江汉平原晚印支期—早燕山期大洪山弧形构造格局及动力学机制

现代地质 ›› 2005, Vol. 19 ›› Issue (Suppl): 165-170.

江汉平原晚印支期—早燕山期大洪山弧形构造格局及动力学机制

刘云生^1,2，郭战峰^1,2，杨振武¹，刘新民¹

1中国石油化工股份有限公司江汉油田分公司勘探开发研究院，湖北潜江433124；
2长江大学地球化学系，湖北荆州434028

收稿日期:2004-09-02 修回日期:2004-10-30 出版日期:2005-03-20 发布日期:2013-04-08
作者简介:刘云生，男，高级工程师，1963年出生，构造地质学专业，主要从事构造地质、石油勘探等研究工作。
基金资助:
中国石油化工股份有限公司科学技术开发研究项目(P02006)。

TECTONIC FRAMEWORK AND GEODYNAMIC MECHANISMS OF DAHONGSHAN ARC STRUCTURE DURING THE LATE INDOSINIAN PERIOD TO EARLY YANSHANIAN PERIOD IN JIANGHAN PLAIN

LIU Yun-sheng^1,2，GUO Zhan-feng^1,2，YANG Zhen-wu¹，LIU Xin-ming¹

1 Exploration & Development Research Institute of Jianghan Oilfield Branch Company，SINOPEC, Qianjiang, Hubei433124，China；
2Department of Geochemistry, Yangtze University，Jingzhou, Hubei434028，China

Received:2004-09-02 Revised:2004-10-30 Online:2005-03-20 Published:2013-04-08

摘要/Abstract

摘要：

晚印支期—早燕山期，由于华北板块与扬子板块陆—陆碰撞，江汉平原处于区域挤压动力场，其边界为青峰—襄樊—广济断裂带、江南逆冲推覆构造带和黄陵隆起。在区域动力场和边界条件的联合作用下形成了尖端指向西南的大洪山弧形构造，其形成演化主要受控于东秦岭—大别造山带的主造山作用过程。弧形构造是一个具有多重叠置的复杂逆冲推覆构造系统，总体上自北东向南西推覆，构造变形趋势由北东向南西从强变弱、由深变浅。纵向剪切断裂带将大洪山弧形构造分割成3个构造单元：当阳—京山构造区、荆州—仙桃构造区和鄂城—大冶构造区，使江汉平原呈现出东西分带、南北分块的构造格局。在晚燕山期—喜山期纵向剪切断裂反转和断陷造成弧形构造带顶部隐伏于江汉盆地白垩系—第三系之下。

关键词: 大洪山, 弧形构造, 逆冲推覆, 剪切断裂, 构造格局, 动力学

Abstract:

Owing to the continent-continent collision between North China and Yangtze continental blocks during the late Indosinian period to early Yanshanian period, Jianghan plain is at the regional compress geodynamic field. Its boundary is east Qingfeng-Xiangfan-Guangji faulted zone and Jiangnan thrusted nappe structure belt and Huangling uplift. Dahongshan arc structure which cusp points to southwest is formed under the condition of the regional geodynamic field and the boundary environments. The formation and evolution of the arc structure are mostly controlled by major orogenic processes in the east Qinling-Dabie orogenic belt. Arc structure is a complex thrusted nappe system with multiple superimposed structures. Generally, the nappe structure moved from the northeast to the southwest. The structural deformation trend of the arc structure changes from strong to weak and deep to shallow from the northeast to the southwest.With the formation of longitudinal shear fracture belts Dahongshan arc structure is divided into three tectonic units, which are Dangyang-Jingshan structural area and Jingzhou-Xiantao structural area and Echeng-Daye structural area. Jianghan plain looks like structural framework with blocks in north-south direction and belts in west-east direction. The top of the arc structure is buried under Cretaceous-Paleogene stratum of Jianghan basin during the late Yanshanian period to the Himalayan period for the reason of tectonic inversion and rift faulting of the longitudinal shear fracture.

Key words: Dahongshan, arc structure, shear fracture, thrusted nappe structure, tectonic framework, geodynamic mechanism

中图分类号:

P542

刘云生，郭战峰，杨振武，刘新民. 江汉平原晚印支期—早燕山期大洪山弧形构造格局及动力学机制[J]. 现代地质, 2005, 19(Suppl): 165-170.

LIU Yun-sheng，GUO Zhan-feng，YANG Zhen-wu，LIU Xin-ming. TECTONIC FRAMEWORK AND GEODYNAMIC MECHANISMS OF DAHONGSHAN ARC STRUCTURE DURING THE LATE INDOSINIAN PERIOD TO EARLY YANSHANIAN PERIOD IN JIANGHAN PLAIN[J]. Geoscience, 2005, 19(Suppl): 165-170.

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