多旋回構(gòu)造運動說

1 概述燕山水庫位于河南葉縣保安鎮(zhèn)東約10km的甘江河上,是治淮工作中的一項重點工程,設(shè)計最大壩高45.5m,壩型為粘土心墻壩,主壩全長5130m,總庫容初擬23.8億m3,為防洪、灌溉、發(fā)電和南水北調(diào)中線工程調(diào)節(jié)之綜合蓄水工程。2 新構(gòu)造運動跡象燕山水庫大地構(gòu)造單元上位于華北準(zhǔn)地臺與祁秦褶皺系兩大構(gòu)造單元的交接部位。自燕山運動晚期開始該區(qū)發(fā)生東

Present granite landform characteristics and distribution are the integrated result of climate, tectonics and lithology. Various types of granite landforms in China signify climate zonality and differential vertical movement of earth surface, while published research results on Chinese granite landforms are very rare, especially in international journals. Based on the process analysis of chemical weathering and physical disintegration, four granite landform regions in China are classified according to the present climate regime. On the Tibetan Plateau, the cold and freezing climate induced periglacial landscapes; the northeast region is characterized by physical disintegration and low round mounds are widespread; in the northwest region controlled by arid climate, wind-carved minor landscapes are extremely prominent. The most spectacular granite landscapes in China are presented in southeast as a result of longtime chemical weathering under humid and warm conditions, as well as the differential uplift after Neogene. Correlating the weathering crust in southern China, Tibetan Plateau and India, a possible unified planation surface in Neogene is proposed. With corestones as indicators of original weathering front, the differential uplift extent of dissected planation surfaces can be estimated. At least three landforms implying uplift can be identified in southeastern China, with elevations of 300–400 m, 2000 m and 3600 m above the sea level respectively.