苏鲁—大别造山带及其周围现代地壳应力场与构造运动区域特征
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摘要
苏鲁-大别造山带是中国东部华北、华南地块之间的大地构造交界带。本文分析研究了我国东部的地震活动性,并根据1918~2005年间苏鲁-大别及其周围地区发生的1000余个地震的震源机制解,系统研究了应力场的区域特征以及华北、华南地壳应力场构造分区,探讨了其动力学来源以及构造运动特征。结果表明,中国东部大陆华北、华南地块地壳现代应力场和构造运动可以归结为太平洋板块和菲律宾海板块与欧亚板块之间相对运动,以及大陆板内区域块体之间相互作用的结果。华北地区受到太平洋板块向欧亚板块俯冲挤压的同时,受到从贝加尔湖经过大华北直到琉球海沟的广阔地域里存在着的统一的、方位为170°的引张应力场的控制。华北地区大地震的震源机制解均反映出震源应力场为ENE向挤压应力和NNW向张应力的共同作用。郯庐断裂带等华北地区的北北东走向的断裂带,表现为右旋走滑的现代构造运动特征。来自台湾纵谷的北西西向挤压应力控制了华南块体直至南北地震带南段东部地域的地壳应力场。本文研究结果表明,将中国东部大陆划分成华北、华南两部分的现代地壳应力场分界线,其西部大致与秦岭带相同,然而在大别及其以东地区则逐渐偏离大地构造带,到北纬30°后向东南偏转,在温州附近的北纬27°左右转为向东延伸,最终穿过东海直至琉球海沟。
The Sulu-Dabie orogen belt is a tectonic boundary between the North and the South China. In present paper, the regional characteristics of seismic activity, the modern crustal stress field, tectonic motions and its dynamics have been analyzed in East China in detail based on the focal mechanism solutions of more than 1000 middle and great earthquakes occurred during 1918 and 2005. The results suggest that the crustal stress field and tectonic movement in the North China and the South China are attributable to relative motions among the Pacific Ocean, the Philippine Sea and the Eurasian plates, and interactions along blocks of mainland. The North China are controlled by the compressive stress in a NEE direction due to subduction of the Pacific Ocean plate and the identical tensile stress in 170° in a broad region from the Baikal to the Ryukyu trench throughout the North China. The mechanism solutions of large events occurred in the North China showed that they were attributed to the action of the compressive in the NEE direction and the tensile in the NNW direction. The earthquakes occurred along the Tancheng-Lujiang fault and others with the NNE tend towards in the North China were caused by the right strike-slip faults, which also shows the characteristics of tectonic movement here. The compressive force in a NWW direction from the Longitudinal valley in Taiwan controls the crustal stress field in the South China up to the eastern region of southern part of the North-South Seismic Belt (NSB). The results obtained in this study show that there is a boundary of regional crustal stress field between the North China and the South China. This boundary mainly consistent with the Qinling belt in its western part, however, it deviates in and east of the Dabie belt and turns to the south-east at 30°N, passes the Wenzhou area at 27°N, throughout the East Sea of China, finally up to the Ryukyu trench.
The Sulu-Dabie orogen belt is a tectonic boundary between the North and the South China. In present paper, the regional characteristics of seismic activity, the modern crustal stress field, tectonic motions and its dynamics have been analyzed in East China in detail based on the focal mechanism solutions of more than 1000 middle and great earthquakes occurred during 1918 and 2005. The results suggest that the crustal stress field and tectonic movement in the North China and the South China are attributable to relative motions among the Pacific Ocean, the Philippine Sea and the Eurasian plates, and interactions along blocks of mainland. The North China are controlled by the compressive stress in a NEE direction due to subduction of the Pacific Ocean plate and the identical tensile stress in 170° in a broad region from the Baikal to the Ryukyu trench throughout the North China. The mechanism solutions of large events occurred in the North China showed that they were attributed to the action of the compressive in the NEE direction and the tensile in the NNW direction. The earthquakes occurred along the Tancheng-Lujiang fault and others with the NNE tend towards in the North China were caused by the right strike-slip faults, which also shows the characteristics of tectonic movement here. The compressive force in a NWW direction from the Longitudinal valley in Taiwan controls the crustal stress field in the South China up to the eastern region of southern part of the North-South Seismic Belt (NSB). The results obtained in this study show that there is a boundary of regional crustal stress field between the North China and the South China. This boundary mainly consistent with the Qinling belt in its western part, however, it deviates in and east of the Dabie belt and turns to the south-east at 30°N, passes the Wenzhou area at 27°N, throughout the East Sea of China, finally up to the Ryukyu trench.
引文
马丽芳.2002.中国地质图集.北京:地质出版社.
滕吉文,闫雅芬,王光杰,等.2006.大别造山带与郯庐断裂带壳、幔结构和陆内“俯冲”的耦合效应.地球物理学报,49(2):449~457.
徐纪人,尾池和夫.1995.南北地震带南段应力场特征及其与板块运动的关系.地震学报,17(1):31~40.
