| 天津断裂第四纪活动性研究 |
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| 引用本文： | 邵永新,李振海,陈宇坤,任峰,姚政权.天津断裂第四纪活动性研究[J].地震地质,2010,32(1):80. |
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| 作者姓名： | 邵永新 李振海 陈宇坤 任峰 姚政权 |
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| 作者单位： | 1. 天津市地震局,天津,300201
2. 中国科学院地球环境研究所,黄土与第四纪地质国家重点实验室,西安,710075 |
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| 基金项目： | 国家发展和改革委员会发改投资 |
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| 摘 要： | 天津断裂分为天津南断裂和天津北断裂。根据人工地震探测结果,分别在天津静海县城西、西青区炒米店村、小南河村以及宁河县朱头淀村布设了4条钻孔剖面,对这2条断裂开展了钻孔勘探工作。经微体古生物鉴定,获得了各钻孔的海相层位置;经地层年代测试,确定了第1、第2和第3海相层的年代;通过以海相层为标志层的地层对比,并结合小南河村BZ1、TN3孔古地磁的测试结果,对这2条断裂的活动性进行了分析研究。结果表明,天津南断裂晚更新世以来未发现有过活动的迹象,其最新活动年代可能在中更新世。而天津北断裂也未发现晚更新世以来存在活动的迹象,该断裂在早更新世早期可能有过活动。由此可见,天津南断裂活动性可能要强于天津北断裂。同时发现,第2、第3、第4海相层在不同的地区存在不同程度的缺失现象。因此,在将其用于地层对比时,必须同时确定各海相层的地质年代,否则对比结果可能会出错。对于发生年代存在争议的第2海相层,认为其形成时间应在7万a左右。
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| 关 键 词： | 天津断裂 海相层 地层对比 断层活动性 |
A STUDY ON THE QUATERNARY ACTIVITY OF TIANJIN FAULT |
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| Abstract: | Tianjin Fault includes south Tianjin Fault and north Tianjin Fault.Based on the results of artificial seismic exploration,four borehole profiles were laid out respectively at west of Jinghai county town,Chaomidian village of Xiqing district,Xiaonanhe village of Xiqing district,and Zhutoudian village of Ninghe county to implement the exploration of these faults.Through identification of microfossils,the locations of marine strata in boreholes were obtained in this work,and through stratigraphic dating,the ages of the first,second and third marine strata were determined.Through strata contrast with the marine strata as key marker horizons and integrating with the test results of paleo geomagnetism of BZ2 and TN3 bores,the activity of north Tianjin North and south Tianjin Fault was analyzed.The result indicates that there have been no signs of movement of the south Tianjin Fault since late Pleistocene,and it might have weak activity before middle Pleistocene.No sign of activity of the nor |
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| Keywords: | Tianjin Fault marine strata strata contrast fault activity |
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