苏鲁大别造山带岩石圈三维P波速度结构特征
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摘要
本文全面收集整理并解析了地学断面、地震测深、体波和面波层析成像资料,得到了苏鲁大别造山带及其邻区岩石圈1°×1°三维P波速度数据体。研究结果表明,苏鲁与大别造山带高压、超高压变质带的岩石圈速度结构具有上地壳明显高速且上凸;中地壳增厚;下地壳埋藏较深且下凹等相似的基本特征。苏鲁和大别超高压变质带下的莫霍面比其周围深2～4 km,深度分别达到32～33 km和34～38 km。在大别造山带,有地壳低速体从南向北俯冲到上地幔的迹象,可能显示了扬子地块地壳物质向华北地块俯冲,坠入上地幔的残留体。超高压变质带岩石圈底部的地幔,往往有明显高速层或高速体存在。苏鲁与大别地区的岩石圈速度结构不同特征及其成因在于苏鲁地区上地壳P波速度更高,但是,下地壳下凹没有大别地区明显,而且区域构造较为均一。这可能是受到郯庐断层左行平移的主控影响所致。郯庐断裂带的上、中地壳和上地幔表现为相对低速异常,郯庐断裂及其地下延伸部分将岩石圈地幔浅部低速层和深部高速层切为两段,其影响深达岩石圈底部约90 km处。
A 3-D lithospheric structure of P-wave velocity in the Sulu -Dabie orogen area has been studied based on the results from the Global Geological Transect projects (GGT), wide-angle seismic sounding, teleseismic tomography and other data. The obtained results are shown in plates with the data density of 1°×1°. The lithospheric structures in the ultra-high pressure metamorphic (UHPM) belts in the Sulu and Dabie areas show similar characteristics more or less. Higher P-wave velocity exists in the upper crust and forms a convex high-velocity region. The thicken middle crust is characterized by normal or lower P-wave velocity. The Moho discontinuity is depressed under the UHPM terranes. The Moho discontinuity in the Sulu and Dabie orogen areas are deeper than their surroundings and the depths reach 32~33 km and 34~38 km, respectively. The P-wave velocity of the upper crust in the Sulu UHPM belt is higher than that in the Dabie area. The depressing of the Moho discontinuity beneath the Dabie, however, is obviously deeper than that beneath the Sulu region. It is attributable to the effect of the left-lateral strike-slip movement along the Tanlu fault in the Sulu area.
A 3-D lithospheric structure of P-wave velocity in the Sulu -Dabie orogen area has been studied based on the results from the Global Geological Transect projects (GGT), wide-angle seismic sounding, teleseismic tomography and other data. The obtained results are shown in plates with the data density of 1°×1°. The lithospheric structures in the ultra-high pressure metamorphic (UHPM) belts in the Sulu and Dabie areas show similar characteristics more or less. Higher P-wave velocity exists in the upper crust and forms a convex high-velocity region. The thicken middle crust is characterized by normal or lower P-wave velocity. The Moho discontinuity is depressed under the UHPM terranes. The Moho discontinuity in the Sulu and Dabie orogen areas are deeper than their surroundings and the depths reach 32~33 km and 34~38 km, respectively. The P-wave velocity of the upper crust in the Sulu UHPM belt is higher than that in the Dabie area. The depressing of the Moho discontinuity beneath the Dabie, however, is obviously deeper than that beneath the Sulu region. It is attributable to the effect of the left-lateral strike-slip movement along the Tanlu fault in the Sulu area.
引文
董树文,吴宣志.高锐,等.1998． 大别造山带地壳结构与动力学.地球物理学报,41(3) :349～361．
国家地震局地学断面编委会.1991． 江苏响水至内蒙古满都拉地学断面.北京:地震出版社.
国家地震局地学断面编委会.1992a.青海门源至福建宁德地学断面.北京:地震出版社.
国家地震局地学断面编委会.1992b.湖北随州至内蒙古喀喇沁旗地学断面.北京:地震出版社.
国家地震局地学断面编委会.1992c.上海奉贤至内蒙古阿拉善左旗地学断面.北京:地震出版社.
国家地震局《深部物探成果》编写组.1986． 中国地壳上地幔地球物理探测成果.北京:地震出版社.
高山,金振民,Kern H.金淑燕,许志琴,董树文,杨天南.1997． 大别超高压榴辉岩高温高压下地震波速和密度的初步实验研究-对造山带地壳深部组成和莫霍面性质的启示.科学通报.42(8) :862～865．
刘福田,徐惠芬,刘劲松,等.2003． 大陆深俯冲带的地壳速度结构-东大别造山带深地震宽角反射/折射研究.地球物理学报,46(3) :365～372．
钱辉.2002． 江苏东海大陆钻址区层析成像.中国地质科学院地质研究所博士后论文.
