天津断裂第四纪活动性研究
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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。
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 north Tianjin Fault has been found since late Pleistocene either,and it might be active in the early stage of early Pleistocene.These show that the activity of the south Tianjin Fault is stronger than that of the north Tianjin Fault.At the same time,we find that the second,third and fourth marine strata are lacking to some extent in different areas.So,before they are used in strata contrast,the age of marine strata must be determined,otherwise the results of strata contrast may lead to mistake.For the second marine stratum,where there has been dispute about its age,we consider the age is about 70ka or so.
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 north Tianjin Fault has been found since late Pleistocene either,and it might be active in the early stage of early Pleistocene.These show that the activity of the south Tianjin Fault is stronger than that of the north Tianjin Fault.At the same time,we find that the second,third and fourth marine strata are lacking to some extent in different areas.So,before they are used in strata contrast,the age of marine strata must be determined,otherwise the results of strata contrast may lead to mistake.For the second marine stratum,where there has been dispute about its age,we consider the age is about 70ka or so.
引文
[1]物探局物探地质技术开发公司,1997,天津市及周边地区地震地质综合研究报告。
[2]国家地质总局航空物探大队904队,1978,京津唐地区航空磁测报告。
[3]卫鹏飞,李一兵,2003,天津市区域地质资料收集和地震地质调查(天津市地震局工作报告)。
[1]王强,宋大伟等,天津市第四系沉积结构与地下水赋存条件分析,1994,地质矿产部天津地质矿产研究所工作报告。
[1]邵永新,陈宇坤等,2006,晚第四纪标准物探解释与地层剖面的建立技术报告(天津市地震局)。
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陈宇坤,李振海,邵永新,等.2008.天津地区第四纪年代地层剖面研究[J].地震地质,30(2):383—399.CHEN Yu-kun,LI Zhen-hai,SHAO Yong-xin,et al.2008.Study on the Quaternary chronostratigraphic section in Tian-jin srea[J].Seismology and Geology,30(2):383—399(in Chinese).
李华梅,王俊达,安芷生.1977.河北衡水地区钻孔岩心的古地磁研究[J].地球化学,(3):210—218.LI Hua-mei,WANG Jun-da,AN Zhi-sheng.1977.Magnetostratigraphic studies of borehole cores in Hengshui,Hebei[J].Geochimica,(3):210—218(in Chinese).
李华梅,王俊达.1983.渤海湾北岸平原钻孔岩心的古地磁研究[J].地球化学,(2):198—204.LI Hua-mei,WANG Jun-da.1983.Magnetostratigraphic studies of borehole cores in the northern coastal plain,BohaiBay[J].Geochimica,(2):198—204(in Chinese).
天津市地质矿产局.1992.天津市区域地质志[M].北京:地质出版社.Bureau of Geology and Mineral Resources of Tiangjin Municipality.1992.Regional Geology of Tianjin Municipality[M].Geological Publishing House,Beijing(in Chinese).
王强,李凤林,李玉德,等.1986.十五万年来渤海西、南岸平原海岸线变迁[A].见:国际地质对比计划第200号项目中国工作组编.中国海平面变化.北京:海洋出版社.WANG Qiang,LI Feng-lin,LI Yu-de,et al.1986.Evolution of coast line in the south and west coast plain,Bohai overthe past150ka[A].In:International Geological Correlation Programme Project No.200China Working Group(ed).Sea-level Change in China.China Ocean Press,Beijing(in Chinese).
杨子赓,李幼军,丁秋玲,等.1979.试论河北平原东部第四纪几个基本问题[J].地质学报,(4):263—279.YANG Zi-geng,LI You-jun,DING Qiu-ling,et al.1979.Some fundamental problems of Quaternary geology of easternHebei plain[J].Acta Geologica Sinica,(4):263—279(in Chinese).
