华南地壳及壳幔过渡带泊松比及其地质意义
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摘要
地震波泊松比蕴涵着丰富的地质信息,根据泊松比可以识别地壳岩石的基性程度,进而分析地球动力学与成矿背景。本文搜集整理了国家地震科学数据共享中心等数据平台自20世纪80年代至2017年底的天然地震震相资料,经过数据筛选,得到华南研究区内M≥2.0级地震事件11410个。通过最小二乘法拟合数据的走时-震中距关系直线方程,得到Pg波平均波速6.11 km/s, Sg波平均波速3.60 km/s,首波Pn波平均波速8.06 km/s, Sn波平均波速4.59 km/s。在此基础上,求得华南地壳平均波速比Vp/Vs为1.697,由公式计算得到华南地壳的平均泊松比为0.234,壳幔界面附近的平均波速比Vp/Vs为1.756,计算得到壳幔界面附近的平均泊松比为0.260。走时反演给出的泊松比结果显示扬子地块、华夏地块以及东南沿海地壳的物性差异。华夏地块与扬子地块之间存在大面积的低泊松比异常区,与江南造山带存在良好的对应关系;而东南沿海、钦杭成矿带泊松比明显较高,解释为幔源物质注入地壳的结果。
Poisson's ratio contains rich geological information, the degree of basic lithology of crustal rock can be identified from the Poisson's ratio, and thus it could be used to analyze geodynamics and metallogenic background. The seismic phase data of local natural earthquakes ranging from the 1980 s to the end of 2017 were collected from the data sharing platform such as China Earthquake Data Center in this study. Furthermore, 11410 earthquakes(M≥2.0) in South China were obtained through screening procedure. According to the linear equations of travel time-epicenter distance relation fitted by least square method, the average velocity of Pg-wave, Sg-wave, Pn-wave and Sn-wave were 6.11 km/s, 3.60 km/s, 8.06 km/s, and 4.59 km/s, respectively. The average velocity ratio(Vp/Vs) of the crust of South China was calculated to be 1.697 and its Poisson's ratio was 0.234; In addition,the calculated average velocity ratio near the crust-mantle boundary of South China was 1.756 and its Poisson's ratio was 0.260.The results of Poisson's ratio using the travel-time tomography method show the petrologic differences among the Yangtze block,Cathaysia Block, and Southeastern coast crust. The large low Poisson's ratio area between the Yangtze block and Cathaysia Block is well correlated with the Jiangnan orogeny belt, and the relatively high Poisson's ratio correlated with Qinhang metallogenic belt and Southeast coast are interpreted as underplating of the mantle derived magma.
Poisson's ratio contains rich geological information, the degree of basic lithology of crustal rock can be identified from the Poisson's ratio, and thus it could be used to analyze geodynamics and metallogenic background. The seismic phase data of local natural earthquakes ranging from the 1980 s to the end of 2017 were collected from the data sharing platform such as China Earthquake Data Center in this study. Furthermore, 11410 earthquakes(M≥2.0) in South China were obtained through screening procedure. According to the linear equations of travel time-epicenter distance relation fitted by least square method, the average velocity of Pg-wave, Sg-wave, Pn-wave and Sn-wave were 6.11 km/s, 3.60 km/s, 8.06 km/s, and 4.59 km/s, respectively. The average velocity ratio(Vp/Vs) of the crust of South China was calculated to be 1.697 and its Poisson's ratio was 0.234; In addition,the calculated average velocity ratio near the crust-mantle boundary of South China was 1.756 and its Poisson's ratio was 0.260.The results of Poisson's ratio using the travel-time tomography method show the petrologic differences among the Yangtze block,Cathaysia Block, and Southeastern coast crust. The large low Poisson's ratio area between the Yangtze block and Cathaysia Block is well correlated with the Jiangnan orogeny belt, and the relatively high Poisson's ratio correlated with Qinhang metallogenic belt and Southeast coast are interpreted as underplating of the mantle derived magma.
