Sedimentological studies of the "Ilha de Marchantaria" in the Solimões/Amazon River near Manaus

Abstract

Sedimentological studies on the Ilha de Marchantaiia an island in the Amazon river near Manaus reveai the existence of four different structural main units.Dunng high water periods when the whole island is flooded by the river, additional sedimentation takes place especially in the upstream area of the island. There is however, extensive erosion of the banks on the upstream side of the island. By erosion of the upstream end and sedimentation processes on the downstream end the island moves slowly downstream.