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Palaeoenvironmental changes at Col des Tribes (Montagne Noire, France), a reference section for the Famennian of north Gondwana-related areas

Published online by Cambridge University Press:  25 November 2013

CATHERINE GIRARD ,
JEAN-JACQUES CORNÉE ,
CARLO CORRADINI ,
AURÉLIEN FRAVALO  and
RAIMUND FEIST
CATHERINE GIRARD*
Affiliation:
Université Montpellier 2, UMR 5554 CNRS, Institut des Sciences de l'Evolution C.C. 64, Place Eugène Bataillon, F-34095 Montpellier, France
JEAN-JACQUES CORNÉE
Affiliation:
Université Montpellier 2, UMR 5243 CNRS, Géosciences Montpellier C.C. 60, Place Eugène Bataillon, F-34095 Montpellier, France
CARLO CORRADINI
Affiliation:
Università di Cagliari, Dipartimento di Scienze Chimiche e Geologiche, Via Trentino 51, I-09127 Cagliari, Italy
AURÉLIEN FRAVALO
Affiliation:
Université Montpellier 2, UMR 5554 CNRS, Institut des Sciences de l'Evolution C.C. 64, Place Eugène Bataillon, F-34095 Montpellier, France
RAIMUND FEIST
Affiliation:
Université Montpellier 2, UMR 5554 CNRS, Institut des Sciences de l'Evolution C.C. 64, Place Eugène Bataillon, F-34095 Montpellier, France
*
†Author for correspondence: catherine.girard@univ-montp2.fr
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Abstract

We present detailed biostratigraphy based on conodonts and palaeoenvironmental trends deduced from microfacies and conodont abundance through the Famennian (Late Devonian) at Col des Tribes (Montagne Noire, France). The succession is characterized by micritic limestones deposited in settings oscillating between mid to outer ramp. Facies contain poor fauna, widely dominated by nektonic organisms. This section is complete and one of the most conodont-rich for the Famennian of the north Gondwana-related area. The Upper Kellwasser event (Frasnian–Famennian boundary) and the Hangenberg (Devonian–Carboniferous boundary) have been lithologically identified. They are characterized by decimetre-thick black dysoxic to anoxic argillaceous sediments. The Condroz and annulata events, although not materialized by lithological changes, have been positioned due to the precise stratigraphy. The first event occurred during the deposition of condensed ferruginous facies (griotte limestones) and the second event during the deposition of micrites barren of benthic fauna. The combination of information from both facies and conodont biofacies changes allows a general sea-level curve through the entire Famennian for north Gondwana to be proposed for the first time. At Col des Tribes, the general trend is a slight deepening upwards from triangularis to trachytera zones, then a pronounced shallowing-upwards trend from upper trachytera to praesulcata zones. This curve correlates with the well-known reference curve from Euramerica concerning the late Famennian (trachytera to praesulcata Zones). There are some discrepancies in minor cycles which can be explained by tectonical phenomena at the onset of the edification of the Variscan belt in Europe.

Keywords

conodontsmicrofaciesDevonianMontagne Noiresea level

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Type
Original Articles
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Geological Magazine , Volume 151 , Issue 5 , September 2014 , pp. 864 - 884
Copyright
Copyright © Cambridge University Press 2013 

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