{"id":2346,"date":"2020-03-14T12:34:51","date_gmt":"2020-03-14T11:34:51","guid":{"rendered":"http:\/\/bordeaux167.legtux.org\/wpress\/?p=2346"},"modified":"2026-01-27T22:11:56","modified_gmt":"2026-01-27T21:11:56","slug":"a-quoi-pourrait-ressembler-la-terre-dans-200-millions-dannees","status":"publish","type":"post","link":"https:\/\/bordeaux167.legtux.org\/wpress\/a-quoi-pourrait-ressembler-la-terre-dans-200-millions-dannees\/","title":{"rendered":"\u00c0 quoi pourrait ressembler la Terre dans 200 millions d\u2019ann\u00e9es\u00a0?"},"content":{"rendered":"<header>\n<div class=\"author-wrapper\">\n<h3 class=\"author-name\">Par Mattias GREEN, Hannah Sophia DAVIES, et Joao C. DUARTE<\/h3>\n<\/div>\n<div class=\"introtext\">Dans l\u2019espace, lorsque les plaques tectoniques se rassemblent, elles forment un supercontinent qui perdure quelques centaines de millions d\u2019ann\u00e9es avant de se briser. Le prochain devrait se former d\u2019ici 200 \u00e0 250\u00a0millions d\u2019ann\u00e9es. Voici les quatre sc\u00e9narios possibles.<\/div>\n<\/header>\n<div class=\"article-body gallery\">\n<div class=\"text\">\n<p>La couche ext\u00e9rieure de la Terre, la cro\u00fbte solide sur laquelle nous marchons, est constitu\u00e9e de morceaux bris\u00e9s, un peu comme la coquille d\u2019un \u0153uf cass\u00e9. Ces morceaux, les plaques tectoniques, se d\u00e9placent autour de la plan\u00e8te \u00e0 une vitesse de quelques centim\u00e8tres par an. De temps en temps, les plaques se rassemblent et se combinent pour former un supercontinent, qui perdure quelques centaines de millions d\u2019ann\u00e9es avant de se briser. Puis les plaques se dispersent et s\u2019\u00e9loignent les unes des autres, jusqu\u2019\u00e0 ce qu\u2019elles finissent par se r\u00e9unir \u00e0 nouveau\u00a0\u2013 apr\u00e8s quelque 400 \u00e0 600 millions d\u2019ann\u00e9es.<\/p>\n<p>Le dernier supercontinent, la Pang\u00e9e, s\u2019est form\u00e9 il y a environ 310 millions d\u2019ann\u00e9es et a commenc\u00e9 \u00e0 se d\u00e9sassembler il y a environ 180 millions d\u2019ann\u00e9es. Il a \u00e9t\u00e9 sugg\u00e9r\u00e9 que le prochain supercontinent se formera dans 200-250 millions d\u2019ann\u00e9es. Nous sommes donc actuellement \u00e0 peu pr\u00e8s au milieu du cycle d\u2019assemblage et dispersion du supercontinent. La question est la suivante\u00a0: comment le prochain supercontinent se formera-t-il et pourquoi\u00a0?<\/p>\n<p>Il existe quatre sc\u00e9narios fondamentaux pour la formation du prochain supercontinent\u00a0: la nouvelle Pang\u00e9e, la Pang\u00e9e ultime, Aurica et Amasia. La formation de ces quatre supercontinents potentiels est en fait li\u00e9e \u00e0 la fa\u00e7on dont la Pang\u00e9e s\u2019est s\u00e9par\u00e9e et dont les continents du monde se d\u00e9placent encore aujourd\u2019hui.