{"id":3019,"date":"2021-12-24T00:08:31","date_gmt":"2021-12-24T00:08:31","guid":{"rendered":"http:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/?page_id=3019"},"modified":"2021-12-24T01:33:13","modified_gmt":"2021-12-24T01:33:13","slug":"annee-2012-contrat-de-collaboration-andra-universite-paris-sud-nn87890","status":"publish","type":"page","link":"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/recherche\/programmes-scientiques\/archives\/annee-2012-contrat-de-collaboration-andra-universite-paris-sud-nn87890\/","title":{"rendered":"Ann\u00e9e 2012: Contrat de Collaboration Andra-Universit\u00e9 Paris-Sud n\u00b0N87890"},"content":{"rendered":"\n<p><em>Etude g\u00e9ophysique de surface des affleurements bajociens de l\u2019Est du Bassin de Paris&nbsp;: Apport sur la compr\u00e9hension des structures d\u00e9tect\u00e9es en sismiques 3D dans la zone de transposition (ZT)<\/em>.<\/p>\n\n\n\n<p>Contrat de collaboration <strong>Andra-Universit\u00e9 Paris-Sud<\/strong>.<\/p>\n\n\n\n<p>Responsable Scientifique : Benjamin Brigaud<\/p>\n\n\n\n<p>Dur\u00e9e 1 an, ann\u00e9e: 2012<\/p>\n\n\n\n<p>Universit\u00e9 Paris-Sud&nbsp;: Benjamin Brigaud (Responsable Scientifique de l\u2019Etude, S\u00e9dimentologue&nbsp;; Maitre de conf\u00e9rences, Universit\u00e9 Paris-Sud), Albanne Saintenoy (Ma\u00eetre de conf\u00e9rence, g\u00e9ophysicienne Radar, Universit\u00e9 Paris-Sud), Marc Pessel (Maitre de conf\u00e9rences, g\u00e9ophysicien \u00e9lectrique, Universit\u00e9 Paris-Sud), Herman Zeyen (Professeur, sismique r\u00e9flexion), Fr\u00e9d\u00e9ric Hirn (\u00e9tudiant stagiaire du Master2 \u00ab&nbsp;Environnements s\u00e9dimentaires&nbsp;\u00bb du D\u00e9partement des Sciences de la Terre d\u2019Orsay), Jessica Sa\u00efag (\u00e9tudiant stagiaire du Master1 \u00ab&nbsp;Sciences de la Terre&nbsp;\u00bb du D\u00e9partement des Sciences de la Terre d\u2019Orsay)<\/p>\n\n\n\n<p>Andra&nbsp;: Daniel Guillemot, Michel Hayet<\/p>\n\n\n\n<p><strong>Objectif et description du projet scientifique<\/strong><\/p>\n\n\n\n<p>La sismique 3D haute r\u00e9solution acquise par l\u2019Andra en 1999, et retrait\u00e9e en 2002-2003 sur le site du laboratoire souterrain a montr\u00e9 la pr\u00e9sence de rides d\u2019orientation N120\u00b0 d\u2019allure anticlinale \u00e0 la base du Dogger calcaire. Le forage d\u00e9vi\u00e9 EST210 et les affleurements du Bajocien inf\u00e9rieur dans les environs de Neufch\u00e2teau semblent indiquer que les antiformes d\u00e9tect\u00e9s en sismique correspondent \u00e0 l\u2019expression sismique de bioconstructions coralliennes. La pr\u00e9sence et l\u2019origine des alignements N120\u00b0 de ces bioconstructions coralliennes \u00e0 l\u2019aplomb d\u2019un futur site de stockage de d\u00e9chets radioactifs semblent un point important qu\u2019il convient de mieux comprendre afin de l\u2019int\u00e9grer dans la conceptualisation g\u00e9ologique du site.