LES PLATES-FORMES CARBONATEES Journées En L’Honneur D’Hubert Arnaud

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LES PLATES-FORMES CARBONATEES Journées En L’Honneur D’Hubert Arnaud pécialis n s ée io d n e u l a é S R G F LES PLATES-FORMES CARBONATEES Journées en l’honneur d’Hubert Arnaud 27 & 28 novembre 2017 Salle Van Straelen 77 rue Claude Bernard 75005 Paris Avec le soutien Organisateurs : é G c ro ta u Thierry Adatte é p r e C F u r d a (Université de Lausanne) n s i ç a a ASSOCIATION ç i s n DES SEDIMENTOLOGISTES d a & r u FRANCAIS F C e r p é u t a o c r Danièle Grosheny é G (Université de Lorraine) Séance Spécialisée de la Société Géologique de France Avec le soutien de l’ASF, du GFC et de l’Institut Dolomieu LES PLATES-FORMES CARBONATEES Journées en l’honneur d’Hubert Arnaud Livret des résumés Organisées par Thierry Adatte et Danièle Grosheny 1 Hubert sur le terrain, au Pilatus 2 Notre collègue et ami Hubert est né le 18 novembre 1939 à Tunis. Il est parti dans la soirée du 27 novembre 2016. Il venait d’avoir 77 ans. Après des études secondaires à Bizerte, Hubert effectue son cursus universitaire à Grenoble où il devient assistant dès 1963. Il y soutient sa thèse de 3e cycle, intitulée «Contribution à l’étude géologique du Vercors méridional – Alpes françaises» en 1964, puis, obtient le titre de docteur d’Etat en 1981. Il est lauréat du prix Prouvost de la SGF en 1982. De 1982 à 1984, Hubert est spécialiste des carbonates chez Elf-Aquitaine à Pau. Il travaille alors en Italie, Tunisie et en Angola. En 1989, Hubert devient Professeur des Universités à Grenoble et continue à parcourir le monde en réalisant ses travaux sur le Crétacé inférieur en Syrie, Azerbaidjan, Géorgie, Oman, Mexique, Venezuela. Il applique alors les concepts de la stratigraphie séquentielle à la géométrie sédimentaire de l’urgonien du sud-est de la France. Hubert prend sa retraite en 2003 mais, il continue, sans discontinuer, à parcourir le monde toujours aussi passionné par son métier. En 2005, avec Annie, Hubert nous avait conduit géologiquement et culturellement dans sa Tunisie qu’il aimait tant, lors d’une excursion sur les séries de l’Aptien au Cénomanien En octobre 2016, Hubert a, une nouvelle fois, menée une excursion géologique sur son urgonien du Vercors qu’il aimait tant. Auteur de plus de cinquante articles, il laisse à la communauté géologique une somme impressionnante de connaissances et d’observations sur la sédimentologie des carbonates. Façade Sud-Ouest du Vercors – Montagne de Glandasse 3 PROGRAMME Lundi 27 novembre 9h30 : Accueil 10h00 : Introduction par les organisateurs 10h05 : Hommage à Hubert Arnaud 10h15 : Conférence de Maurice Tucker.- Carbonate Platforms: the Roles of Microbes. 11h10 : Pause café 11h40 : Bernard Duval, Philippe A. Lapointe.- Pétrole, carbonates, géosciences. 12h10 : Benjamin Brigaud, Simon Andrieu, Jocelyn Barbarand, Eric Lasseur.- Définir les paléo-environnements lorsque les sédiments manquent : analyses géochimiques in situ des ciments des discontinuités. 12h30 : Stéphane Bodin.- Responses of neritic carbonate factories to Jurassic environmental changes Example from the Central High Atlas of Morocco 13h10 : Pause repas (non organisée par la SGF) 14h30 : Conférence de Karl Föllmi.- The evolution of the Urgonian platform in the light of late Early Cretaceous paleoenvironmental change 15h25 : Brahimsamba Bomou.- The mexican Guerrero-Morelos carbonate platform throughout the Cenomanian-Turonian boundary 15h55 : Pause café 16h20 : Philippe A. Lapointe .- Sequence Stratigraphy and Seismic Stratigraphy of the Lower Cretaceous Shuaiba Formation from Abu Dhabi Ruwais Field. 16h50 : Lucie Bonvallet, Annie Arnaud, Alexis Godet, Thierry Adatte, Jorge E. Spangenberg, Karl B. Föllmi.- Evolution of the Helvetic shelf (Switzerland) during the Barremian - early Aptian: Paleoenvironmental, paleogeographic and paleoceanographic controlling factors. 17h00 : Débat : Appréciation du temps géologique: nouvelles méthodes versus biostratigraphie. 4 Mardi 28 novembre 9h00 : Accueil 9h30 : Rémy Richet, Jean Borgomano, Sophie Viseur, Jean-Pierre Masse.- High-resolution stratigraphic model of the Urgonian carbonate platform in the Gresse-en-Vercors area (SE France). 10h00 : Serge Ferry.- Growth faults affecting the internal geometry and facies of depositional sequences, lower Barremian, southeastern Vercors carbonate platform, France. 10h30: Pause café 11h00 : Conférence de Peter W. Skelton.- Aptian carbonate platform development in the Alicante region, SE Spain. 11h55 : Rabaa Hfaiedh Alexis Godet, Annie Arnaud Vanneau, Jamel Ouali.- Biostratigraphy and palaeoenvironments of the Aptian sedimentary succession at Jebel Bir Oum Ali (Northern Chain of Chotts, South Tunisia): Comparison with contemporaneous series from the southern Tethyan margin. 12h25 : Pause repas 14h00 : Alexis Godet, Christophe Durlet, Jorge E. Spangenberg, Karl B. Föllmi.- Meteoric diagenetic overprint on the carbon isotope composition of Urgonian-type platform carbonates from the western Swiss Jura 14h30 : Jean-Pierre Masse, Mukerrem Fenerci-Masse.- Les rudistes et la datation des formations carbonatées de type Urgonien du Sud-Est de la France 15h00 : Jean Vermeulen, Hubert Arnaud.