贵州高原层状地貌与高原抬升

STEP-LIKE LANDFORMS AND UPLIFT OF GUIZHOU PLATEAU

各种层状地貌是地貌演化研究的重要对象,它们记录了区域地貌、地质、环境及气候变化等地球内外动力的演变。深入研究贵州高原的各种层状地貌的形成、变形及时代,可以弥补缺乏沉积记录等代用指标的不足,具有重建贵州新生代地质、环境演化历史的重大意义。文章总结了有关贵州夷平面、河流阶地、洞穴等各种层状地貌等零星的研究情况,对相关问题进行思考和讨论,旨在构筑贵州新生代区域构造抬升、地质环境演化基本轮廓;与此同时,依据贵州喀斯特的特殊性,提出各级地貌面上碳酸盐岩风化壳的综合对比以及年代学研究是深化贵州层状地貌和新生代地质、环境演化研究的重要内容。

Planation surface, fluvial terrace, multiplayer karst caves and other step-like geomorphic surfaces on the Guizhou Plateau were formed by long term planation and erosion, which recorded geologic, geomorphic and paleo-environmental history of the Guizhou Plateau. Therefore, studies on the features, formation, distortion and ages are very important to reconstruct ages and amplitudes of the Guizhou Plateau, whose Cenozoic evolution history is unclear because of the lack of sedimentation records. In this paper, much fragmentary information about planation surface, fluvial terrace, and multiplayer karst caves of Guizhou are collected, with an attempt to reconstruct the Cenozoic evolution history of the Guizhou Plateau. Meanwhile, some related problems urgently to be solved are put forward, such as the ages and distortion history of step-like geomorphic surfaces. In the karst regions of Guizhou, the red weathering crusts of carbonate rocks widespread on the step-like geomorphic surfaces may bear critical information about their evolution history. That is to say, much attention should be paid to the degree of weathering and ages of the red crusts of carbonate rocks overlying the step-like geomorphic surfaces in forth coming research.