{"id":15822,"date":"2022-06-10T12:15:15","date_gmt":"2022-06-10T12:15:15","guid":{"rendered":"https:\/\/gifex.com\/fr\/?post_type=ficha&#038;p=15822"},"modified":"2023-03-25T14:19:23","modified_gmt":"2023-03-25T14:19:23","slug":"carte-geologique-du-massif-armoricain","status":"publish","type":"ficha","link":"https:\/\/gifex.com\/fr\/fichier\/carte-geologique-du-massif-armoricain\/","title":{"rendered":"Carte g\u00e9ologique du Massif armoricain"},"content":{"rendered":"<p style=\"text-align: center;\"><label style=\"font-size: 15px;\">Carte g\u00e9ologique simplifi\u00e9e du Massif armoricain.<\/label><\/p>\n<p>Le Massif armoricain s&#8217;\u00e9tend sur 65 000 km\u00b2, soit approximativement le neuvi\u00e8me de la surface de la France m\u00e9tropolitaine. Cette entit\u00e9 g\u00e9ologique englobe les \u00eeles Anglo-Normandes, la Bretagne, l&#8217;ouest de la Normandie, une grande partie des Pays de la Loire et le nord-ouest de la r\u00e9gion Nouvelle-Aquitaine (d\u00e9partement des Deux-S\u00e8vres).<\/p>\n<p>Il est constitu\u00e9 de quatre domaines de plateaux et collines (plateaux ouest-armoricain et bas-normand, collines vend\u00e9ennes et du Cotentin) ceintur\u00e9 par des domaines aplanis de plus faible altitude (bas plateau breton, plates-formes du L\u00e9on, du Tr\u00e9gor, de Vannes et de Basse-Loire, etc.).<\/p>\n<p>Son point culminant est le mont des Avaloirs, en Mayenne \u00e0 la limite de l&#8217;Orne, avec une altitude de 416 m selon des \u00e9tudes r\u00e9centes de l&#8217;IGN. Autrefois, il \u00e9tait cr\u00e9dit\u00e9, comme le signal d&#8217;\u00c9couves, dans l&#8217;Orne, d&#8217;une altitude de 417 m. Ce dernier est d\u00e9sormais mesur\u00e9 \u00e0 413 m.<\/p>\n<p>Le massif a subi depuis le passage Plio-Pl\u00e9istoc\u00e8ne (2,6 Ma) un basculement vers le sud pendant sa surrection par rapport \u00e0 la d\u00e9pression de Rennes. Ce basculement a provoqu\u00e9 le soul\u00e8vement de sa marge nord et un effondrement relatif de sa marge sud dont le relief, \u00e9tag\u00e9 en gradins, descend progressivement vers l&#8217;Atlantique. Ce soul\u00e8vement diff\u00e9rentiel a eu pour cons\u00e9quence un vigoureux encaissement des vall\u00e9es au nord de la ligne de partage des eaux et leur comblement g\u00e9n\u00e9ralis\u00e9 au sud du cisaillement sud-armoricain.<\/p>\n<p>L&#8217;histoire g\u00e9ologique est \u00e9galement marqu\u00e9e par la surrection relative de la Bretagne occidentale de 30 m par rapport au bassin de Rennes depuis 700 000 ans. La limite entre l&#8217;ouest qui a tendance \u00e0 s&#8217;exhausser et l&#8217;est qui a tendance \u00e0 s&#8217;abaisser est une faille active qui va de la baie de Saint-Brieuc \u00e0 l&#8217;estuaire de la Vilaine10.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le Massif armoricain s&#8217;\u00e9tend sur 65 000 km\u00b2, soit approximativement le neuvi\u00e8me de la surface de la France m\u00e9tropolitaine. Cette entit\u00e9 g\u00e9o<\/p>\n","protected":false},"author":1,"featured_media":15823,"template":"","categoria_ficha":[1776],"class_list":["post-15822","ficha","type-ficha","status-publish","has-post-thumbnail","hentry","categoria_ficha-cartes-de-la-bretagne"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Carte g\u00e9ologique du Massif armoricain - Gifex<\/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:\/\/gifex.com\/fr\/fichier\/carte-geologique-du-massif-armoricain\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Carte g\u00e9ologique du Massif armoricain - Gifex\" \/>\n<meta property=\"og:description\" content=\"Le Massif armoricain s&#039;\u00e9tend sur 65 000 km\u00b2, soit approximativement le neuvi\u00e8me de la surface de la France m\u00e9tropolitaine. 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