{"id":3463,"date":"2025-06-20T21:31:21","date_gmt":"2025-06-20T21:31:21","guid":{"rendered":"http:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/?p=3463"},"modified":"2026-01-18T21:37:14","modified_gmt":"2026-01-18T21:37:14","slug":"3463-2","status":"publish","type":"post","link":"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/3463-2\/","title":{"rendered":"L\u2019\u00e9nigmatique alignement N120\u00b0 des r\u00e9cifs coralliens jurassiques de l\u2019Est de la France r\u00e9solu"},"content":{"rendered":"\n<p>Des cr\u00eates \u00e9nigmatiques, large de quelques dizaines de m\u00e8tres et tr\u00e8s rectilignes, orient\u00e9es N120\u00b0 avait \u00e9t\u00e9 identifi\u00e9es dans les calcaires bajociens du Bassin de Paris gr\u00e2ce \u00e0 l\u2019imagerie sismique 3D effectu\u00e9es lors des toutes premi\u00e8res prospections g\u00e9ologiques men\u00e9es par l\u2019Andra (Agence nationale pour la gestion des d\u00e9chets radioactifs) sur le site de Bure dans l\u2019Est de la France \u00e0 la fin des ann\u00e9es 1990. Ces structures pourraient influencer les \u00e9coulements dans l\u2019aquif\u00e8re jurassique sous-jacent aux argiles callovo-oxfordiennes, o\u00f9 l\u2019Andra \u00e9tudie la faisabilit\u00e9 de stockage profond de d\u00e9chets radioactifs dans son laboratoire sous-terrain. Des exemples similaires de cr\u00eates carbonat\u00e9es ont \u00e9t\u00e9 observ\u00e9s ailleurs dans le monde, mais, comme sur le site de Bure, leur origine reste mal comprise. Une \u00e9tude multidisciplinaire a \u00e9t\u00e9 men\u00e9e, combinant diagraphies de puits, nouvelles donn\u00e9es sismiques 3D, observations de terrain, et m\u00e9thodes de g\u00e9ophysique de surface (radar, r\u00e9sistivit\u00e9 \u00e9lectrique et sismique de r\u00e9fraction).<\/p>\n\n\n\n<p>Les r\u00e9sultats montrent que des r\u00e9cifs coralliens scl\u00e9ractiniaires se sont d\u00e9velopp\u00e9s au Bajocien inf\u00e9rieur, dans des eaux peu profondes, chaudes et pauvres en nutriments. Ces r\u00e9cifs se sont \u00e9rig\u00e9s sur le sommet de dunes sous-marines g\u00e9antes oolithiques et bioclastiques (une dizaine de m\u00e8tres de hauteur). Les sommets de ces dunes ont \u00e9t\u00e9 soumis \u00e0 un ph\u00e9nom\u00e8ne de diagen\u00e8se marine pr\u00e9coce ayant ciment\u00e9 et indur\u00e9 les dunes. Ces substrats durs ont servi de base solide et stable pour la croissance des r\u00e9cifs. Les cartes sismiques plus r\u00e9centes et couvrant une plus grande surface que la sismique initiale, montrent des formes r\u00e9cifales moins rectilignes, plus complexes, de quelques dizaines \u00e0 centaines de m\u00e8tres de largeur et d\u2019extension pluri-kilom\u00e9triques, s\u2019alignant selon une direction globale N120\u00b0. Certaines structures atteignent 15 m de hauteur. Ces r\u00e9cifs sont recouverts par des d\u00e9p\u00f4ts riches en onco\u00efdes, traduisant une \u00e9volution vers des conditions m\u00e9sotrophes li\u00e9es \u00e0 une mont\u00e9e du niveau marin.<\/p>\n\n\n\n<p>La g\u00e9ophysique de surface a permis d\u2019imager les \u00ab&nbsp;racines&nbsp;\u00bb des r\u00e9cifs, \u00e0 savoir les dunes g\u00e9antes, leurs structures internes et le remplissage des zones inter-r\u00e9cifales. Cette \u00e9tude souligne l\u2019importance des analogues d\u2019affleurement pour interpr\u00e9ter les donn\u00e9es du sous-sol et montre l\u2019apport d\u00e9cisif des m\u00e9thodes g\u00e9ophysiques pour compl\u00e9ter les observations de terrain. Elle propose un nouveau mod\u00e8le pour la gen\u00e8se des cr\u00eates r\u00e9cifales.<\/p>\n\n\n\n<p>Source&nbsp;: Brigaud, B., Vincent, B., Pessel, M., Saintenoy, A., Zeyen, H., Durlet, C., Sa\u00efag, J., Hayet, M., 2025. Imaging Bajocian Coral Ridges in the Paris Basin and Deciphering Their Origin. Basin Research, 37, e70034 <a href=\"https:\/\/doi.org\/10.1111\/bre.70034\">https:\/\/doi.org\/10.1111\/bre.70034<\/a><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"455\" height=\"327\" src=\"http:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/image-4.jpeg\" alt=\"\" class=\"wp-image-3464\" srcset=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/image-4.jpeg 455w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/image-4-300x216.jpeg 300w\" sizes=\"auto, (max-width: 455px) 100vw, 455px\" \/><\/figure>\n\n\n\n<p><strong>Illustration d\u2019un profil sismique dans la carri\u00e8re de Sommer\u00e9court (Haute-Marne). @Benjamin Brigaud<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"357\" src=\"http:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/image-5-1024x357.jpeg\" alt=\"\" class=\"wp-image-3466\" srcset=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/image-5-1024x357.jpeg 1024w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/image-5-300x105.jpeg 300w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/image-5-768x268.jpeg 768w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/image-5-1536x536.jpeg 1536w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/image-5-2048x715.jpeg 2048w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/image-5-676x236.jpeg 676w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><strong>Coupe stratigraphique de la carri\u00e8re de Rouvres-la-Ch\u00e9tive illustrant les dunes et l\u2019implantation des coraux <\/strong><strong>@Benjamin Brigaud<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"http:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/image-6-1024x768.jpeg\" alt=\"\" class=\"wp-image-3467\" srcset=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/image-6-1024x768.jpeg 1024w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/image-6-300x225.jpeg 300w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/image-6-768x576.jpeg 768w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/image-6-1536x1152.jpeg 1536w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/image-6-2048x1536.jpeg 2048w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/image-6-676x507.jpeg 676w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><strong>Acquisition d\u2019un profil sismique dans la zone du futur possible centre de stockage des d\u00e9chets radioactifs en couches g\u00e9ologiques profondes <\/strong><strong>@Benjamin Brigaud<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Des cr\u00eates \u00e9nigmatiques, large de quelques dizaines de m\u00e8tres et tr\u00e8s rectilignes, orient\u00e9es N120\u00b0 avait \u00e9t\u00e9 identifi\u00e9es dans les calcaires bajociens du Bassin de Paris gr\u00e2ce \u00e0 l\u2019imagerie sismique 3D effectu\u00e9es lors des toutes premi\u00e8res prospections g\u00e9ologiques men\u00e9es par l\u2019Andra (Agence nationale pour la gestion des d\u00e9chets radioactifs) sur le site de Bure dans l\u2019Est [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3464,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[270],"tags":[],"class_list":["post-3463","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-classe-fr","post-preview"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>L\u2019\u00e9nigmatique alignement N120\u00b0 des r\u00e9cifs coralliens jurassiques de l\u2019Est de la France r\u00e9solu - 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\/3463-2\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" 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