{"id":69666,"date":"2025-07-07T12:00:00","date_gmt":"2025-07-07T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/les-plus-vieilles-roches-terrestres-viennent-du-quebec"},"modified":"2025-07-08T00:29:09","modified_gmt":"2025-07-08T00:29:09","slug":"les-plus-vieilles-roches-terrestres-viennent-du-quebec","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/les-plus-vieilles-roches-terrestres-viennent-du-quebec","title":{"rendered":"Les Plus Vieilles Roches Terrestres Viennent du Qu\u00e9bec"},"content":{"rendered":"

Africa-Press – Senegal. <\/strong><\/span>Enfouies dans les paysages glace\u0301s du Nunavik, au nord du Que\u0301bec, les roches de la ceinture de Nuvvuagittuq sont les plus anciennes jamais identifie\u0301es sur Terre. A\u0302ge\u0301es de plus de 4,16 milliards d\u2019anne\u0301es, elles ont e\u0301te\u0301 date\u0301es par une e\u0301quipe franco-canadienne qui a combine\u0301 analyses ge\u0301ochimiques, observations pe\u0301trologiques et deux me\u0301thodes inde\u0301pendantes de datation isotopique. Leur e\u0301tude, publie\u0301e dans la revue Science, conforte une hypothe\u0300se de\u0301battue depuis plus de quinze ans: ces roches sont les derniers te\u0301moins de l\u2019Hade\u0301en, la division la plus ancienne des temps ge\u0301ologiques.<\/p>\n

Un tre\u0301sor enfoui sous les basaltes<\/b><\/p>\n

L\u2019histoire commence en 2017, lorsque Christian Sole, alors e\u0301tudiant a\u0300 l\u2019Universite\u0301 d\u2019Ottawa, pre\u0301le\u0300ve plusieurs e\u0301chantillons dans une zone isole\u0301e. Encadre\u0301 par Jonathan O\u2019Neil, professeur en ge\u0301ologie, le jeune chercheur s\u2019inte\u0301resse aux roches volcaniques d\u2019aspect mafique (riches en fer et magne\u0301sium) de la ceinture de Nuvvuagittuq. Ces roches avaient de\u0301ja\u0300 fait parler d\u2019elles de\u0300s 2008, quand Jonathan O\u2019Neil et ses colle\u0300gues avaient propose\u0301 un a\u0302ge de 4,28 milliards d\u2019anne\u0301es, sans que cette estimation fasse l\u2019unanimite\u0301.<\/p>\n

<\/p>\n

Cette fois, ce n\u2019est pas la roche volcanique elle-me\u0302me qui est date\u0301e, mais une intrusion magmatique venue la traverser plus tard. Or, celle-ci s\u2019est re\u0301ve\u0301le\u0301e vieille de 4,16 milliards d\u2019anne\u0301es. Ce qui implique que la roche encaissante est plus ancienne encore. Pour e\u0301tablir cette datation, l\u2019e\u0301quipe a mobilise\u0301 deux techniques de chronome\u0301trie isotopique base\u0301es sur le couple samarium-ne\u0301odyme (Sm-Nd), un syste\u0300me souvent utilise\u0301 pour dater les roches anciennes. Les re\u0301sultats obtenus dans deux laboratoires diffe\u0301rents ont converge\u0301 sur le me\u0302me a\u0302ge. Un signal robuste, et qui fait, cette fois, consensus.<\/p>\n

Une relique de la Terre primitive<\/b><\/p>\n

A\u0300 ce jour, aucune autre formation ge\u0301ologique sur Terre n\u2019a livre\u0301 d\u2019a\u0302ge aussi ancien. Les zircons de Jack Hills, en Australie, sont plus vieux (4,4 milliards d\u2019anne\u0301es), mais ce sont des mine\u0301raux isole\u0301s retrouve\u0301s dans des roches plus jeunes. A\u0300 Nuvvuagittuq, c\u2019est toute une structure lithique qui date de cette e\u0301poque. \u00ab Cette confirmation positionne la ceinture de Nuvvuagittuq comme le seul endroit sur Terre ou\u0300 l\u2019on retrouve des roches forme\u0301es pendant l\u2019Hade\u0301en \u00bb, pre\u0301cise dans un communique\u0301 Jonathan O\u2019Neil.<\/p>\n

