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Bulletin de la Societe Geologique de France; May 2008; v. 179; no. 3; p. 289-296; DOI: 10.2113/gssgfbull.179.3.289
© 2008 Societe Geologique de France
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Revised radiolarian ages for the sedimentary cover of the Balagne ophiolite (Corsica, France). Implications for the palaeoenvironmental evolution of the Balano-Ligurian margin

Taniel Danelian1, Patrick De Wever2 and Michel Durand-Delga3

1 Université Pierre et Marie Curie, Paris 6, Micropaléontologie, UMR 5143 "Paléobiodiversité et Paléoenvironnements", case 104, 4 place Jussieu, 75252 Paris cedex 05, France. danelian{at}ccr.jussieu.fr
2 Muséum National d’Histoire Naturelle, UMR 5143 "Paléobiodiversité et Paléoenvironnements", Géologie, Département Histoire de la Terre, 43 rue Buffon, 75005 Paris, France
3 La Pélisserie, 81150 Florentin, France

The age of radiolarites covering the Balagne ophiolite is reassessed based on new and revised radiolarian fossil evidence. The oldest radiolarian cherts are dated as upper Bathonian-lower Callovian in two tectonic units: San Colombano and Novella. These are amongst the oldest ages available so far from ophiolites of the Ligurian ocean. An important stratigraphic gap, spanning the Callovian-early Kimmeridgian interval, is specified between radiolarites and the overlying (and locally gullying) San Colombano shallow-water limestones (sub-unit I). We can now specify that radiolarian ooze accumulated until the late Kimmeridgian in the distal parts of the Balagne margin (sub-unit SC III and Novella unit), while fragments of Hercynian basement fell into the Balagne basin during the late Kimmeridgian-Tithonian.

Key Words: Corsica • Radiolaria • Ophiolites • Ligurian ocean • Balagne nappe • Jurassic






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