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Early Cretaceous Volcanism in Eastern Argentina

  • Silvia Leonor LagorioEmail author
  • Haroldo Vizán
  • Silvana Evangelina Geuna
Chapter
Part of the SpringerBriefs in Earth System Sciences book series (BRIEFSEARTHSYST)

Abstract

Volcanic rocks of Paraná Magmatic Province (PMP) are mostly located within the area of the intracratonic Paraná basin and covered an extensive region of Brazil, Paraguay, Uruguay and north-eastern Argentina. In the latter, the main outcrops are located in Misiones and Corrientes provinces, while a thick volcanic pile remains buried under the surface of Entre Ríos Province and in Chaco–Paraná basin (southern Paraná). The geochemical data presented here complement those published by other authors. In Misiones Province, rocks are tholeiitic lavas of high- and low-Ti varieties, whereas to the south, in Corrientes Province, lavas of low-Ti types prevail. Cu contents are high, comparable to those reported from lavas of Brazil. Evolution of HTi and LTi magmas must have occurred from two different parental magmas through fractional crystallization at low pressures, involving crustal contamination only for the Gramado variety, in agreement with the general trend recognized in the PMP. Geochemical features point out that different ancient subduction processes could have affected the source of the PMP basalts from Misiones Province, as those that occurred during Late Proterozoic–Early Cambrian associated to Paraguay belt, as well as even older ones related to the Nico Pérez terrane.

Keywords

Tholeiitic basalts Misiones Corrientes Paraná High-Ti basalts Low-Ti basalts 

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© The Author(s) 2016

Authors and Affiliations

  • Silvia Leonor Lagorio
    • 1
    Email author
  • Haroldo Vizán
    • 2
  • Silvana Evangelina Geuna
    • 2
  1. 1.Instituto de Geología y Recursos MineralesServicio Geológico Minero Argentino (IGRM-SEGEMAR), Parque Tecnológico MigueleteSan Martín, Buenos AiresArgentina
  2. 2.IGEBA (CONICET-UBA)Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos AiresCiudad Autónoma de Buenos AiresArgentina

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