川藏公路帕隆藏布段沿线第四纪堆积体的成因及其分布规律  

Genesis of the Quaternary accumulations along the Palong section of the Sichuan-Tibet Highway and Their Distribution Regularities

作　　者：袁广祥[1] 丁仁伟[1] 尚彦军[2] 曾庆利[3] 

机构地区：[1]华北水利水电学院资源与环境学院,河南郑州450011 [2]中国科学院地质与地球物理研究所,北京100029 [3]中国科学院研究生院,北京100049

出　　处：《地质与勘探》2012年第1期170-176,共7页Geology and Exploration

基　　金：国家自然科学基金项目(编号:40972199);华北水利水电学院高层次人才科研启动项目(编号:200919)资助

摘　　要：川藏公路帕隆藏布段位于雅鲁藏布江的一级支流帕隆藏布流域,沿帕隆藏布及其支流修建,穿越了多种成因类型的堆积体。通过对该地区的调查,对这些堆积体的成因类型及分布规律进行分析。第四纪以来,青藏高原发育的多次冰川活动,使帕隆藏布流域保留了第四纪古冰川作用遗留下来的古冰碛。在帕隆藏布主河谷及其支流河谷中广泛分布着河流搬运沉积的堆积,在宽谷地段尤为明显。由于帕隆藏布流域地质灾害发育,形成了数量众多、规模巨大的地质灾害二次堆积体,包括泥石流堆积体、崩塌滑坡堆积体、雪崩堆积体以及碎屑流堆积体。The Palong section of the Sichuan-Tibet highway is located north of the eastern Himalayan structural junction, along the Palong Rivet＇ and its tributaries. It crosses through accumulations of various genesis. This paper is based on investigation to areas around this section to research the mechanism of these accumulations and their distribution regularities. Because of many times of glacial movements in the region since the Quaternary period, lots of ancient moraine deposits were preserved along the Palong River. The moraine deposits were made in Penultimate Glaciation, Last Glaciation, Neoglacia- tion and Little Ice Age, respectively. At the same time, lots of alluvial deposit can be fnund along the river and its tributaries, especially in basins, such as the Songzong basin, the Mimei basin, and the Dongjiu basin. Because of frequent geologic hazards, many types of loose accumulations were produced ahong the highway, such as debris flow, collapse, landslide, and snow avalanche.

关 键 词：川藏公路 松散堆积体 分布规律 

分 类 号：P642.4[天文地球—工程地质学]