摘要
万州特有的阶梯状地貌特征是万州地区河流地貌演化及水平地层特殊地质环境共同作用的结果,通过系统的野外地质调查、勘探和资料收集,结合2008年堰塘的湖中钻探,对该堰塘沉积物进行系统取样与分析,并进行了沉积物年龄与成分的测定.结果表明山湾陡崖的崩塌与阶地抬升及区域构造运动一致.绘制了山湾滑坡崩塌堆积物各期次沉积剖面,共分为10个崩塌旋回.结合沉积物测年,研究了山湾滑坡体沉积物沉积速率,得出了山湾危岩陡崖后退速率为0.31～0.37m/ka.
The interaction of fluvial geomorphology evolution and special geological environment in horizontal formation in Wanzhou district resulted in its unique stepladder geomorphic feature.Based on a systematic field investigation,exploration and data collection,combining with the drilling at Shanwan pond in 2008,we conducted a comprehensive study of its sediment for the first time,systematically collecting sediment samples,doing analysis to determine its age and composition.It shows the consistency of Shanwan cliff collapse and the regional tectonism.The sediment profile of Shanwan landslide collapse deposit at each stage is presented and it is divided into 10 cycles of failure.Combining with the sediment dating,the deposition rate of Shanwan landslide sediment is researched,and the recession rate of Shanwan cliff is proposed as 0.31-0.37 m/ka.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
2010年第6期1069-1074,共6页
Earth Science-Journal of China University of Geosciences
基金
国家自然科学基金项目(No.40872176)
关键词
近水平地层
沉积速率
陡崖
后退速率
沉积物
工程地质
nearly horizontal formation； deposition rate； cliff； recession rate； sediments； engineering geology；
