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The Early Triassic magmatism of the Alto Paraguay Province, Central South America: Paleomagnetic and ASM data

Marcia Ernesto
  • Department of Geophysics, University of São Paulo, Rua do Matão 1226, 05508-090 São Paulo, SP, Brazil
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/ Piero Comin-Chiaramonti
  • Department of Mathematics and Geosciences, University of Trieste, Via Weiss 2, 34127 Trieste, Italy
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/ Celso de Barros Gomes
  • Institute of Geosciences, University of São Paulo, Rua do Lago, 05508-080 São Paulo, SP, Brazil
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Published Online: 2015-10-08 | DOI: https://doi.org/10.1515/geo-2015-0022

Abstract

A paleomagnetic studystudywork was carried out on the Alto Paraguay Province (APP), a belt of alkaline complexes that parallel the Paraguay river for more than 40 km at the border of Brazil and Paraguay. The province is well dated by 40Ar/39Ar method giving ages in the range 240–250 Ma with a preferred age of 241 Ma. Intrusive rocks are predominant but the stocks may be topped by lava flows and ignimbrites. Paleomagnetic work on stocks, dikes and flows of the APP identified normal and reversed magnetic components which are carried mainly by titanomagnetites. The calculated paleomagnetic pole located at 319ºE 78ºS (α95 = 6º; k = 23) is in agreement with other South American poles of Permo-Triassic age. Most of the sampling sites showed large variations in rock magnetization, but similar patterns in the variation of the within-site magnetizations, mainly in dikes, suggest geomagnetic polarity transition records. The magnetization data along with the anisotropy of magnetic susceptibility determinations suggested that the South and North areas of the province have different evolution characteristics.

Keywords: alkaline magmatism; paleomagnetism; magnetic anisotropy; Alto Paraguay Province

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About the article

Received: 2014-03-24

Accepted: 2014-02-23

Published Online: 2015-10-08


Citation Information: Open Geosciences, Volume 7, Issue 1, ISSN (Online) 2391-5447, DOI: https://doi.org/10.1515/geo-2015-0022.

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©2015 M. Ernesto et al.. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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