滦河以北海岸风成砂沉积的初步研究

本文根据1977-1982,1985年滦河以北沿岸的钻探和天然剖面调查资料,分析研究该区沙丘的类型和特征,风沙沉积的地层层位、沉积特征及沉积过程,认为海岸主沙丘是由陆向海和由岸向海运动的两组沙丘相遇而成,其上又生成新的沙丘。根据¹⁴C测年资料,初步确定该区风成沙丘开始形成的时代,并研究风成沙与河流沙、海滩沙的主要区别及海岸和内陆风成沙沉积的辨认依据。

Study on Coastal Sand Sedimentation at the North Bank of Luanhu River

By analysing drill logs along the north bank of Luanhe River and ground observations in 1977-1982 and in 1985, the duneforms and their features, the stratigraphic succession of sand sidements, the sedimental characteristics and the sedimental processses on the north bank of Luanhe River are presented and discussed. It is believed that the dominant dunes on the north bank of Luanhe River are composed of the two groups of dunes one is 1) moving from land to river bank and the other is 2) encroaching from river bank to river. On the dominant dunes, new second dunes are formed. By3C dating, the age of aeolian sand dunes has been determined and the major distinctions between aeolian sands, lacustrine sand and seabeach sands are made. The evidemces for interpretering deepfdeposits of continintal aeolian and coastal aeolian sand have been presented.