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从地质角度分析了红层的形成与出露,阐述了紫色土的可能分布.紫色土由红层紫色岩所形成,紫色岩是红层岩石的最重要成员,它们是在干热环境下形成.其中的染色物质是地壳中的含铁矿物在合适的地表环境条件下与大气中的氧相互作用的产物.红层多在地史上的造山运动与海退之后出现,所以在全球有广泛的分布.各地红层紫色岩并无本质区别,只是沉积年代、质地、色泽以及岩层组合等有所差异,这些差异对紫色土性质的影响倒是值得进一步研究.
From the view of geology, the formation and the emergence of red beds are analyzed, and the possible distribution of purple soils is explained.The purple soil is formed by the purple beds of red beds, which are the most important members of the red beds and formed under dry heat environment Which is the product of the interaction of iron-bearing minerals in the earth’s crust with atmospheric oxygen under suitable surface conditions.The red beds mostly occur after the orogenic movement and regression in the history of the earth and are therefore widespread in the world The distribution of purple red rocks in different places is not different from each other except for the sedimentary age, the texture, the color and the combination of rock formations. The differences in the nature of purple soils deserve further study.