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山前平原这一自然地理概念是指发育在多种构造成因和规模悬殊的各类盆地中与山区相邻的平原地带;从巨大的地块到褶皱带的边缘坳陷,直到小型的山间盆地,均可被来自山区的第四纪沉积物所充填,形成大小不一的山前平原带。中国西部山前平原极为发育,其沉积物包括成带分布的多种成因类型,如洪积、冲积、湖积以及化学沉积等。这些物质均来源于共同的山区。
The piedmont plain, a natural geography concept, refers to a plains area adjacent to the mountains in a variety of basins of various tectonic causes and scales; from the huge massif to the marginal depressions of the fold belt until small mountain ranges Basins can be filled with Quaternary sediments from the mountains to form plinths of varying sizes. The piedmont plain in western China is extremely developed. Its sediments include various genetic types of zonal distribution, such as alluvial, alluvial, lacustrine and chemical deposition. These materials are derived from common mountain areas.