抄録
(1) Studies were made on the weathering of granodiorite at Nishisho-mura, Sayo-gun, Hyogo-ken. (2) The grano-diorite decomposes gradually as granite, and the light yellowish-brown sandy subsoil and the yellowish-brown sandy surface soil are formed. (3) With the progress of weathering SiO2 Al2O3 values in total analyses diminish slowly. (4) Among the bases in the rock Ca and Na are readily leached out by weathering, but K and Mg are less leachable. (5) The weathered rock and soils contain the complex A2 which consists mainly of halloysite, the complex B consisting of kaolinite, the free iron oxides, and a small amount of complex As. (6) The iron in the weathered rock exists mainly in the form of limonite, a part of which changes into the hematite form in the soils. (7) In the weathered rock and under soils a small amount of montmorollonite are formed. (8) In the quantity of the exchangeable bases and in the degree of base saturation the weathering products of granodiorite are greater than those of b the granites reported previously by the author. (9) The granodicrite clay (<0.002mm) contains halloysite, kaolinite, free iron oxide, and a small amount of quartz particles.
