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Journal of the Geological Society; 2001; v. 158; issue.4; p. 583-592
© 2001 Geological Society of London

Regular Article

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

1 Faculteit der Aardwetenschappen, Vrije Universiteit, 1085 De Boelelaan, 1081 HV Amsterdam, The Netherlands
2 Department of Earth Sciences, The Open University, Milton Keynes MK7 6AA, UK
3 Departmento de Geofisico, Universidade de Sao Paulo, 01051 Sao Paulo SP, Brazil
4 Present address: Department of Geology & Geophysics, University of Edinburgh EH9 3JW, UK (e-mail: Linda.Kirstein{at}glg.ed.ac.uk)
5 Present address: Department of Earth Sciences, University of Bristol BS8 1RJ, UK

Scientific editing by Sally Gibson.

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.


Keywords: Ar/Ar, magmas, Paraná–Etendeka, Uruguay, South Atlantic, felsic magmatism.




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