庐山更新世冰碛与相关沉积的新发现及微结构的研究  

ON THE NEWLY DISCOVERED PLEISTOCENE TILL AND RELATED DEPOSITS IN Mt.LUSHAN AND THEIR MICROSTRUCTURE

作　　者：潘建英[1] 

机构地区：[1]中国地质科学院地质力学研究所

出　　处：《地质力学学报》1989年第2期45-60,共16页Journal of Geomechanics

摘　　要：庐山白石嘴附近新发现的冰碛灰白色泥砾层、冰前沉积砂砾粘土层以及表皮构造、冰溜面、冰川巨漂砾等,为研究庐山第四纪冰川作用的性质、类型和冰期气候变化提供了新的证据。运用扫描电镜对沉积石英颗粒表面微结构的系统研究表明,微结构类型的组合,具有冰期寒冷环境的冰碛相、冰水沉积相及间冰期湿热环境的溶蚀沉积等多种结构组合特征。庐山有第四纪冰川活动无容置疑。A great deal of till and related deposits are distributed both at the piedment and in the moun- tains of Lushan.Since the publication of“Quaternary glaciation in the Lushan Area,Central Chi- na”by Prof.Li Siguang in 1937,more knowledge of the Quaternary glaciation in the area and of the related deposits has been gained.However,a debate of the existence of the Quaternary glacia- tion in the Lushan area is still in progress. In recent years,a special study of the Quaternary deposits in Mt.Lushan has been carried on by the author.An exposure section of glacial deposits was found from Xiaqingshan to Yemaojin and Jiangpochang of Baishizui.These deposits bear the characteristic features of the transportation and deposition by glacier,glacial fluvial water and freeze-thaw.A study of the quartz sands and clay minerals using scanning electrern microscope brought out to light the various structure assem- blages of the surface of quartz grains and the different clay mineral species e.g.fresh conchoidai fractures,parallel steps,upturned cleavage plates,striaes and pressure fractures on the surface of the quartz sands in the white till.The clay minerals are mostly illites suggesting cold climate.All these provide important evidence for glaciation in this area.

关 键 词：泥砾 第四纪冰川 冰水沉积 表皮构造 冰川槽谷 冰期气候 石英颗粒 贝壳状断口 表面微结构 冰流 

分 类 号：P55[天文地球—构造地质学]