王瑜. 大别山北麓地区的构造格局[J]. 地质通报, 1994, (2).
    引用本文: 王瑜. 大别山北麓地区的构造格局[J]. 地质通报, 1994, (2).
    WANG Yu. THE TECTONIC FRAMEWORK IN THE NORTHERN PIEDMONT AREA OF THE DABIE MOUNTAINS[J]. Geological Bulletin of China, 1994, (2).
    Citation: WANG Yu. THE TECTONIC FRAMEWORK IN THE NORTHERN PIEDMONT AREA OF THE DABIE MOUNTAINS[J]. Geological Bulletin of China, 1994, (2).

    大别山北麓地区的构造格局

    THE TECTONIC FRAMEWORK IN THE NORTHERN PIEDMONT AREA OF THE DABIE MOUNTAINS

    • 摘要: 大别山北麓在构造上又称北淮阳构造带,它以桐柏一磨子潭断裂为界与其南的大别山造山带相邻。区内出露的构造一地层单元有商城群(Pz_1)、信阳群(D)、石炭系、侏罗系等。研究表明,大别山北麓地区的构造是一个以信阳一舒城逆掩断层为底板断层与一系列次级冲断层、断片构成的逆冲推覆系统。卷入逆掩断层上下盘的地层经历了C_3-J_3期间的三次褶皱变形(第一、二次为挤压作用机制,第三次为剪切机制)。逆冲方向为由南向北,约NE20°~30°,逆冲断层以背驮式向前陆扩展,形成机制为反向逆冲推覆,且与大别山造山带主体向南韧性剪切滑脱运动关系密切。

       

      Abstract: Tectonically the northern foot of the Dabie Mountains is also called the North Huaiyang tec-tonic belt. It is separated from the Dabie orogenic belt to its south by the Tongbai- Moztan fault. The tectono-stratigraphic units exposed in the area include the Shangcheng Group(Pz1),WinyangGroup(D) ,Carboniferous and Jurassic, Study indicates that the tectonics in the northern piedmontarea of the Dabie Mountains is represented by a thrust nappe system composed of the Xinyang-Shucheng overthrust fauit(as a sole fault)and a series of secondary thrusts and slices. The stratainvovedin the hanging wall and footwall of the overthrust underwent three phases of folding dur-ing the Late Carboniferous and Late Jurassic(the foiding of the first and second phases resultedfrom compression , while that of the third from shear). The thrusting was north-vergent with avergence of about NE 20-30℃。 The thrusts developed toward the foreland in the form of a trailingimbricate fan. The formation time was Middle to Late Jurassic. The formation mechanisrn wasbackthrusting and closely related to the southward ductile shear decoupling motion of the bulkpart of the Dabie orogenic belt.

       

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