{"id":1194,"date":"2014-03-10T07:24:12","date_gmt":"2014-03-10T07:24:12","guid":{"rendered":"http:\/\/hebergement.u-psud.fr\/brigaud\/?p=1194"},"modified":"2014-08-26T07:57:12","modified_gmt":"2014-08-26T07:57:12","slug":"terrain-dans-lyonne-agups","status":"publish","type":"post","link":"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/terrain-dans-lyonne-agups\/","title":{"rendered":"Terrain dans l\u2019Yonne \u2013 AGUPS"},"content":{"rendered":"<p style=\"text-align: justify;\">Dans le cadre d\u2019une sortie pour l\u2019Association des G\u00e9ologues de l\u2019Universit\u00e9 Paris-Sud (AGUPS), j\u2019ai conduit les membres de l\u2019association dans l\u2019Yonne sur les affleurements du Jurassique sup\u00e9rieur de la vall\u00e9e de l\u2019Yonne et sur l\u2019affleurement du gisement de fluorine de Pierre-Perthuis.<\/p>\n\n\t\t<style type=\"text\/css\">\n\t\t\t#gallery-1 {\n\t\t\t\tmargin: auto;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-item {\n\t\t\t\tfloat: left;\n\t\t\t\tmargin-top: 10px;\n\t\t\t\ttext-align: center;\n\t\t\t\twidth: 33%;\n\t\t\t}\n\t\t\t#gallery-1 img {\n\t\t\t\tborder: 2px solid #cfcfcf;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-caption {\n\t\t\t\tmargin-left: 0;\n\t\t\t}\n\t\t\t\/* see gallery_shortcode() in wp-includes\/media.php *\/\n\t\t<\/style>\n\t\t<div id='gallery-1' class='gallery galleryid-1194 gallery-columns-3 gallery-size-thumbnail'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/terrain-dans-lyonne-agups\/img_6234\/'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/IMG_6234-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" aria-describedby=\"gallery-1-1195\" srcset=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/IMG_6234-150x150.jpg 150w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/IMG_6234-144x144.jpg 144w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-1195'>\n\t\t\t\tRocher du Saussois &#8211; Oxfordien\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/terrain-dans-lyonne-agups\/pano\/'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/pano-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" aria-describedby=\"gallery-1-1199\" srcset=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/pano-150x150.jpg 150w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/pano-144x144.jpg 144w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-1199'>\n\t\t\t\tRocher du Saussois &#8211; Oxfordien\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/terrain-dans-lyonne-agups\/img_6256\/'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/IMG_6256-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" aria-describedby=\"gallery-1-1197\" srcset=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/IMG_6256-150x150.jpg 150w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/IMG_6256-144x144.jpg 144w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-1197'>\n\t\t\t\tLa roche aux poulets &#8211; Oxfordien\n\t\t\t\t<\/dd><\/dl><br style=\"clear: both\" \/><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon portrait'>\n\t\t\t\t<a href='https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/terrain-dans-lyonne-agups\/img_6258\/'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/IMG_6258-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" aria-describedby=\"gallery-1-1198\" srcset=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/IMG_6258-150x150.jpg 150w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/IMG_6258-144x144.jpg 144w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-1198'>\n\t\t\t\tLa roche aux poulets &#8211; Oxfordien\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/terrain-dans-lyonne-agups\/img_6281\/'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/IMG_6281-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" aria-describedby=\"gallery-1-1201\" srcset=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/IMG_6281-150x150.jpg 150w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/IMG_6281-144x144.jpg 144w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-1201'>\n\t\t\t\tLa roche perc\u00e9e \u00e0 Pierre-Perthuis &#8211; min\u00e9ralisation de fluorine\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/terrain-dans-lyonne-agups\/img_6296\/'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/IMG_6296-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" aria-describedby=\"gallery-1-1200\" srcset=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/IMG_6296-150x150.jpg 