{"id":5830,"date":"2020-06-07T18:14:09","date_gmt":"2020-06-07T18:14:09","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/?p=5830"},"modified":"2020-06-11T07:42:16","modified_gmt":"2020-06-11T07:42:16","slug":"moeraki-boulders-nouvelle-zelande","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2020\/06\/07\/moeraki-boulders-nouvelle-zelande\/","title":{"rendered":"Moeraki Boulders, Nouvelle-Z\u00e9lande"},"content":{"rendered":"

Sur une plage de la c\u00f4te est de l\u2019\u00eele du Sud de la Nouvelle Z\u00e9lande, entre Hampden et Moeraki, des dizaines de boules de roches : les fameux \u00ab Moeraki Boulders \u00bb.<\/p>\n

Des s\u00e9diments calcaires se sont accumul\u00e9s il y a 60 millions d\u2019ann\u00e9es. La calcite a cristallis\u00e9 autour de germes (un gravier, un fragment de coquille, par exemple) au sein du s\u00e9diment, lentement et r\u00e9guli\u00e8rement, jusqu\u2019\u00e0 former, par concr\u00e9tion, des boules de forme g\u00e9om\u00e9trique parfaite. Certaines boules se sont ensuite fissur\u00e9es et les fissures ont \u00e9t\u00e9 combl\u00e9es, formant une \u00ab septaria \u00bb. Enfin, les boules, d\u00e9gag\u00e9es par l\u2019\u00e9rosion, ont roul\u00e9 jusqu\u2019en bord de mer. La mer a us\u00e9 certaines boules et en a r\u00e9v\u00e9l\u00e9 la structure interne.<\/p>\n

\"\"<\/p>\n

Les \u00ab\u00a0Moeraki Boulders\u00a0\u00bb, au bord de la mer, en Nouvelle-Z\u00e9lande (\u00a9 J.M. Bardintzeff).<\/p>\n

<\/p>\n

\"\"Jacques-Marie Bardintzeff, g\u00e9ologue et volcanologue, dubitatif devant les \u00ab\u00a0Moeraki Boulders\u00a0\u00bb, en Nouvelle-Z\u00e9lande (\u00a9 J.M. Bardintzeff).<\/p>\n

Il faudrait 120 000 ans pour former une boule de 0,5 m de diam\u00e8tre et 4 millions d\u2019ann\u00e9es pour une boule de 2 m de diam\u00e8tre\u00a0!<\/p>\n

\"\"<\/p>\n

Au premier plan, un \u00ab\u00a0Moeraki Boulder\u00a0\u00bb dont l\u2019usure r\u00e9v\u00e8le sa structure en \u00ab\u00a0septaria\u00a0\u00bb, Nouvelle-Z\u00e9lande (\u00a9 J.M. Bardintzeff).<\/p>\n

Voir aussi des boules de pierres au Turkm\u00e9nistan (mon blog du 7\/7\/2018), au Kazakhstan (mon blog des 16\/11\/2019 et 24\/12\/2019) et en Roumanie (mon blog du 25\/5\/2020).<\/p>\n","protected":false},"excerpt":{"rendered":"

Sur une plage de la c\u00f4te est de l\u2019\u00eele du Sud de la Nouvelle Z\u00e9lande, entre Hampden et Moeraki, des dizaines de boules de roches : les fameux \u00ab Moeraki Boulders \u00bb. Des s\u00e9diments calcaires se sont accumul\u00e9s il y a 60 millions d\u2019ann\u00e9es. La calcite a cristallis\u00e9 autour de germes (un gravier, un fragment … Continuer la lecture de Moeraki Boulders, Nouvelle-Z\u00e9lande<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[8],"tags":[21,2039,2040,1809,2041],"class_list":["post-5830","post","type-post","status-publish","format-standard","hentry","category-voyages","tag-bardintzeff","tag-moeraki","tag-moeraki-boulders","tag-nouvelle-zelande","tag-septaria"],"yoast_head":"\nMoeraki Boulders, Nouvelle-Z\u00e9lande, 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\/2020\/06\/07\/moeraki-boulders-nouvelle-zelande\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Moeraki Boulders, Nouvelle-Z\u00e9lande, par Jacques-Marie Bardintzeff\" \/>\n<meta property=\"og:description\" content=\"Sur une plage de la c\u00f4te est de l\u2019\u00eele du Sud de la Nouvelle Z\u00e9lande, entre Hampden et Moeraki, des dizaines de boules de roches : les fameux \u00ab Moeraki Boulders \u00bb. 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