王椿庸.张先康,陈步云,等.1997． 大别造山带的地壳结构研究.中国科学(D辑),27(3) :221～226．
王有学.2002． 苏鲁-大别超高压变质造山带广角测深地壳结构研究.中国地质科学院地质研究所博士学位论文.
徐惠芬,刘福田,王清晨,等.2000． 大别苏鲁碰撞造山带的地震层析成像研究--岩石圈三维构造.地球物理学报.43(3) :377～385．
许志琴,张泽明,刘福来,杨经绥,李海兵.杨天南,邱海峻.李天福,孟繁聪,陈志忠。唐哲民.陈方远.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～.
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．
杨文采,余长青.2001． 根据地球物理资料分析大别-苏鲁超高压变质带演化的运动学与动力学.地球物理学报,44(3) :346～359．
杨文采.2003． 东大别超高压变质带的深部构造.中国科学(D辑),33(2) :183～192．
杨文采,汪集旸.2002． 苏鲁地区地壳岩浆底侵的地球物理判识.地质学报,76(2) :173～179．
朱光,宋传中,王道轩。等.2001． 郯庐断裂带走滑时代的~(40) Ar/~(39) Ar年代学研究及其构造意义.中国科学(D辑),3l(3) :250～256．
David James. 2002． How old roots lose their bounce. Nature, 417(27) : 911．
Dong Shuwen, Wu Xuanzhi, Gao Rui, et al.1998． On the crust velocity levels and dynamics of the Dabieshan orogenic belt. Chinese J. Geophys., 41 (3) :349～361 (in Chinese with English abstract).
Editorial Committee of Global Geoscience Transect, China Seismology Bureau. 1991． The geoscience transect from the Xiangshui, Jiangsu Province to the Mandula, Inner Mongolia. Beijing: Seismological Press (in Chinese).
Editorial Committee of Global Geoscience Transect, China Seismology Bureau. 1992a. The geoscience transect from the Menyuan, Qinghai Province to the Ningde, Fujian Province. Beijing: Seismological Press (in Chinese).
Editorial Committee of Global Geoscience Transect, China Seismology Bureau. 1992b. The geoscience transect from the Shuizhou, Hubei Province to the Karaqing-qi, Inner Mongolia. Beijing: Seismological Press (in Chinese).
Editorial Committee of Global Geoscienee Transect, China Seismology Bureau. 1992c. The geoseienee transect from the Fengxian, Shanghai to the Arashanzuo-qi, Inner Mongolia. Beijing: Seismological Press (in Chinese).
Editorial Committee of Results on Deep Geophysical Survey, China Seismology Bureau. 1986． Geophysical survey of crust and upper mantle in China. Beijing: Seismological Press (in Chinese).
Gao Shan, Jin Zhenmin, Kern H,et al. 1997． Experimental study on seismic velocity and density of the eclogites in the Dabie UHPM belt at High P-T conditions--Inspiration for the formation of deep crust and the property of Moho surface in orogen belts. Chinese Science Bulletin, 42(8) :862～865 (in Chinese). Haker B R, Ratschitecyur L,Webb L, Ireland T, Walker D, Dong Shuwen. 1998． U/Pb zircon ages constrain the architecyure of the ultrahigh-pressure Qinling-Dabie orogen, China. Earth and Planetary Science Letters, 161: 215～230．
Liu Futian, Xu Heifen, Liu Jinsong, et al. 2003． The crustal velocity structure of the continental deep subduction belt: Study on the eastern Dabie orogen by seismic wide-angle reflection/refraction. Chinese J. Geophys., 46(3) : 365～372． (in Chinese with English abstract).
Qian Hui. 2002． Tomography study on the drilling area of the Chinese Continental Scientific Drilling Project in the Donghai, Jiangsu Province.Institute of Geology, Chinese Academy Geological Sciences, Post doctoral thesis.
Wang Chunhang, Zhang Xiankang, Chert Buyun, et al. 1997． Study on the crust structures of the Dabie orogen belts. Science in China (Series D), 27(3) : 221～226．
Wang Youxue. 2002． Study on the crustal velocity structure of the Dabie-Sulu UHPM belt by seismic wide-angle sounding. Institute of Geology, Chinese Academy Geological Sciences, Ph.D. thesis.
Xu Huifen, Liu Futian, Wang Qingchun, et al. 2000． Seismic tomography beneath the Dabie Sulu collision orogen--3D velocity structure of lithosphere. Chinese J. Geophys., 43(3) : 377～385 (in Chinese with English abstract).
Xu Jiren, Zhao Zhixin, Oike Kazuo. 2002． Tectonic characteristics of seismogenic stress field in East Asia. In: Fujinawa Y, Yoshida A, eds. Seismotectonics in Covergent Plate Boundary. Tokyo: TERRAPUB, 481～497．
Xu Zhiqin, Yang Wencai, Cong Bolin, et al. 1998． Drilling operations in the Dabie-Sulu UHPM belt, East China. A Proposal to ICDP.
