从地震信息看新生代郯庐断裂带的展布与活动
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摘要
郯庐前新近纪断裂带为中国东部滨太平洋地区一条巨型张扭走滑构造带。利用地震信息分析地质结构,可将其分为南、中、北三大段和七亚段。按其影响范围的规模可划分为广义和狭义两类:广义郯庐前新近纪断裂带地质结构是"两凹夹一隆",狭义郯庐前新近纪断裂带则指高垒带与两侧(邻)的断层组合。断裂带内外都发育有反转、花状构造。狭义郯庐前新近纪断裂带走向为NNE,仅在嘉山以南为NE向,其两侧的前新近纪断层大体上都为EW、NE和NEE走向,与狭义郯庐断裂呈锐角相切。古近纪构造层中,由南到北郯庐断层两侧箕状断陷边界都由生长断层所组成,说明郯庐断裂两侧的古近纪断陷应属拉张盆地,并非拉分盆地,郯庐古近纪断裂动力学是拉张而非拉分构造应力场。古近纪构造层在拉张翘倾运动中叠加了右旋走滑地质应力,这种右旋走滑应力是太平洋板块向西俯冲至欧亚板块之下的结果。中生代郯庐断裂的动力学表现为库拉板块向北俯冲至欧亚板块之下形成的左旋平移现象。郯庐断裂NE向平移走滑与北西向隐蔽断裂的相交处是发生破坏性地震的构造部位,因此,应特别重视对高丽营北东向生长断层与渤中—孙河—南口北西向隐蔽断层相交处地震动向的监控。
The Tanlu fault belt,being a pre-Neogene giant fault belt located in the marginal Pacific area of East China,can be divided into southern,central and northern segments,and seven sub-segments based on the geologic contexture shown in seismic data.In petroleum industry,there are two different views on the belt in terms of effective extension of the belt,i.e.the broad sense of Tanlu fault belt and the narrow sense of Tanlu fault belt.The geological contexture of the broad sense of pre-Neogene Tanlu fault belt includes two basins separated by the central uplift,and the geological contexture of the narrow sense of Tanlu fault belt consists of a central horst belt and the faults on its both sides.The broad sense of Tanlu fault belt is unacceptable because of its broadening the limitation of Tanlu fault belt and the existence of inversion and flower structures developed both inside and outside of the belt.The general extension of the narrow sense of Tanlu fault belt is NNE,and changes to NE on the south of Jiashan.The pre-Neogene faults(extending EW,NE and NEE)on both sides of the belt intersect the belt with acute angles.The boundary faults of all Paleogene half-grabens developed on both sides of the belt from north to south are growth faults.It indicates that the Paleogene basins are extension basins rather than the pull-apart basin.The dextral strike-slip stress superimposed on the paleogene structural layer was caused by the under-thrusting of Pacific plate beneath the Eurasian plate.The left translational movement of the belt resulted from the north under-thrusting of Kula plate beneath the Eurasian plate during the Mesozoic.The intersection position of Tanlu NE translational strike-slipping fault and the subtle faults extending NW is the structural position for earthquake generation.So,we should pay more attention to supervise the earthquake activity in the intersection position of Gaoliying growth fault(extending NE)and the subtle fault of Bozhong-Sunhe-Nankou which extending NW.
