用DEM圈定风化壳淋积型稀土矿基岩的研究——以江西安远县石头坪重稀土矿普查为例  

Study on the Identification of the Weathered Crust Elution-deposited Rare-earth Ore Bedrock with DEM-Take the General Survey of Shitouping Heavy Rare Earth Mine in Anyuan County,Jiangxi Province as an Example

作　　者：黄建村 熊彩云 黄修齐 李倩 HUANG Jian-cun;XIONG Cai-yun;HUANG Xiu-qi;LI Qian(Jiangxi Nonferrous Metals Geology and Mineral Resources Exploration and Development Institute,Nanchang 330002,China;First Geological Team,Jiangxi Geological Bureau,Nanchang 330052,China;Jiujiang Surveying and Mapping Geographic Information Co.,Ltd.,Jiujiang 332000,China)

机构地区：[1]江西有色地质矿产勘查开发院,江西南昌330002 [2]江西省地质局第一地质大队,江西南昌330052 [3]九江市测绘地理信息有限公司,江西九江332000

出　　处：《稀土》2024年第5期97-107,I0005,共12页Chinese Rare Earths

基　　金：江西省地矿基金项目(20180004)。

摘　　要：传统填图法圈定风化壳淋积型稀土矿的基岩区存在控制点不足及界线圈连缺乏科学理论指导的弊病。五个可行性支撑基础表明,侵入岩区风化壳淋积型稀土矿可用DEM进行地形因子“坡度”的提取对风化壳(矿体)进行圈定。经过实验,在实地测量41个基岩界线点基础上(仅为传统填图方法所需最少点数的5.62%),通过计算基岩界线的平均坡度值,在1.58平方千米的窗口区范围内圈定出了240处(总面积为七万余平方米)基岩分布区。圈定结果能经得起现场的反向校验,误差在相应比例尺允许的范围之内(首测平均坡度角与校核平均坡度角差值为0.13°、实测点与相对理论点距离最大误差8.40米)。该方法在试验区内用少量的样本抽检(实测基岩界线点)即可反映总体(区内基岩分布)特征,解决了用传统方法的控制不足及界线圈连缺乏理论指导的弊病,是一种高效科学的方法,具有方法流程可操作性强的特点。The traditional geological mapping method for delineating the bedrock zone of weathered crust elution-deposited rare earth ore has the drawbacks of insufficient control points and lack of scientific guidance for boundary delineation.Five feasibility foundations show that the topographic factor"slope"of the weathered crust elution-deposited rare earth ore in the intrusive rock area can be extracted by digital elevation model(DEM)for delineation.Through experiments,based on the measurement of 41 bedrock boundary points(only 5.62%of the minimum number of points required by the traditional mapping method),the average slope value of the bedrock boundary is calculated,and 240 bedrock distribution areas(with a total area of more than 70000 square meters)are delineated within the range of 1.58 square kilometers.The delineation results can withstand the field reverse verification,and the error is within the allowable range of the corresponding scale(the difference between the first measured average slope angle and the check average slope angle is 0.13°,and the maximum error distance between the measured point and the relative theoretical point is 8.40 meters).This method can reflect the overall characteristics(distribution of bedrock in the area)with a small number of sample checks(measured bedrock boundary points),solving the problems of insufficient control and lack of theoretical guidance for boundary delineation in traditional methods.It is a highly efficient and scientific method with strong operability.

关 键 词：数字高程模型(DEM) 风化壳淋积型稀土矿 基岩界线点 平均坡度 可操作性 

分 类 号：P623.3[天文地球—地质矿产勘探]