{"id":2354,"date":"2017-06-03T07:19:37","date_gmt":"2017-06-03T07:19:37","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/?p=2354"},"modified":"2017-06-03T07:30:34","modified_gmt":"2017-06-03T07:30:34","slug":"filons-volcaniques-tchad","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2017\/06\/03\/filons-volcaniques-tchad\/","title":{"rendered":"Filons volcaniques au Tchad"},"content":{"rendered":"

Une \u00e9tude portant sur un r\u00e9seau de filons volcaniques (appel\u00e9s dykes, voir mon blog des 4\/1\/2014, 6\/6\/2015, 11\/6\/2015) vient d\u2018\u00eatre publi\u00e9e dans la revue \u00ab\u00a0Open Geosciences\u00a0\u00bb\u00a0:<\/p>\n

Nkouandou O.F., Bardintzeff J.M., Mahamat O., Fagny Mefire A. et Ganwa A.A. (2017) – The dolerite dyke swarm of Mongo, Gu\u00e9ra Massif (Chad, Central Africa): Geological setting, petrography and geochemistry. Open Geosciences, 9, 1, 138-150.<\/p>\n

\"\"<\/p>\n

Un dyke basaltique sombre (largeur = 65 cm) dans un encaissant clair (\u201ecountry rock\u201c = granite du massif de Gu\u00e9ra) dans la r\u00e9gion de Mongo au Tchad.<\/p>\n

Ces dykes mesurent plusieurs centaines de m\u00e8tres \u00e0 plusieurs kilom\u00e8tres de longueur, pour une largeur de plusieurs dizaines de centim\u00e8tres jusqu\u2019\u00e0 dix m\u00e8tres.<\/p>\n

Les roches pr\u00e9sentent une structure microgrenue, dol\u00e9ritique (cristaux de tailles diff\u00e9rentes), typique des filons d\u2019alimentation.<\/p>\n

Deux groupes se distinguent selon leurs compositions chimiques\u00a0: le Groupe 1 comprend des basaltes et des trachybasaltes (48,3 – 51,2 % SiO2<\/sub>, 2,5 – 3,7 % TiO2<\/sub>), alors que le Groupe 2 est form\u00e9 par des trachyand\u00e9sites basaltiques (52,1 – 55,1 % SiO2<\/sub>, 1,8 – 2,7 % TiO2<\/sub>). L\u2019ensemble constitue une s\u00e9rie d\u2019affinit\u00e9 thol\u00e9iitique continentale l\u00e9g\u00e8rement diff\u00e9renci\u00e9e.<\/p>\n

Cet essaim de dykes se serait mis en place \u00e0 la fin de l\u2019orogen\u00e8se Pan-Africaine, il y a environ 500 millions d\u2019ann\u00e9es.<\/p>\n

Pour consulter cette publication :<\/p>\n

https:\/\/www.academia.edu\/33288800\/The_dolerite_dyke_swarm_of_Mongo_Gu%C3%A9ra_Massif_Chad_Central_Africa_Geological_setting_petrography_and_geochemistry<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Une \u00e9tude portant sur un r\u00e9seau de filons volcaniques (appel\u00e9s dykes, voir mon blog des 4\/1\/2014, 6\/6\/2015, 11\/6\/2015) vient d\u2018\u00eatre publi\u00e9e dans la revue \u00ab\u00a0Open Geosciences\u00a0\u00bb\u00a0: Nkouandou O.F., Bardintzeff J.M., Mahamat O., Fagny Mefire A. et Ganwa A.A. (2017) – The dolerite dyke swarm of Mongo, Gu\u00e9ra Massif (Chad, Central Africa): Geological setting, petrography and … Continuer la lecture de Filons volcaniques au Tchad<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[6],"tags":[21,852,853,180,854,855,856,857,858,859,860,861,862,864,863],"class_list":["post-2354","post","type-post","status-publish","format-standard","hentry","category-actualites","tag-bardintzeff","tag-basalte","tag-dolerite","tag-dyke","tag-fagny-mefire","tag-filon","tag-ganwa","tag-guera","tag-mahamat","tag-mongo","tag-nkouandou","tag-tchad","tag-tholeiite","tag-trachyandesite","tag-trachybasalte"],"yoast_head":"\nFilons volcaniques au Tchad, par Jacques-Marie Bardintzeff<\/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:\/\/blogs.futura-sciences.com\/bardintzeff\/2017\/06\/03\/filons-volcaniques-tchad\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Filons volcaniques au Tchad, par Jacques-Marie Bardintzeff\" \/>\n<meta property=\"og:description\" content=\"Une \u00e9tude portant sur un r\u00e9seau de filons volcaniques (appel\u00e9s dykes, voir mon blog des 4\/1\/2014, 6\/6\/2015, 11\/6\/2015) vient d\u2018\u00eatre publi\u00e9e dans la revue \u00ab\u00a0Open Geosciences\u00a0\u00bb\u00a0: Nkouandou O.F., Bardintzeff J.M., Mahamat O., Fagny Mefire A. et Ganwa A.A. 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