The Tanlu fault belt,being a pre-Neogene giant fault belt located in the marginal Pacific area of East China,can be divided into southern,central and northern segments,and seven sub-segments based on the geologic contexture shown in seismic data.In petroleum industry,there are two different views on the belt in terms of effective extension of the belt,i.e.the broad sense of Tanlu fault belt and the narrow sense of Tanlu fault belt.The geological contexture of the broad sense of pre-Neogene Tanlu fault belt includes two basins separated by the central uplift,and the geological contexture of the narrow sense of Tanlu fault belt consists of a central horst belt and the faults on its both sides.The broad sense of Tanlu fault belt is unacceptable because of its broadening the limitation of Tanlu fault belt and the existence of inversion and flower structures developed both inside and outside of the belt.The general extension of the narrow sense of Tanlu fault belt is NNE,and changes to NE on the south of Jiashan.The pre-Neogene faults(extending EW,NE and NEE)on both sides of the belt intersect the belt with acute angles.The boundary faults of all Paleogene half-grabens developed on both sides of the belt from north to south are growth faults.It indicates that the Paleogene basins are extension basins rather than the pull-apart basin.The dextral strike-slip stress superimposed on the paleogene structural layer was caused by the under-thrusting of Pacific plate beneath the Eurasian plate.The left translational movement of the belt resulted from the north under-thrusting of Kula plate beneath the Eurasian plate during the Mesozoic.The intersection position of Tanlu NE translational strike-slipping fault and the subtle faults extending NW is the structural position for earthquake generation.So,we should pay more attention to supervise the earthquake activity in the intersection position of Gaoliying growth fault(extending NE)and the subtle fault of Bozhong-Sunhe-Nankou which extending NW.
引文
[1]刘前志,王子非.渤海湾盆地西部构造演化的研究.郯庐断裂的地球物理属性及潜在含油气地区预测.石油地球物理勘探局物探地质研究院内部资料,1996.
[1]王桂良,云武,荆惠林,等.佳依—敦密断裂带及其对煤、油、气的控制作用.中国矿业大学、东煤地质局内部资料,1994.
[1]原石油化工部石油物探局研究所.华北平原石油勘探成果图册.1974:6.
[1]Geological Research Institute,State Bureau of Seismology.Tanlu Fault Belt[M].Beijing:Geological Publishing House,1987(in Chinese).
[2]Wan T F,Zhu H,Zhao L,et al.Formation and evolution of Tanlu fault belt[J].Geoscience,1996,10(2):159-168(in Chinese).
[3]Yang KS.Contexture of Hydrocarbon Bearing Basinsin Chi-na and Seismic Interpretation of Structural Style[M].Bei-jing:PetroleumIndustry Press,2006(in Chinese).
[4]Institute of Geology,Chinese Academy of Sciences.An In-troduction to Seismologic Geology of China[M].Beijing:Science Press,1974(in Chinese).
[1]国家地震局地质研究所.郯庐断裂[M].北京:地质出版社,1987.
[2]万天丰,朱鸿,赵磊,等.郯庐断裂带的形成与演化综述[J].现代地质,1996,10(2):159-168.
[3]杨克绳.中国含油气盆地结构和构造样式地震解释[M].北京:石油工业出版社,2006.
[4]中国科学院地质研究所.中国地震地质概论[M].北京:科学出版社,1974.
[1]王桂良,云武,荆惠林,等.佳依—敦密断裂带及其对煤、油、气的控制作用.中国矿业大学、东煤地质局内部资料,1994.
[1]原石油化工部石油物探局研究所.华北平原石油勘探成果图册.1974:6.
[1]Geological Research Institute,State Bureau of Seismology.Tanlu Fault Belt[M].Beijing:Geological Publishing House,1987(in Chinese).
[2]Wan T F,Zhu H,Zhao L,et al.Formation and evolution of Tanlu fault belt[J].Geoscience,1996,10(2):159-168(in Chinese).
[3]Yang KS.Contexture of Hydrocarbon Bearing Basinsin Chi-na and Seismic Interpretation of Structural Style[M].Bei-jing:PetroleumIndustry Press,2006(in Chinese).
[4]Institute of Geology,Chinese Academy of Sciences.An In-troduction to Seismologic Geology of China[M].Beijing:Science Press,1974(in Chinese).
[1]国家地震局地质研究所.郯庐断裂[M].北京:地质出版社,1987.
[2]万天丰,朱鸿,赵磊,等.郯庐断裂带的形成与演化综述[J].现代地质,1996,10(2):159-168.
[3]杨克绳.中国含油气盆地结构和构造样式地震解释[M].北京:石油工业出版社,2006.
[4]中国科学院地质研究所.中国地震地质概论[M].北京:科学出版社,1974.
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