太行山构造带壳幔结构分段性特征
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摘要
分别利用纯S波波形反演和T函数法计算了太行山构造带及其邻近地区100km以上的壳幔剪切波速度结构,结果显示太行山构造带在南、中、北段的壳幔结构存在明显差异。南段邢台邯郸地区地壳中比较突出的特点是下地壳存在一个厚度近10km的低速层;中段石家庄—保定地区靠近山脉的各台地壳结构相对比较稳定,越向盆地区发展,结构愈加复杂化;北段到达北京地区,由于该区是太行山与燕山构造带的交汇地区,中下地壳出现薄高低速转换层位,呈现不稳定状态。沿太行山构造带东缘是地震活动带-河北平原地震带,通过对比速度结构与地震空间分布,发现不同区段小震分布特点与地下低速或不稳定结构关系密切。结合该区域上地幔速度结构特征,认为太行山中段与华北地区中新生代以来的岩石圈大规模减薄运动关系密切,而南北两段当前地幔物质比较活跃,构造运动相对更为强烈。
The crustal and mantle shear wave velocity structures 100km beneath Taihang Mountain and its neighboring areas were calculated with pure S wave inversion and T function method.The results show that there is obvious difference in the crust and mantle structures at the southern,middle and northern part of Taihang tectonic zone.In the southern segment,Xingtai and Handan region,there is a 10km low velocity layer in the lower crust.In the middle segment,Shijiazhuang to Baoding region,the crustal structures near the mountain is relatively steady,but it becomes complicated toward to the basin.The northern segment,Beijing area,which is the crossing region of Taihang and Yanshan tectonic belt,shows an unstable state.Some alternated layers with high and low velocity appear in the middle and lower crust of the segment.The eastern boundary of Taihang tectonic belt is the seismically active belt-Hebei plain seismic belt.Compared the velocity structures with the distribution of earthquakes,it is found that the characteristic in the distribution of small earthquakes on different segment is closely related to the low velocity layer or unstable structures.Combined with upper mantle velocity structures beneath this area,it is thought that,the middle segment of Taihang Mountain may be correlated to the large scale lithospheric thinning activity in North China since Mesozoic and Cenozoic,while beneath the southern and northern segments,the mantle media is active at present time,and tectonic activity is stronger.
The crustal and mantle shear wave velocity structures 100km beneath Taihang Mountain and its neighboring areas were calculated with pure S wave inversion and T function method.The results show that there is obvious difference in the crust and mantle structures at the southern,middle and northern part of Taihang tectonic zone.In the southern segment,Xingtai and Handan region,there is a 10km low velocity layer in the lower crust.In the middle segment,Shijiazhuang to Baoding region,the crustal structures near the mountain is relatively steady,but it becomes complicated toward to the basin.The northern segment,Beijing area,which is the crossing region of Taihang and Yanshan tectonic belt,shows an unstable state.Some alternated layers with high and low velocity appear in the middle and lower crust of the segment.The eastern boundary of Taihang tectonic belt is the seismically active belt-Hebei plain seismic belt.Compared the velocity structures with the distribution of earthquakes,it is found that the characteristic in the distribution of small earthquakes on different segment is closely related to the low velocity layer or unstable structures.Combined with upper mantle velocity structures beneath this area,it is thought that,the middle segment of Taihang Mountain may be correlated to the large scale lithospheric thinning activity in North China since Mesozoic and Cenozoic,while beneath the southern and northern segments,the mantle media is active at present time,and tectonic activity is stronger.
引文
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[14]张学民,刁桂苓,束沛镒,等.苏鲁地区剪切波速度结构及与地震关系探讨[J].西北地震学报,2005,27(2):101-108.
[15]Efron B,Tibshirani J T.An introduction to the Bootstrap.New York:Chapman and Hall[M],1993.
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[18]张家茹,邵学忠,章思亚,等.邢台强震的深部三维构造背景和孕震条件[J].地震地质,1994,16(4):317-328.
[19]张先康,祝治平,张成科等.张家口-渤海地震带及其两侧地壳上地幔构造与速度结构研究.国家地震局地质研究所编,活动断裂研究(6)[M],北京:地震出版社,1998,1-16.
[20]汪素云,许忠淮.中国东部大陆的地震构造应力场[J].地震学报,1985,7(1):17-32.
[21]邵学钟,张家茹,张思亚,等.邢台地震区身部构造背景的地震转换波探测和研究[J].地球物理学报,1993,36(5):609-619.
