太仓-奉贤断裂基于遥感、重磁数据的结构特征研究
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摘要
利用遥感影像数据研究太仓-奉贤断裂地貌特征,通过小波多尺度方法对布格重力数据进行分解,并应用重力、航磁数据分析其深部结构,结合前人人工地震及沉积演化历史资料进一步探讨该断裂与古海岸线的关系。布格重力异常显示,该断裂形成NW向的重力梯度带,由北向南依次控制白茆断凹、甪直断凹和松江断凹的东部边界;重力小波细节图表明,该断裂切穿中上地壳到达下地壳,在下地壳太仓-奉贤断裂仍与太仓-陈家镇断裂、昆山-嘉定断裂、青浦-龙华断裂、松江-嘉善断裂和南汇-平湖断裂相交;航磁场揭示该断裂两侧的地质体存在明显的磁性差异。综合重力、航磁及前人资料可知,太仓-奉贤断裂是江苏地区一条重要的隐伏构造断裂,切穿底部基岩至下地壳,构成全新世中期古海岸线。
Remote sensing image data were used to study the geomorphic feature of Taicang-Fengxian fracture.Meanwhile,wavelet multi-scale analytical method was applied to decomposing Bouguer gravity data,and the deep structure of Taicang-Fengxian fracture was analyzed based on the gravity,aeromagnetic data. And then the relationship between Taicang-Fengxian fracture and the ancient coastline was further explored on the basis of the previous artificial earthquake and sedimentary evolution history data. The Bouguer gravity anomalies figure shows that Taicang-Fengxian fracture forms NW-trending gravity anomalies gradient zone and controls respectively the eastern boundary of Baimao fault depression,Luzhi fault depression and the Songjiang fault depression from north to south.These gravity wavelet detail figures show that the fracture cuts through the upper and middle crust to the lower crust and still intersects Taicang-Fengxian fault,Taicang-Chenjiazhen fracture,Kunshan-Jiading fault,Qingpu-Longhua fault,Songjiang-Jiashan fault and Nanhui-Pinghu fault at the lower crust. The aeromagnetic field reveals the magnetic differences of geological bodies in both sides of the fracture. According to gravity,aeromagnetic and previous data,Taicang-Fengxian fracture is an important buried structure fracture in Jiangsu area,cuts through the bottom of bedrock to the lower crust and formed the mid-Holocene coast line.
引文
1 顾澎涛,邱金波,许保桐,等.太仓-奉贤北西向活动断裂及其地震地质意义初探.上海地质,1990;90(3):1—6Gu P T,Qiu J B,Xu B T,et al.The NW-active fracture zone of Taicang-fengxian and its seismic geological significance.Shanghai Geology,1990;90(3):1—6
    2 姜文亮,张景发,龚丽霞.海南岛北部地区活动断裂的遥感解译研究.地震地质,2007;29(4):796—804Jiang W L,Zhang J F,Gong L X.Interpretation of multi-sourcers images of active fault in the north of Hainan island.Seismology and Geology,2007;29(4):794—804
    3 张微,陈汉林,李启敏,等.高分辨遥感在杭州活断层探测中的应用.煤田地质与勘探,2007;35(3):10—14Zhang H,Chen H L,Li Q M,et al.The application of high resolution remote sensing in Hangzhou active fault detection.Coal Geology and Exploration,2007;35(3):10—14
    4 姜文亮,张景发.川滇地区重力场与深部结构特征.地球物理学进展,2011;26(6):1915—1924Jiang W L,Zhang J F.Deep structures of Sichuan-Yunnan region derived from gravity data.Progress in Geophysics,2011;26(6):1915—1924
    5 Mallat S.A theory for multi-resolution signal decomposition:the wavelet representation.IEEE Trans,Acoustic Signal Speech Process,1989;37:2091—2110
    6 Jiang Wenliang,Wang Xin,Tian Tian,et al.Detailed crustal structure of the North China and its implication for seismicity.Journal of Asian Earth Sciences,2014;81:53—64
    7 Jiang Wenliang,Zhang Jingfa,Tian Tian,et al.Crustal structure of Chuan-Dian region derived from gravity data and its tectonic implications.Physics of the Earth and Planetary Interiors,2012;212—213:76 —87
    8 姜文亮,张景发,焦孟梅,等.基于布格重力异常小波多尺度分析方法研究首都圈地区构造特征.地质学报,2010;84(4):457 —465Jiang W L,Zhang J F,Jiao M M,et al.The research of tectonic characteristics in the capital area based on bouguer gravity anomaly wavelet multi-scale analysis method.Geological Journal,2010;84(4):457—465
    9 申宁华,李春华,张贵宾,等.用康滇大陆古裂谷带地区航磁异常计算居里深度.地球物理学报,1986;29(5):496—502Shen N H,Li C H,Zhang G B,et al.The calculation of Curie depth using aeromagnetic anomalies in Kangdian ancient rift zone.Chinese Journal of Geophysics,1986;29(5):496—502
    10 路晓翠,张景发,朱鲁,等.利用小波多尺度分解研究郯庐断裂带苏鲁段构造.地球物理学进展,2012;27(1):59—64Lu X C,Zhang J F,Zhu L,et al.The structure research of Tanlu fault zone Sulu section using wavelet multi-scale decomposition.Progress in Geophysics,2012;27(1):59—64
    11 章振铨,刘昌森.上海两条隐伏第四纪断裂的研究.地震地质,2011;23(4):581—587Zhang Z Q,Liu C S.Research on two burled quaternary faults in Shanghai.Seismology and Geology,2011;23(4):581—587

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