{"id":687,"date":"2011-12-29T08:16:33","date_gmt":"2011-12-29T08:16:33","guid":{"rendered":"http:\/\/hebergement.u-psud.fr\/brigaud\/?p=687"},"modified":"2013-08-20T21:28:32","modified_gmt":"2013-08-20T21:28:32","slug":"687","status":"publish","type":"post","link":"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/687\/","title":{"rendered":"ASF &#8211; Dijon, 2011"},"content":{"rendered":"<p><a href=\"http:\/\/hebergement.u-psud.fr\/brigaud\/wp-admin\/uploads\/logoasf.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-690\" alt=\"logoasf\" src=\"http:\/\/hebergement.u-psud.fr\/brigaud\/wp-admin\/uploads\/logoasf.jpg\" width=\"90\" height=\"68\" \/><\/a>Les r\u00e9sultats des \u00e9tudes intitul\u00e9es \u00ab\u00a0Observations s\u00e9dimentologiques et diag\u00e9n\u00e9tiques des min\u00e9ralisations de fluorine (CaF2) sur la bordure sud-est du Bassin de Paris (Morvan, France) [<a href=\"http:\/\/hebergement.u-psud.fr\/brigaud\/wp-admin\/uploads\/ASF2011_Brigaud_CaF2.pdf\" target=\"_blank\">PDF<\/a>]\u00a0\u00bb\u00a0 et \u00ab\u00a0S\u00e9dimentologie, architecture stratigraphique et diagen\u00e8se des formations purbeckiennes de l\u2019Est du Bassin de Paris (transition Jurassique\/Cr\u00e9tac\u00e9, Haute-Marne, France) [<a href=\"http:\/\/hebergement.u-psud.fr\/brigaud\/wp-admin\/uploads\/ASF2011_Brigaud_purbec.pdf\" target=\"_blank\">PDF<\/a>]\u00a0\u00bb ont \u00e9t\u00e9 pr\u00e9sent\u00e9es lors du 13\u00e8me Congr\u00e8s Fran\u00e7ais de S\u00e9dimentologie \u00e0 Dijon.<\/p>\n<p>&nbsp;<\/p>\n<p>R\u00e9sum\u00e9s:<\/p>\n<p><strong>Observations s\u00e9dimentologiques et diag\u00e9n\u00e9tiques des min\u00e9ralisations de fluorine (CaF<sub>2<\/sub>) sur la bordure Sud-Est du Bassin de Paris (Morvan, France) <\/strong><\/p>\n<p>L\u2019objectif principal de cette \u00e9tude est d\u2019examiner les gisements stratiformes de fluorine de la bordure Sud-Est du Bassin de Paris et d\u2019essayer de comprendre et conceptualiser leur origine.<\/p>\n<p>L\u2019approche s\u00e9dimentologique et diag\u00e9n\u00e9tique permet de mieux comprendre la part de l\u2019histoire s\u00e9dimentaire et diag\u00e9n\u00e9tique dans la formation de ces gisements et de pr\u00e9ciser le fonctionnement des syst\u00e8mes pal\u00e9o-hydrologiques du Bassin de Paris.<\/p>\n<p>Ce travail pr\u00e9sente les r\u00e9sultats pr\u00e9liminaires s\u00e9dimentologiques, diag\u00e9n\u00e9tiques et g\u00e9ochimiques obtenus sur un des gisements du Plateau d\u2019Antully (Le Marquisat, Sa\u00f4ne-et-Loire). L\u2019\u00e9tude s\u00e9dimentologique a permis de mettre en \u00e9vidence un syst\u00e8me s\u00e9dimentaire fluviatile en tresse, comme processus de d\u00e9p\u00f4t des sables formant les gr\u00e8s d\u2019Antully. Les barres sableuses constituent ainsi des corps s\u00e9dimentaires tr\u00e8s poreux pouvant laisser la place au d\u00e9veloppement de min\u00e9ralisations.<\/p>\n<p>L\u2019\u00e9tude p\u00e9trographique en cathodoluminescence et au MEB a permis de mettre en \u00e9vidence une quinzaine de phases de min\u00e9ralisations dans ce gisement. Une premi\u00e8re phase de silicification (Q1) se d\u00e9veloppe en surcroissance \u00e0 partir des grains de quartz d\u00e9tritiques. Ensuite, une premi\u00e8re phase de fluorine (F1) se d\u00e9veloppe de mani\u00e8re tr\u00e8s limit\u00e9e en terme de volume. D\u2019une teinte violac\u00e9e, elle pr\u00e9sente des cristaux de plusieurs dizaines de microm\u00e9triques. En continuit\u00e9 de F1, une deuxi\u00e8me g\u00e9n\u00e9ration de fluorine (F2) pr\u00e9sente des teintes bleut\u00e9es en cathodoluminescence et appara\u00eet anh\u00e9drale. La limite ext\u00e9rieure de F2 est irr\u00e9guli\u00e8re, cr\u00e9nel\u00e9e et son contact avec les cristaux post\u00e9rieurs n\u2019est pas net, marquant une dissolution. Cette phase de dissolution est associ\u00e9e \u00e0 une cristallisation de calcite. Une troisi\u00e8me g\u00e9n\u00e9ration de fluorine (F3) appara\u00eet tr\u00e8s zon\u00e9e en cathodoluminescence, avec