【摘要】 <正> 从李四光创立我国第四纪冰川学说以来,至今半个世纪,在中国东部仍然存在着有无冰川和冰川作用次数与规模大小之争。皆因何谓冰川沉积?它有哪些特殊标志尚未能统一认识。我们想以西部高山及邻近地区冰碛与非冰川沉积为例,从砾石与碎屑矿物表面形态人手,研究其砾石表面形态和碎屑矿物在显微镜和扫描电镜下的表面微结构等特征。希望和从事冰川地质、地貌及第四纪沉积研究的同志们一起把这项工作向前推进。更多还原

【Abstract】 This paper introduces the surface forms of gravels and the textures of minerals in tills and non-tills from microscopic and scanning electro microscopic studies. Their characteristics are innate in themselves, but sometimes they are similar to one another. Glacial stria forms groups on a surface, and sometimes they cross each other. Glacial stria are deep and smooth, while those of mud flow are often shallow, small, irregular, and not in the same direction. Pressure erosion concave holes on glacial gravel surface are smooth at the edge of the holes, but struck concave holes on the sand surface of mud flow, alluvial and diluvial, are rough. Chemical corrosion concave holes have corrosive marks. On the glacial quartz sand surface there are deformed curving cleavage plates formed by glacial pressure but on others of pseudo-till often broken cleavage plates, conchoidal fractures and many mechanical v- shaped depressions are found.更多还原