150w, https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/IMG_6296-144x144.jpg 144w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-1200'>\n\t\t\t\tMin\u00e9ralisation de fluorine &#8211; Pierre-Perthuis\n\t\t\t\t<\/dd><\/dl><br style=\"clear: both\" \/>\n\t\t<\/div>\n\n<p style=\"text-align: justify;\">Le Jurassique est connu comme \u00e9tant une p\u00e9riode tr\u00e8s favorable pour le d\u00e9veloppement de plateformes carbonat\u00e9es dans les bassins ouest-t\u00e9thysiens. De nombreuses \u00e9tudes ont \u00e9t\u00e9 men\u00e9es dans divers bassins intracratoniques en France, Espagne, Angleterre, Allemagne, Pologne, Suisse ou encore Egypte, permettant d\u2019avoir un cadre biostratigraphique bien contraint. N\u00e9anmoins, la part relative des diff\u00e9rents facteurs de contr\u00f4le (eustatisme, tectonique, chimie de l\u2019oc\u00e9an ou climat) sur le d\u00e9veloppement des syst\u00e8mes carbonat\u00e9s dans ces bassins demeure compliqu\u00e9e \u00e0 mettre en \u00e9vidence. Dans le contexte actuel de changements environnementaux li\u00e9s aux activit\u00e9s anthropiques (relargage de CO2, d\u00e9forestation, pollution\u2026), il convient de mieux comprendre l\u2019\u00e9volution et le fonctionnement de certains \u00e9cosyst\u00e8mes tr\u00e8s riches comme les lagons et r\u00e9cifs coralliens des mers subtropicales. En effet, ces \u00e9cosyst\u00e8mes de lagons et plus largement ceux des plateformes carbonat\u00e9es peu profondes peuvent \u00eatre particuli\u00e8rement sensibles aux effets directs de ces activit\u00e9s anthropiques comme le r\u00e9chauffement climatique, la hausse du niveau marin, l\u2019acidification des eaux de surface, l\u2019augmentation du relargage de particules fines (boue). Les carbonates du Jurassique sup\u00e9rieur sont un tr\u00e8s bon exemple pour \u00e9tudier et discuter les facteurs contr\u00f4lant la formation d\u2019une plateforme carbonat\u00e9e car ils permettent d\u2019observer les faci\u00e8s depuis sa partie distale jusqu\u2019au lagon, en passant par les faci\u00e8s bioconstruits.<br \/>\nPar ailleurs, les formations carbonat\u00e9es pr\u00e9sentent un int\u00e9r\u00eat \u00e9conomique et soci\u00e9tal non n\u00e9gligeable dans le monde car ces formations portent d\u2019importantes r\u00e9serves de p\u00e9trole au Moyen-Orient, ou ailleurs dans le monde, ce qui suscite beaucoup d\u2019\u00e9tudes d\u2019explorations.<br \/>\nDans le Bassin de Paris, les carbonates du Jurassique forment les encaissants d\u2019une couche argileuse dans laquelle l\u2019Andra (Agence nationale pour la gestion des d\u00e9chets radioactifs) projette la r\u00e9alisation d\u2019un stockage de d\u00e9chets radioactifs \u00e0 l\u2019horizon 2025. En r\u00e9gion parisienne, dans l\u2019Aube ou dans la Marne, les carbonates du Jurassique sont actuellement \u00e9tudi\u00e9s pour leur potentiel g\u00e9othermique ou comme cible possible pour la s\u00e9questration de CO2, et constituent donc un r\u00e9servoir p\u00e9trolier. Les affleurements du Jurassique sup\u00e9rieur de l\u2019Yonne constitue ainsi un analogue de r\u00e9servoir p\u00e9trolier, tr\u00e8s p\u00e9dagogique \u00e0 \u00e9tudier aussi bien d\u2019un point de vue acad\u00e9mique qu\u2019appliqu\u00e9.<\/p>\n<p style=\"text-align: justify;\">Le gisement de fluorine de Pierre-Perthuis dans l\u2019Yonne forme une des plus importantes r\u00e9serves de CaF<sub>2<\/sub> au monde, avec une r\u00e9serve estim\u00e9e \u00e0 1,4 Million de tonnes. Comme la fluorine est le principal min\u00e9ral contenant du Fluor, et que le Fluor se trouve parmi la vingtaine de substances chimiques class\u00e9es comme \u00e9tant strat\u00e9gique* par l\u2019union europ\u00e9enne, ce gisement se trouve \u00eatre un objet int\u00e9ressant \u00e0 pr\u00e9senter aux \u00e9tudiants. Il est \u00e0 noter que d\u2019un point de vue acad\u00e9mique, une collaboration entre l\u2019Universit\u00e9 Paris-Sud et le brgm est en cours afin de contraindre la p\u00e9riode de mise en place de ces s\u00e9diments d\u2019\u00e2ge triasique. D\u2019une mani\u00e8re p\u00e9dagogique, la pr\u00e9sence de plusieurs g\u00e9n\u00e9rations de baryte, quartz, carbonate de cuivre ou de fluorine permet d\u2019initier les \u00e9tudiants \u00e0 l\u2019\u00e9laboration d\u2019une paragen\u00e8se min\u00e9rale sur le terrain.