des teintes variant du violet, au gris, et pr\u00e9sentant des cristaux de taille pouvant atteindre 200\u00b5m. Une deuxi\u00e8me phase de silicification (Q2) appara\u00eet rouge et zon\u00e9e en cathodoluminescence. Elle est suivie par une quatri\u00e8me phase de fluorine, tr\u00e8s zon\u00e9e \u00e9galement. La porosit\u00e9 r\u00e9siduelle est colmat\u00e9e par une cinqui\u00e8me phase anh\u00e9drale de fluorine (F5), apparaissant tr\u00e8s bleue en cathodoluminescence. Une sixi\u00e8me phase (F6) se d\u00e9veloppe dans des fractures\/ou fissures parall\u00e8les \u00e0 la stratification et forment des ph\u00e9nocristaux de taille pluri-centim\u00e8trique. Des microcristaux de pyrite (FeS<sub>2<\/sub>), sphal\u00e9rite (ZnS), gal\u00e8ne (PbS) et barytine (BaSO<sub>4<\/sub>) sont associ\u00e9es aux phases de fluorine. Des analyses g\u00e9ochimiques sont en cours d\u2019acquisition (LA-ICP-MS \u2013 <i>Laser Ablation Inductively Coupled Plasma Mass Spectrometry<\/i>) et devront permettre de caract\u00e9riser les spectres de terres rares des diff\u00e9rentes g\u00e9n\u00e9rations.<\/p>\n<p style=\"text-align: justify;\"><strong>S\u00e9dimentologie, architecture stratigraphique et diagen\u00e8se des formations purbeckiennes de l\u2019Est du Bassin de Paris (Transition Jurassique\/Cr\u00e9tac\u00e9, Haute-Marne, France)<\/strong><\/p>\n<p style=\"text-align: justify;\">Une \u00e9tude couplant la s\u00e9dimentologie de faci\u00e8s, la stratigraphie s\u00e9quentielle, la g\u00e9ochimie isotopique et la diagen\u00e8se a \u00e9t\u00e9 r\u00e9alis\u00e9e sur les formations purbeckiennes de l\u2019Est du Bassin de Paris. Les objectifs sont de (1) pr\u00e9ciser le timing des changements pal\u00e9o-environnementaux s\u2019op\u00e9rant durant cette p\u00e9riode, de (2) contraindre l\u2019architecture stratigraphique de ces formations s\u00e9dimentaires et de (3) proposer une paragen\u00e8se min\u00e9rale de cette s\u00e9rie. Les observations d\u2019affleurements, localis\u00e9s en Haute-Marne entre Joinville et Saint-Dizier, ainsi que les observations microscopiques illustrent 13 faci\u00e8s ou microfaci\u00e8s pouvant \u00eatre regroup\u00e9s en 7 associations de faci\u00e8s (F1 \u00e0 F7) caract\u00e9ristiques de 7 environnements de d\u00e9p\u00f4ts. Ces microfaci\u00e8s se disposent sur une rampe mixte carbonat\u00e9e, \u00e9vaporitique et silicoclastique. Les d\u00e9p\u00f4ts caract\u00e9ristiques des associations F1, F2 et F3 sont carbonat\u00e9s, allant d\u2019alternances marno-calcaires d\u2019offshore inf\u00e9rieur \u00e0 des calcaires grainstones \u00e0 oolites d\u2019environnements de shoreface. F4 et F5 sont caract\u00e9ristiques de milieux intertidaux et de lagon. L\u2019association F6 est caract\u00e9ris\u00e9e par des faci\u00e8s dolomitiques, \u00e9vaporitiques (anhydrite) et argileux caract\u00e9risant un milieu restreint de type sabkha. F7 pr\u00e9sente des faci\u00e8s sableux ou des argiles riches en mati\u00e8re organique se d\u00e9posant dans un environnement fluvio-delta\u00efque. L\u2019\u00e9tude s\u00e9quentielle met en \u00e9vidence 8 s\u00e9quences stratigraphiques dont 4 remplissent une pal\u00e9o-d\u00e9pression. La 8<sup>\u00e8me<\/sup> s\u00e9quence, marqu\u00e9e par la pr\u00e9sence des chenaux et des faci\u00e8s sableux, incisent clairement toutes les pr\u00e9c\u00e9dentes s\u00e9quences. Les observations des phases min\u00e9rales montrent 7 stades successifs de cimentation (4 phases calcitiques, 1 phase de dolomitisation, 1 phase de silicification et 1 phase de fluorine). Dans le faci\u00e8s oolitiques, apr\u00e8s un stade de dissolution, une phase pr\u00e9coce de cimentation calcitique formant des scal\u00e9no\u00e8dres semble caract\u00e9ristique d\u2019une cristallisation en milieu m\u00e9t\u00e9orique. Les analyses isotopiques (\u03b4<sup>13<\/sup>C) effectu\u00e9es dans ces faci\u00e8s oolitiques (F3) enregistrent une diagen\u00e8se en zone m\u00e9t\u00e9orique phr\u00e9atique et confirment