南黄海北部千里岩隆起带的第四纪活动断裂
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摘要
前人对南黄海北部千里岩隆起带的活动断裂研究开展较少,文中利用908专项地球物理调查获得的覆盖整个千里岩隆起带的多道地震数据,在钻井及其他地震资料进行层位标定的基础上,对研究区的第四纪断裂活动性进行了研究。研究表明,千里岩隆起带主要的第四纪活动断裂(带)有3条,从南至北依次为千里岩南缘断裂带、千里岩隆起带3号断裂和2号断裂。这几条断裂(带)基本平行,均为NE走向;在剖面上断裂都较为平直。千里岩隆起带南缘断裂带最新活动时间在大部分剖面上至少为中更新世,部分区段为早更新世;千里岩隆起带2号断裂最新活动时间为早更新世;千里岩隆起带3号断裂最新活动时间为中-晚更新世。千里岩隆起带南缘断裂变形强弱走向上有变化,变形强弱和断裂平面轨迹的曲率呈现很好的对应关系,曲率大的地方变形强,曲率小的地方变形弱,暗示主压应力为NW向,可能源于菲律宾板块和欧亚板块的NW向汇聚作用。沿着千里岩隆起带南缘断裂带有一些3级以上地震分布,考虑千里岩隆起带南缘断裂带第四纪的变形较强,因此认为这条断裂带发生大地震的可能性比较大。
By far,there have been only a few neotectonic studies of the Qianliyan Uplift. In recent years,we have gathered multi-channel seismic data covering the whole uplift. After interpretation,we recognized three major Quaternary faults/fault zones. They are the South Boundary Fault Zone(SBFZ),F3,and F2 from south to north,respectively. These faults are almost parallel each other and trend northeastward.The SBFZ on most sections has been active at least since the middle Pleistocene; some segments of SBFZ are active since the Early Pleistocene.The latest activity of F2 is in the Early Pleistocene while that of the F3 is in the Middle-Early Pleistocene.The deformation intensity of SBFZ varies along strike and is well correlated with the curvature of the fault trace, that is,big curvature correlates with big deformation intensity. This correlation implies a NW maximum principal stress that may be caused by the relative convergence of the Philippine Sea Plate and the Euro-Asia Plate.The map of earthquake epicenters(≥MS 3.0)shows that there are several earthquakes distributed roughly along the SBFZ.Considering the relative intense deformation of SBFZ,we propose that great attention should be paid to the seismic risk of SBFZ.
By far,there have been only a few neotectonic studies of the Qianliyan Uplift. In recent years,we have gathered multi-channel seismic data covering the whole uplift. After interpretation,we recognized three major Quaternary faults/fault zones. They are the South Boundary Fault Zone(SBFZ),F3,and F2 from south to north,respectively. These faults are almost parallel each other and trend northeastward.The SBFZ on most sections has been active at least since the middle Pleistocene; some segments of SBFZ are active since the Early Pleistocene.The latest activity of F2 is in the Early Pleistocene while that of the F3 is in the Middle-Early Pleistocene.The deformation intensity of SBFZ varies along strike and is well correlated with the curvature of the fault trace, that is,big curvature correlates with big deformation intensity. This correlation implies a NW maximum principal stress that may be caused by the relative convergence of the Philippine Sea Plate and the Euro-Asia Plate.The map of earthquake epicenters(≥MS 3.0)shows that there are several earthquakes distributed roughly along the SBFZ.Considering the relative intense deformation of SBFZ,we propose that great attention should be paid to the seismic risk of SBFZ.
引文
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周本刚,冉勇康,环文林,等.2002.山东海阳断裂东石兰沟段晚更新世以来地表断错特征与最大潜在地震估计[J].地震地质,24(2):159—166.ZHOU Ben-gang,RAN Yong-kang,HUAN Wen-lin,et al.2002.Late Plestocene surface faulting and the maximum po-tential earthquake on the Dongshilangou segment of the Haiyang Fault,Shangdong Province[J].Seismology andGeology,24(2):159—166(in Chinese).
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费美高,许模.1996.山东荣成地区新断裂网络的遥感图像解译[J].地质灾害与环境保护,7(1):95—103.FEI Mei-gao,XU Mo.1996.The remote sensing image interpretation of neo-fault net in Rongchen County,ShangdongProvince[J].Journal of Geological Hazards and Environment Preservation,7(1):95—103(in Chinese).
冯志强,陈春峰,姚永坚,等.2008.南黄海北部前陆盆地的构造演化与油气突破[J].地学前缘,15(6):219—231.FENG Zhi-qiang,CHEN Chun-feng,YAO Yong-jian,et al.2008.Tectonic evolution and exploration target of the north-ern foreland basin of the South Yellow Sea[J].Earth Science Frontiers,15(6):219—231(in Chinese).
韩宗珠,肖莹,于航,等.2007.南黄海千里岩岛榴辉岩的矿物化学及成因探讨[J].海洋湖沼通报,(1):83—87.HAN Zong-zhu,Xiao Ying,YU Hang,et al.2007.A study on the mineralchemistry and genesis of the eclogite fromQianliyan Island,the Southern Huanghai Sea[J].Transactions of Oceanology and Limnology,(1):83—87(inChinese).
