鄂东南多层次滑脱拆离及其与桐柏-大别山滑脱拆离的对接关系

江汉盆地南北分别耸峙着幕阜山和桐柏—大别山。两大山脉均由前震旦系为核以震旦系、古生界、中新生界为翼组成复式背斜。两大复式背斜均以多层次滑脱拆离为特色。幕阜山北侧鄂东南构造自南而北,桐柏—大别山南侧构造自北而南向着江汉盆地滑移,并于江汉盆地对接。幕阜山复式背斜北翼的滑脱拆离构造平面上分为后缘拉伸带、中部滑脱带、前缘挤压带。对接带东段呈北西向,西段呈近东西向;东段以逆冲断层的对冲式对接,西段以褶皱式对接。表层拆离主要原因是重力滑动,基底拆离的原因仍待探讨。滑脱拆离发生于印支—燕山期。印支—燕山期的褶皱作用、山脉隆起、区域拆离滑动是相继而统一的过程,并与伸展作用密切相关。

MULTILEVEL GLIDING DETACHMENT IN SOUTHEAST HUBEI AND ITS CONVERGENCE-CONNEXION RELATIONSHIP WITH MULTILEVEL GLIDING DETACHMENT OF TONGBAI-DABIE MOUNTAIN

The Mufushan is situated on the south border of Jianghan basin,and Tongbai-Dabie mountain on the north border of Jianghan basin. The architecture of the two mountains is anticlinorium, which consists of Proterozoic-Archean as core, and Palaeozoic and Mesozoic as limbs. The structures of them are characterized by the multilevel gliding detachment and thrust. The structures of Mufushan thrust or slided from south to north, directed toward Jianghan basin, the structures of Tongbai-Dabie mountain thrust or slided from north to. south, directed toward the Jianghan basin too. Therefore, thrust-nappes or gliding-sheefs of the two opposite mountains converged and counterconnected each other in the Jianghan basin.