[22]王椿镛,张先康,吴庆举,祝治平,华北盆地滑脱构造的地震学证据,地球物理学报[J],1994,37(5):613-620.
[23]徐锡伟,吴为民,张先康,等.华北地区地壳最新构造变动与地震[M].北京:科学出版社,2002.
[24]张学民,刁桂苓,束沛镒,等.华北地区地下介质波速比值(Vp/Vs)研究[J],地震地质,2004,26(2):305-317.
[25]藏绍先,刘永刚,宁杰远.华北地区岩石圈热结构研究[J].地球物理学报,2002,45(2):56-66.
[26]李延兴,徐杰,陈聚忠,等.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[J],2006,24(2):36-39.
[27]滕吉文,固体地球物理学概论[M],北京:地震出版社,2003.500-525.
[2]刘占坡,高祥林,黎益仕.太行山重力梯级带的密度结构及其地质解释[J].地震地质,2003,25(2):266-273.
[3]魏文博,谭捍东,金胜,等.华北中部岩石圈电性结构—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.
[4]嘉世旭,张先康,方盛明.华北裂陷盆地不同块体地壳结构及演化研究[J].地学前缘,2001,8(2):259-266.
[5]Ma,X.Y.and Wu,D.N.Cenozoic extensional tectonics in China.Tectonophysics[M],1987,133,243-255.
[6]马杏垣.中国岩石圈动力学地图集[M].北京:中国地图出版社,1989.
[7]Ren,J.S.The continental tectonics of China[M].Journal of southeast Asian Earth Sciences,1996,13,197-204.
[8]王瑜.中生代以来华北造山带与盆地演化动力学[M].北京:地质出版社,1998.
[9]Ye kai,Hirajima T,Ishiwatari A,et al.The discovery of intergranular coesite in elogite of Yangkou,Qingdao and its significance.Chinese Sci-ence Bulletin[J],1996,41(15):1407-1408.
[10]牛树银,陈路,许传诗.太行山区地壳演化及成矿规律[M].北京:地震出版社,1994.
[11]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成因[J].地质论评,41(4):301-310.
[12]Zhang Xuemin,Shu Peiyi,Li Youming et al.Study on shear wave velocity structure beneath seismic stations by inputting pure S wave,ChineseGeophysical Journal[J],2002,45(1):63-71.
[13]张学民,刁桂苓,赵英萍,等.华北地区深部地幔剪切波速度结构研究[J].地球物理学报,2006,49(6):1709-1719.
[14]张学民,刁桂苓,束沛镒,等.苏鲁地区剪切波速度结构及与地震关系探讨[J].西北地震学报,2005,27(2):101-108.
[15]Efron B,Tibshirani J T.An introduction to the Bootstrap.New York:Chapman and Hall[M],1993.
[16]Matheus M,Segall P.Statistical inversion of crustal deformation data and estimation of the depth distribution of slip in the 1906 earthquake.JGeophys.Res[J].1993,98:12153-12163.
[17]徐杰,高战武,宋长青,等.太行山山前断裂带的构造特征[J].地震地质,2000,22(2):111-122.
[18]张家茹,邵学忠,章思亚,等.邢台强震的深部三维构造背景和孕震条件[J].地震地质,1994,16(4):317-328.
[19]张先康,祝治平,张成科等.张家口-渤海地震带及其两侧地壳上地幔构造与速度结构研究.国家地震局地质研究所编,活动断裂研究(6)[M],北京:地震出版社,1998,1-16.
[20]汪素云,许忠淮.中国东部大陆的地震构造应力场[J].地震学报,1985,7(1):17-32.
[21]邵学钟,张家茹,张思亚,等.邢台地震区身部构造背景的地震转换波探测和研究[J].地球物理学报,1993,36(5):609-619.
[22]王椿镛,张先康,吴庆举,祝治平,华北盆地滑脱构造的地震学证据,地球物理学报[J],1994,37(5):613-620.
[23]徐锡伟,吴为民,张先康,等.华北地区地壳最新构造变动与地震[M].北京:科学出版社,2002.
[24]张学民,刁桂苓,束沛镒,等.华北地区地下介质波速比值(Vp/Vs)研究[J],地震地质,2004,26(2):305-317.
[25]藏绍先,刘永刚,宁杰远.华北地区岩石圈热结构研究[J].地球物理学报,2002,45(2):56-66.
[26]李延兴,徐杰,陈聚忠,等.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[J],2006,24(2):36-39.
[27]滕吉文,固体地球物理学概论[M],北京:地震出版社,2003.500-525.
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