祁连山东南缘基于RGMAP的数字化地貌研究

顾延生; 张旺生; 朱云海; 樊光明; 高山

祁连山东南缘基于RGMAP的数字化地貌研究

顾延生^{1, 2,},
张旺生¹,
朱云海¹,
樊光明¹,
高山¹

1.
中国地质大学地球科学学院, 湖北武汉 430074
2.
武汉大学人文科学学院, 湖北武汉 430072

基金项目:

中国地质调查局“青海1∶25万民和县幅数字填图项目” 200213000016

“数字填图过程、多元数据整合及成果表达方式研究” 基[2003]009- 02

详细信息

作者简介:
顾延生(1970-), 男, 讲师, 主要从事地貌第四纪地质与环境研究. E-mail: ysgu@cug.edu.cn

中图分类号: P931
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出版历程
- 收稿日期: 2003-04-18
- 刊出日期: 2003-07-25

Preliminary Digital Geomorphologic Research on Southeastern Margin of Qilian Mountains Based on RGMAP

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
School of Humanity, Wuhan University, Wuhan 430072, China

摘要

摘要: 在RGMAP平台下, 以数字高程模型DEM为基础, 结合野外路线调查、图切构造地貌剖面, 较系统地研究了青藏高原东北缘祁连山东南麓(达坂山—拉脊山) 地区典型层状地貌分布发育特征, 初步识别出了调查区的两级夷平面(一级夷平面海拔3000m、二级夷平面4000m左右)、多级山足剥蚀面(1~ 11级) 及主要入海水系如黄河及其支流, 如湟水河、大通河发育的河流阶地系列, 其中湟水河发育7级河流阶地, 黄河5级河流阶地, 黄河干流于盐锅峡段贯通之前, 湟水河一度为黄河上游源头.结合野外调查和室内分析, 本文详细描述了各级层状地貌分布特征、沉积学、形成时代及其与新构造运动的关联, 说明典型层状地貌的发育是青藏高原晚新生代以来间歇性构造抬升的结果.
- 数字高程模型 /
- 典型层状地貌 /
- 夷平面 /
- 剥蚀面 /
- 阶地
Abstract: The typical stratified landforms in the southeastern margin of the Qilian Mountains have been recognized and studied in detail on the basis of digital elevation model, field survey and tectonic- geomorphologic section as well as the indoor study with the support of the operation system of regional digital geological survey and field mapping (RGMAP). There are two stages of planation surfaces (P_I3 000 m, P_II4 000 m), eleven stages of pediments (Pe_1-11) and seven terraces (T₀-T₆) of the Huangshui River. Five terraces are developed in the Yellow River from the Yanguoxia to Bapanxia. Before the Yellow River mainstream passed through the Yanguoxia about 0.15 Ma, the Huangshui River used to be its upper reach. Combined with field survey and analyses indoors, every stages of stratified landforms (planation surfaces, pediments and terraces) are recognized, showing detailed features of distribution, sedimentary and formation ages and relation with neo-tectonic movements. This demonstrates that development of typical stratified landforms resulted from phased uplift of the Qinghai-Xizang plateau in Late Cenozoic.
- digital elevation model /
- typical stratified landform /
- planation surface /
- pediment /
- terrace

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图 1 南祁连拉脊山—中祁连达坂山构造地貌

Fig. 1. Tectonic and geomorphological section from Lajishan to Dabanshan

下载: 全尺寸图片幻灯片

图 2 祁连山东南缘基于DEM分析地貌

1.古夷平面区; 2.主夷平面区; 3.山足剥夷面区; 4.黄河及其支流阶地区; 5.二级夷平面; 6.一级夷平面; 7.一至十一级剥夷面; 8.湟水河床一至六级裂点; 9.庄浪河床一至九级裂点; 10大通河床一至二级裂点; 11.一至六级河流阶地; 12.图切构造地貌剖面

Fig. 2. Geomorphological map of southeastern margin of Qilian Mountain based on DEM

下载: 全尺寸图片幻灯片

图 3 湟水河兰州红古段河流阶地

1.砂砾石层; 2.马兰组黄土; 3.离石组黄土; 4.午城组黄土

Fig. 3. Terraces of Huangshui River at Honggu County of Lanzhou

下载: 全尺寸图片幻灯片

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