Abstract
The alteration of the limestone into parent material is described and discussed in this second part. The chemical and mineralogical (X-ray and microscope) analyses of the solid materials and the chemical analyses of the interstitial waters permit the following conclusions about the parent materials. 1. (A) Of the “young” soils: decalcification and desilication have occurred; low-ordered tridymite has been formed by replacement of the carbonates which, together with plagioclases and magnesite (Mg-calcite), have subsequently been transformed into smectite and kaolinite. 2. (B) Of the “old” soils: decalcification and desilication have occurred; hematite has been transformed into goethite and amorphous iron hydroxide; transformation of muscovite into illite and neoformation of kaolinite have occurred. The parent material of “old” soils represents a more advanced weathering stage than that of the “young” soils.
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