在地形地质图上求解岩层（矿层）真厚度的简便方法

介绍了３种在大比例尺地形地质图上求解岩层真厚度的简便方法，导线法是根据岩层上下层面已同程点连线的长度，高程差、与岩层倾向后夹角和岩层真倾角计算岩层真厚度，水平面切割法和铅直面切割法是通过假想的平面来获得岩层上下层面的２条走向线。它们之间的距离或离程关芬别代表了岩层的最大露头宽度或铅直厚度，结合岩层真倾角很救是岩层的真厚度。

THE CONVENIENT METHODS FOR EVALUATING THE TRUE THICKNESS OF STRATA (OR ORE BEDS) FROM A TOPOGRAPHIC GEOLOGICAL MAP

The paper proves three convenient methods for evaluating the true thickness of a stratum (or an ore bed) from a large scale topographic geological map. The traverse method indicates that the true thickness of a layer can be solved with the linear height deviation between the spot height of the upper and lower layers, dip angle of the interlayer and the true dip angle of the layer. The horizontal dissection method draws two trend lines of the upper and lower layers from the phantom. The distance or elevation differance of the trend lines stands respectively for the maximal width or perpendicular thickness of layer. Combined with the true dip angle, the true thickness of the layer can be determined easily.