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Permian magmatism and basin dynamics in the southern Pyrenees: A record of the transition from late Variscan transtension to early Alpine extension

By
M. Lago
M. Lago
1
Departamento de Ciencias de la Tierra, Área de Petrología y Geoquímica, Universidad de Zaragoza, C/Pedro Cerbuna, 12, 50009 Zaragoza, Spain (e-mail: mlago@posta.unizar.es)
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E. Arranz
E. Arranz
1
Departamento de Ciencias de la Tierra, Área de Petrología y Geoquímica, Universidad de Zaragoza, C/Pedro Cerbuna, 12, 50009 Zaragoza, Spain (e-mail: mlago@posta.unizar.es)
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A. Pocoví
A. Pocoví
2
Departamento de Ciencias de la Tierra, Área de Geodinámica Interna, Universidad de Zaragoza, C/Pedro Cerbuna, 12, 50009 Zaragoza, Spain
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C. Galé
C. Galé
1
Departamento de Ciencias de la Tierra, Área de Petrología y Geoquímica, Universidad de Zaragoza, C/Pedro Cerbuna, 12, 50009 Zaragoza, Spain (e-mail: mlago@posta.unizar.es)
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A. Gil-Imaz
A. Gil-Imaz
2
Departamento de Ciencias de la Tierra, Área de Geodinámica Interna, Universidad de Zaragoza, C/Pedro Cerbuna, 12, 50009 Zaragoza, Spain
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Published:
January 01, 2004

Abstract

Permian magmatism in the Pyrenees is characterized by two compositionally different and temporally consecutive magmatic episodes: a calc-alkaline–transitional phase (andesites) and a mildly alkaline phase (basalts and dolerites). These two magmatic episodes were related to the attenuation of late Variscan transtensional tectonics and the onset of extension related to regional rifting. The strike-slip fault systems that affected the Pyrenees in late Variscan times initially controlled the development and morphology of the sedimentary basins. These were periodically affected by phases of extension, which controlled the subsidence of the basins, and, in addition, the emplacement of magmas. The whole-rock trace-element and isotopic signature of the andesites suggests that they were derived from the upper mantle and variably hybridized with late orogenic crustal melts, whereas the alkali basalts could have been derived from a lithospheric mantle source, enriched as a consequence of Variscan subduction processes with the contribution, in some areas, of an enriched (asthenospheric) component.

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Geological Society, London, Special Publications

Permo-Carboniferous Magmatism and Rifting in Europe

M. Wilson
M. Wilson
Leeds University, UK
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E.-R. Neumann
E.-R. Neumann
University of Oslo, Norway
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G. R. Davies
G. R. Davies
Vrije University, The Netherlands
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M. J. Timmerman
M. J. Timmerman
Universität Potsdam, Germany
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M. Heeremans
M. Heeremans
University of Oslo, Norway
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B. T. Larsen
B. T. Larsen
Norsk Hydro ASA/Saga Petroleum ASA, Norway
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Geological Society of London
Volume
223
ISBN electronic:
9781862394711
Publication date:
January 01, 2004

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