郯庐断裂带渤海段第四纪活动规律探讨
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摘要
郯庐断裂带渤海段也称为营潍断裂带。文中利用一系列地震剖面,对营潍断裂带第四纪活断层的几何学特征、活动方式与时间、应力场及活动性进行了综合分析,探讨其第四纪活动规律。结果表明,该断裂带第四纪以来活动广泛而强烈,基本上继承了新近纪的断裂格局,由东、西两支主干断裂构成,各自呈左阶雁列式展布。其主干断裂在第四系内陡立的断面、常见的第四系背斜构造及区域上NEE SWW向挤压应力状态,皆表明该断裂带第四纪以来呈逆右行平移活动。大量的地震剖面揭示,该断裂带渤中地区为全新世活断层,而潍北—莱州湾和辽东湾地区呈现为全新世、晚更新世与第四纪活断层相间出现的现象。地震分布表明,该断裂带近代在中段渤中地区活动性最强,而南、北段活动性较弱。
The Bohai segment of the Tan-Lu Fault Zone is also called the Yingwei Fault Zone.On the basis of a series of seismic profiles,the Quaternary activities of the Yingwei Fault Zone,including fault geometry,the mode and time of the activities,and the stress field and activity,are analyzed in this study.The results show that the activities of the fault zone are extensive and intense since the Quaternary.Active faults in the zone mostly inherited Neogene faults,and are composed of eastern and western major faults.Each of the two major faults shows left-stepped,en echelon arrangement.Their steeply-dipping fault planes in the Quaternary sediments,the common Quaternary anticlines and the ENE WSW regional compression stress field all suggested that the fault zone has undergone the reverse dextral slip since the Quaternary.Many seismic profiles revealed that the active faults in the Bozhong area,the center of the Bohai Sea,are active since the Holocene,whereas in the Weibei,Laizhou Bay and Liaodong Bay areas,the active faults were alternately present in the Holocene,the Late Pleistocene and the Quaternary.Earthquake distribution shows that recent fault activity is most intense in the Bozhong area and relatively weak along the northern and southern segments.
The Bohai segment of the Tan-Lu Fault Zone is also called the Yingwei Fault Zone.On the basis of a series of seismic profiles,the Quaternary activities of the Yingwei Fault Zone,including fault geometry,the mode and time of the activities,and the stress field and activity,are analyzed in this study.The results show that the activities of the fault zone are extensive and intense since the Quaternary.Active faults in the zone mostly inherited Neogene faults,and are composed of eastern and western major faults.Each of the two major faults shows left-stepped,en echelon arrangement.Their steeply-dipping fault planes in the Quaternary sediments,the common Quaternary anticlines and the ENE WSW regional compression stress field all suggested that the fault zone has undergone the reverse dextral slip since the Quaternary.Many seismic profiles revealed that the active faults in the Bozhong area,the center of the Bohai Sea,are active since the Holocene,whereas in the Weibei,Laizhou Bay and Liaodong Bay areas,the active faults were alternately present in the Holocene,the Late Pleistocene and the Quaternary.Earthquake distribution shows that recent fault activity is most intense in the Bozhong area and relatively weak along the northern and southern segments.
引文
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[4]李达,张志珣,张维冈,等.渤海海域及邻区新构造运动特征与环境地质意义[J].海洋地质动态,2009,25(2):1-7.
[5]王志才,邓起东,杜宪宋,等.莱州湾海域郯庐断裂带活断层探测[J].地震学报,2006,28(5):493-503.
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[7]邓荣敬,徐备,漆家福,等.营口—潍坊断裂带新生代盆地构造沉降对相邻板块运动的响应[J].北京大学学报,2008,44(3):439-446.
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[9]邓起东,闵伟,晁洪太,等.渤海地区新生代构造与地震活动[M]∥新构造与环境.北京:地震出版社,2001:218-233.
