上海奉城--浙江湖州长周期MT剖面揭示的深部电性结构  

Using long period magnetotelluric profile of Fengcheng of Shanghai—Huzhou of Zhejiang province to study deep electrical structure

作　　者：于鹏[1] 吴健生[1] 王家林[1] 张新兵[1] 章振铨[2] 姚保华[2] 

机构地区：[1]同济大学海洋地质国家重点实验室,上海200092 [2]上海市地震局,上海200062

出　　处：《地球物理学报》2008年第2期503-510,共8页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目(40674063);国家高技术研究发展计划(2006AA09Z359)资助

摘　　要：利用GMS-06电磁观测系统对上海奉城—浙江湖州剖面进行了大地电磁数据采集,获得了超过4000s的高质量长周期观测数据,为沪浙地区深部电性结构研究提供了有利条件.通过反演处理,综合倾子解释结果和重磁资料以及最新的地震解释结果,在电性和断裂结构上获得了新的认识,对湖州—苏州、乌镇—马金、枫泾—川沙以及太仓—奉贤这几条深大断裂带的展布以及对区域构造格架的控制作用进行了新的评价,其中枫泾—川沙断裂是上海断隆和湖州—南通台拱之间推覆构造过渡带的控制断裂,太仓—奉贤断裂带的主体位置推断在亭林附近.同时,对高阻基底以上电性层进行了解释,揭示了岩石圈底界面的结构和构造形态,推断湖州—苏州断裂西侧存在壳内高导层.A magnetotelluric sounding （MT） profile from Fengcheng of Shanghai to Huzhou of Zhejiang province was conducted using GMS-06 surveying system, high quality long period data over 4000 s were obtained. By inversion and processing, these MT data provide basis for the studies of deep electrical and fault structures. Integrating with tipper interpretation result, gravity ＆ magnetic data and updated seismic interpretation, new recognitions about the conductivity and fault structures are obtained. The styles of several large and deep faults such as Huzhou--Suzhou, Wuzhen--Majin, Fengjing---Chuansha and Taicang---Fengxian and their roles in controlling the regional tectonics are evaluated. The fault of Fengiing---Chuansha controls the nappe transition structure zone between Shanghai uplift and Huzhou--Nantong arched area. The main distribution position of the fault of Taicang--Fengxian is deduced at the vicinity of Tinglin. Moreover, the electrical strata overlying on the high resistant basement, the crustal high--conductive stratum existing in the west area of Huzhou-Suzhou fault, the bottom interface of lithosphere, are also revealed and interpreted.

关 键 词：大地电磁测深 深部电性结构 深部断裂 壳内高导层 倾子 岩石圈 沪浙地区 

分 类 号：P631[天文地球—地质矿产勘探]