{"id":271,"date":"2023-05-16T08:46:13","date_gmt":"2023-05-16T06:46:13","guid":{"rendered":"https:\/\/nationalpark.08eins-preview.ch\/fr\/flore-et-faune\/geologie\/radiolarite\/"},"modified":"2024-01-02T14:48:04","modified_gmt":"2024-01-02T13:48:04","slug":"radiolarite","status":"publish","type":"florafauna_cpt","link":"https:\/\/nationalpark.ch\/fr\/flore-et-faune\/radiolarite\/","title":{"rendered":"Radiolarite"},"content":{"rendered":"<p><strong>La radiolarite est une roche particuli\u00e8re. Elle a \u00e9t\u00e9 form\u00e9e au fond des mers \u00e0 une profondeur de 5&rsquo;000 m environ et s\u2019est constitu\u00e9e \u00e0 partir de squelettes de radiolaires.<\/strong><\/p>\n<p>Les radiolaires sont des animaux microscopiques vivant encore aujourd\u2019hui dans les mers froides. Leur squelette n\u2019est pas compos\u00e9, comme chez la plupart des animaux, de calcaire, mais d\u2019acide silicique ou d\u2019opale, similaire au verre du point de vue chimique.<br \/>\nLorsque les radiolaires meurent, leur squelette de verre coule lentement vers le fond. Ils y forment une vase de radiolaires. Au cours du temps, cette couche est comprim\u00e9e en une roche, la radiolarite.<br \/>\nEn dessous de 4&rsquo;500 m de profondeur, les coquilles calcaires, sensibles \u00e0 l\u2019acide, se dissolvent. Il ne reste que des squelettes de verre. La radiolarite nous renseigne ainsi \u00e9galement sur la profondeur des mers d\u2019antan.<br \/>\nLa radiolarite est dure. C\u2019est pourquoi on l\u2019a tr\u00e8s souvent utilis\u00e9e \u00e0 l\u2019\u00c2ge de pierre pour confectionner des outils.<br \/>\nUn site est r\u00e9put\u00e9 pour ses radiolarites sous le Piz d\u2019Esan, bien au-dessus du Val Trupchun dans le Parc National. Une vall\u00e9e lat\u00e9rale a m\u00eame \u00e9t\u00e9 nomm\u00e9e d\u2019apr\u00e8s elle. Val Cotschna signifie vall\u00e9e rouge.<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":0,"menu_order":0,"template":"","class_list":["post-271","florafauna_cpt","type-florafauna_cpt","status-publish","hentry","florafauna_category-geologie","florafauna_category-roches-sedimentaires"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Radiolarite - 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\/radiolarite\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Radiolarite - Parc National Suisse\" \/>\n<meta property=\"og:description\" content=\"La radiolarite est une roche particuli\u00e8re. 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Elle a \u00e9t\u00e9 form\u00e9e au fond des mers \u00e0 une profondeur de 5&rsquo;000 m environ et s\u2019est constitu\u00e9e \u00e0 partir de squelettes de radiolaires. 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