{"id":809251,"date":"2019-12-16T14:20:20","date_gmt":"2019-12-16T13:20:20","guid":{"rendered":"https:\/\/www.tomsguide.fr\/?p=809251"},"modified":"2024-02-01T15:14:29","modified_gmt":"2024-02-01T14:14:29","slug":"la-disparition-des-dinosaures-aurait-commence-bien-avant-limpact-dune-meteorite","status":"publish","type":"post","link":"https:\/\/www.tomsguide.fr\/la-disparition-des-dinosaures-aurait-commence-bien-avant-limpact-dune-meteorite\/","title":{"rendered":"La disparition des dinosaures aurait commenc\u00e9 bien avant l\u2019impact d\u2019une m\u00e9t\u00e9orite"},"content":{"rendered":"\n<p>L\u2019<strong>extinction des dinosaures<\/strong> ainsi que des trois quarts des esp\u00e8ces vivantes il y a <strong>66 millions d\u2019ann\u00e9es<\/strong> est commun\u00e9ment attribu\u00e9e \u00e0 l\u2019<strong>impact d\u2019un ast\u00e9ro\u00efde<\/strong>. La communaut\u00e9 scientifique estime qu\u2019un objet d\u2019environ <strong>10 km<\/strong> serait tomb\u00e9 dans le golfe du Mexique pour former le <strong>crat\u00e8re de Chicxulub<\/strong>. L\u2019impact aurait projet\u00e9 des millions de tonnes de poussi\u00e8re dans l\u2019atmosph\u00e8re, et ainsi modifi\u00e9 radicalement le climat pendant plusieurs ann\u00e9es. L\u2019observation des couches g\u00e9ologiques confirme cette th\u00e9orie, pourtant d\u2019autres facteurs ont pu jouer un r\u00f4le, notamment l\u2019<strong>activit\u00e9 volcanique des Trapps du Deccan<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img alt=\"Image 1 : La disparition des dinosaures aurait commenc\u00e9 bien avant l\u2019impact d\u2019une m\u00e9t\u00e9orite\" decoding=\"async\" width=\"712\" height=\"480\" src=\"https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2019\/12\/fossile-mercure-extinction-dinosaure.jpg\" alt=\"\" class=\"wp-image-809252\" srcset=\"https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2019\/12\/fossile-mercure-extinction-dinosaure.jpg 712w, https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2019\/12\/fossile-mercure-extinction-dinosaure-300x202.jpg 300w, https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2019\/12\/fossile-mercure-extinction-dinosaure-150x101.jpg 150w, https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2019\/12\/fossile-mercure-extinction-dinosaure-200x135.jpg 200w, https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2019\/12\/fossile-mercure-extinction-dinosaure-250x169.jpg 250w, https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2019\/12\/fossile-mercure-extinction-dinosaure-350x236.jpg 350w, https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2019\/12\/fossile-mercure-extinction-dinosaure-400x270.jpg 400w, https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2019\/12\/fossile-mercure-extinction-dinosaure-450x303.jpg 450w, https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2019\/12\/fossile-mercure-extinction-dinosaure-500x337.jpg 500w, https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2019\/12\/fossile-mercure-extinction-dinosaure-550x371.jpg 550w, https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2019\/12\/fossile-mercure-extinction-dinosaure-600x404.jpg 600w, https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2019\/12\/fossile-mercure-extinction-dinosaure-640x431.jpg 640w, https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2019\/12\/fossile-mercure-extinction-dinosaure-710x479.jpg 710w\" sizes=\"(max-width: 712px) 100vw, 712px\" \/><\/figure>\n\n\n\n<p class=\"has-background has-very-light-gray-background-color\"><strong><a href=\"https:\/\/www.tomsguide.fr\/comment-notre-cerveau-nous-protege-notre-propre-mort\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Notre cerveau nous prot\u00e8ge de notre propre mort (s\u2019ouvre dans un nouvel onglet)\">Notre cerveau nous prot\u00e8ge de notre propre mort<\/a><\/strong><\/p>\n\n\n\n<p>Les scientifiques ont constat\u00e9 une forte activit\u00e9 volcanique dans la r\u00e9gion des <strong>Trapps du Deccan<\/strong>, \u00e0 l\u2019ouest de l\u2019Inde actuelle. Sa <strong>couche de basalte de 2400 m\u00e8tres d\u2019\u00e9paisseur<\/strong> t\u00e9moigne d\u2019\u00e9ruptions volcaniques r\u00e9p\u00e9t\u00e9es \u00e0 la fin du Cr\u00e9tac\u00e9, et sur une p\u00e9riode de <strong>500\u2009000 mille ans<\/strong>. Ils imaginent que ces \u00e9v\u00e8nements ont aussi eu un r\u00f4le significatif sur l\u2019environnement sans parvenir n\u00e9anmoins \u00e0 le quantifier pr\u00e9cis\u00e9ment. Les r\u00e9sultats d\u2019une nouvelle \u00e9tude men\u00e9e par l\u2019universit\u00e9 du Michigan montrent les cons\u00e9quences des \u00e9ruptions volcaniques des Trapps du Deccan, et donnent un nouveau regard sur cette p\u00e9riode.