引文
Chang Yinfo,Zhou Taofa,Fan Yu.2017.Review of exploration and geological research progress in the Middle-Lower Yangtze River Valley Metallogenic Belt[J].Acta Petrologica Sinica,33(11):3333-3352(in Chinese with English abstract).
Christensen N I,Mooney W D.1995.Seismic velocity structure and composition of the continental crust:A global view[J].J.Geophys.Res.,100:9761-9788.
Deng Qidong,Zhang Peizhen,Ran Yongkang,Yang Xiaoping,Min Wei,Chen Lichun.2003.Active tectonics and earthquake activities in China[J].Earth Science Frontiers,10:66-73(in Chinese with English abstract).
He Chuansong,Santosh M,Dong Shuwen.2015.Continental dynamics of Eastern China:Insights from tectonic history and receiver function analysis[J].Earth-Science Reviews,145:9-24.
He Chuansong,Santosh M.2016.Crustal evolution and metallogeny in relation to mantle dynamics:A perspective from P-wave tomography of the South China Block[J].Lithos,263:3-14.
Huang Haibo,GuoXingwei,Xia Shaohong,Qiu Xuelin.2014.Crustal thickness and Poisson’s ratio in the coastal areas of South China[J].Chinese J.Geophys,57(12):3896-3906(in Chinese with English abstract).
Huang Yun,Li Qinghe,Zhang Yuansheng,Sun Yejun,Shen Honghui,Jin Shumei.2008.Relocation of earthquakes in Jiangsu and neighboring areas,China and analysis of structural features[J].Chinese J.Geophys,51(1):175-185(in Chinese with English abstract).
Huang Qixun.2000.The characteristics of some important basic geology in Guangxi[J].Guangxi Geology,13(3):3-12(in Chinese with English abstract).
Ji Shaochen,Wang Qian,Xia Bin.2002.Handbook of Seismic Properties of Minerals,Rocks and Ores[M].Montreal:Polytechnic International Press,630.
Ji Shaochen,Wang Qian,Sun Shengsi.2009a.Seismic properties of crystalline rocks and geological and geophysical implications[J].Chinese Journal of Geology,44(4):1113-1135(in Chinese with English abstract).
Ji Shaochen,Wang Qian,Yang Wencai.2009b.Correlation between crustal thickness and Poisson’s ratio in the North China craton and its implication for lithospheric thinning[J].Acta Geologica Sinica,83(3):324-330(in Chinese with English abstract).
Li Hongxing,Zhao Fengfan,Mao Yong.2015.Three dimensional velocity structure seismic tomography of up-crust in Jiangxi province[J].Progress in Geophysics,30(3):1049-1055(in Chinese with English abstract).
Li Jianhua,Dong Shuwen,PeterA.Cawood,Zhao Guochun,Stephen T.Johnston,Zhang Yueqiao,Xin Yujia.2018.An Andean-type retro-arc foreland system beneath northwest South China revealed by SINOPROBE profiling[J].Earth and Planetary Science Letters,490:170-179.
Lin Shoufa,Xing Guangfu,Donald W.davis,Yin Changqing,Wu Meiling,Li Longming,Jiang Yang,Chen Zhihong.2018.Appalachian-style multi-terrane Wilson cycle model for the assembly of South China[J].Geology,46(4):319-322.
Liu Bin,Xi Daoying,Ge Ningjie,Wang Baoshan,Kern H,Popp T.2002.Anisotropy of Poisson’s ratio in rock samples under confining pressures[J].Chinese J.Geophys,45(6):880-890(in Chinese with English abstract).
Mao Jingwen,Xie Guiqing,Yuan Shunda,Liu Peng,Meng Xuyang,Zhou Zhenhua,Zheng Wei.2018.Current research progress and future trends of porphyry-skarn copper and granite-related tin polymetallic deposits in the Circum Pacific metallogenicbelts[J].Acta Petrologica Sinica,34(9):2501-2517.
