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地震 ›› 2009, Vol. 29 ›› Issue (4): 123-130.

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江汉盆地构造模式和演化及其与中强地震关系研究

杨攀新1,2, 高战武1, 张俊3   

  1. 1.中国地震局地震预测研究所, 北京 100036;
    2.中国地震局地质研究所, 北京 100029;
    3.中国医学科学院药用植物研究所, 北京 100193
  • 收稿日期:2009-03-25 修回日期:2009-05-31 出版日期:2009-10-31 发布日期:2021-10-15
  • 作者简介:杨攀新(1971-), 男, 安徽怀宁人, 2008年在读博士生, 主要从事地震构造等研究。
  • 基金资助:
    国家科技支撑计划项目(2006BAC13B01-0203); 中国地震局地震预测研究所基本科研业务专项(0207690224)

Structure Model and Evolution of the Jianghan Basin and Relation with Moderate to Strong Earthquakes

YANG Pan-xin1,2, GAO Zhan-wu1, ZHANG Jun3   

  1. 1. Institute of Earthquake Science, CEA, Beijing 100036, China;
    2. Institude of Geology, CEA, Beijing 100029, China;
    3. Institute of Medicinal Plant Development, Beijing 100193, China
  • Received:2009-03-25 Revised:2009-05-31 Online:2009-10-31 Published:2021-10-15

摘要: 本文通过对江汉盆地地震物探的剖析, 结合该地区大地构造环境特点, 指出盆地主要有三个发展阶段组成: 前陆盆地阶段(中三叠—晚侏罗纪), 主要受秦岭大别逆冲推覆, 前缘挠曲形成前陆盆地, 同期形成NW向和NEE—EW向两组断裂, 从而奠定了盆地棋盘格网构造体系; 断陷盆地阶段(白垩纪—老第三纪), 断裂由原逆冲或逆走滑转变为正断性质, 且控制盆地沉积中心, 同时盆地发生顺时针旋转, 岩浆活动强烈; 新第三纪以来盆地阶段, 盆地以坳陷为主, 整体下降, 表现为断裂对盆地沉积控制明显减弱, 岩浆活动停止。 根据石油物探剖面建立了盆地的构造格架, 即盆地内两组断裂及其形成的狭窄低凸起/地垒条带将盆地分为4个NNW向展布和3个NEE向展布凹陷带。 盆地地壳结构和小震分布及震源机制解显示地震集中在沉降最大的潜江—沔阳凹陷带附近, 震源深度优势分布在15 km左右, 即盆地基底附近。

关键词: 江汉盆地, 盆地演化, 构造模式, 地震

Abstract: Through the analysis of petrol seismic exploration profiles and the tectonic background of Jianghan Basin in Hubei province,a evolution model of the basin with 3 phases is proposed. The foreland basin phase was controlled mainly by the thrust of Qinlin-Dabie orogenic area during later Jurassic and middle Triassic; the rift basin phase is controlled by fault and deasil circumvolving with the change of stressing during Cretaceous and Paleocene, with strong magma activity; and in the depression basin phase the basin descends as a whole, and magma activity stopped. With the study of the sections and the basin evolution,a structure pattern is set up. 4 NNW descend belts and 3 NEE descend belts is the main structure separated by faults and low uplands. Combining the data of present stress,GPS and earthquakes,the low risk of earthquake and low activity is concluded for the Jianghan basin,and the hypocentral depth is about 14km or by the bottom of the basin in middle descend belt of Qianjiang-Mianyang.

Key words: Jianghan Basin, Basin evolution, Structure pattern, Earthquake

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