徐纪人,杨文采,赵志新,等.2003.苏鲁大别造山带岩石圈三维P波速度结构特征.地质学报,77(4):577~582
徐纪人,赵志新.2004.苏鲁造山带区域地壳山根结构特征.岩石学报,20(1):137~144.
徐纪人,赵志新.2006.中国岩石圈应力场与构造运动区域特征.中国地质,33(4):782~792.
许志琴,张泽明,刘福来,等.2003.苏鲁高压-超高压变质带演化的折返构造及折返机制.地质学报,77(4):433~450.
许忠淮.2001.东亚地区现今构造应力图的编制.地震学报,23(5):492~501.
薛棋福.2002.中国震例(1997~1999).北京:地震出版社.
杨经绥,许志琴,吴才来,等.2002.含柯石英锆石的SHIRIMP U-Pb定年:胶东印支期超高压变质作用的证据.地质学报,76(3):355~372.
张肇诚.1988.中国震例(1966~1975).北京:地震出版社.
赵志新,松村一男,尾池和夫,等.1987a.东アジアにおける地震活动变化の地域特征と关连性いて、(1)中国华北から日本海清へいたる地域.地震,第2辑,40:383~392.
赵志新,松村一男,尾池和夫,等.1987b.东アジアにおける地震活动变化の地域特性について、(2)台湾から华南へいたる地域.地震,第2辑,40:593~604.
赵志新,徐纪人,许志琴.2004.上地幔三维S波速度结构与大别苏鲁超高压变质带俯冲折返机制探讨.岩石学报,20(1):145~152.
中央地震工作小组办公室.1971.中国地震目录.北京:科学出版社.
朱光,宋传中,王道轩,等.2001.郯庐断裂带走滑时代的40Ar/39Ar年代学研究及其构造意义.中国科学(D辑),31(3):250~256.
Haker B R,Ratschitecyur L,Webb L,Ireland T,Walker D,DongShuwen.1998.U/Pb zircon ages constrain the architecyure ofthe ultrahigh-pressure Qinling-Dabie Orogen,China.Earth andPlanetary Science Letters,161:215~230.
Ma Lifang.2002.Geological maps of China.Beijing:GeologicalPublishing House(in Chinese).
The Central Earthquake Office of China.1971.Earthquake Catalog ofChina.Beijing:Science Press(in Chinese).
Tong J W,Yan Y F,Wang G J,et al.2006.Structure of Earth'scrust and upper mantle,inland subduction and its coupling effectson Dabie orogenic belt and the Tangcheng-Lujiang fault zone.Chinese J.Geophys.,49(2):449~457(in Chinese with Englishabstract).
Xu Jiren,Oike Kazuo.1995.Earthquake mechanisms and itsimplication for tectonic stress field in the southern part of theNorth-South Seismic Belt in China.Acta Seismologica Sinica,17(1):31~40(in Chinese with English abstract).
Xu Jiren,Zhao Zhixin,Oike Kazuo.2002.Tectonics characteristics ofseismogenic stress field in East Asia.In:Fujinawa Y,Oshida A,eds.Seismotectonics in Convergent Plate Boundary.Tokyo:Terra Scientific Publishing Company,481~497.
Xu Jiren,Yang Wencai,Zhao Zhixin,et al.2003.Three-dimensionalvelocity structure of the Sulu-Dabie orogen belt.Acta GeologicaSinica,77(4):577~582(in Chinese with English abstract).
Xu Zhiqin,Zhang Zeming,Liu Fulai,et al.2003.Exhumationstructure and mechanism of the Sulu ultrahigh pressuremetamorphic belt,central China.Acta Geologica Sinica,77(4):433~450(in Chinese with English abstract).
Xu Zhonghuai.2001.A present-day tectonic stress map for easternAsia region.Acta Seismologica Sinica,23(5):492~501(inChinese with English abstract).
Xue Qifu.2002.Earthquake Cases in China(1997~1999).Beijing:Seismological Publishing House(in Chinese).
Yang Jingsui,Xu Zhiqin,Wu Cailai,et al.2002.SHRIMP U-Pb oncoesite-bearing zircon:Evidence for Indosinian ultrahigh-pressuremetamorphism in Su-Lu,East China.Acta Geologica Sinica,76(3):355~372(in Chinese with English abstract)
Zhang Zhaocheng.1988.Earthquake Cases in China(1966~1975).Beijing:Seismological Publishing House(in Chinese).
Zhao Zhixin,Kazuo Oike,Kazuo Matsumura,Yuzo Ishikawa.1990.Stress field in the continental part of China--Derived fromtemporal variations of seismic activity.Tectonophysics,178:357~372.
Zhu Guang,Song Chuanzhong,Wang Daoxuan,et al.2001.Studyon40Ar/39Ar ages of the strike-slip in the Tanlu Fold.Science inChina(Series D),31(3):250~256(in Chinese).
滕吉文,闫雅芬,王光杰,等.2006.大别造山带与郯庐断裂带壳、幔结构和陆内“俯冲”的耦合效应.地球物理学报,49(2):449~457.
