{"id":2874,"date":"2021-02-17T16:06:04","date_gmt":"2021-02-17T16:06:04","guid":{"rendered":"http:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/?p=2874"},"modified":"2021-06-13T10:32:23","modified_gmt":"2021-06-13T10:32:23","slug":"datation-de-la-diagenese-des-carbonates","status":"publish","type":"post","link":"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/datation-de-la-diagenese-des-carbonates\/","title":{"rendered":"Datation de la diagen\u00e8se des carbonates"},"content":{"rendered":"\n<p>Les accumulations s\u00e9dimentaires sont marqu\u00e9es par de nombreux arr\u00eats de s\u00e9dimentation ou hiatus formant des discontinuit\u00e9s. Sur les plates-formes carbonat\u00e9es marines, les discontinuit\u00e9s de type hardground (ou fond durci) sont marqu\u00e9es par des surfaces lithifi\u00e9es lors d\u2019un processus diag\u00e9n\u00e9tique de cimentation syns\u00e9dimentaire, ce fond \u00e9tant alors perfor\u00e9 par des organismes lithophages comme certains bivalves. Les discontinuit\u00e9s forment d&rsquo;importantes surfaces stratigraphiques qui peuvent \u00eatre utilis\u00e9es \u00e0 l&rsquo;\u00e9chelle du bassin pour corr\u00e9ler les limites des s\u00e9quences stratigraphiques et reconstruire les g\u00e9om\u00e9tries s\u00e9dimentaires. Bien que ces surfaces soient couramment utilis\u00e9es en stratigraphie s\u00e9quentielle, le moment et la dur\u00e9e de leur lithification et de la cristallisation des premiers ciments restent peu explor\u00e9s. Dans cette \u00e9tude, les premiers ciments calcitiques obturant l\u2019espace inter-granulaire des calcaires du Jurassique des bassins de Paris et Aquitain ont \u00e9t\u00e9 dat\u00e9s, directement sur les lames minces d\u2019\u00e9chantillons, par la g\u00e9ochronologie U-Pb. La coh\u00e9rence ou la l\u00e9g\u00e8re d\u00e9viation entre l&rsquo;\u00e2ge des ciments et l&rsquo;\u00e2ge stratigraphique des discontinuit\u00e9s illustre le fait que la cimentation s&rsquo;est produite au d\u00e9but de l&rsquo;histoire diag\u00e9n\u00e9tique. La m\u00e9thode g\u00e9ochronologique in situ permet de dater de tr\u00e8s petits ciments, ici d\u2019une taille inf\u00e9rieure \u00e0 200 microm\u00e8tres. Les \u00e2ges obtenus sur les ciments en dents de chien, (\u00e2ge \u00e0 163.5\u00b16.0 Ma, soit \u00b1 3.7% \u00e0 2\u03c3) et les ciments microstalactitiques (\u00e2ge \u00e0 164.0\u00b19 Ma, \u00b1 5.5% \u00e0 2\u03c3) sont tr\u00e8s coh\u00e9rents avec les \u00e2ges suppos\u00e9s de la s\u00e9dimentation. D\u2019autres \u00e2ges obtenus montrent que la 1\u00e8re cimentation du s\u00e9diment peut se r\u00e9aliser jusqu\u2019\u00e0 20 Ma apr\u00e8s le d\u00e9p\u00f4t. Outre la datation de la diagen\u00e8se, la bonne coh\u00e9rence entre l\u2019\u00e2ge des d\u00e9p\u00f4ts et les \u00e2ges obtenus sur certains ciments sugg\u00e8re que la g\u00e9ochronologie in situ U-Pb sur calcite serait une m\u00e9thode prometteuse pour dater les limites des s\u00e9quences stratigraphiques et affiner, dans le futur, l&rsquo;\u00e9chelle des temps g\u00e9ologiques du Jurassique.<\/p>\n\n\n\n<blockquote class=\"twitter-tweet\"><p dir=\"ltr\" lang=\"fr\"><a href=\"https:\/\/twitter.com\/hashtag\/R%C3%A9sultatScientifique?src=hash&amp;ref_src=twsrc%5Etfw\">#R\u00e9sultatScientifique<\/a><br>Des chercheurs ont r\u00e9ussi \u00e0 dater la diagen\u00e8se des <a href=\"https:\/\/twitter.com\/hashtag\/carbonates?src=hash&amp;ref_src=twsrc%5Etfw\">#carbonates<\/a> par <a href=\"https:\/\/twitter.com\/hashtag\/g%C3%A9ochronologie?src=hash&amp;ref_src=twsrc%5Etfw\">#g\u00e9ochronologie<\/a> U-Pb \u231b\ufe0f<br><br>\u27a1\ufe0f<a href=\"https:\/\/t.co\/YjZpwLheyZ\">https:\/\/t.co\/YjZpwLheyZ<\/a> <a href=\"https:\/\/t.co\/GcA0oso88f\">pic.twitter.com\/GcA0oso88f<\/a><\/p>\u2014 Terre &amp; Univers &#8211; CNRS (@INSU_CNRS) <a href=\"https:\/\/twitter.com\/INSU_CNRS\/status\/1354060623953481728?ref_src=twsrc%5Etfw\">January 26, 2021<\/a><\/blockquote> <script async=\"\" src=\"https:\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script>\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\/Fig-photo-en-coloration-au-microscope-dune-discontinuite\u0301-de-type-hardground-montrant-une-coquille-de-gasteropode-tronque\u0301e-1024x768.png\" alt=\"\" class=\"wp-image-2876\" srcset=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/Fig-photo-en-coloration-au-microscope-dune-discontinuite\u0301-de-type-hardground-montrant-une-coquille-de-gasteropode-tronque\u0301e-1024x768.png 