<\/p>\n\n\n\n<p class=\"has-background has-very-light-gray-background-color\"><strong><a href=\"https:\/\/www.tomsguide.fr\/les-etats-unis-sont-ils-rentres-en-contact-avec-aliens-edward-snowden-le-sait\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Les Etats-Unis sont-ils entr\u00e9s en contact avec des Aliens ? Edward Snowden le sait (s\u2019ouvre dans un nouvel onglet)\">Les Etats-Unis sont-ils entr\u00e9s en contact avec des Aliens ? Edward Snowden le sait<\/a><\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">L\u2019activit\u00e9 volcanique des Trapps du Deccan \u00e0 l\u2019origine d\u2019un profond changement climatique<\/h2>\n\n\n\n<p>Pour mesurer l\u2019impact des \u00e9ruptions volcaniques sur l\u2019environnement, les chercheurs ont proc\u00e9d\u00e9 \u00e0 des <strong>analyses chimiques sur des fossiles marins<\/strong> de cette p\u00e9riode, et provenant de partout dans le monde. Leur coquille a r\u00e9v\u00e9l\u00e9 un <strong>taux de mercure anormalement \u00e9lev\u00e9<\/strong>, ainsi qu\u2019un r\u00e9chauffement de la temp\u00e9rature des oc\u00e9ans. Kyle Meyer, l\u2019auteur principale de l\u2019\u00e9tude, explique l\u2019activit\u00e9 volcanique indienne est directement \u00e0 l\u2019origine du mercure. Il ajoute \u00e9galement que <strong>la temp\u00e9rature des oc\u00e9ans croit \u00e0 mesure que sa concentration augmente<\/strong>.\u00a0<\/p>\n\n\n\n<p>Les r\u00e9sultats de l\u2019\u00e9tude tendent donc \u00e0 prouver que le changement climatique qui a caus\u00e9 l\u2019extinction du Cr\u00e9tac\u00e9 aurait d\u00e9but\u00e9 avant l\u2019impact d\u2019un ast\u00e9ro\u00efde. L\u2019activit\u00e9 volcanique des Trapps du Deccan aurait peu \u00e0 peu modifi\u00e9 le climat sur une p\u00e9riode suffisamment courte pour que la plupart des organismes vivants ne puissent s\u2019adapter.\u00a0<\/p>\n\n\n\n<p class=\"has-background has-very-light-gray-background-color\"><strong>Le prochain Rover martien de la NASA cherchera des fossiles<\/strong><\/p>\n\n\n\n<p>Source : <a href=\"https:\/\/phys.org\/news\/2019-12-fossil-shells-reveal-global-mercury.html\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"phys.org (s\u2019ouvre dans un nouvel onglet)\">phys.org<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>L\u2019extinction de la plupart des dinosaures n\u2019est pas uniquement due \u00e0 l\u2019impact d\u2019un ast\u00e9ro\u00efde il y a 66 millions d\u2019ann\u00e9es. Une nouvelle \u00e9tude tend m\u00eame \u00e0 montrer qu\u2019il s\u2019agirait plut\u00f4t du coup de gr\u00e2ce. Le\u2026<\/p>","protected":false},"author":82,"featured_media":809252,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"ep_exclude_from_search":false,"footnotes":""},"categories":[494,3854],"tags":[],"hubs":[],"acf":{"display_mode":"medium-img","post_show_excerpt":true,"post_source":"","hide_sidebar":false,"hide_advertising":false},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v22.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>La disparition des dinosaures aurait commenc\u00e9 bien avant l\u2019impact d\u2019une m\u00e9t\u00e9orite<\/title>\n<meta name=\"description\" content=\"L\u2019extinction de la plupart des dinosaures n\u2019est pas uniquement due \u00e0 l\u2019impact d\u2019un ast\u00e9ro\u00efde il y a 66 millions d\u2019ann\u00e9es. Une nouvelle \u00e9tude tend m\u00eame \u00e0 montrer qu\u2019il s\u2019agirait plut\u00f4t du coup de gr\u00e2ce. Le changement climatique qui a caus\u00e9 leur disparition aurait en effet d\u00e9but\u00e9 bien avant \u00e0 cause d\u2019\u00e9ruptions volcaniques r\u00e9p\u00e9t\u00e9es dans les Trapps du Deccan.