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Bulletin de la Societe Geologique de France; May 2003; v. 174; no. 3; p. 217-225; DOI: 10.2113/174.3.217
© 2003 Societe Geologique de France
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Paleogeographic patterns of the Cambrian-Ordovician transition in the southern Montagne Noire (France) : preliminary results

J. Javier Álvaro1, Cristina González-Gómez2 and Daniel Vizcaïno3

1 Laboratoire de Paléontologie et Paléogéographie du Paléozoïque, UMR 8014 CNRS, Université des Sciences et Technologies de Lille, UFR Sciences de la Terre, 59655 Villeneuve d’Ascq, France. Jose-Javier.Alvaro{at}univ-lille1.fr
2 Dpto. Ciencias de la Tierra, Universidad de Zaragoza, 50009 Zaragoza, Spain. cgonzale{at}posta.unizar.es
3 7, rue Jean-Baptiste Chardin, Maquens, 11090 Carcassonne, France. daniel.vizcaino{at}wanadoo.fr

Abstract

The Cambrian-Ordovician transition in the southern Montagne Noire records a major siliciclastic regressive trend of prograding shoaling complexes (the La Dentelle Formation), separating two transgressive storm-dominated sedimentary systems of mixed (carbonate-siliciclastic) deposits. The latter comprise the underlying La Gardie and Val d’Homs Formations, and the overlying Mounio Formation, all of them displaying evidence of an important synsedimentary tectonic activity. Isolated settings of carbonate productivity, located on intra-shelf ramps and horsts, contain the richest and diversified faunistic communities comprising trilobites, echinoderms, conodonts, carbonate- and phosphate-shell brachiopods, sponge spicules, etc. Although the Cambrian-Ordovician transition of the southern Montagne Noire did not record volcanic events but a rather distensive regime inducing paleotopographies, the latter may reflect a distinct extensional regime recorded in other earliest Ordovician platforms of the French Massif Central, involving oceanization and a major magmatic activity.

Key Words: Stratigraphy • Tectonism • Paleogeography • Cambrian • Ordovician • Montagne Noire




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