Vol. 25 No. 3 (1986)
Articles

LA CUENCA PARANAENSE. INFLUENCIA DE LOS BASALTOS EN LA INTERPRETACION GRAVIMETRICA

A. INTROCASO
Bio
R. GERSTER
Bio

Published 1986-07-01

How to Cite

INTROCASO, A., & GERSTER, R. (1986). LA CUENCA PARANAENSE. INFLUENCIA DE LOS BASALTOS EN LA INTERPRETACION GRAVIMETRICA. Geofísica Internacional, 25(3), 403-422. https://doi.org/10.22201/igeof.00167169p.1986.25.3.1224

Abstract

The Parana basin was in the lower Cretaceous - upper Jurasic witness of non explosive lava eruptions that covered a large part of the basin in several interestratified layers. Frequently the thickness of each layer is more than 80 m, while the sequence reach the 1 000 m near Salto (Uruguay).

The maximum distance run over by the lavas from the emission center was estimated in about 100 km, consistently with the small regional tilt. We think that the exceptional expression of outpouring lavas (more important than those of India) would be a regional phenomenon integrated by many local interrelationed events. The gravimetric studies suggest the existence of subvolcanic bodies that are interpreted as old intracortical magmatic chambers.

Different gravimetrical models were analyzed showing that intracortical positive masses associated with effusive events can justify the observed gravity.