姚政权,郭正堂,陈宇坤,等.2006.渤海湾海陆交互相沉积的磁性地层学[J].海洋地质与第四纪地质,26(1):9—15.YAO Zheng-quan,GUO Zheng-tang,CHEN Yu-kun,et al.2006.Magnetostratigraphy of marine-terrigenous facies de-posits in Bohai bay[J].Marine Geology&Quaternary Geology,26(1):9—15(in Chinese).
[2]国家地质总局航空物探大队904队,1978,京津唐地区航空磁测报告。
[3]卫鹏飞,李一兵,2003,天津市区域地质资料收集和地震地质调查(天津市地震局工作报告)。
[1]王强,宋大伟等,天津市第四系沉积结构与地下水赋存条件分析,1994,地质矿产部天津地质矿产研究所工作报告。
[1]邵永新,陈宇坤等,2006,晚第四纪标准物探解释与地层剖面的建立技术报告(天津市地震局)。
陈望和,倪明云.1987.河北第四纪地质[M].北京:地质出版社.116—170.CHEN Wang-he,NI Ming-yun.1987.Quaternary Geology of Heibei Province[M].Geological Publishing House,Bei-jing.116—170(in Chinese).
陈宇坤,任峰,张翠芬,等.2004.天津海河隐伏断裂的晚第四纪活动特征研究[J].地震地质,26(1):111—121.CHEN Yu-kun,REN Feng,ZHANG Cui-fen,et al.2004.Characteristics of the late Quaternary activity of Haihe buriedfault in Tianjin Municipality[J].Seismology and Geology,26(1):111—121(in Chinese).
陈宇坤,李振海,邵永新,等.2008.天津地区第四纪年代地层剖面研究[J].地震地质,30(2):383—399.CHEN Yu-kun,LI Zhen-hai,SHAO Yong-xin,et al.2008.Study on the Quaternary chronostratigraphic section in Tian-jin srea[J].Seismology and Geology,30(2):383—399(in Chinese).
李华梅,王俊达,安芷生.1977.河北衡水地区钻孔岩心的古地磁研究[J].地球化学,(3):210—218.LI Hua-mei,WANG Jun-da,AN Zhi-sheng.1977.Magnetostratigraphic studies of borehole cores in Hengshui,Hebei[J].Geochimica,(3):210—218(in Chinese).
李华梅,王俊达.1983.渤海湾北岸平原钻孔岩心的古地磁研究[J].地球化学,(2):198—204.LI Hua-mei,WANG Jun-da.1983.Magnetostratigraphic studies of borehole cores in the northern coastal plain,BohaiBay[J].Geochimica,(2):198—204(in Chinese).
天津市地质矿产局.1992.天津市区域地质志[M].北京:地质出版社.Bureau of Geology and Mineral Resources of Tiangjin Municipality.1992.Regional Geology of Tianjin Municipality[M].Geological Publishing House,Beijing(in Chinese).
王强,李凤林,李玉德,等.1986.十五万年来渤海西、南岸平原海岸线变迁[A].见:国际地质对比计划第200号项目中国工作组编.中国海平面变化.北京:海洋出版社.WANG Qiang,LI Feng-lin,LI Yu-de,et al.1986.Evolution of coast line in the south and west coast plain,Bohai overthe past150ka[A].In:International Geological Correlation Programme Project No.200China Working Group(ed).Sea-level Change in China.China Ocean Press,Beijing(in Chinese).
杨子赓,李幼军,丁秋玲,等.1979.试论河北平原东部第四纪几个基本问题[J].地质学报,(4):263—279.YANG Zi-geng,LI You-jun,DING Qiu-ling,et al.1979.Some fundamental problems of Quaternary geology of easternHebei plain[J].Acta Geologica Sinica,(4):263—279(in Chinese).
姚政权,郭正堂,陈宇坤,等.2006.渤海湾海陆交互相沉积的磁性地层学[J].海洋地质与第四纪地质,26(1):9—15.YAO Zheng-quan,GUO Zheng-tang,CHEN Yu-kun,et al.2006.Magnetostratigraphy of marine-terrigenous facies de-posits in Bohai bay[J].Marine Geology&Quaternary Geology,26(1):9—15(in Chinese).
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