Abstract
Goldich′s weathering series (Goldich, 1938) is consistent with the results of thermochemical calculation on solubility of silicates as a function of partial pressure of carbon dioxide and also the rate of dissolution of silicates experimentally determined.
However, it was found that this weathering series, solubility and dissolution rate of silicates are inconsistent with the rate of dissolution of Ca·Na-feldspar and pyroxene in Kanto-loam. Goldich′s weathering series, solubility and dissolution rate of Ca·Na-feldspar and pyroxene indicate that Ca·Na-feldspar is more stable or similar to Mg-pyroxene in the weathering series. However, Ca·Na-feldspar in the Kanto-loam was suffered more intense weathering than pyroxene. This inconsistency is interpreted in terms of the rapider rate of dissolution of Ca·Na-feldspar than pyroxene in organic ligand-rich soil water in near-surface environment, suggesting that organic acids are important for controlling the dissolution of Ca·Na-feldspar.
