{"id":1580,"date":"2016-09-26T18:18:52","date_gmt":"2016-09-26T18:18:52","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/?p=1580"},"modified":"2016-09-26T18:25:31","modified_gmt":"2016-09-26T18:25:31","slug":"maar-denval-chuquet-genestoux","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2016\/09\/26\/maar-denval-chuquet-genestoux\/","title":{"rendered":"Maar d\u2019Enval et Chuquet Genestoux"},"content":{"rendered":"<p>Retour d\u2019une nouvelle visite volcanologique en Auvergne, avec les \u00e9tudiants de la pr\u00e9paration Capes Sciences de la vie et de la Terre (M1 MEEF) des Universit\u00e9s de Paris-Sud Orsay et de Cergy-Pontoise.<\/p>\n<p>Le maar d\u2019Enval se situe juste au pied du puy de D\u00f4me dans la cha\u00eene des Puys. Sur son bord est, au Chuquet Genestoux, affleurent des retomb\u00e9es typiques de lapilli et bombes basaltiques scoriac\u00e9s, partiellement soud\u00e9s, englobant des enclaves de socle granitique plurid\u00e9cim\u00e9triques.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1582\" src=\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-content\/uploads\/sites\/3\/2016\/09\/Bardintzeff.SAM_8274.Chuquet_Genestoux-450x337.jpg\" alt=\"bardintzeff-sam_8274-chuquet_genestoux\" width=\"450\" height=\"337\" srcset=\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-content\/uploads\/sites\/3\/2016\/09\/Bardintzeff.SAM_8274.Chuquet_Genestoux-450x337.jpg 450w, https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-content\/uploads\/sites\/3\/2016\/09\/Bardintzeff.SAM_8274.Chuquet_Genestoux-768x576.jpg 768w, https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-content\/uploads\/sites\/3\/2016\/09\/Bardintzeff.SAM_8274.Chuquet_Genestoux-1024x768.jpg 1024w, https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-content\/uploads\/sites\/3\/2016\/09\/Bardintzeff.SAM_8274.Chuquet_Genestoux.jpg 1134w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/p>\n<p>Les d\u00e9p\u00f4ts basaltiques rouge\u00e2tres du Chuquet_Genestoux englobent des enclaves de socle granitique claires (\u00a9 J.M. Bardintzeff, merci \u00e0 H\u00e9l\u00e8ne Courvoisier).<\/p>\n<p><!--more--><\/p>\n<p>Voici ce que j\u2019\u00e9cris sur les maars dans mon livre \u00ab\u00a0Volcanologie\u00a0\u00bb (5<sup>e<\/sup> \u00e9d., Dunod, 2016)\u00a0:<\/p>\n<p>Une d\u00e9pression \u00e0 fond plat reste dans le paysage, parfois occup\u00e9e par un lac (terme allemand de maar) car rapidement imperm\u00e9abilis\u00e9e par des argiles d\u2019alt\u00e9ration. Celle-ci diff\u00e8re d\u2019un crat\u00e8re classique, souvent en position sommitale et pouvant rester en communication avec la chemin\u00e9e d\u2019alimentation. La profondeur du point d\u2019explosion conditionne la taille du maar superficiel. Les diam\u00e8tres varient de moins de 100 m \u00e0 plus de 1\u00a0500\u00a0m et les profondeurs de quelques dizaines de m\u00e8tres \u00e0 200\u00a0m. Les \u00e9jectas expuls\u00e9s retombent en partie dans cette d\u00e9pression et en partie tout autour en un anneau, parfois r\u00e9duit \u00e0 un croissant selon la direction de l\u2019explosion, la topographie et les vents dominants.<\/p>\n<p>Merci \u00e0 Marc Mazataud.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Retour d\u2019une nouvelle visite volcanologique en Auvergne, avec les \u00e9tudiants de la pr\u00e9paration Capes Sciences de la vie et de la Terre (M1 MEEF) des Universit\u00e9s de Paris-Sud Orsay et de Cergy-Pontoise. Le maar d\u2019Enval se situe juste au pied du puy de D\u00f4me dans la cha\u00eene des Puys. Sur son bord est, au Chuquet &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2016\/09\/26\/maar-denval-chuquet-genestoux\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Maar d\u2019Enval et Chuquet Genestoux<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/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":[6,8],"tags":[62,538,539,540],"class_list":["post-1580","post","type-post","status-publish","format-standard","hentry","category-actualites","category-voyages","tag-chaine-des-puys","tag-chuquet-genestoux","tag-enval","tag-maar"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Maar d\u2019Enval et Chuquet Genestoux, 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\/2016\/09\/26\/maar-denval-chuquet-genestoux\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Maar d\u2019Enval et Chuquet Genestoux, par Jacques-Marie Bardintzeff\" \/>\n<meta property=\"og:description\" content=\"Retour d\u2019une nouvelle visite volcanologique en Auvergne, avec les \u00e9tudiants de la pr\u00e9paration Capes Sciences de la vie et de la Terre (M1 MEEF) des Universit\u00e9s de Paris-Sud Orsay et de Cergy-Pontoise. 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