\" \/>\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.tomsguide.fr\/la-disparition-des-dinosaures-aurait-commence-bien-avant-limpact-dune-meteorite\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La disparition des dinosaures aurait commenc\u00e9 bien avant l\u2019impact d\u2019une m\u00e9t\u00e9orite\" \/>\n<meta property=\"og:description\" content=\"L\u2019extinction de la plupart des dinosaures n\u2019est pas uniquement due \u00e0 l\u2019impact d\u2019un ast\u00e9ro\u00efde il y a 66 millions d\u2019ann\u00e9es. Une nouvelle \u00e9tude tend m\u00eame \u00e0 montrer qu\u2019il s\u2019agirait plut\u00f4t du coup de gr\u00e2ce. Le changement climatique qui a caus\u00e9 leur disparition aurait en effet d\u00e9but\u00e9 bien avant \u00e0 cause d\u2019\u00e9ruptions volcaniques r\u00e9p\u00e9t\u00e9es dans les Trapps du Deccan.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.tomsguide.fr\/la-disparition-des-dinosaures-aurait-commence-bien-avant-limpact-dune-meteorite\/\" \/>\n<meta property=\"og:site_name\" content=\"Toms Guide\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/TomsGuideFrance\/\" \/>\n<meta property=\"article:published_time\" content=\"2019-12-16T13:20:20+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-02-01T14:14:29+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2019\/12\/fossile-mercure-extinction-dinosaure.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"712\" \/>\n\t<meta property=\"og:image:height\" content=\"480\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"David Corroy\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@malibard\" \/>\n<meta name=\"twitter:site\" content=\"@tomsguidefr\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.tomsguide.fr\/la-disparition-des-dinosaures-aurait-commence-bien-avant-limpact-dune-meteorite\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.tomsguide.fr\/la-disparition-des-dinosaures-aurait-commence-bien-avant-limpact-dune-meteorite\/\"},\"author\":{\"name\":\"David Corroy\",\"@id\":\"https:\/\/www.tomsguide.fr\/#\/schema\/person\/7e879b8ff19551713f6055fd98dccf18\"},\"headline\":\"La disparition des dinosaures aurait commenc\u00e9 bien avant l\u2019impact d\u2019une m\u00e9t\u00e9orite\",\"datePublished\":\"2019-12-16T13:20:20+00:00\",\"dateModified\":\"2024-02-01T14:14:29+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.tomsguide.fr\/la-disparition-des-dinosaures-aurait-commence-bien-avant-limpact-dune-meteorite\/\"},\"wordCount\":440,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.tomsguide.fr\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.tomsguide.fr\/la-disparition-des-dinosaures-aurait-commence-bien-avant-limpact-dune-meteorite\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2019\/12\/fossile-mercure-extinction-dinosaure.jpg\",\"articleSection\":[\"Actualit\u00e9\",\"Science\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.tomsguide.fr\/la-disparition-des-dinosaures-aurait-commence-bien-avant-limpact-dune-meteorite\/#respond\"]}],\"copyrightYear\":\"2019\",\"copyrightHolder\":{\"@id\":\"https:\/\/www.tomsguide.fr\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.tomsguide.fr\/la-disparition-des-dinosaures-aurait-commence-bien-avant-limpact-dune-meteorite\/\",\"url\":\"https:\/\/www.tomsguide.fr\/la-disparition-des-dinosaures-aurait-commence-bien-avant-limpact-dune-meteorite\/\",\"name\":\"La disparition des dinosaures aurait commenc\u00e9 bien avant l\u2019impact d\u2019une m\u00e9t\u00e9orite\",\"isPartOf\":{\"@id\":\"https:\/\/www.tomsguide.fr\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.tomsguide.fr\/la-disparition-des-dinosaures-aurait-commence-bien-avant-limpact-dune-meteorite\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.tomsguide.fr\/la-disparition-des-dinosaures-aurait-commence-bien-avant-limpact-dune-meteorite\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2019\/12\/fossile-mercure-extinction-dinosaure.jpg\",\"datePublished\":\"2019-12-16T13:20:20+00:00\",\"dateModified\":\"2024-02-01T14:14:29+00:00\",\"description\":\"L\u2019extinction de la plupart des dinosaures n\u2019est pas uniquement due \u00e0 l\u2019impact d\u2019un ast\u00e9ro\u00efde il y a 66 millions d\u2019ann\u00e9es. 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