徐纪人,尾池和夫.1995.南北地震带南段应力场特征及其与板块运动的关系.地震学报,17(1):31~40.
徐纪人,杨文采,赵志新,等.2003.苏鲁大别造山带岩石圈三维P波速度结构特征.地质学报,77(4):577~582
徐纪人,赵志新.2004.苏鲁造山带区域地壳山根结构特征.岩石学报,20(1):137~144.
徐纪人,赵志新.2006.中国岩石圈应力场与构造运动区域特征.中国地质,33(4):782~792.
许志琴,张泽明,刘福来,等.2003.苏鲁高压-超高压变质带演化的折返构造及折返机制.地质学报,77(4):433~450.
许忠淮.2001.东亚地区现今构造应力图的编制.地震学报,23(5):492~501.
薛棋福.2002.中国震例(1997~1999).北京:地震出版社.
杨经绥,许志琴,吴才来,等.2002.含柯石英锆石的SHIRIMP U-Pb定年:胶东印支期超高压变质作用的证据.地质学报,76(3):355~372.
张肇诚.1988.中国震例(1966~1975).北京:地震出版社.
赵志新,松村一男,尾池和夫,等.1987a.东アジアにおける地震活动变化の地域特征と关连性いて、(1)中国华北から日本海清へいたる地域.地震,第2辑,40:383~392.
赵志新,松村一男,尾池和夫,等.1987b.东アジアにおける地震活动变化の地域特性について、(2)台湾から华南へいたる地域.地震,第2辑,40:593~604.
赵志新,徐纪人,许志琴.2004.上地幔三维S波速度结构与大别苏鲁超高压变质带俯冲折返机制探讨.岩石学报,20(1):145~152.
中央地震工作小组办公室.1971.中国地震目录.北京:科学出版社.
朱光,宋传中,王道轩,等.2001.郯庐断裂带走滑时代的40Ar/39Ar年代学研究及其构造意义.中国科学(D辑),31(3):250~256.
Haker B R,Ratschitecyur L,Webb L,Ireland T,Walker D,DongShuwen.1998.U/Pb zircon ages constrain the architecyure ofthe ultrahigh-pressure Qinling-Dabie Orogen,China.Earth andPlanetary Science Letters,161:215~230.
Ma Lifang.2002.Geological maps of China.Beijing:GeologicalPublishing House(in Chinese).
The Central Earthquake Office of China.1971.Earthquake Catalog ofChina.Beijing:Science Press(in Chinese).
Tong J W,Yan Y F,Wang G J,et al.2006.Structure of Earth'scrust and upper mantle,inland subduction and its coupling effectson Dabie orogenic belt and the Tangcheng-Lujiang fault zone.Chinese J.Geophys.,49(2):449~457(in Chinese with Englishabstract).
Xu Jiren,Oike Kazuo.1995.Earthquake mechanisms and itsimplication for tectonic stress field in the southern part of theNorth-South Seismic Belt in China.Acta Seismologica Sinica,17(1):31~40(in Chinese with English abstract).
Xu Jiren,Zhao Zhixin,Oike Kazuo.2002.Tectonics characteristics ofseismogenic stress field in East Asia.In:Fujinawa Y,Oshida A,eds.Seismotectonics in Convergent Plate Boundary.Tokyo:Terra Scientific Publishing Company,481~497.
Xu Jiren,Yang Wencai,Zhao Zhixin,et al.2003.Three-dimensionalvelocity structure of the Sulu-Dabie orogen belt.Acta GeologicaSinica,77(4):577~582(in Chinese with English abstract).
Xu Zhiqin,Zhang Zeming,Liu Fulai,et al.2003.Exhumationstructure and mechanism of the Sulu ultrahigh pressuremetamorphic belt,central China.Acta Geologica Sinica,77(4):433~450(in Chinese with English abstract).
Xu Zhonghuai.2001.A present-day tectonic stress map for easternAsia region.Acta Seismologica Sinica,23(5):492~501(inChinese with English abstract).
Xue Qifu.2002.Earthquake Cases in China(1997~1999).Beijing:Seismological Publishing House(in Chinese).
Yang Jingsui,Xu Zhiqin,Wu Cailai,et al.2002.SHRIMP U-Pb oncoesite-bearing zircon:Evidence for Indosinian ultrahigh-pressuremetamorphism in Su-Lu,East China.Acta Geologica Sinica,76(3):355~372(in Chinese with English abstract)
Zhang Zhaocheng.1988.Earthquake Cases in China(1966~1975).Beijing:Seismological Publishing House(in Chinese).
Zhao Zhixin,Kazuo Oike,Kazuo Matsumura,Yuzo Ishikawa.1990.Stress field in the continental part of China--Derived fromtemporal variations of seismic activity.Tectonophysics,178:357~372.
Zhu Guang,Song Chuanzhong,Wang Daoxuan,et al.2001.Studyon40Ar/39Ar ages of the strike-slip in the Tanlu Fold.Science inChina(Series D),31(3):250~256(in Chinese).
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