<\/p>\n

Cela change la donne pour l\u2019e\u0301tude des premiers a\u0302ges de notre plane\u0300te. L\u2019Hade\u0301en reste une pe\u0301riode mal connue, sans plaques tectoniques identifie\u0301es, ou\u0300 les premiers noyaux continentaux se seraient lentement consolide\u0301s. E\u0301tudier les roches de Nuvvuagittuq, et \u00ab comprendre ces roches, c\u2019est remonter aux tout de\u0301buts de notre plane\u0300te \u00bb, re\u0301sume le ge\u0301ologue. \u00ab Cela nous aide a\u0300 mieux saisir comment les premiers continents se sont forme\u0301s et a\u0300 reconstituer l\u2019environnement ou\u0300 la vie aurait pu e\u0301merger \u00bb.<\/p>\n

Pour plus d’informations et d’analyses sur la Senegal<\/span>, suivez Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – Senegal. Enfouies dans les paysages glace\u0301s du Nunavik, au nord du Que\u0301bec, les roches de la ceinture de Nuvvuagittuq sont les plus anciennes jamais identifie\u0301es sur Terre. A\u0302ge\u0301es de plus de 4,16 milliards d\u2019anne\u0301es, elles ont e\u0301te\u0301 date\u0301es par une e\u0301quipe franco-canadienne qui a combine\u0301 analyses ge\u0301ochimiques, observations pe\u0301trologiques et deux me\u0301thodes inde\u0301pendantes […]<\/p>\n","protected":false},"author":82,"featured_media":69665,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-69666","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-2"],"yoast_head":"\nLes Plus Vieilles Roches Terrestres Viennent du Qu\u00e9bec - Senegal<\/title>\n<meta name=\"description\" content=\"Enfouies dans les paysages glace\u0301s du Nunavik, au nord du Que\u0301bec, les roches de la ceinture de Nuvvuagittuq sont les pl ...\" \/>\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.africa-press.net\/senegal\/toutes-les-actualites\/les-plus-vieilles-roches-terrestres-viennent-du-quebec\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les Plus Vieilles Roches Terrestres Viennent du Qu\u00e9bec\" \/>\n<meta property=\"og:description\" content=\"Enfouies dans les paysages glace\u0301s du Nunavik, au nord du Que\u0301bec, les roches de la ceinture de Nuvvuagittuq sont les pl ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/les-plus-vieilles-roches-terrestres-viennent-du-quebec\" \/>\n<meta property=\"og:site_name\" content=\"Senegal\" \/>\n<meta property=\"article:published_time\" content=\"2025-07-07T12:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-07-08T00:29:09+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/07\/sm_1751921732.953595.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/les-plus-vieilles-roches-terrestres-viennent-du-quebec#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/les-plus-vieilles-roches-terrestres-viennent-du-quebec\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Les Plus Vieilles Roches Terrestres Viennent du Qu\u00e9bec\",\"datePublished\":\"2025-07-07T12:00:00+00:00\",\"dateModified\":\"2025-07-08T00:29:09+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/les-plus-vieilles-roches-terrestres-viennent-du-quebec\"},\"wordCount\":534,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/les-plus-vieilles-roches-terrestres-viennent-du-quebec#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/07\/sm_1751921732.953595.jpg\",\"keywords\":[\"Senegal\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/les-plus-vieilles-roches-terrestres-viennent-du-quebec#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/les-plus-vieilles-roches-terrestres-viennent-du-quebec\",\"url\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/les-plus-vieilles-roches-terrestres-viennent-du-quebec\",\"name\":\"Les Plus Vieilles Roches Terrestres Viennent du Qu\u00e9bec - 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