北京潭柘寺地区第四纪冰川遗迹的宏观和微观特征

以北京西山潭柘寺地区第四纪冰种遗迹的宏观特征研究为基础,对管坨岭冰期和赵家台冰期的古冰川学积进行了石英颗粒表面结构形貌组合特征的分析,结果表明,管坨岭冰期的管坨岭碛层和大富庄冰碛层,以及赵家台冰期的太平庄冰碛层中石英颗粒表面结构,以冰川成因的形貌组合占优势,而赵家台冰期鲁家滩冰水沉积中的石英颗粒表面结构,则以冰川和流水共有成因的形貌占优势,所以,据冰川遗迹的宏观和微观特征,可以肯定该区分别在早更新

MACROSCOPIC AND MICROSCOPIC FEATURES OF THE QUATERNARY GLACIAL VESTIGES IN THE TANZHESI AREA OF THE WESTERN HILLS OF BEIJING

After a study of macroscopic features for the Quaternary glacial vestiges in the Tanzhesi area of the Western Hills of Beijing,the analysis of the appearances and assemblage features of quartz grain surface textures has been carried out for the palaeoglacial deposits of the Guantuoling and Zhaojiatai glaciations.The surface textures of quartz grains indicate a dominance of the appearance assemblage of glacial origin in the Guantuoling till and Dafuzhuang till of the Guantuoling glacial stage as well as in the Tainpingzhuang till of the Zhaojiatai glaciation,and glaciofluvial origin for the Lujiatan deposit of Zhaojiatai glaciation.Therefore,based on the macroscopic and micrioscopic features of the palaeoglacial vestiges in this area,it is certain that two palaeoglaciations had developed in the Early and Middle Pleistocene respectively.