Wang Xiaolei,Zhou Jincheng,Wan Yusheng,Kitajima K,Wang Di,Bonamici C,Qiu Jiansheng,Sun Tao.2013.Magmatic evolution and crustal recycling for Neoproterozoic strongly peraluminous granitoids from southern China:Hf and O isotopes in zircon[J].Earth and Planetary Science Letters,366:71-82.
Pei Rongfu,Wang Yonglei,Li li,Wang Haolin.2008.South China great granite province and its metallogenic series of Tungsten-Tin poly-metallics[J].China Tungsten Industry,23(1):10-13(in Chinese with English abstract).
Shu Liangshu.2012.An analysis of principal features of tectonic evolution in South China Block[J].Geological Bulletin of China,31(7):1035-1053(in Chinese with English abstract).
Thurber C H,Atre S R.1993.Three-dimensional Vp/Vs variations along the Loma Prieta rupture zone[J].Bull.Seism.Soc.Am.,83:717-736.
Xu Tao,Zhang Zhongjie,TianXiaobo,Liu Baofeng,Bai Zhiming,LüQingtian,Teng Jiwen.2014.Crustal structure beneath the MiddleLower Yangtze metallogenic belt and its surrounding areas:Constraints from active source seismic experiment along the Lixin to Yixing profile in East China[J].Acta Petrologica Sinica,30(4):918-930(in Chinese with English abstract).
Yang Minggui,Huang Shuibao,Lou Fasheng,Tang Weixin,Mao Subin.2009.Lithospheric structure and large-scale metallogenic process in Southeast China continental area[J].Geology in China,36(3):528-543(in Chinese with English abstract).
Yang Wencai,Qu Chen,Yu Changqing.2011.High Poisson’s ratio anomalies in the crust of the eastern part of North China and its origin[J].Earth Science Frontiers,2011,18(3):13-21(in Chinese with English abstract).
Zhang Guowei,GuoAnlin,Wang Yuejun,Li Sanzhong,Dong Yunpeng,Liu Shaofeng,He Dengfeng,Cheng Shunyou,Lu Rukui,Yao Anping.2013.Tectonics of South China continent and its implications[J].Science China:Earth Sciences,43(10):1553-1582(in Chinese with English abstract).
Zhang Haijiang,Thurber C H.2003.Double-difference tomography:the method and its application to the Hayward fault,California[J].Bulletin of the Seismological Society of America,93(5):1875-1889.
Zhang Yaoyang,Chen Lin,Ai Yinshuang,Jiang Mingming,Xu Weiwei,Shen Zhongyin.2018.Lithospheric structure of the South China Block from S-receiver function[J].Chinese J.Geophys61(1):138-149(in Chinese with English abstract).
Zhou Yongzhang,Li Xingyuan,Zheng Yi,Shen Wenjie,He Junguo,Yu Pengpeng,NiuJia,Zeng Changyu.2017.Geological settings and metallogenesis of Qinzhou Bay-Hangzhou Bay orogenic juncture belt,South China[J].Acta Petrologica Sinica,33(3):667-681(in Chinese with English abstract).
常印佛,周涛发,范裕.2017.长江中下游成矿带矿产勘查-科研工作回顾和展望[J].岩石学报,33(11):3333-3352.
邓起东,张培震,冉永康,杨晓平,闵伟,陈立春.2003.中国活动构造与地震活动[J].地学前缘,10:66-73.
黄海波,郭兴伟,夏少红,丘学林.2014.华南沿海地区地壳厚度与泊松比研究[J].地球物理学报,57(12):3896-3906.
黄耘,李清河,张元生,孙业君,沈红会,金淑梅.2008.江苏及邻区地震重新定位和构造特征分析[J].地球物理学报,51(1):175-185.
黄启勋.2000.广西若干重大基础地质特征[J].广西地质,13(3):3-12.
嵇少丞,王茜,孙圣思.2009a.晶质岩石的地震波性质及其地质、地壳物理意义[J].地质科学,44(4):1113-1135.
嵇少丞,王茜,杨文采.2009b.华北克拉通泊松比与地壳厚度的关系及其大地构造意义[J].地质学报,83(3):324-330.
