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兰州丹霞地貌成因分析

发表时间:2009-11-15  浏览量:1508  下载量:717
全部作者: 马向贤,梁收运,梁晓波,王群敏,李晓,王宇
作者单位: 西部灾害与环境力学教育部重点实验室,兰州大学土木工程与力学学院
摘 要: 通过野外考察、室内矿物成分鉴定和颗分试验,系统分析了丹霞地貌垂直节理发育情况和区域断层活动情况,结果表明:兰州丹霞地貌主要发育在新生代(E2x,E3y)红色砂砾岩层中,砂砾岩主要矿物成分为方解石、长石和石英,粒度大小主要集中在-1 Ф~4 Ф. 在新构造运动中,该区经历了流水下切和间歇式上升过程,厚层新生代沉积物变成了海拔1 400~2 000 m的山体。新生代红色砂砾岩在经历了风化搬运、垂直节理发育、再风化剥蚀和搬运后,同时受岩性本身(砂岩与砾岩)的影响,差异性风化剥蚀显著,因此形成了柱廊状、宫殿及蘑菇状等丹霞地貌景观。
关 键 词: 自然地理学;地貌学;丹霞地貌;成因分析;兰州市
Title: Genetic analysis of Danxia landform in Lanzhou
Author: MA Xiangxian, LIANG Shouyun, LIANG Xiaobo, WANG Qunmin, LI Xiao, WANG Yu
Organization: Key Laboratory of Mechanics on Western Disaster and Environment of the Ministry of Education, School of Civil Engineering and Mechanics, Lanzhou University
Abstract: Through field study, indoor mineral component identification and sieve analysis, the paper systematically analyzes the Danxia landform vertical joint growth situation and the regional fault activity situation. The results show that the Danxia landform mainly developed in the red glutenite bed of the Cenozoic (E2x,E3y). The main mineral components of glutenite include calcite, feldspar and quartz, with grain size mainly in -1Ф~4Ф. This district experienced fluvial incision and discontinuous bulge processes in the new tectonic movement, during which the thick Cenozoic sediments grew into a hill body 1 400~2 000 meters above the sea level. The red glutenite had experienced weathering and transportation, vertical joints development, and re-weathering denudation and transportation; meanwhile, it was affected by the lithological characteristics of sandstone and conglomerate in components and structures, so the differentiated weathering denudation became quite obvious. In this way, the Danxia landform landscapes with the shapes of colonnades, palaces, mushrooms and so on have taken shape.
Key words: physical geography; geomorphology; Danxia landform; genesis analysis; Lanzhou city
发表期数: 2009年11月第21期
引用格式: 马向贤,梁收运,梁晓波,等. 兰州丹霞地貌成因分析[J]. 中国科技论文在线精品论文,2009,2(21):2306-2312.
 
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