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Bulletin de la Societe Geologique de France; September 2005; v. 176; no. 5; p. 403-416; DOI: 10.2113/176.5.403
© 2005 Societe Geologique de France
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Exhumation constraints for the lower Nevado-Filabride Complex (Betic Cordillera, SE Spain): a Raman thermometry and Tweequ multiequilibrium thermobarometry approach

Romain Augier1, Guillermo Booth-Rea2, Phillipe Agard1, José Miguel Martínez-Martínez2, Laurent Jolivet1 and José Miguel Azañón2

1 Laboratoire de Tectonique, UMR 7072, case 129, Université Pierre et Marie Curie, 75252, Paris, France. Corresponding author: romain.augier{at}lgs.jussieu.fr. Tel: (00 33) 144275260; Fax: (00 33) 144275085
2 Instituto Andaluz de Ciencias de la Tierra (C.S.I.C.-Universidad de Granada) and Dpt. de Geodinámica, Av. Fuentenueva s/n, E-18071 Granada, Spain.

The HP/LT rocks of the Nevado-Filabride complex (eastern Betic Cordillera) were exhumed during the Serravallian but knowledge of their retrograde P-T evolution remains fragmentary and not established for all its tectonic units. The present paper places detailed constraints on the P-T evolution of the two deeper units of the Nevado-Filabride complex, namely the Ragua and the Calar Alto units in order to constrain their exhumation and the role of the km-thick Dos Picos shear zone separating them. Our approach uses both TWEEQU software multiequilibrium thermobarometry and Raman spectrometry thermometry. The study enables to [i] estimate the peak-temperature P-T conditions (c. 520°C) and then to establish the first P-T path of the Ragua unit, [ii] conclude that the Ragua and the Calar Alto units suffered comparable metamorphic evolutions with [iii] a well constrained HT excursion following a strong decompression characterised by limited heating. The study also enables to infer that the major Dos Picos shear zone was a post-metamorphic thrust occurring during the final retrogression stages. These results point to exhumation processes intermediate between those of syn– and post– orogenic contexts during the late evolution of the Betics.

Key Words: Betic Cordillera • Exhumation • Thermobarometry • Raman spectrometry • P-T paths






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