l\u2019intrusion de fluides m\u00e9t\u00e9oriques. La calcite des faci\u00e8s d\u2019environnements de sabkha (F6) montre des valeurs \u03b4<sup>18<\/sup>O tr\u00e8s positives, confirmant le confinement de ce milieu lors de la pr\u00e9cipitation des carbonates. Cette \u00e9tude permet d\u2019illustrer la grande variabilit\u00e9 des faci\u00e8s \u00e0 la transition Jurassique\/Cr\u00e9tac\u00e9 dans l\u2019Est du Bassin de Paris. Une pal\u00e9o-d\u00e9pression assimilable \u00e0 un synclinal se remplissant par de s\u00e9diments carbonat\u00e9s et \u00e9vaporitiques semble se former \u00e0 la fin du Jurassique. Une tendance \u00e0 la continentalisation est perceptible \u00e0 la transition Jurassique\/Cr\u00e9tac\u00e9 et permet la mise en place de circulations m\u00e9t\u00e9oriques dans le sommet de la pile s\u00e9dimentaire du Jurassique, responsable de la dissolution partielle des oolites et bioclastes et de la cristallisation des ciments scal\u00e9no\u00e9draux.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les r\u00e9sultats des \u00e9tudes intitul\u00e9es \u00ab\u00a0Observations s\u00e9dimentologiques et diag\u00e9n\u00e9tiques des min\u00e9ralisations de fluorine (CaF2) sur la bordure sud-est du Bassin de Paris (Morvan, France) [PDF]\u00a0\u00bb\u00a0 et \u00ab\u00a0S\u00e9dimentologie, architecture stratigraphique et diagen\u00e8se des formations purbeckiennes de l\u2019Est du Bassin de Paris (transition Jurassique\/Cr\u00e9tac\u00e9, Haute-Marne, France) [PDF]\u00a0\u00bb ont \u00e9t\u00e9 pr\u00e9sent\u00e9es lors du 13\u00e8me Congr\u00e8s Fran\u00e7ais de S\u00e9dimentologie [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":690,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"gallery","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[38,53,106,39,34,110,40,104],"tags":[60,27,8,103,21,7],"class_list":["post-687","post","type-post","status-publish","format-gallery","has-post-thumbnail","hentry","category-bassin","category-bassin-de-paris-2","category-carbonate","category-diagenese","category-fluorine","category-jurassique","category-metallogenie","category-sedimentologie","tag-asf","tag-bassin-de-paris","tag-carbonate","tag-fluorine","tag-jurassique","tag-sedimentologie","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>ASF - Dijon, 2011 - 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\/687\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ASF - Dijon, 2011 - benjamin brigaud\" \/>\n<meta property=\"og:description\" content=\"Les r\u00e9sultats des \u00e9tudes intitul\u00e9es \u00ab\u00a0Observations s\u00e9dimentologiques et diag\u00e9n\u00e9tiques des min\u00e9ralisations de fluorine (CaF2) sur la bordure sud-est du Bassin de Paris (Morvan, France) [PDF]\u00a0\u00bb\u00a0 et \u00ab\u00a0S\u00e9dimentologie, architecture stratigraphique et diagen\u00e8se des formations purbeckiennes de l\u2019Est du Bassin de Paris (transition Jurassique\/Cr\u00e9tac\u00e9, Haute-Marne, France) [PDF]\u00a0\u00bb ont \u00e9t\u00e9 pr\u00e9sent\u00e9es lors du 13\u00e8me Congr\u00e8s Fran\u00e7ais de S\u00e9dimentologie [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/687\/\" \/>\n<meta property=\"og:site_name\" content=\"benjamin brigaud\" \/>\n<meta property=\"article:published_time\" content=\"2011-12-29T08:16:33+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2013-08-20T21:28:32+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/wp-admin\/uploads\/logoasf.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"144\" \/>\n\t<meta property=\"og:image:height\" content=\"108\" \/>\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=\"5 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\/687\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/687\/\"},\"author\":{\"name\":\"admin\",\"@id\":\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/#\/schema\/person\/ba21190868a7ac9148ff1dc91cfeb6ac\"},\"headline\":\"ASF &#8211; 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