摘要
印支期以来江汉平原区经历了多期构造运动的叠加和改造,中、古生界的构造特征总体以南北造山对冲挤压为特点,形成南部受控于雪峰-江南造山带的八面山-大磨山弧形构造带和北部受控于东秦岭-大别造山带的大洪山弧形构造带两大弧形构造体系,且以南部弧形构造带为主体。早燕山期是弧形构造的主要发育期,南部弧形构造带首先形成雏形,前缘断裂为问安寺-纪山寺-潜北-天门河断裂,随后秦岭-大别碰撞造山,产生自北东向南西的挤压应力,北部大洪山弧形构造带开始发育,并对南部弧形构造带产生叠加和改造作用,在荆州-大冶地区形成对冲干涉构造带;晚燕山-早喜山期,构造负反转,荆州-沔阳地区强烈断陷,使得对冲干涉构造带隐伏于江汉盆地白垩-新近系之下,成为隐伏前锋构造。多期次的构造作用,使研究区发育挤压收缩构造、走滑压扭构造及伸展反转构造三大类基本构造样式。
The marine Mesozoic-Paleozoic in Jianghan plain has experienced multi-period deformations and superpositions since Indochina period, resulting in a counter-thrust and compress tectonic framework with S to N thrust in the south and NE to NW thrust in the north. The two great arc structure systems are thus formed： the Bamianshan-Damoshan arc structure located in the south, and the Dahongshan arc structure located in the north. The former is a main structure, whose formation and evolution are mostly controlled by the Xuefeng-Jiangnan orogenic belt, while the latter is mostly controlled by east Qinling-Dabie orogenic belt. The two systems were mainly developed and shaped in early Yanshanian, when the south arc structure embryo was formed with its front-fault as Wenansi-Jishansi-Qianbei-Tianmenhe fault before the north arc structure which was developed in the compress stress field from NE to NW due to the orogenics of east Qinling-Dabie orogenic belt,and reformed the south arc structure. Both of them are connected composited in Jingzhou-Mianyang region in the middle of Jianghan plain,resulting in a counter-thrust and interference structural belt. The Jingzhou-Mianyang interference belt was buried under Cretaceous-Paleogene stratum of Jianghan basin during the late Yanshanian period to early Himalayan period for the reason of tectonic negative reversion, and became buried front structure.
出处
《地质科技情报》
CAS
CSCD
北大核心
2008年第2期34-38,共5页
Geological Science and Technology Information
基金
中国石化江汉油田分公司科研项目
关键词
中
古生界
构造格架
弧形构造
构造样式
构造演化
江汉平原区
Mesozoic-Paleozoic
tectonic framework
arc structure
tectonic style
tectonic evolution
Jianghan plain region