李红星,赵烽帆,毛勇.2015.江西上地壳三维速度结构地震层析成像[J].地球物理学进展,30(3):1049-1055.
刘斌,席道瑛,葛宁洁,王宝善,Kern H,Popp T.2002.不同围压下岩石中泊松比的各向异性[J].地球物理学报,45(6):880-890.
毛景文,谢桂青,袁顺达,刘鹏,孟旭阳,周振华,郑伟.2018.环太平洋成矿带斑岩-矽卡岩型铜矿和花岗岩有关的锡多金属矿研究现状与展望[J].岩石学报,34(9):2501-2517.
舒良树.2012.华南构造演化的基本特征[J].地质通报,31(7):1035-1053.
王孝磊,周金城,陈昕,张凤凤,孙梓铭.2017.江南造山带的形成与演化[J].矿物岩石地球化学通报,36(5):714-735.
徐涛,张忠杰,田小波,刘宝峰,白志明,吕庆田,滕吉文.2014.长江中下游成矿带及邻区地壳速度结构：来自利辛-宜兴宽角地震资料的约束[J].岩石学报,30(4):918-930.
杨明桂,黄水保,楼法生,唐维新,毛素斌.2009.中国东南陆区岩石圈结构与大规模成矿作用[J].中国地质,36(3):528-543.
杨文采,瞿辰,于常青.2011.华北东部地区地壳泊松比异常及其成因[J].地学前缘,18(3):13-21.
张国伟,郭安林,王岳军,李三忠,董云鹏,刘少峰,何登发,程顺有,鲁如魁,姚安平.2013.中国华南大陆构造与问题[J].中国科学:地球科学,43(10):1553-1582.
张耀阳,陈凌,艾印双,姜明明,许卫卫,申中寅.2018.利用S波接收函数研究华南块体的岩石圈结构[J].地球物理学报,61(1):138-149.
周永章,李兴远,郑义,沈文杰,何俊国,虞鹏鹏,牛佳,曾长育.2017.钦杭结合带成矿地质背景及成矿规律[J].岩石学报,33(3):667-681.
?中国地质科学院.2018.钦杭结合带及邻区深部地质调查成果报告[R].
Christensen N I,Mooney W D.1995.Seismic velocity structure and composition of the continental crust:A global view[J].J.Geophys.Res.,100:9761-9788.
Deng Qidong,Zhang Peizhen,Ran Yongkang,Yang Xiaoping,Min Wei,Chen Lichun.2003.Active tectonics and earthquake activities in China[J].Earth Science Frontiers,10:66-73(in Chinese with English abstract).
He Chuansong,Santosh M,Dong Shuwen.2015.Continental dynamics of Eastern China:Insights from tectonic history and receiver function analysis[J].Earth-Science Reviews,145:9-24.
He Chuansong,Santosh M.2016.Crustal evolution and metallogeny in relation to mantle dynamics:A perspective from P-wave tomography of the South China Block[J].Lithos,263:3-14.
Huang Haibo,GuoXingwei,Xia Shaohong,Qiu Xuelin.2014.Crustal thickness and Poisson’s ratio in the coastal areas of South China[J].Chinese J.Geophys,57(12):3896-3906(in Chinese with English abstract).
Huang Yun,Li Qinghe,Zhang Yuansheng,Sun Yejun,Shen Honghui,Jin Shumei.2008.Relocation of earthquakes in Jiangsu and neighboring areas,China and analysis of structural features[J].Chinese J.Geophys,51(1):175-185(in Chinese with English abstract).
Huang Qixun.2000.The characteristics of some important basic geology in Guangxi[J].Guangxi Geology,13(3):3-12(in Chinese with English abstract).
Ji Shaochen,Wang Qian,Xia Bin.2002.Handbook of Seismic Properties of Minerals,Rocks and Ores[M].Montreal:Polytechnic International Press,630.
Ji Shaochen,Wang Qian,Sun Shengsi.2009a.Seismic properties of crystalline rocks and geological and geophysical implications[J].Chinese Journal of Geology,44(4):1113-1135(in Chinese with English abstract).
