Protracted felsic magmatic activity associated with the opening of the South Atlantic

L. A. Kirstein*, S. Kelley, C. Hawkesworth, S. Turner, M. Mantovani, J. Wijbrans

*Corresponding author for this work

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Felsic magmatism is often observed in the final stages of the eruption of continental large igneous provinces. The occurrence of these felsic extrusive igneous rocks potentially provides key information on the complex interplay of magmatism and tectonics. In this paper we investigate the timing of eruption of Early Cretaceous felsic magmas associated with the Paraná-Etendeka flood basalt province using the 40Ar/ 39Ar technique and interpret the results in terms of the recently proposed petrogenetic histories and dominant stress factors. There appears to be a link between lithospheric thinning and a change in the origin of the felsic magmas, from open system fractional crystallization to mid/lower crustal melting, particularly in southern Uruguay.

Original languageEnglish
Pages (from-to)583-592
Number of pages10
JournalJournal of the Geological Society
Volume158
Issue number4
DOIs
Publication statusPublished - 2001
Externally publishedYes

Keywords

  • Ar/Ar
  • Felsic magmatism
  • Magmas
  • Paraná-Etendeka
  • South Atlantic
  • Uruguay

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