Weathering of clay minerals in a Navarre andosol (Spain)

Abstract

The evolution of clay minerals in a Navarre Andosol (Spain) is investigated. The results indicate formation of allophane, evolution of trioctahedral mica to dioctahedral illite and the appearance of 10:14 A interstratified mineral m the lower layer. In the top horizons the interstratified mineral changes into vermiculite. The mineral distribution in the profile is indicated.