Ji Shaochen,Wang Qian,Yang Wencai.2009b.Correlation between crustal thickness and Poisson’s ratio in the North China craton and its implication for lithospheric thinning[J].Acta Geologica Sinica,83(3):324-330(in Chinese with English abstract).
Li Hongxing,Zhao Fengfan,Mao Yong.2015.Three dimensional velocity structure seismic tomography of up-crust in Jiangxi province[J].Progress in Geophysics,30(3):1049-1055(in Chinese with English abstract).
Li Jianhua,Dong Shuwen,PeterA.Cawood,Zhao Guochun,Stephen T.Johnston,Zhang Yueqiao,Xin Yujia.2018.An Andean-type retro-arc foreland system beneath northwest South China revealed by SINOPROBE profiling[J].Earth and Planetary Science Letters,490:170-179.
Lin Shoufa,Xing Guangfu,Donald W.davis,Yin Changqing,Wu Meiling,Li Longming,Jiang Yang,Chen Zhihong.2018.Appalachian-style multi-terrane Wilson cycle model for the assembly of South China[J].Geology,46(4):319-322.
Liu Bin,Xi Daoying,Ge Ningjie,Wang Baoshan,Kern H,Popp T.2002.Anisotropy of Poisson’s ratio in rock samples under confining pressures[J].Chinese J.Geophys,45(6):880-890(in Chinese with English abstract).
Mao Jingwen,Xie Guiqing,Yuan Shunda,Liu Peng,Meng Xuyang,Zhou Zhenhua,Zheng Wei.2018.Current research progress and future trends of porphyry-skarn copper and granite-related tin polymetallic deposits in the Circum Pacific metallogenicbelts[J].Acta Petrologica Sinica,34(9):2501-2517.
Wang Xiaolei,Zhou Jincheng,Wan Yusheng,Kitajima K,Wang Di,Bonamici C,Qiu Jiansheng,Sun Tao.2013.Magmatic evolution and crustal recycling for Neoproterozoic strongly peraluminous granitoids from southern China:Hf and O isotopes in zircon[J].Earth and Planetary Science Letters,366:71-82.
Pei Rongfu,Wang Yonglei,Li li,Wang Haolin.2008.South China great granite province and its metallogenic series of Tungsten-Tin poly-metallics[J].China Tungsten Industry,23(1):10-13(in Chinese with English abstract).
Shu Liangshu.2012.An analysis of principal features of tectonic evolution in South China Block[J].Geological Bulletin of China,31(7):1035-1053(in Chinese with English abstract).
Thurber C H,Atre S R.1993.Three-dimensional Vp/Vs variations along the Loma Prieta rupture zone[J].Bull.Seism.Soc.Am.,83:717-736.
Xu Tao,Zhang Zhongjie,TianXiaobo,Liu Baofeng,Bai Zhiming,LüQingtian,Teng Jiwen.2014.Crustal structure beneath the MiddleLower Yangtze metallogenic belt and its surrounding areas:Constraints from active source seismic experiment along the Lixin to Yixing profile in East China[J].Acta Petrologica Sinica,30(4):918-930(in Chinese with English abstract).
Yang Minggui,Huang Shuibao,Lou Fasheng,Tang Weixin,Mao Subin.2009.Lithospheric structure and large-scale metallogenic process in Southeast China continental area[J].Geology in China,36(3):528-543(in Chinese with English abstract).
Yang Wencai,Qu Chen,Yu Changqing.2011.High Poisson’s ratio anomalies in the crust of the eastern part of North China and its origin[J].Earth Science Frontiers,2011,18(3):13-21(in Chinese with English abstract).
Zhang Guowei,GuoAnlin,Wang Yuejun,Li Sanzhong,Dong Yunpeng,Liu Shaofeng,He Dengfeng,Cheng Shunyou,Lu Rukui,Yao Anping.2013.Tectonics of South China continent and its implications[J].Science China:Earth Sciences,43(10):1553-1582(in Chinese with English abstract).