Xu Zhiqin, Zhang Zeroing, Liu Fulai. et al. 2003． Exhumation structure and mechanism of the Sulu ultrahigh pressure metamorphic belt, Central China. Acta Geologica Sinica, 77(4) : 433～? (in Chinese with English abstract).
Yang Jingsui, Xu Zhiqin, Wu Cailai, et al. 2002． SHRIMP U-Pb on coesite-bearing zircon: Evidence for Indosinian ultrahigh-pressure metamorphism in Su-Lu, East China. Acta Geologica Sinica, 76 (3) :355～372 (in Chinese with English abstract).
Yang Wencai, Yu Changqing. 2001． Kinetic and dynamics of development of the Dabie-Sulu UHPM terranes based on geophysical evidences. Chinese J. Geophys., 44 (3) :346～359(in Chinese with English abstract).
Yang Wencai. 2002． Geophysical profiling across Sulu ultra-high-pressure metamorphic belt, Eastern China. Tectonophysics, 354:277～288．
Yang Wencai. 2003． Deep Structure of the ultra high pressure metamorphic belt, the Eastern Dabie Orogen, Eastern China. Science in China (Series D), 33(3) : 183～192．
Yang Wencai, Wang Jiyang. 2002． Geophysical evidence for crustal magma underplating in Sulu area of east China. Acta Geologica Sinica, 76(2) :173～179．
Zhu Guang, Song Chuanzhong, Wang Daoxuan, et al. 2001． Study on ~(40) Ar/~(39) Ar ages of the strike-slip in the Tanlu fold. Science in China (Series D),31(3) : 250～256．
国家地震局地学断面编委会.1991． 江苏响水至内蒙古满都拉地学断面.北京:地震出版社.
国家地震局地学断面编委会.1992a.青海门源至福建宁德地学断面.北京:地震出版社.
国家地震局地学断面编委会.1992b.湖北随州至内蒙古喀喇沁旗地学断面.北京:地震出版社.
国家地震局地学断面编委会.1992c.上海奉贤至内蒙古阿拉善左旗地学断面.北京:地震出版社.
国家地震局《深部物探成果》编写组.1986． 中国地壳上地幔地球物理探测成果.北京:地震出版社.
高山,金振民,Kern H.金淑燕,许志琴,董树文,杨天南.1997． 大别超高压榴辉岩高温高压下地震波速和密度的初步实验研究-对造山带地壳深部组成和莫霍面性质的启示.科学通报.42(8) :862～865．
刘福田,徐惠芬,刘劲松,等.2003． 大陆深俯冲带的地壳速度结构-东大别造山带深地震宽角反射/折射研究.地球物理学报,46(3) :365～372．
钱辉.2002． 江苏东海大陆钻址区层析成像.中国地质科学院地质研究所博士后论文.
王椿庸.张先康,陈步云,等.1997． 大别造山带的地壳结构研究.中国科学(D辑),27(3) :221～226．
王有学.2002． 苏鲁-大别超高压变质造山带广角测深地壳结构研究.中国地质科学院地质研究所博士学位论文.
徐惠芬,刘福田,王清晨,等.2000． 大别苏鲁碰撞造山带的地震层析成像研究--岩石圈三维构造.地球物理学报.43(3) :377～385．
许志琴,张泽明,刘福来,杨经绥,李海兵.杨天南,邱海峻.李天福,孟繁聪,陈志忠。唐哲民.陈方远.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～.
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．
杨文采,余长青.2001． 根据地球物理资料分析大别-苏鲁超高压变质带演化的运动学与动力学.地球物理学报,44(3) :346～359．
杨文采.2003． 东大别超高压变质带的深部构造.中国科学(D辑),33(2) :183～192．
杨文采,汪集旸.2002． 苏鲁地区地壳岩浆底侵的地球物理判识.地质学报,76(2) :173～179．
朱光,宋传中,王道轩。等.2001． 郯庐断裂带走滑时代的~(40) Ar/~(39) Ar年代学研究及其构造意义.中国科学(D辑),3l(3) :250～256．
David James. 2002． How old roots lose their bounce. Nature, 417(27) : 911．
Dong Shuwen, Wu Xuanzhi, Gao Rui, et al.1998． On the crust velocity levels and dynamics of the Dabieshan orogenic belt. Chinese J. Geophys., 41 (3) :349～361 (in Chinese with English abstract).
Editorial Committee of Global Geoscience Transect, China Seismology Bureau. 1991． The geoscience transect from the Xiangshui, Jiangsu Province to the Mandula, Inner Mongolia. Beijing: Seismological Press (in Chinese).
