Processes of transformation and heoformation of smectites in the volcaniclastic deposits from the La Palma (Canary Islands)

Clay minerals from the volcaniclastic deposits of the three different sedimentary settings (paleosols, continental lacustrine and transitional, fan delta) have been studied by X-ray, MEB y TEM. The clay fraction of this sediments consist largely of smectite (saponite) with minor irregular chlorite-smectite mixed layers and illite; they occur as replacement of ferromagnesian minerals, plagioclase microlites and glass matrix of the volcarenite and they are inferred to be direct diagenetic alteration products of volcanic component