基于DEM的南岭东段离子吸附型稀土矿成矿地貌条件分析

发布时间：2018-01-27 06:10

本文关键词： DEM南岭东段离子吸附型稀土矿成矿地貌地貌因子值　出处：《地球学报》2016年02期 　论文类型：期刊论文

【摘要】：稀土是我国重要的战略资源,而离子吸附型稀土矿是我国的特色矿产,占据着重要的地位。离子吸附型矿产的形成与否,与风化壳密切相关,而风化壳的发育及保存与微地貌等特征密切相关。本文旨在利用DEM技术,结合搜集到稀土矿点及矿区数据,对含有稀土的地貌单元进行地形因子定量分析,以总结风化壳离子吸附型稀土矿的成矿地貌条件。借助GIS技术,利用DEM提取高程、坡度、坡向、曲率、地形起伏度、地表切割深度、地形特征等各类地貌因子值,并与南岭东段的成矿矿点及矿区进行叠加分析,统计计算矿点及矿区所处位置的地貌因子值,进而探讨风化壳型稀土资源赋存的有利地形地貌环境。结果显示,最佳成矿有利地貌为高程150~500 m、坡度0°~20°、地形起伏度100~400 m、地表切割深度40~150 m、地形特征为山顶或山脊;研究结果有望指导南岭东段离子吸附型稀土矿找矿勘查工作。
[Abstract]:Rare earth is an important strategic resource in China, and ion adsorbed rare earth ore is a characteristic mineral in China, which occupies an important position. The formation or not of ion adsorption mineral is closely related to weathering crust. The development and preservation of weathering crust are closely related to the characteristics of microgeomorphology. The purpose of this paper is to make quantitative analysis of landform factors of landform units containing rare earths by using DEM technology and combining with the data of rare earth ore spots and mining areas. In order to summarize the ore-forming geomorphological conditions of weathered crust ion adsorbed rare earth ore, the elevation, slope, slope direction, curvature, topographic fluctuation and surface cutting depth were extracted by DEM with GIS technology. The topographic features and other geomorphological factors are analyzed and superposed with the ore-forming points and mining areas in the eastern part of Nanling to calculate the geomorphological factors of the ore points and the location of the mining areas. The favorable topographic and geomorphological environment for the occurrence of weathered crustal rare earth resources is discussed. The results show that the optimum ore-forming favorable geomorphology is 150 ~ 500m in height and 20 掳in slope. The topographic fluctuation is 100 ~ 400 m, the depth of surface cutting is 40 ~ 150 m, and the topographic feature is the peak or ridge. The results are expected to guide the exploration of ion-adsorbed rare earth deposits in the eastern part of Nanling.
【作者单位】：中国地质大学(北京)地球科学与资源学院;中国地质科学院矿产资源研究所;中国地质科学院;
【基金】：中国地质调查局地质大调查项目“我国离子吸附型稀土矿战略调查及研究”(编号:1212011220804)资助
【分类号】：P618.7
【正文快照】： 本文由中国地质调查局地质大调查项目“我国离子吸附型稀土矿战略调查及研究”(编号:1212011220804)资助。数字高程模型(Digital Elevation Model,简称DEM)是美国麻省理工学院的Chaires LMiller于1956—1958年首次提出来的,用于对地球表面地形地貌的数字表达、模拟。它由多种

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