Contenidos de uranio de lavas recientes en el sector sur de los Andes centrales

Abstract

We have studied the distribution of U in modern lava -flows of the southern part from the Central Andes (16°-28° S). For a given SiO₂, content of the rocks, U abundance increases from west to east in a transects to the Andean Belt, while the depth of the subduction zone increases and the thickness of the continental curst decreases. Besides, U content tends to inerease steadly with the latitude, while the thick of the continental crust and the depth of the seismic zone decreases southward. Thus, on the basis of the available data, we are in a position to suggest that the U behavior in the studied lavas depends on the alkalanity and magmatic history of each volcanic center.