<\/p>\n<p style=\"text-align: justify;\">*<em>La fluorine est une substance de base pour la fabrication de l\u2019acide fluorhydrique, utilis\u00e9 couramment dans l\u2019industrie comme r\u00e9actif de purification de l&rsquo;aluminium et de l&rsquo;uranium, pour \u00e9liminer des impuret\u00e9s oxyd\u00e9es de l&rsquo;acier inoxydable ou les oxydes \u00e0 la surface du silicium dans l&rsquo;industrie des semi-conducteurs, pour attaquer le verre ou comme catalyseur de certaines r\u00e9actions dans le raffinage du p\u00e9trole. Il est \u00e9galement utilis\u00e9 pour la fabrication de compos\u00e9s organiques contenant du fluor, comme le t\u00e9flon ou les gaz utilis\u00e9s en r\u00e9frig\u00e9ration comme le fr\u00e9on.<\/em><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dans le cadre d\u2019une sortie pour l\u2019Association des G\u00e9ologues de l\u2019Universit\u00e9 Paris-Sud (AGUPS), j\u2019ai conduit les membres de l\u2019association dans l\u2019Yonne sur les affleurements du Jurassique sup\u00e9rieur de la vall\u00e9e de l\u2019Yonne et sur l\u2019affleurement du gisement de fluorine de Pierre-Perthuis. Le Jurassique est connu comme \u00e9tant une p\u00e9riode tr\u00e8s favorable pour le d\u00e9veloppement de [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1195,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"gallery","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[14],"tags":[8,103,7,96],"class_list":["post-1194","post","type-post","status-publish","format-gallery","has-post-thumbnail","hentry","category-terrain-2","tag-carbonate","tag-fluorine","tag-sedimentologie","tag-yonne","post_format-post-format-gallery","post-preview"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Terrain dans l\u2019Yonne \u2013 AGUPS - 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\/terrain-dans-lyonne-agups\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Terrain dans l\u2019Yonne \u2013 AGUPS - benjamin brigaud\" \/>\n<meta property=\"og:description\" content=\"Dans le cadre d\u2019une sortie pour l\u2019Association des G\u00e9ologues de l\u2019Universit\u00e9 Paris-Sud (AGUPS), j\u2019ai conduit les membres de l\u2019association dans l\u2019Yonne sur les affleurements du Jurassique sup\u00e9rieur de la vall\u00e9e de l\u2019Yonne et sur l\u2019affleurement du gisement de fluorine de Pierre-Perthuis. Le Jurassique est connu comme \u00e9tant une p\u00e9riode tr\u00e8s favorable pour le d\u00e9veloppement de [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/terrain-dans-lyonne-agups\/\" \/>\n<meta property=\"og:site_name\" content=\"benjamin brigaud\" \/>\n<meta property=\"article:published_time\" content=\"2014-03-10T07:24:12+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2014-08-26T07:57:12+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/IMG_6234.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1936\" \/>\n\t<meta property=\"og:image:height\" content=\"1288\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/terrain-dans-lyonne-agups\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/terrain-dans-lyonne-agups\/\"},\"author\":{\"name\":\"admin\",\"@id\":\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/#\/schema\/person\/ba21190868a7ac9148ff1dc91cfeb6ac\"},\"headline\":\"Terrain dans l\u2019Yonne \u2013 AGUPS\",\"datePublished\":\"2014-03-10T07:24:12+00:00\",\"dateModified\":\"2014-08-26T07:57:12+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/terrain-dans-lyonne-agups\/\"},\"wordCount\":726,\"publisher\":{\"@id\":\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/#organization\"},\"image\":{\"@id\":\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/terrain-dans-lyonne-agups\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/IMG_6234.jpg\",\"keywords\":[\"carbonate\",\"Fluorine\",\"s\u00e9dimentologie\",\"Yonne\"],\"articleSection\":[\"Terrain\"],\"inLanguage\":\"fr-FR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/terrain-dans-lyonne-agups\/\",\"url\":\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/terrain-dans-lyonne-agups\/\",\"name\":\"Terrain dans l\u2019Yonne \u2013 AGUPS - 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