地及其邻域地区地壳与上地幔层析成像.中国科学D辑,37(11):1444～1455.
张学民,刁桂苓,赵英萍,王卫民,束沛镒.2006.华北地区深部地幔剪切波速度结构研究.地球物理学报,49(6),1709～1719.
赵国泽,刘铁胜,江钊,汤吉,徐常芳,詹艳,白登海,刘国栋.1997.山西阳高-河北容城剖面大地电磁资料的二维反演解释.地球物理学报,40(1):38～45.
Huang J L,Zhao D P.2006.High-resolution mantle tomography ofChina and surrounding regions.J Geophys.Res.,111,B09305:1～21.
Kennett B L.1991.IASPEI911991seismological tables.ResearchSchool of Earth Sciences,Australian National University,Canberra,167.
Xu P F,Zhao D P.2009.Upper-mantle velocity structure beneaththe North China Craton:implications for lithospheric thinning.Geophysical Journal International,177:1279～1283.
Zhao D,Hasegawa A,Horiuchi S.1992.Tomographic Imaging ofP and S wave velocity structure beneath northeastern Japan.J.Geophys.Res.,97:19909～19928.
hao D,Hasegawa A,Kanamori H.1994.Deep structure of Japansubduction zone as derived from local,regional and teleseismic events.J.Geophys.Res.,99,22313～22329.
Zhao D P.2004.Global tomographyic images of mantle plumes and subducting slabs:insight into deep Earth dynamics.Phys EarthPlanet.Inter.,146,3～34.
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