{"id":162,"date":"2014-02-14T20:22:43","date_gmt":"2014-02-14T20:22:43","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/?p=162"},"modified":"2020-10-20T13:38:24","modified_gmt":"2020-10-20T13:38:24","slug":"voyage-yellowstone","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2014\/02\/14\/voyage-yellowstone\/","title":{"rendered":"Voyage \u00e0 Yellowstone"},"content":{"rendered":"

De temps en temps (une ou deux fois par an), j\u2019accompagne, \u00e0 titre de conseiller scientifique et p\u00e9dagogique, un groupe de passionn\u00e9s vers une r\u00e9gion volcanique. La derni\u00e8re fois, c\u2019\u00e9tait en octobre 2013 \u00e0 l\u2019\u00eele de P\u00e2ques. La prochaine fois ce sera dans l\u2019Ouest am\u00e9ricain.<\/p>\n

Avec \u00ab\u00a080 jours voyages \u00bb, nous programmons un voyage exceptionnel \u00e0 Yellowstone dans le Wyoming, du 15 au 25 juillet 2014. Yellowstone est un \u00ab\u00a0supervolcan\u00a0\u00bb qui a fait dans le pass\u00e9 au moins 3 \u00ab\u00a0super-\u00e9ruptions\u00a0\u00bb c’est-\u00e0-dire une \u00e9ruption 1000 fois plus forte qu\u2019une \u00e9ruption \u00ab\u00a0normale\u00a0\u00bb\u2026 pourtant d\u00e9j\u00e0 fort impressionnante. Ces \u00e9ruptions remontent \u00e0 2,1 millions d\u2019ann\u00e9es, 1,3 millions d\u2019ann\u00e9es et 630 000 ans, et ont produit, respectivement, 2 500 km3<\/sup>, 280 km3<\/sup> et 1 000 km3<\/sup> de ponces et de cendres (la formidable \u00e9ruption du Pinatubo aux Philippines en 1991 n\u2019a produit \u00ab\u00a0que\u00a0\u00bb 10 km3<\/sup> !)<\/p>\n

La vidange de la chambre magmatique profonde a provoqu\u00e9 un effondrement de l\u2019ensemble qui forme maintenant une caldeira, un gigantesque crat\u00e8re \u00e0 fond plat, de plus de 70 x 50 km pour quelques centaines de m\u00e8tres de profondeur.<\/p>\n

Dans cette caldeira, gargouillent 300 geysers et 10\u00a0000 sources chaudes, que nous d\u00e9couvrirons.<\/p>\n

Le geyser le plus c\u00e9l\u00e8bre car le plus r\u00e9gulier est le \u00ab\u00a0Old Faithful\u00a0\u00bb, le \u00ab\u00a0Vieux Fid\u00e8le\u00a0\u00bb, qui jaillit r\u00e9guli\u00e8rement toutes les heures ou heures et demi. Les autres geysers, plus cabotins, jaillissent toutes les minutes (Minute geyser) ou, plus paresseux, s’arr\u00eatent plusieurs heures.<\/p>\n

\"Bardintzeff.USA<\/a><\/p>\n

Le geyser \u00ab\u00a0Old Faithful\u00a0\u00bb, le \u00ab\u00a0Vieux Fid\u00e8le\u00a0\u00bb (\u00a9 J.M. Bardintzeff).<\/p>\n

<\/p>\n

\"Bardintzeff.USA<\/a><\/p>\n

\u00ab\u00a0Castle Geyser\u00a0\u00bb (\u00a9 J.M. Bardintzeff).<\/p>\n

\"Bardintzeff.USA<\/a><\/p>\n

\u00ab Grotto Geyser \u00bb (\u00a9 J.M. Bardintzeff).<\/p>\n

Les sources thermales prennent des couleurs extraordinaires, gr\u00e2ce aux sels min\u00e9raux dissous et aux algues et bact\u00e9ries qui vivent dans les eaux chaudes. Leurs noms sont \u00e9vocateurs\u00a0: Beryl Spring, Emerald Pool, Sapphire Pool, Opalescent Pool, Porcelain Basin. \u00ab\u00a0Morning Glory Pool\u00a0\u00bb d\u00e9cline toute une palette de couleur, du vert au rouge. Fountain Paint Pot sont des mares boueuses qui clapotent doucement en lib\u00e9rant leurs gaz. Par endroit, on croirait voir la palette d’un artiste g\u00e9ant.<\/p>\n

