{"id":2254,"date":"2017-04-05T15:24:29","date_gmt":"2017-04-05T15:24:29","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/?p=2254"},"modified":"2017-04-05T16:50:15","modified_gmt":"2017-04-05T16:50:15","slug":"la-chaussee-des-geants","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2017\/04\/05\/la-chaussee-des-geants\/","title":{"rendered":"La Chauss\u00e9e des G\u00e9ants"},"content":{"rendered":"

Karine Rigal m\u2019invite \u00e0 publier une photo de la nature \u00ab\u00a0explor\u00e9e \u00e0 travers la science\u00a0\u00bb comme elle le dit si joliment!<\/p>\n

Voici la fameuse Chauss\u00e9e des G\u00e9ants (\u00ab\u00a0Giant\u2019s Causeway\u00a0\u00bb), dans le comt\u00e9 d\u2019Antrim en Irlande du Nord. Il s\u2019agit d\u2019une coul\u00e9e de lave qui s\u2019est d\u00e9bit\u00e9e en prismes hexagonaux lors de son refroidissement, mimant un pavage gigantesque.<\/p>\n

\"\"Orgues volcaniques (ou basaltiques) \u00e0 la Chauss\u00e9e des G\u00e9ants (\u00a9 J.M. Bardintzeff).<\/p>\n

<\/p>\n

Voici ce que j\u2019\u00e9cris dans mon livre \u00ab\u00a0Volcanologie\u00a0\u00bb, J.M. Bardintzeff, \u00c9d. Dunod, 5e<\/sup> \u00e9dition, 2016\u00a0:<\/p>\n

Une coul\u00e9e de lave peut mettre plusieurs ann\u00e9es pour se refroidir compl\u00e8tement. Apr\u00e8s sa mise en place, le corps de la coul\u00e9e, en se refroidissant, se solidifie et parfois forme des prismes hexagonaux en colonnes verticales, semblables \u00e0 des orgues et donc appel\u00e9s orgues basaltiques, bien visibles dans les coul\u00e9es anciennes, \u00e9rod\u00e9es. La surface de la coul\u00e9e r\u00e9v\u00e8le apr\u00e8s \u00e9rosion une sorte de pavage constitu\u00e9 d\u2019\u00e9l\u00e9ments de plusieurs dizaines de centim\u00e8tres. De telles figures proviennent d\u2019une diminution de volume de la lave qui, en se r\u00e9tractant, se fissure selon des formes g\u00e9om\u00e9triques.<\/p>\n","protected":false},"excerpt":{"rendered":"

Karine Rigal m\u2019invite \u00e0 publier une photo de la nature \u00ab\u00a0explor\u00e9e \u00e0 travers la science\u00a0\u00bb comme elle le dit si joliment! Voici la fameuse Chauss\u00e9e des G\u00e9ants (\u00ab\u00a0Giant\u2019s Causeway\u00a0\u00bb), dans le comt\u00e9 d\u2019Antrim en Irlande du Nord. Il s\u2019agit d\u2019une coul\u00e9e de lave qui s\u2019est d\u00e9bit\u00e9e en prismes hexagonaux lors de son refroidissement, mimant un … Continuer la lecture de La Chauss\u00e9e des G\u00e9ants<\/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":[8],"tags":[808,21,809,380,810,811,812,136,329],"class_list":["post-2254","post","type-post","status-publish","format-standard","hentry","category-voyages","tag-antrim","tag-bardintzeff","tag-chaussee-des-geants","tag-dunod","tag-giants-causeway","tag-irlande","tag-orgue-basaltique","tag-orgue-volcanique","tag-volcanologie"],"yoast_head":"\nLa Chauss\u00e9e des G\u00e9ants, 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\/04\/05\/la-chaussee-des-geants\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La Chauss\u00e9e des G\u00e9ants, par Jacques-Marie Bardintzeff\" \/>\n<meta property=\"og:description\" content=\"Karine Rigal m\u2019invite \u00e0 publier une photo de la nature \u00ab\u00a0explor\u00e9e \u00e0 travers la science\u00a0\u00bb comme elle le dit si joliment! 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