基于DEM数据的云南省澜沧县夷平面提取及其地质意义  

Planation Surface Extraction and its Geological Significance Based on DEM Data in Lancang County,Yunnan Province

作　　者：金文正[1,2] JIN Wenzheng(School of Energy Resources,China University of Geosciences,Beijing 100083;Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism,Ministry of Education,Beijing 100083)

机构地区：[1]中国地质大学(北京)能源学院,北京1000832 [2]海相储层演化与油气富集机理教育部重点实验室,北京100083

出　　处：《四川地质学报》2024年第4期734-738,共5页Acta Geologica Sichuan

基　　金：云南省科技计划项目“云南省中深层地热能探测开发关键技术研究”(编号:202302AF080001);国家自然科学基金项目“龙门山冲断带构造分段变形机制研究”’(编号:41002072)。

摘　　要：云南省澜沧县所在的滇西地区位于多个构造板块的拼合部位,构造变形强烈且构造演化复杂,为定量分析该县内新构造运动的变形和演化结果,通过ArcGIS软件对该县域DEM数据体进行了不同地貌因子的求取和分析,获得了澜沧县夷平面。结果表明:澜沧县域内80%以上面积海拔介于1 000~3 500 m之间,属于中海拔地区;斜坡区所占比例为52.82%,陡坡区所占比例为36.82%;小起伏山地占比70.47%、中起伏山地占比17.54%、丘陵占比10.38%;根据夷平面海拔、地表坡度和地势起伏度等地貌参数,确定在夷平面所在海拔位置坡度低于15°且地势起伏度小于500 m的平面范围,识别和求取了4级夷平面,一级夷平面至四级夷平面形成时间依次变晚,且海拔依次降低,分别为1 856 m、1 626 m、1 301 m和1 125 m,一级和二级夷平面被后期构造改造严重且残存面积小,受北西向大型走滑断裂带影响明显,主要分布于中部及东北部,三级和四级夷平面则主要受控于次级断裂,主要分布于澜沧县西南部。The Lancang County is located in the western Yunnan region,where is the convergence of several tectonic plates,and the tectonic deformation is strong and the tectonic evolution is complex.In order to quantitatively analyze the deformation and evolution results of neotectonic movement in this county,ArcGIS software was used to obtain and analyze different geomorphic factors on the DEM data of this county,and the planation surface of Lancang County was obtained.The results show that more than 80% of the area in Lancang County is between 1 000 ~ 3 500 m above sea level,which belongs to the middle altitude area.The proportion of slope area is 52.82%,and the proportion of steep slope area is 36.82%.The proportion of small rolling mountains is 70.47%,the proportion of medium rolling mountains is 17.54%,and the proportion of hills is 10.38%.According to geomorphic parameters such as planation surface elevation,surface slope and topographic relief,the plane range with slope lower than 15° and topographic relief less than 500 m at the elevation of planation surface is determined,and four grade planation surfaces are identified and obtained.The formation time of first grade planation surface to fourth grade planation surface becomes later and the elevation decreases in turn.They are 1 856 m,1 626 m,1 301 m and 1 125 m respectively.The first and second grade planation planes were heavily modified by late tectonic processes and their remaining areas were small,and they were obviously affected by large strike-slip fault zones along the northwest direction,mainly distributed in the central and northeastern parts of the country.The third and fourth grade planation planes were mainly controlled by secondary faults,mainly distributed in the southwest of Lancang County.

关 键 词：海拔 地貌 夷平面 新构造运动 澜沧县 滇西 

分 类 号：P546[天文地球—构造地质学]