Au nord, \u00ab\u00a0Mammoth hot springs\u00a0\u00bb sont les plus grandes sources thermo-min\u00e9rales p\u00e9trifiantes du monde. Elles ont d\u00e9pos\u00e9 du calcaire blanc en gigantesques terrasses successives (Jupiter Terrasse et Minerva Terrasse).<\/p>\n

Ailleurs, quantit\u00e9s d’autres surprises g\u00e9ologiques attendent le visiteur\u00a0: une falaise d’obsidienne, pierre volcanique noire et vitreuse, un tronc d’arbre p\u00e9trifi\u00e9… Les animaux sont rois, surtout l’hiver dans la neige\u00a0: bisons, \u00e9lans, loups, coyotes…<\/p>\n

\"Bardintzeff.USA<\/a><\/p>\n

\u00ab Morning Glory Pool \u00bb, \u00ab l\u2019\u00c9tang du matin glorieux \u00bb !<\/p>\n

Nous irons ensuite \u00e0 \u00ab Devils Tower \u00bb (la \u00ab Tour du diable \u00bb), toujours dans le Wyoming. Il s\u2019agit d\u2019une colonne prism\u00e9e, haute de 386 m, en roche volcanique (de la phonolite). C\u2019est ici qu\u2019a \u00e9t\u00e9 tourn\u00e9 le film de Steven Spielberg \u00ab Rencontres du troisi\u00e8me type \u00bb o\u00f9 les hommes ont rendez-vous avec les extraterrestres !<\/p>\n

Et pour ceux qui ne seraient pas rassasi\u00e9s, il y a une possibilit\u00e9 de prolonger jusqu\u2019au volcan mont Saint Helens dans l\u2019\u00c9tat de Washington.<\/p>\n

\"Bardintzeff.CAN-US<\/a><\/p>\n

Le mont Saint Helens en 1987, 7 ans apr\u00e8s son \u00e9ruption cataclysmale. Le volcan a \u00e9t\u00e9 d\u00e9capit\u00e9 et a perdu 300 m de haut. Des troncs d\u2019arbres, arrach\u00e9s par les nu\u00e9es ardentes, flottent sur \u00ab\u00a0Spirit Lake\u00a0\u00bb (\u00a9 J.M. Bardintzeff).<\/p>\n

Renseignements :<\/p>\n

Sylvain Chermette, 09 81 07 43 66, contact@80joursvoyages.com<\/a>, www.80joursvoyages.com<\/a><\/p>\n

http:\/\/80joursvoyages.com\/holiday\/usa-yellowstone-devils-tower-avec-j-m-bardintzeff-10-jours\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

De temps en temps (une ou deux fois par an), j\u2019accompagne, \u00e0 titre de conseiller scientifique et p\u00e9dagogique, un groupe de passionn\u00e9s vers une r\u00e9gion volcanique. La derni\u00e8re fois, c\u2019\u00e9tait en octobre 2013 \u00e0 l\u2019\u00eele de P\u00e2ques. La prochaine fois ce sera dans l\u2019Ouest am\u00e9ricain. Avec \u00ab\u00a080 jours voyages \u00bb, nous programmons un voyage exceptionnel … Continuer la lecture de Voyage \u00e0 Yellowstone<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":3,"featured_media":169,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[6,8],"tags":[37,39,97,38,36],"class_list":["post-162","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","category-voyages","tag-devils-tower","tag-geyser","tag-mont-saint-helens","tag-wyoming","tag-yellowstone"],"yoast_head":"\nVoyage \u00e0 Yellowstone, 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\/2014\/02\/14\/voyage-yellowstone\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Voyage \u00e0 Yellowstone, par Jacques-Marie Bardintzeff\" \/>\n<meta property=\"og:description\" content=\"De temps en temps (une ou deux fois par an), j\u2019accompagne, \u00e0 titre de conseiller scientifique et p\u00e9dagogique, un groupe de passionn\u00e9s vers une r\u00e9gion volcanique. La derni\u00e8re fois, c\u2019\u00e9tait en octobre 2013 \u00e0 l\u2019\u00eele de P\u00e2ques. La prochaine fois ce sera dans l\u2019Ouest am\u00e9ricain. 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