用远震接收函数研究山西地区地壳厚度变化:“晋中坡折带”及其地质意义探讨
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摘要
利用山西数字地震台网中心6年的远震数据计算接收函数并进行H-k搜索,以获得台站下方的地壳厚度.结果表明,山西地区在平遥盆地北缘的文水晋中一线,地壳厚度存在北厚南薄差异变化的坡折带,称之为"晋中坡折带".该带呈NEE向延伸,其南部地区地壳厚度37～40 km,北部地区厚41～45 km.本文分析认为,该坡折带代表早前寒武纪基底构造,是华北克拉通内部的重要构造边界.山西地区基底构造保存完好,地壳厚度未明显减薄.
Seismic data collected by Shanxi Digital Seismic Network during a six-year time period were used to compute crustal thickness using the receiver function method and H-k search.The results show that at the northern margin of Pingyao Basin in Shanxi region,there exists a transition belt along the line between Wenshui and Jinzhong,called Jinzhong transition belt.The belt acts as a dividing line between the south thin crust (about 37～40 km) and the north thick crust (about 41～45 km) trending in NEE direction.We consider this transition belt being related to early precambrian basement structure and an important tectonic boundary inside the North China Craton.In this region,the basement structure is well-preserved and the crust is relatively thick.
Seismic data collected by Shanxi Digital Seismic Network during a six-year time period were used to compute crustal thickness using the receiver function method and H-k search.The results show that at the northern margin of Pingyao Basin in Shanxi region,there exists a transition belt along the line between Wenshui and Jinzhong,called Jinzhong transition belt.The belt acts as a dividing line between the south thin crust (about 37～40 km) and the north thick crust (about 41～45 km) trending in NEE direction.We consider this transition belt being related to early precambrian basement structure and an important tectonic boundary inside the North China Craton.In this region,the basement structure is well-preserved and the crust is relatively thick.
引文
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[12] 赵金仁,张先康,张成科等.山西五台山地区地壳深部结构特征研究.地球物理学报,2006,49(1) :123～129 Zhao J R,Zhang X K,Zhang C K,et al.Features of deep crustal structure beneath the Wutai mountain area of Shanxi province.Chinese J.Geophys.(in Chinese),2006,49(1) :123～129
[13] 魏文博,叶高峰,金胜等.华北地区地壳P波三维速度结 构.地球科学-中国地质大学学报,2007,32(4) :441～452 Wei W B,Ye G F,Jin S,et al.Three dimensional P-wave velocity structure of the crust of North China.Earth Science-Journal of China University of Geosciences (in Chinese),2007,32(4) ,441 ～ 452
[14] 嘉世旭,张先康.华北不同构造块体地壳结构及其对比研究.地球物理学报,2005,48(3) :611～620 Jia S X,Zhang X K.Crustal structure and comparison of different tectonic blocks in North.Chinese J.Geophys.(in Chinese) ,2005,48(3) :611 ～ 620
[15] Xu P F,Zhao D P.Upper-mantle velocity structure beneath the North China Craton:Implications for lithospheric thinning.Geophys.J.Int.,2009 ,177(3) :1279～1283
[16] Zheng T Y,Zhao L,Zhu R X.New evidence from seismic imaging for subduction during assembly of the North China craton.Geology,2009 ,37(5) :395 ～ 398
[17] Zhao G C,Wilde S A,Cawood P A,et al.Archean blocks and their boundaries in the North China Craton:lithological,geochemical,structural and P-T path constraints and tectonic evolution.Precambrian Res.,2001,107(1-2) :45 ～ 73
[2] 徐杰,高战武,宋长青等.太行山山前断裂带的构造特征.地震地质,2000,22(2) :111～122 Xu J,Gao Z W,Song C Q,et al.The structural characters of the piedmont fault zone of the Taihang mountain.Seismology and Geology (in Chinese) ,2000,22(2) :111～122
