第四章 機械分散晕一、机械分散暈的形成和分散 1.疏松层的形成:基岩风化一般是首先受到物理风化。由于溫度的改变体积胀縮,使岩石产生裂缝(如图1)。以后,即伴随着化学风化,主要是降水浸入裂隙的影响,基岩裂隙增多,使岩石变成各种岩块,深部大、上部小(如图2)。这种作用繼续下去使上部已成为細粒疏松的物質,经过植物及其他生物腐烂等作用而成土壤,下部为細颗粒,再向下即为石礫、小石块、大石块和无裂縫的基岩(如图3)。以上这些都是破坏作用的結果。当地表为适当細粒物質时,就产生了搬 The fourth chapter mechanical dispersion Halo First, the mechanical dispersion Halo formation and dispersion 1. Loose layer formation: bedrock weathering is generally the first physical weathering. As the temperature changes the volume expansion and contraction, the rock cracks (Figure 1). After that, along with the chemical weathering, mainly due to the influence of precipitation immersed in the fractures, the bedrock fissures increased to make the rocks into various rock masses with large deep parts and small upper parts (Figure 2). This effect continues to make the upper part of the material become loose loose, through the role of plants and other biological decay of soil, the lower part of the fine particles, and then down is gravel, small stones, boulders and no Cracked bedrock (Figure 3). All of these are the result of damaging effects. When the local table for the appropriate fine-grained material, it produced a move