{"id":265,"date":"2023-05-17T08:46:04","date_gmt":"2023-05-17T06:46:04","guid":{"rendered":"https:\/\/nationalpark.08eins-preview.ch\/fr\/flore-et-faune\/geologie\/gneiss\/"},"modified":"2024-01-02T14:47:58","modified_gmt":"2024-01-02T13:47:58","slug":"gneiss","status":"publish","type":"florafauna_cpt","link":"https:\/\/nationalpark.ch\/fr\/flore-et-faune\/gneiss\/","title":{"rendered":"Gneiss"},"content":{"rendered":"<p><strong>Si l\u2019on soumet le granit \u00e0 une grande pression et \u00e0 de hautes temp\u00e9ratures, il se transforme en gneiss.<\/strong><\/p>\n<p>Le gneiss est une roche m\u00e9tamorphique. Sa composition est identique \u00e0 celle du granit, mais il diff\u00e8re par sa structure. Alors que dans le granit, les divers min\u00e9raux comme le quartz, le feldspath et le mica sont plac\u00e9s de fa\u00e7on d\u00e9sordonn\u00e9e, ils sont align\u00e9s parall\u00e8lement chez le gneiss. Cet alignement s&rsquo;est op\u00e9r\u00e9 durant la formation des montagnes. Sous l\u2019effet d&rsquo;\u00e9normes pressions, les min\u00e9raux s\u2019orientent et s\u2019alignent parall\u00e8lement. Ainsi r\u00e9sulte une schistosit\u00e9 en feuillets parall\u00e8les. Sur ses c\u00f4t\u00e9s, le gneiss se brise en plaques.<\/p>\n<p>Cette schistosit\u00e9 est bien visible dans le gneiss du Macun. Les stries parall\u00e8les se d\u00e9veloppent verticalement par rapport \u00e0 la pression subie jadis. Les gneiss sont les roches les plus anciennes de la r\u00e9gion.<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":0,"menu_order":0,"template":"","class_list":["post-265","florafauna_cpt","type-florafauna_cpt","status-publish","hentry","florafauna_category-geologie","florafauna_category-roches-cristallines"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Gneiss - Parc National Suisse<\/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:\/\/nationalpark.ch\/fr\/flore-et-faune\/gneiss\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Gneiss - Parc National Suisse\" \/>\n<meta property=\"og:description\" content=\"Si l\u2019on soumet le granit \u00e0 une grande pression et \u00e0 de hautes temp\u00e9ratures, il se transforme en gneiss. Le gneiss est une roche m\u00e9tamorphique. 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Le gneiss est une roche m\u00e9tamorphique. 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