摘要
论述了用河流阶地冲积层相当于古河流平水期水面的样品年龄及该采样点至今日河流平水期水面的相对高度求得地壳上升速度,再由地壳上升速度及丹霞地貌的相对高度求得地貌年龄,由地貌年龄及陡崖谷地上缘的宽度求得岩壁后退速度,由地貌年龄及被蚀去的地貌体积求得侵蚀速度,这是地貌学由定性描述向定量研究的一次尝试。
Fluvial deposits on the palaeo-fluvial terraces of Danxia landform areas were dated by using TL technique. Tectonic uplift rates were obtained by dividing the heights of the paIaeo-fluvial terraces above current average water level. The geomorphic ages were then calculated from the tectonic uplift rates and the relative heights of Danxia strata. The cliff retreating rates were deduced from the geomorphic ages and the cliff valley width. Finally the continent erosional rates were estimated by surveying the sediment volume that had been eroded out with the geomorphic ages. This study is a new attempt in geomorphology to step from qualitative description to quantitative determination of earth surface landform processes.
出处
《热带地理》
2004年第2期127-130,共4页
Tropical Geography
基金
国家自然科学基金资助项目(48970006)
关键词
丹霞地貌
河流阶地
地壳上升速度
地貌年龄
岩壁后退速度
侵蚀速度
Danxia landforms
Fluvial terraces
Tectonic uplift rates
Geomorphic ages
Cliff retreating rates
Erosional rates
