The thick-bedded and continuous karst crust only formed in the old stage of geomorphic development. The corresponding landscape is the karst planation surface. The karst planation surface consists of the loose weather...The thick-bedded and continuous karst crust only formed in the old stage of geomorphic development. The corresponding landscape is the karst planation surface. The karst planation surface consists of the loose weathering crust and the base weathering front below the crust. Its profile structure is similar to 'double surface of leveling' model built by Budel. In the limestone area, the base weathering front is the covered karst. From the Tibet Plateau to Yun-Gui (Yunnan- Guizhou) plateau and Xiang-Gui (Hunan-Guangxi) hills, the covered karst is concomitant with the red weathering crust; all of them are the component of the double-level surfaces of karst planation. But, they belong to the different disintegration stages of planation surface. The different subtypes of the covered karst and the red weathering crust indicate the existence of karst planation surface. Thus, they can be made as a reference system when the rising degree and the rising rate of the Tibet Plateau are discussed.展开更多
基金This Project was supported by Research Project of the Tibet Plateau from Chinese Academy ofSciences (Grant Nos. KZ951-A1-204 KZ95T-06) the Key Foundation of National liasic Researches of China (Grant No. G1998040800).
文摘The thick-bedded and continuous karst crust only formed in the old stage of geomorphic development. The corresponding landscape is the karst planation surface. The karst planation surface consists of the loose weathering crust and the base weathering front below the crust. Its profile structure is similar to 'double surface of leveling' model built by Budel. In the limestone area, the base weathering front is the covered karst. From the Tibet Plateau to Yun-Gui (Yunnan- Guizhou) plateau and Xiang-Gui (Hunan-Guangxi) hills, the covered karst is concomitant with the red weathering crust; all of them are the component of the double-level surfaces of karst planation. But, they belong to the different disintegration stages of planation surface. The different subtypes of the covered karst and the red weathering crust indicate the existence of karst planation surface. Thus, they can be made as a reference system when the rising degree and the rising rate of the Tibet Plateau are discussed.
