Le front de la « Zone des marbres » (Pyrénées basco-cantabriques,Espagne), un chevauchement fini-crétacé fossilisé par les brèches marines paléocènes ? |
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| Authors: | Bernard Peybernès Marie-José Fondecave-Wallez Pierre-Jean Combes |
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| Institution: | 1. UMR 5573–CNRS, Stramipal, université Paul-Sabatier, 39, allées Jules-Guesde, 31062 Toulouse cedex 04, France;2. UMR 5563–CNRS, « Mécanismes de transfert en géologie », université Paul-Sabatier, 39, allées Jules-Guesde, 31062 Toulouse cedex 04, France;3. UMR 5573–CNRS, « Dynamique de la lithosphère », université Montpellier-2, place Eugène-Bataillon, 34095 Montpellier cedex 05, France |
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| Abstract: | The post-metamorphic breccias which underline the frontal overthrust of the ‘Marble Zone’ (Basque–Cantabrian Pyrenees, Province of Navarre, Spain), interpreted by P. Lamare as ‘mylonites’, correspond to sedimentary breccias of submarine canyon, filling former incised valleys dug within the metamorphic Jurassic/Early Cretaceous carbonates already folded and cleaved (Pyrenean Cretaceous tectorogen). Associated to microrhythmic hemipelagites containing Danian–Selandian planktonic foraminifera from the P1c–P3 interval, these breccias are now assigned to Palaeocene. Stratified and horizontal, they seal Late-Cretaceous structures, of which the overthrusting front of the ‘Marble Zone’ could be the principal regional element. |
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| Keywords: | Paléocène brèches foraminifères planctoniques chevauchement fini-crétacé Zone des marbres Pyrénées Espagne Palaeocene breccias planktonic foraminifera Late-Cretaceous overthrust Marble Zone Pyrenees Spain |
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