摘要
拉斯曼丘陵区风化过程微弱、初始,沉积物地球化学指数与母岩高度相似。沉积物搬运距离短,且风力的混合扰动作用强烈,沉积颗粒级配过程、粒度参数、化学组份均反映这一特征。丘陵西部沉积物保存较好,东部区则受外力明显的改造。各类沉积物10mm以下颗粒均值(M_2(φ))介于中砂到粗砂范围内;分选差,样品标准差δ多集中在2.0附近;随着M_z(φ)的增大,频率曲线变尖陡,型式愈近正态分布曲线;同时,δ也随M_2(φ)的增大而升高。各类沉积物中均含少量的悬浮物,含量介于5—10%之间。
Larsemann Hills,sedimentary characteristicsAbstract The weaqthering processes are very weak and original on the hills,The geochemical in-dexes of sedmients and rocks are very similar. Sediments were transported in a short dis-tance,and were mixed with,the aeolian deposits. This fact has been confirmed by grain-size distributions,grain-size parameters and geochemical compositions. The sediments on the westhills still remains an original condition,and the sediments on the east hills have been trans-formed obviously.The sediments with the mean diameters less than 10mm are middle sizesands and coarse sands.The suspended grains are very small which make up only up only 5-10%.
出处
《地理研究》
CSSCI
CSCD
北大核心
1994年第4期8-18,共11页
Geographical Research
基金
国家海洋局南极办公室
中科院地理所所长基金