贡嘎山海螺沟冰川沉积特征与冰下过程研究  

Sedimentary Characteristics and Subglacial Processes of the Glacial Deposits in Hailuogou Glacier,Gongga Mountain

作　　者：刘耕年[1] 张跃[1] 傅海荣[1] 陈艺鑫[1] 石磊[1] 

机构地区：[1]北京大学城市与环境学院,北京100871

出　　处：《冰川冻土》2009年第1期68-74,共7页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(40571014);国家重点基础研究发展计划(973计划)项目(2005CB422001)资助

摘　　要：贡嘎山海螺沟冰川是典型的海洋性冰川,粒度分析表明:冰下融出碛的细粒组分中粉砂占优势,压碎组分与磨碎组分界线在0.5 mm附近,说明其经历充分的研磨细化.与西藏枪勇冰川和天山乌鲁木齐河源冰川的矿物组成和化学成分对比,海螺沟冰川沉积物的经历的化学风化作用更强,即海洋性冰川冰下化学作用比大陆性冰川活跃.显微层理构造、正粒序层理和沉积透镜体反映海洋性冰川底部存在周期性沉积机制和明显的流水作用,显微滞碛是较常见的冰下融出碛类型.沉积物中显微褶皱和断层等反映海洋性冰川强烈滑动、剪切变形过程机制.The Hailuogou Glacier is a typical maritime type one,and is one of the highly investigated by geoscientist.Based on the analysis of grain size,mineral composition,chemical composition,and sedimentary micro-structures of the glacial deposits of Hailuogou Glacier,the sedimentary characteristics and subglacial chemical-physical processes of maritime type glacier are discussed in this paper.Grain size analysis indicates that the silt is the predominant component in the subglacial deposits,which show strong abra...

关 键 词：海螺沟 冰川沉积 冰下过程 

分 类 号：P343.6[天文地球—水文科学]