<\/p>\n\n\n\n<p>La direction N120\u00b0 de ces structures align\u00e9es n\u2019\u00e9tant pas, a priori, ni une direction structurale fr\u00e9quente dans le Jurassique de la zone d\u2019\u00e9tude, ni une direction connue de pal\u00e9o-courants, l\u2019origine de ces alignements reste donc \u00e9nigmatique. Une \u00e9tude s\u00e9dimentologique a d\u00e9j\u00e0 permis de mettre en \u00e9vidence, pour la premi\u00e8re fois, des bioconstructions coralliennes ayant une orientation N120\u00b0 \u00e0 l\u2019affleurement (Figure 1). D\u2019une quinzaine de m\u00e8tres de hauteur et large d\u2019une cinquantaine de m\u00e8tres, la bioconstruction principale a \u00e9t\u00e9 observ\u00e9e dans la carri\u00e8re de Sommer\u00e9court. Dans les d\u00e9p\u00f4ts sus-jacents, les premiers r\u00e9sultats structuraux montrent la pr\u00e9sence de fractures d\u2019orientation N110\u00b0 \u00e0 130\u00b0, sub-verticales, pluri-m\u00e9triques et ciment\u00e9es par de la calcite. Ces fractures sont probablement localis\u00e9es par la bioconstruction mais ne semblent pas \u00eatre des structures d\u2019extrados.<\/p>\n\n\n\n<p>Apr\u00e8s cette phase s\u00e9dimentologique, trois carri\u00e8res ont \u00e9t\u00e9 s\u00e9lectionn\u00e9es pour \u00eatre l\u2019objet de mesures g\u00e9ophysiques (g\u00e9o-radar, panneau-\u00e9lectrique) afin d\u2019imager (1) l\u2019ancrage en profondeur de ces structures construites, et (2) l\u2019extension et les relations entre faci\u00e8s construits et inter-r\u00e9cifaux. L\u2019objectif principal de ce volet g\u00e9ophysique est de d\u00e9finir la dynamique de mise en place de ces bioconstructions (s\u00e9dimentologique vs. structurale), afin de mieux en comprendre la distribution g\u00e9ographique \u00e0 l\u2019\u00e9chelle r\u00e9gionale.<\/p>\n\n\n\n<p><strong><u>Mots clefs&nbsp;<\/u><\/strong>: s\u00e9dimentologie, stratigraphie, diagen\u00e8se, carbonate, p\u00e9trophysique, pal\u00e9ohydrologie<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Etude g\u00e9ophysique de surface des affleurements bajociens de l\u2019Est du Bassin de Paris&nbsp;: Apport sur la compr\u00e9hension des structures d\u00e9tect\u00e9es en sismiques 3D dans la zone de transposition (ZT). Contrat de collaboration Andra-Universit\u00e9 Paris-Sud. Responsable Scientifique : Benjamin Brigaud Dur\u00e9e 1 an, ann\u00e9e: 2012 Universit\u00e9 Paris-Sud&nbsp;: Benjamin Brigaud (Responsable Scientifique de l\u2019Etude, S\u00e9dimentologue&nbsp;; Maitre de [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3013,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"","meta":{"ngg_post_thumbnail":0,"footnotes":""},"class_list":["post-3019","page","type-page","status-publish","hentry","post-preview"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Ann\u00e9e 2012: Contrat de Collaboration Andra-Universit\u00e9 Paris-Sud n\u00b0N87890 - benjamin brigaud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/recherche\/programmes-scientiques\/archives\/annee-2012-contrat-de-collaboration-andra-universite-paris-sud-nn87890\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ann\u00e9e 2012: Contrat de Collaboration Andra-Universit\u00e9 Paris-Sud n\u00b0N87890 - benjamin brigaud\" \/>\n<meta property=\"og:description\" content=\"Etude g\u00e9ophysique de surface des affleurements bajociens de l\u2019Est du Bassin de Paris&nbsp;: Apport sur la compr\u00e9hension des structures d\u00e9tect\u00e9es en sismiques 3D dans la zone de transposition (ZT). Contrat de collaboration Andra-Universit\u00e9 Paris-Sud. 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