- Ages of the marine series underlying the Urgonian in the Gard 15h30 : Annie Arnaud Vanneau.- Modalities of the installation of the Urgonian during the late Barremian on the north-Tethyan margin of France and Switzerland. 16h00 : Pause café et clôture 5 Résumés 6 Modalités de l’installation de l’Urgonien au Barrémien supérieur sur la marge nord téthysienne de France et de Suisse Annie Arnaud-Vanneau1, Karl B. Föllmi2, Alexis Godet3, Thierry Adatte2, Lucie Bonvallet1 1Association Dolomieu, 18 Boulevard Maréchal Leclerc, F-38000 Grenoble, France 2Institute of Earth Sciences, University of Lausanne, UNIL Quartier Mouline, CH-1015, Lausanne, Switzerland 3Department of Geological Sciences, The University of Texas at San Antonio, 1 UTSA Circle, San Antonio, Texas, 78249, USA Les calcaires à rudistes qui vont constituer l’Urgonien en France et Suisse ou le Schrattenkalk en Suisse alémanique vont s’installer sur la marge nord téthysienne au Barrémien supérieur. Grâce aux études récentes menées dans le cadre des thèses sur le Gard, l’Ardèche et la Provence (Bastide, 2014), sur les Alpes helvétiques (Bonvallet, 2015) et les datations par ammonites situées sous la falaise urgonienne (Vermeulen, 2017 en cours), nous avons tous les éléments pour suivre précisément l’installation de cette plate-forme de calcaire à rudistes. Ainsi au cours du Barrémien inférieur les dépôts carbonatés bioclastiques peu profonds s’installent sur les bordures du bassin vocontien en formant des corps sédimentaires de superficie réduite, assimilables à des corps de bas- niveau. Au Barrémien supérieur le niveau de la mer va s’élever et ennoyer de plus en plus largement la marge nord-téthysienne au cours de la séquence B3, entrainant le développement des lagons à rudistes et des calcaires urgoniens. C’est la dynamique de dépôt de cette séquence qui va être développée à présent. La base de la séquence B3 débute par un abaissement du niveau marin évalué à une centaine de mètres dans le sud du Vercors. Ce bas niveau est responsable de l’émersion et de l’érosion d’une partie émergée des dépôts du Barrémien inférieur, et probablement d’une partie de l’Hauterivien. Les premiers dépôts calcaires peu profonds sous faciès bioclastiques sont limités à la bordure du bassin vocontien. Les dépôts suivants s ‘installent de plus en plus loin sur la surface antérieurement émergée. Les dépôts de transgression (TST) se développent sur la bordure du bassin vocontien sous forme d’une frange récifale constituée de petits atolls coralliens de 500 m à 2 km de diamètre pouvant renfermer des lagons à rudistes de taille limitée. Ces atolls s’installent sur des shoals oolitiques formant une bande d’une largeur d’une dizaine de kilomètres dans le Vercors. Au-dessus, l’élévation du niveau marin devient plus importante (marnes de Font Froide dans le Vercors) et des ammonites ont été retrouvées dans les zones les plus externes proches du bassin. Ces marnes peuvent être considérées comme correspondant à la mfs de la séquence B3. Les séries sus-jacentes sont beaucoup plus détritiques et la faune présente témoigne du changement environnemental qui devient soit mésotrophique avec la multiplication des orbitolines (Palorbitolina transiens), soit distrophique avec la pullulation d’annélides isolés. Ces dépôts vont se retrouver jusqu’à 15 à 30 de km de la bordure de la plate-forme. L’élévation du niveau marin est estimée de 30 à 40 m. La transgression arrive sur des surfaces émergées et érodées (surface d’érosion, et Barrémien inférieur partiellement manquant dans le Gard, traces de racine et galets dans le Vercors et le Jura) Les dépôts qui viennent au-dessus forment le HST et constituent une trilogie observable de la Provence à la Suisse avec à la base des faciès bioclastiques et oolitiques, puis des faciès assez riches en coraux et éponges calcaires et enfin des faciès à rudistes, faciès urgoniens par définition. Au sommet de la séquence B3, les derniers dépôts indiquent des faciès de plage ou d’émersion. Le sommet de cette séquence finit par émerger, les sédiments se cimentent précocement et sont en partie karstifiés. L’abaissement du niveau marin correspondant à la fin de la séquence B3 peut être de l’ordre d’une quinzaine de mètres. La durée de cette séquence B3 a été estimée à 920 000 ans, avec une vitesse de remontée passant de 0,88 à 0,71m/1000 ans jusqu’à la mfs, puis se stabilisant autour de 0,29 m/1000 ans pour le HST. 7 Modalities of the installation of the Urgonian during the late Barremian on the north-Tethyan margin of France and Switzerland Rudist limestones that constitute the Urgonian Formation in France and Switzerland, as well as its lithostratigraphic equivalent (the Schrattenkalk Formation) in northern Switzerland, settled on the northern Tethyan margin in the late Barremian. Recent studies performed in the Gard, Ardèche and Provence regions of France (Bastide, 2014), in the Swiss Alps (Bonvallet, 2015), are complemented by the dating of ammonites located under the Urgonian Formation in Gard and Ardèche, France (Vermeulen, 2017, in progress), and permit to precisely follow the installation of this rudists-bearing carbonate platform.
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