[3] 马杏垣主编.中国岩石圈动力学地图集.北京:中国地图出版社,1989 Ma X Y.Lithospheric Dynamics Atlas of China (in Chinese).Beijing:China Cartographic Publishing House,1989
[4] 杨巍然,孙继源,纪克诚等.大陆裂谷对比:汾渭裂谷系与贝加尔裂谷系例析.武汉:中国地质大学出版社,1995 Yang W R,Sun J Y,Ji K C,et al.Comparison for Contienetal Rifts:Analysis of the Fenwei and Baikal Rift Systems (in Chinese).Wuhan:China University of Geosccience Press,1995
[5] Zhu L P,Kanamori H.Moho depth variation in southern California from teleseismic receiver functions.Journal of Geophysical Research-Solid Earth ,2000,105(B2) :2969 ～2980
[6] 许卫卫,郑天愉.渤海湾盆地北西盆山边界地区泊松比分布.地球物理学报,2005,48(5) :1077～1084 Xu W W,Zheng T Y.Distribution of Poisson's ratios in the northwestern basin-mountain boundary of the Bohai Bay Basin.Chinese J.Geophys (in Chinese) ,2005,48(5) :1077 ～1084
[7] Kumar M R,Raju P S,Devi E U,et al.Crustal structure variations in northeast India from converted phases.Geophy.Res.Lett.,2004,31 ,L17605 ,doi:10． 1029/2004GL020576
[8] 吴庆举,田小波,张乃铃等.计算台站接收函数的最大熵谱反褶积方法.地震学报,2003,25(4) :382～389 Wu Q J,Tian X B,Zhang N L,et al.Receiver function estimated by maximum entropy deconvolution.Acta Seismologica Sinica (in Chinese) ,2003,25(4) :382 ～ 389
[9] Owens T J,Crosson R S.Shallow structure effects on broadband teleseismic P-waveforms.Bulletin of the Seismological Society of American,1988,78(1) :96 ～ 108
[10] 祝治平,张建狮,张成科等.山西中南部壳幔结构的研究.地震学报,1999,21(1) :42～49 Zhu Z P,Zhang J S,Zhang C K,et al .Study on the crust and mantle structure in the central and southern parts of Shanxi.Acta Seismologica Sinica (in Chinese),1999,21 (1) :42 ～ 49
[11] 张建狮,祝治平,张先康等.山西高原北部地壳上地幔地震波速结构与深部构造.地震地质,1997,19(3) :220～226 Zhang J S,Zhu Z P,Zhang X K,et al.The seismic velocity structure of crust and upper mantle and deep structure feature in North Shanxi plateau.Seismology and Geology ( in Chinese) ,1997,19(3) :220～226
[12] 赵金仁,张先康,张成科等.山西五台山地区地壳深部结构特征研究.地球物理学报,2006,49(1) :123～129 Zhao J R,Zhang X K,Zhang C K,et al.Features of deep crustal structure beneath the Wutai mountain area of Shanxi province.Chinese J.Geophys.(in Chinese),2006,49(1) :123～129
[13] 魏文博,叶高峰,金胜等.华北地区地壳P波三维速度结 构.地球科学-中国地质大学学报,2007,32(4) :441～452 Wei W B,Ye G F,Jin S,et al.Three dimensional P-wave velocity structure of the crust of North China.Earth Science-Journal of China University of Geosciences (in Chinese),2007,32(4) ,441 ～ 452
[14] 嘉世旭,张先康.华北不同构造块体地壳结构及其对比研究.地球物理学报,2005,48(3) :611～620 Jia S X,Zhang X K.Crustal structure and comparison of different tectonic blocks in North.Chinese J.Geophys.(in Chinese) ,2005,48(3) :611 ～ 620
[15] Xu P F,Zhao D P.Upper-mantle velocity structure beneath the North China Craton:Implications for lithospheric thinning.Geophys.J.Int.,2009 ,177(3) :1279～1283
[16] Zheng T Y,Zhao L,Zhu R X.New evidence from seismic imaging for subduction during assembly of the North China craton.Geology,2009 ,37(5) :395 ～ 398
[17] Zhao G C,Wilde S A,Cawood P A,et al.Archean blocks and their boundaries in the North China Craton:lithological,geochemical,structural and P-T path constraints and tectonic evolution.Precambrian Res.,2001,107(1-2) :45 ～ 73
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