Editorial Committee of Global Geoscience Transect, China Seismology Bureau. 1992a. The geoscience transect from the Menyuan, Qinghai Province to the Ningde, Fujian Province. Beijing: Seismological Press (in Chinese).
Editorial Committee of Global Geoscience Transect, China Seismology Bureau. 1992b. The geoscience transect from the Shuizhou, Hubei Province to the Karaqing-qi, Inner Mongolia. Beijing: Seismological Press (in Chinese).
Editorial Committee of Global Geoscienee Transect, China Seismology Bureau. 1992c. The geoseienee transect from the Fengxian, Shanghai to the Arashanzuo-qi, Inner Mongolia. Beijing: Seismological Press (in Chinese).
Editorial Committee of Results on Deep Geophysical Survey, China Seismology Bureau. 1986． Geophysical survey of crust and upper mantle in China. Beijing: Seismological Press (in Chinese).
Gao Shan, Jin Zhenmin, Kern H,et al. 1997． Experimental study on seismic velocity and density of the eclogites in the Dabie UHPM belt at High P-T conditions--Inspiration for the formation of deep crust and the property of Moho surface in orogen belts. Chinese Science Bulletin, 42(8) :862～865 (in Chinese). Haker B R, Ratschitecyur L,Webb L, Ireland T, Walker D, Dong Shuwen. 1998． U/Pb zircon ages constrain the architecyure of the ultrahigh-pressure Qinling-Dabie orogen, China. Earth and Planetary Science Letters, 161: 215～230．
Liu Futian, Xu Heifen, Liu Jinsong, et al. 2003． The crustal velocity structure of the continental deep subduction belt: Study on the eastern Dabie orogen by seismic wide-angle reflection/refraction. Chinese J. Geophys., 46(3) : 365～372． (in Chinese with English abstract).
Qian Hui. 2002． Tomography study on the drilling area of the Chinese Continental Scientific Drilling Project in the Donghai, Jiangsu Province.Institute of Geology, Chinese Academy Geological Sciences, Post doctoral thesis.
Wang Chunhang, Zhang Xiankang, Chert Buyun, et al. 1997． Study on the crust structures of the Dabie orogen belts. Science in China (Series D), 27(3) : 221～226．
Wang Youxue. 2002． Study on the crustal velocity structure of the Dabie-Sulu UHPM belt by seismic wide-angle sounding. Institute of Geology, Chinese Academy Geological Sciences, Ph.D. thesis.
Xu Huifen, Liu Futian, Wang Qingchun, et al. 2000． Seismic tomography beneath the Dabie Sulu collision orogen--3D velocity structure of lithosphere. Chinese J. Geophys., 43(3) : 377～385 (in Chinese with English abstract).
Xu Jiren, Zhao Zhixin, Oike Kazuo. 2002． Tectonic characteristics of seismogenic stress field in East Asia. In: Fujinawa Y, Yoshida A, eds. Seismotectonics in Covergent Plate Boundary. Tokyo: TERRAPUB, 481～497．
Xu Zhiqin, Yang Wencai, Cong Bolin, et al. 1998． Drilling operations in the Dabie-Sulu UHPM belt, East China. A Proposal to ICDP.
Xu Zhiqin, Zhang Zeroing, Liu Fulai. et al. 2003． Exhumation structure and mechanism of the Sulu ultrahigh pressure metamorphic belt, Central China. Acta Geologica Sinica, 77(4) : 433～? (in Chinese with English abstract).
Yang Jingsui, Xu Zhiqin, Wu Cailai, et al. 2002． SHRIMP U-Pb on coesite-bearing zircon: Evidence for Indosinian ultrahigh-pressure metamorphism in Su-Lu, East China. Acta Geologica Sinica, 76 (3) :355～372 (in Chinese with English abstract).
Yang Wencai, Yu Changqing. 2001． Kinetic and dynamics of development of the Dabie-Sulu UHPM terranes based on geophysical evidences. Chinese J. Geophys., 44 (3) :346～359(in Chinese with English abstract).
Yang Wencai. 2002． Geophysical profiling across Sulu ultra-high-pressure metamorphic belt, Eastern China. Tectonophysics, 354:277～288．
Yang Wencai. 2003． Deep Structure of the ultra high pressure metamorphic belt, the Eastern Dabie Orogen, Eastern China. Science in China (Series D), 33(3) : 183～192．
Yang Wencai, Wang Jiyang. 2002． Geophysical evidence for crustal magma underplating in Sulu area of east China. Acta Geologica Sinica, 76(2) :173～179．
Zhu Guang, Song Chuanzhong, Wang Daoxuan, et al. 2001． Study on ~(40) Ar/~(39) Ar ages of the strike-slip in the Tanlu fold. Science in China (Series D),31(3) : 250～256．
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