1024w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/Fig-photo-en-coloration-au-microscope-dune-discontinuite\u0301-de-type-hardground-montrant-une-coquille-de-gasteropode-tronque\u0301e-300x225.png 300w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/Fig-photo-en-coloration-au-microscope-dune-discontinuite\u0301-de-type-hardground-montrant-une-coquille-de-gasteropode-tronque\u0301e-768x576.png 768w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/Fig-photo-en-coloration-au-microscope-dune-discontinuite\u0301-de-type-hardground-montrant-une-coquille-de-gasteropode-tronque\u0301e.png 1438w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Photo prise au microscope apr\u00e8s coloration \u00e0 l&rsquo;alizarine et ferricyanure de potassium d&rsquo;une discontinuite\u0301 de type hardground montrant une coquille de gast\u00e9ropode tronque\u0301e (carri\u00e8re des Aucrais, Urville, Calvados). \u00a9 Simon Andrieu<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"883\" src=\"http:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/FigureU-Pb-1024x883.jpg\" alt=\"\" class=\"wp-image-2877\" srcset=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/FigureU-Pb-1024x883.jpg 1024w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/FigureU-Pb-300x259.jpg 300w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/FigureU-Pb-768x662.jpg 768w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/FigureU-Pb-1536x1324.jpg 1536w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/FigureU-Pb-2048x1765.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>A. Vue au microscope \u00e0 cathodoluminesceence, la cimentation calcitique remplissant un vide dans un hardground du Jurassique (carri\u00e8re de S\u00e9grie, Pays de la Loire). B. Graphique isochrone U-Pb pour calculer l\u2019\u00e2ge du ciment, ici 20Ma plus vieux que le d\u00e9p\u00f4t<\/figcaption><\/figure>\n\n\n\n<p>Site web INSU-CNRS<\/p>\n\n\n\n<p><a href=\"https:\/\/www.insu.cnrs.fr\/fr\/cnrsinfo\/datation-de-la-diagenese-des-carbonates?utm_campaign=Newsletter%20de%20l%27Insu&amp;utm_medium=email&amp;utm_source=Revue%20newsletter\">https:\/\/www.insu.cnrs.fr\/fr\/cnrsinfo\/datation-de-la-diagenese-des-carbonates<\/a><\/p>\n\n\n\n<p><br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les accumulations s\u00e9dimentaires sont marqu\u00e9es par de nombreux arr\u00eats de s\u00e9dimentation ou hiatus formant des discontinuit\u00e9s. Sur les plates-formes carbonat\u00e9es marines, les discontinuit\u00e9s de type hardground (ou fond durci) sont marqu\u00e9es par des surfaces lithifi\u00e9es lors d\u2019un processus diag\u00e9n\u00e9tique de cimentation syns\u00e9dimentaire, ce fond \u00e9tant alors perfor\u00e9 par des organismes lithophages comme certains bivalves. Les [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2875,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"aside","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[75],"tags":[8,430,108],"class_list":["post-2874","post","type-post","status-publish","format-aside","has-post-thumbnail","hentry","category-article","tag-carbonate","tag-datation","tag-diagenese","post_format-post-format-aside","post-preview"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Datation de la diagen\u00e8se des carbonates - 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\/datation-de-la-diagenese-des-carbonates\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Datation de la diagen\u00e8se des carbonates - benjamin brigaud\" \/>\n<meta property=\"og:description\" content=\"Les accumulations s\u00e9dimentaires sont marqu\u00e9es par de nombreux arr\u00eats de s\u00e9dimentation ou hiatus formant des discontinuit\u00e9s. Sur les plates-formes carbonat\u00e9es marines, les discontinuit\u00e9s de type hardground (ou fond durci) sont marqu\u00e9es par des surfaces lithifi\u00e9es lors d\u2019un processus diag\u00e9n\u00e9tique de cimentation syns\u00e9dimentaire, ce fond \u00e9tant alors perfor\u00e9 par des organismes lithophages comme certains bivalves. 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