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北江和西江一级阶地的组成物质以上更新统为主.按地貌与沉积物的相关关系,本文对沿江第四系分层提出了若干见解.一级阶地的沿程变形,北江可分为超河漫滩阶地、半埋藏阶地和埋藏阶地三段;西江分为半埋藏阶地与埋藏阶地两段.晚更新世以来瑶山以西的坪石河段地壳上升为主;以东的乐昌河段直至珠江三角洲,在晚更新世下沉为主;自全新世以来及今后的地动趋势,韶关以北上升为主,以南下沉为主.晚更新世以来瑶山经向构造带和三连一韶关纬向断裂是活动构造带,而其它构造带没有明显活动.珠江三角洲的埋藏阶地是构造下沉和玉木冰后期海面上升共同造成的.
Based on the correlation between topography and sediments, this paper put forward some opinions on the stratification of the Quaternary of the Yangtze River.When the deformation of the first terrace, the North River can be divided into ultra-Pleistocene River floodplain terraces, semi-buried terraces and buried terraces. The Xijiang River is divided into two sections of semi-buried terraces and buried terraces. Since the Late Pleistocene, the crustal rise of Pingshihe Section west of Dayaoshan Mountain has been dominated. From the east of Lechang reach up to the Pearl River Delta, And mainly subsided in the late Pleistocene. Since the Holocene and in the future, the trend of earth movement has mainly risen to the north of Shaoguan and subsidence to the south. Since the Late Pleistocene, the Yao-Shan-Jing tectonic belt and the three-in-one Shaoguan latitudinal Faults are active tectonic belts, while other tectonic belts have no obvious activities.The buried terraces in the Pearl River Delta are caused by the tectonic subsidence and the rising sea level at the later tamarind ice.