江汉盆地的构造-地质结构样式分析

Anaylsis on Tectonic-geologic Framework Styles in Jianghan Basin

江汉盆地受周缘构造作用的控制和影响,形成了南部和北部两大基底断裂体系,并控制和影响白垩-新近纪的断裂的发育,形成了多方向、不同规模的张性、压性及走滑性质的断裂或断裂系。平面上,主要断裂系呈北东或北北东向的,其次是北西向、东西向或北西西向;剖面上,形成了简单犁形、Y字型、复合Y字型、羽状、马尾状及断阶状等9种断裂组合样式。而断裂组合样式又控制了盆地的构造-地质结构样式,即江汉盆地主要有简单半地堑式、简单型的半地堑复合结构、复杂型半地堑复合式、复合地堑结构4种构造-地质结构样式。

Controlled and influenced by the tectonism occurred in the periphery, there formed two major basement fault systems in the southern and northern parts of Jianghan Basin, which controlled and influenced the development of Cretaceous-Neogene faults, and led to the formation of the extensional, compressional and strike-slip faults or fault systems with multi-directions and different sizes.The major fault systems are mainly N-E-or NNE-trending, and secondarily NW-, WE-or NWW-trending; vertically, 9 fault assemblages arranged in the styles of simple listric, Y-shaped, combined Y-shaped, pinnate, horsetail and faulted terrace and so on.These fault assemblage styles, in turn, controlled the tectonic-geological framework styles in Jianghan Basin, including simple half graben, simple-half composite structure, complex half-graben composite structure and composite graben structure.