郝天珧,刘伊克,徐万哲.1998.黄海和邻区重磁场及区域构造特征[J].地球物理学进展,13(1):27—39.HAO Tian-yao,LIU Yi-ke,XU Wan-zhe.1998.Features of gravity and magnetic field and regional tectonics of YellowSea and its adjacent area[J].Progress in Geophysics,13(1):27—39(in Chinese).
郝天珧,SUH Mancheol,刘建华,等.2004.黄海深部构造与中朝-扬子块体结合带在海区位置的地球物理特征研究[J].地学前缘,11(3):51—61.HAO Tian-yao,SUH M,LIU Jian-hua,et al.2004.Deep structure and boundary belt position between Sino-Korean andYangtze blocks in Yellow Sea[J].Earth Science Frontiers,11(3):51—61(in Chinese).
侯方辉.2006.南黄海晚第四纪地震地层学与新构造运动研究[D]:[学位论文].青岛:中国海洋大学.HOU Fang-hui.2006.The studying on Late Quaternary seismic stratigraphy and neotectonic movement of the SouthYellow Sea[D].Dissertation.Ocean University of China,Qingdao(in Chinese).
黄永华,尤惠川,宋毅盛,等.2007.山东胶东半岛地区断裂最新活动性研究[J].震灾防御技术,2(1):39—49.HUANG Yong-hua,YOU Hui-chuan,SONG Yi-sheng,et al.2007.Recent activities of faults in Jiaodong Peninsula,Shandong Province,China[J].Technology for Earthquake Disaster Prevention,2(1):39—49(in Chinese).
山东省地震局.2009.20世纪山东十大地震[M].北京:地震出版社.Earthquake Administration of Shandong Province.2009.Top10Serious Earthquakes in the20th Century Occurred inthe Precincts of Shandong Province[M].Seismological Press,Beijing(in Chinese).
王志才,晁洪太,杜宪宋,等.2008.南黄海北部千里岩断裂活动性初探[J].地震地质,30(1):176—186.WANG Zhi-cai,CHAO Hong-tai,DU Xian-song,et al.2008.Preliminary survey on the Quaternary activities of the Qian-liyan Fault in the northern part of the South Yellow Sea[J].Seismology and Geology,30(1):176—186(in Chi-nese).
许东禹,刘锡清,张训华,等.1997.中国近海地质[M].北京:地质出版社.XU Dong-yu,LIU Xi-qing,ZHANG Xun-hua,et al.1997.China Offshore Geology[M].Geological Publishing House,Beijing(in Chinese).
沿海大陆架及毗邻海域油气区石油地质志编写组.1987.中国石油地质志卷十六:沿海大陆架及毗邻海域油气区(上册)[M].北京:石油工业出版社.Writing Group of Oil&Gas Bearing Areas on the Continental Shelf and Its Neighboring Regions.1987.Petroleum Geol-ogy of China,Vol16:Oil&Gas Bearing Areas on the Continental Shelf and Its Neighboring Regions(Part I)[M].Petroleum Industry Press,Beijing(in Chinese).
杨金玉.2009.南黄海盆地与周边构造关系及海相中、古生界分布特征与构造演化研究[D]:[学位论文].杭州:浙江大学.YANG Jin-yu.2009.Research on the tectonic relation between the South Yellow Sea Basin and its adjacent area anddistribution characteristic and tectonic evolution of the Mesozoic-Paleozoic marine strata[D].Dissertation.Zhe-jiang University,Hangzhou(in Chinese).
张文佑,马福臣,李荫槐,等.1984.中国及邻区海陆大地构造基本轮廓[M].北京:石油工业出版社.ZHANG Wen-you,MA Fu-chen,LI Yin-huai,et al.1984.Tectonic Outline of China and Its Adjacent Regions[M].Pe-troleum Industry Press,Beijing(in Chinese).
周本刚,冉勇康,环文林,等.2002.山东海阳断裂东石兰沟段晚更新世以来地表断错特征与最大潜在地震估计[J].地震地质,24(2):159—166.ZHOU Ben-gang,RAN Yong-kang,HUAN Wen-lin,et al.2002.Late Plestocene surface faulting and the maximum po-tential earthquake on the Dongshilangou segment of the Haiyang Fault,Shangdong Province[J].Seismology andGeology,24(2):159—166(in Chinese).
Ernst W G,Tsujimori T,Zhang R,et al.2007.Permo-Triassic collision,subduction-zone metamorphism,and tectonic exhumation along the East Asian continental margin[J].Annual Review of Earth and Planetary Sciences,35(1):73—110.
Faure M,Lin W,Le Breton N.2001.Where is the North-South China block boundary in eastern China?[J].Geology,29(2):119—122.
Yin A,Nie S.1993.An indentation model for the North and South China collision and the development of the Tanlu andHonam Fault systems,Eastern Asia[J].Tectonics,12(4):801—813.
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