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This book analyzes the Early Cretaceous volcanic processes in
Misiones Province and in Sierra Chica de Cordoba (Argentina). The
volcanism in Misiones is tholeiitic and belongs to the Parana
Magmatic Province (PMP), which extends throughout South America. In
contrast, the volcanism in Cordoba is geographically restricted and
of alkaline nature, representing a potassic locality peripheral to
the PMP. To understand the causes of and geodynamic processes
involved in these volcanisms, a new 40Ar /39Ar of 129.6 +/- 1 Ma of
a trachyte from Sierra Chica de Cordoba is presented. This dating
points out that the volcanism in Sierra Chica de Cordoba slightly
postdates PMP lavas. Moreover, complementary geochemical analyses
from Misiones Province are presented and compared with those from
the whole PMP in order to characterize its source
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