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[13]王洪聚,刘保华,李西双.晚更新世以来渤海南部海域断裂活动性[J].地球科学进展,2011,26(5):556-564.
[14]高祥林.渤海中部郯庐断裂带的近期活动与渤海新近纪新生断裂[J].地质科学,2006,41(2):355-364.
[15]徐杰,牛嘉玉,吕悦军,等.营口—潍坊断裂带的新构造和新构造活动[J].石油学报,2009,30(4):498-505.
[16]周斌,邓志辉,晁洪太,等.营潍断裂带走滑构造特征、演化及动力学机制[J].西北地震学报,2008,30(2):117-123.
[17]徐杰,周本刚,计凤桔,等.渤海地区新构造格局[J].石油学报,2011,32(3):442-449.
[18]孙磉礅.营潍断裂带结构特征及其与相邻盆地的关系[J].大地构造与成矿学,2008,32(4):418-426.
[19]万桂梅,汤良杰,周心怀,等.渤海海域新近纪—第四纪断裂特征及形成机制[J].石油学报,2010,31(4):591-595.
[20]詹润.渤海海域新近纪断层成因和动力学状态[J].地学前缘,2013,20(4):151-165.
[21]周建勋,周建生.渤海湾盆地新生代构造变形机制:物理模拟和讨论[J].地球科学,2006,36(6):507-519.
[22]陈国光,徐杰,马宗晋,等.渤海盆地现代构造应力场与强震活动[J].地震学报,2004,26(4):396-403.
[23]王国纯.郯庐断裂带与渤海海域反转构造及花状构造[J].中国海上油气(地质),1998,12(5):289-295.
[24]黄雷,周心怀,刘池洋.渤海海域新生代盆地演化的重要转折期:证据及区域动力学分析[J].地球科学,2012,42(6):893-904.
[25]龚再升.中国近海盆地晚期断裂活动和油气成藏[J].中国石油勘探,2004,9(2):12-19.
[26]龚再升.中国近海含油气盆地新构造运动与油气成藏[J].地球科学,2004,29(5):513-517.
[27]龚再升,王国纯.渤海新构造运动控制晚期油气成藏[J].石油学报,2001,22(2):1-7.
[28]朱光,宋传中,牛漫兰,等.郯庐断裂带的岩石圈结构及其成因分析[J].高校地质学报,2002,8(3):248-256
[29]Chen L,Zheng T Y,Xu W W.A thinned lithospheric image of the Tanlu Fault Zone,eastern China:Constructed from wave equation based receiver function migration[J].Journal of Geophysical Research,2006,111:B09312.
[30]Zheng T Y,Zhao L,Xu W W,et al.Insight into modifica-tion of North China Craton from seismological study in the Shandong Province[J].Geophysical Research Letters,2008,35:L22305.
[31]朱日祥,徐义刚,朱光,等.华北克拉通破坏[J].地球科学,2012,42(8):1135-1159.
[32]Zhu G,Liu G S,Niu M L,et al.Syn-collisional transform faulting of the Tan-Lu fault zone,East China[J].Interna-tional Journal of Earth Sciences,2009,98:135-155.
[33]Zhu G,Niu M L,Xie C L,et al.Sinistral to normal faulting along the Tan-Lu Fault Zone:Evidence for geodynamic switc-hing of the East China Continental Margin[J].The Journal of Geology,2010,118:277-293.
[34]Zhu G,Wang Y S,Liu G S,et al.40 Ar/39 Ar dating of strike-slip motion on the Tan-Lu fault zone,East China[J].Journal of Structural Geology,2005,27:1379-1398.
[35]Wang Y.The onset of the Tan-Lu fault movement in eastern China:Constraints from zircon(SHRIMP)and 40 Ar/39 Ar dat-ing[J].Terra Nova,2006,18:423-431.
[36]朱光,张力,谢成龙,等.郯庐断裂带构造演化的同位素年代学制约[J].地质科学,2009,44(4):1327-1342.
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