江汉盆地白垩-新近系主要不整合面剥蚀量分布及其构造意义 The Erosion Distribution of Major Unconformities an

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江汉盆地白垩-新近系主要不整合面剥蚀量分布及其构造意义

The Erosion Distribution of Major Unconformities and Its Tectonic Significance of Cretaceous-Neogene Jianghan Basin

江汉盆地白垩-新近系由于构造作用产生了多个不整合面,地震剖面上为T11、T10、T9、T8′、T8、T7和T1反射界面,在盆地内的不同部位易于识别,具有明显的角度不整合或侵蚀不整合界面特征.古近系和新近系之间的T1不整合面形成于古近纪末期的盆地整体抬升,对下伏地层造成不同程度的剥蚀,沿盆地南缘的剥蚀层位深,剥蚀量大,反映盆地南缘整体相对隆起,与江南古陆的隆起作用有关.T1界面剥蚀带走向以北西向为主,反映了盆地在古近纪末受到了北东-南西向的挤压或压扭作用,该作用造成盆地整体抬升,强化了北西向展布的低凸起,产生了近北西向的洼陷和剥蚀带.盆内主要的剥蚀带主要受控于早期北西向断裂反转造成的隆起作用,另外,北东、北北东向断裂也存在压扭性逆冲作用,造成局部强烈隆升并遭受剥蚀.对T10、T8′、T8和T7不整合面剥蚀量的平面编图表明,白垩系基本全区遭受剥蚀,T8′、T8界面只造成区内局部剥蚀,T7界面的剥蚀量在南部最大,向盆地内减小,反映了盆地南部江南古陆的早期发育.水利论文["l _|R5b T.x0UX

作 者: 刘景彦 林畅松 卢林 蔡文杰 王必金 董伟 LIU Jing-yan LIN Chang-song LU Lin CAI Wen-jie WANG Bi-jin DONG Wei  
作者单位:中国地质大学,北京,100083 
刊 名:地质科技情报  ISTIC PKU
英文刊名:GEOLOGICAL SCIENCE AND TECHNOLOGY INFORMATION 
年,卷(期):2009 28(1) 
分类号:P548 
关键词:不整合面   剥蚀量   构造意义   白垩-新近纪   江汉盆地  
机标关键词:江汉盆地白垩系角度不整合剥蚀量分布构造意义Jianghan Basin压扭作用北西向界面特征整体抬升盆地南缘江南古陆隆起古近纪北东向断裂早期发育盆地南部逆冲作用局部 
基金项目:国家重点基础研究发展规划(973计划) 
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