Zhang Haijiang,Thurber C H.2003.Double-difference tomography:the method and its application to the Hayward fault,California[J].Bulletin of the Seismological Society of America,93(5):1875-1889.
Zhang Yaoyang,Chen Lin,Ai Yinshuang,Jiang Mingming,Xu Weiwei,Shen Zhongyin.2018.Lithospheric structure of the South China Block from S-receiver function[J].Chinese J.Geophys61(1):138-149(in Chinese with English abstract).
Zhou Yongzhang,Li Xingyuan,Zheng Yi,Shen Wenjie,He Junguo,Yu Pengpeng,NiuJia,Zeng Changyu.2017.Geological settings and metallogenesis of Qinzhou Bay-Hangzhou Bay orogenic juncture belt,South China[J].Acta Petrologica Sinica,33(3):667-681(in Chinese with English abstract).
常印佛,周涛发,范裕.2017.长江中下游成矿带矿产勘查-科研工作回顾和展望[J].岩石学报,33(11):3333-3352.
邓起东,张培震,冉永康,杨晓平,闵伟,陈立春.2003.中国活动构造与地震活动[J].地学前缘,10:66-73.
黄海波,郭兴伟,夏少红,丘学林.2014.华南沿海地区地壳厚度与泊松比研究[J].地球物理学报,57(12):3896-3906.
黄耘,李清河,张元生,孙业君,沈红会,金淑梅.2008.江苏及邻区地震重新定位和构造特征分析[J].地球物理学报,51(1):175-185.
黄启勋.2000.广西若干重大基础地质特征[J].广西地质,13(3):3-12.
嵇少丞,王茜,孙圣思.2009a.晶质岩石的地震波性质及其地质、地壳物理意义[J].地质科学,44(4):1113-1135.
嵇少丞,王茜,杨文采.2009b.华北克拉通泊松比与地壳厚度的关系及其大地构造意义[J].地质学报,83(3):324-330.
李红星,赵烽帆,毛勇.2015.江西上地壳三维速度结构地震层析成像[J].地球物理学进展,30(3):1049-1055.
刘斌,席道瑛,葛宁洁,王宝善,Kern H,Popp T.2002.不同围压下岩石中泊松比的各向异性[J].地球物理学报,45(6):880-890.
毛景文,谢桂青,袁顺达,刘鹏,孟旭阳,周振华,郑伟.2018.环太平洋成矿带斑岩-矽卡岩型铜矿和花岗岩有关的锡多金属矿研究现状与展望[J].岩石学报,34(9):2501-2517.
舒良树.2012.华南构造演化的基本特征[J].地质通报,31(7):1035-1053.
王孝磊,周金城,陈昕,张凤凤,孙梓铭.2017.江南造山带的形成与演化[J].矿物岩石地球化学通报,36(5):714-735.
徐涛,张忠杰,田小波,刘宝峰,白志明,吕庆田,滕吉文.2014.长江中下游成矿带及邻区地壳速度结构：来自利辛-宜兴宽角地震资料的约束[J].岩石学报,30(4):918-930.
杨明桂,黄水保,楼法生,唐维新,毛素斌.2009.中国东南陆区岩石圈结构与大规模成矿作用[J].中国地质,36(3):528-543.
杨文采,瞿辰,于常青.2011.华北东部地区地壳泊松比异常及其成因[J].地学前缘,18(3):13-21.
张国伟,郭安林,王岳军,李三忠,董云鹏,刘少峰,何登发,程顺有,鲁如魁,姚安平.2013.中国华南大陆构造与问题[J].中国科学:地球科学,43(10):1553-1582.
张耀阳,陈凌,艾印双,姜明明,许卫卫,申中寅.2018.利用S波接收函数研究华南块体的岩石圈结构[J].地球物理学报,61(1):138-149.
周永章,李兴远,郑义,沈文杰,何俊国,虞鹏鹏,牛佳,曾长育.2017.钦杭结合带成矿地质背景及成矿规律[J].岩石学报,33(3):667-681.
?中国地质科学院.2018.钦杭结合带及邻区深部地质调查成果报告[R].
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