{"id":378,"date":"2021-03-31T16:26:52","date_gmt":"2021-03-31T14:26:52","guid":{"rendered":"https:\/\/www.vulcania.com\/science\/?page_id=378"},"modified":"2023-03-22T10:08:23","modified_gmt":"2023-03-22T09:08:23","slug":"monts-dore-et-sancy","status":"publish","type":"page","link":"https:\/\/www.vulcania.com\/science\/auvergne\/volcans-dauvergne\/monts-dore-et-sancy\/","title":{"rendered":"Monts dore et Sancy"},"content":{"rendered":"

[vc_row el_class=\u00a0\u00bbbloc-titre\u00a0\u00bb][vc_column width=\u00a0\u00bb1\/12″][\/vc_column][vc_column width=\u00a0\u00bb10\/12″][vc_column_text]L\u2019imposant massif des Monts Dore<\/strong> (\u00e0 ne pas confondre avec la ville du Mont-Dore) est en fait le regroupement de plusieurs ensembles volcaniques, parmi lesquels le massif de l\u2019Aiguiller et le strato-volcan<\/a> du Sancy.<\/p>\n

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L\u2019activit\u00e9 volcanique<\/strong>, parfois interrompue par des phases de sommeil de plusieurs centaines de milliers d\u2019ann\u00e9es, y d\u00e9buta par de vastes \u00e9panchements de basalte<\/a>, il y a quelque 10 millions d\u2019ann\u00e9es (Ma).<\/p>\n

\u00c9v\u00e9nement majeur, une gigantesque\u00a0\u00e9ruption explosive<\/strong> se produisit il y a 3 Ma, r\u00e9pandant la \u00ab Grande Nappe de ponces \u00bb, dont le volume est estim\u00e9 de 9 km3. \u00c0 la suite de ce cataclysme, le vide cr\u00e9\u00e9 en profondeur provoqua l\u2019effondrement de la caldera<\/a> de Haute-Dordogne.<\/p>\n

Ce paroxysme fut suivi par la mise en place d\u2019une multitude d\u2019\u00e9difices p\u00e9riph\u00e9riques, dont plusieurs\u00a0d\u00f4mes de lave visqueuse<\/strong>, comme les\u00a0roches Tuili\u00e8re et Sanadoire\u00a0<\/strong>qui se dressent au Nord du massif.
\nL\u2019activit\u00e9 de cette zone s\u2019ach\u00e8ve avec l\u2019\u00e9dification du\u00a0strato-volcan<\/a> du Sancy<\/strong>, achev\u00e9e il y a seulement 250 000 ans, et actuel point culminant du Massif Central (1 886 m). Si les morphologies volcaniques, tr\u00e8s remani\u00e9es, sont difficilement reconnaissables, les reliefs restent vigoureux, du fait de la relative jeunesse de l\u2019ensemble.<\/p>\n

Cern\u00e9 de bois et de l\u00e9gendes, le lac Pavin<\/strong>\u00a0est install\u00e9 dans le crat\u00e8re d\u2019un\u00a0maar<\/strong><\/a>\u00a0de 1 km de diam\u00e8tre ; c\u2019est le plus jeune volcan de France m\u00e9tropolitaine, \u00e0 peine vieux de 6 700 ans. S\u2019il est g\u00e9ographiquement associ\u00e9 au massif des Monts Dore, les caract\u00e9ristiques et l\u2019\u00e2ge du Pavin le rattachent plut\u00f4t au\u00a0volcanisme<\/strong> de la Cha\u00eene de Puys.<\/p>\n

Dans la vall\u00e9e glaciaire de Chaudefour<\/strong>\u00a0entaillant les flancs du Sancy, l\u2019impressionnante Dent de la Rancune, pris\u00e9e des alpinistes, est un\u00a0dyke<\/strong>, c\u2019est-\u00e0-dire une \u00e9paisse lame de lave fig\u00e9e dans une ancienne fissure d\u2019alimentation, mise \u00e0 nu par l\u2019\u00e9rosion mill\u00e9naire.<\/p>\n<\/div>\n

[\/vc_column_text][\/vc_column][vc_column width=\u00a0\u00bb1\/12″][\/vc_column][\/vc_row][vc_row][vc_column width=\u00a0\u00bb1\/12″][\/vc_column][vc_column width=\u00a0\u00bb10\/12″][vc_column_text]<\/p>\n

Les autres ensembles g\u00e9ologiques de l’Auvergne volcanique :<\/h3>\n

[\/vc_column_text][vc_basic_grid post_type=\u00a0\u00bbpage\u00a0\u00bb max_items=\u00a0\u00bb10″ element_width=\u00a0\u00bb3″ item=\u00a0\u00bb573″ grid_id=\u00a0\u00bbvc_gid:1679476050869-a43e170a-a316-0″ taxonomies=\u00a0\u00bb18″][\/vc_column][vc_column width=\u00a0\u00bb1\/12″][\/vc_column][\/vc_row][vc_row][vc_column]

<\/span><\/span>

Exp\u00e9rimentez \u00e0 Vulcania<\/h4><\/span><\/span>\n<\/div>
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R\u00e9veil des G\u00e9ants d'Auvergne<\/h3>\n

Depuis environ 7000 ans, le volcanisme d'Auvergne semble en sommeil... Et si les volcans de la Cha\u00eene des Puys se r\u00e9veillaient ? Vivez en direct leur r\u00e9veil dans cette attraction dynamique !<\/p>\n\n\t\t<\/div>\n\t<\/div>\n

En savoir plus sur \"R\u00e9veil des g\u00e9ants d'Auvergne\"<\/a><\/div><\/div><\/div><\/div>
<\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div>[\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"Exp\u00e9rimentez \u00e0 Vulcania R\u00e9veil des G\u00e9ants d'Auvergne Depuis environ 7000 ans, le volcanisme d'Auvergne semble en sommeil... Et si les volcans de la Cha\u00eene des Puys se r\u00e9veillaient ? Vivez en direct leur r\u00e9veil dans cette attraction dynamique ! En savoir plus sur \"R\u00e9veil des g\u00e9ants d'Auvergne\"","protected":false},"author":4,"featured_media":764,"parent":227,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"tags":[18],"acf":[],"yoast_head":"\nMassif des Monts Dore et strato-volcan du Sancy<\/title>\n<meta name=\"description\" content=\"D\u00e9couvrez comment s'est form\u00e9 le regroupement d'ensembles volcaniques du massif du Monts Dore et apprenez-en plus sur le Sancy, ce strato-volcan culminant \u00e0 1886m.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.vulcania.com\/science\/auvergne\/volcans-dauvergne\/monts-dore-et-sancy\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Massif des Monts Dore et strato-volcan du Sancy\" \/>\n<meta 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