Tectonic controls of the alkaline magmatism of Eastern Paraguay

Abstract

The alkaline magmatism of Paraguay is distributed in six provinces (Alto Paraguay, Rio Apa, Amambay, Central, Misiones and Assunção), with ages varying between Permian-Triassic and Eocene. These provinces, located in Eastem Paraguay, are frequently associated with major structural features, mainly faults, with magnetic and/or gravimetric expression. In this paper geologic and geophysical data are integrated in order to establish, as a first approximation, the tectonic controls for this alkaline magmatism.