甘肃省地貌分区研究

GEOMORPHOLOGIC ZONE OF GANSU PROVINCE

地貌分区是地质环境研究工作中的重要内容,也是区域自然资源开发、国土空间规划、地质环境保护和经济开发区划中的基础性条件。甘肃省处于黄土高原、内蒙古高原和青藏高原交汇地带,地域辽阔狭长,地貌形态多样,山地、平原、盆地、高原、河谷、沙漠、戈壁相间分布。根据甘肃省地质环境图系编制工作中对地貌分区的研究,以构造地貌为基础、内外营力相结合和成因—形态相结合的原则,通过对地貌形成的构造基础、地貌形态特征、成因类型分析,将甘肃省地貌区划分为北山—龙首山山地、河西走廊平原、阿尔金山—祁连山山地、陇西陇东黄土高原和阿尼玛卿山—西秦岭山地5个一级地貌区;根据一级地貌区地貌单元跨度大、地貌形态多样的特点,进一步划分为14个二级地貌区;二级地貌区内根据地貌的成因类型和形态特征进一步划分为42个三级地貌区。

Geomorphologic zoning is an important part of geological environmental research,and it is also a basic condition for the development of regional natural resources,territorial spatial planning,geological environmental protection and economic development zoning.The shape of Gansu is vast,narrow and long,with which complex topography and diverse landforms,it is located in the convergence zone of the Loess Plateau,the Inner Mongolia plateau and the Qinghai Tibet Plateau,where the distribution of mountains,plains,basins,plateau,valleys,deserts and Gobi is interspecific.Based on the compilation of the Quaternary geological map of the geological environment map of Gansu Province,the study of geomorphologic zoning is carried out.It is based on the tectonic landform,taking into account both internal and external forces and genetic forms.Through the analysis of the structural basis,morphological characteristics and the genesis,we divide Gansu into five first-class geomorphic regions:Beishan-Longshoushan Mountains,Hexi Corridor Plain,Altun-Qilian Mountains,Longxi-Longdong Loess Plateau and Animaqingshan-West Qinling Mountains.According to the characteristics of large span of geomorphic units and diversity of geomorphic morphology,the first-class geomorphic area is further divided into 14 second-class areas.Then,further based on the genesis and morphological characteristics,dividing them into 42 sub-geomorphic areas.Finally,based on the geomorphic zoning,the geomorphological features of each area are briefly discussed.