<\/p>\n<p>L\u2019\u00e9clatement de la Pang\u00e9e a conduit \u00e0 la formation de l\u2019oc\u00e9an Atlantique, qui s\u2019ouvre et s\u2019\u00e9largit encore aujourd\u2019hui. De l\u2019autre c\u00f4t\u00e9, l\u2019oc\u00e9an Pacifique se ferme et se r\u00e9tr\u00e9cit. Tout autour de l\u2019oc\u00e9an Pacifique se trouve la c\u00e9l\u00e8bre ceinture de feu du Pacifique, o\u00f9 le fond oc\u00e9anique descend par subduction sous les plaques continentales et plonge dans l\u2019int\u00e9rieur de la Terre. L\u00e0, les anciens fonds oc\u00e9aniques sont \u00ab\u00a0recycl\u00e9s\u00a0\u00bb et peuvent se transformer en panaches volcaniques. L\u2019Atlantique, en revanche, poss\u00e8de une grande dorsale oc\u00e9anique qui produit une nouvelle plaque oc\u00e9anique, mais n\u2019abrite que deux zones de subduction\u00a0: l\u2019arc des Petites Antilles dans les Cara\u00efbes et l\u2019arc des Antilles australes, situ\u00e9 entre l\u2019Am\u00e9rique du Sud et l\u2019Antarctique.<\/p>\n<h3 class=\"title-text\">1. La nouvelle Pang\u00e9e<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-6221 alignnone\" src=\"https:\/\/bordeaux167.legtux.org\/wpress\/wp-content\/uploads\/2020\/03\/pangee1.jpg\" alt=\"\" width=\"639\" height=\"326\" srcset=\"https:\/\/bordeaux167.legtux.org\/wpress\/wp-content\/uploads\/2020\/03\/pangee1.jpg 639w, https:\/\/bordeaux167.legtux.org\/wpress\/wp-content\/uploads\/2020\/03\/pangee1-300x153.jpg 300w, https:\/\/bordeaux167.legtux.org\/wpress\/wp-content\/uploads\/2020\/03\/pangee1-200x102.jpg 200w\" sizes=\"auto, (max-width: 639px) 100vw, 639px\" \/><\/p>\n<p class=\"title-text\">Si nous supposons que les conditions actuelles persistent, de sorte que l\u2019Atlantique continue \u00e0 s\u2019ouvrir et le Pacifique \u00e0 se fermer, nous avons un sc\u00e9nario dans lequel le prochain supercontinent se forme aux antipodes de la Pang\u00e9e. Les Am\u00e9riques entreraient en collision avec l\u2019Antarctique, qui d\u00e9rive vers le nord, puis avec l\u2019Afrique-Eurasie, deux plaques d\u00e9j\u00e0 en collision. Le supercontinent qui se formerait s\u2019appelle \u00ab nouvelle Pang\u00e9e \u00bb, ou Novopangea.<\/p>\n<\/div>\n<\/div>\n<h3 class=\"title-text\">2. La Pang\u00e9e ultime<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-6222 alignnone\" src=\"https:\/\/bordeaux167.legtux.org\/wpress\/wp-content\/uploads\/2020\/03\/pangee_ultime.jpg\" alt=\"\" width=\"657\" height=\"337\" srcset=\"https:\/\/bordeaux167.legtux.org\/wpress\/wp-content\/uploads\/2020\/03\/pangee_ultime.jpg 657w, https:\/\/bordeaux167.legtux.org\/wpress\/wp-content\/uploads\/2020\/03\/pangee_ultime-300x154.jpg 300w, https:\/\/bordeaux167.legtux.org\/wpress\/wp-content\/uploads\/2020\/03\/pangee_ultime-200x103.jpg 200w\" sizes=\"auto, (max-width: 657px) 100vw, 657px\" \/><\/p>\n<p>L\u2019ouverture de l\u2019Atlantique pourrait toutefois ralentir, voire m\u00eame s\u2019inverser, et l\u2019Atlantique commencer \u00e0 se fermer, tandis que les deux petits arcs de subduction dans l\u2019Atlantique s\u2019\u00e9tendraient tout le long de la c\u00f4te est des Am\u00e9riques Sud et Nord. Ceci entra\u00eenerait une recr\u00e9ation de la Pang\u00e9e\u00a0: les Am\u00e9riques, l\u2019Europe et l\u2019Afrique seraient r\u00e9unies en un supercontinent appel\u00e9 la Pang\u00e9e ultime. Ce nouveau supercontinent serait entour\u00e9 par un oc\u00e9an Pacifique g\u00e9ant.<\/p>\n<h3 class=\"title-text\">3. Aurica<\/h3>\n<p>Cependant, si l\u2019Atlantique devait d\u00e9velopper de nouvelles zones de subduction\u00a0\u2013 ce qui est peut-\u00eatre d\u00e9j\u00e0 le cas\u00a0\u2013 les oc\u00e9ans Pacifique et Atlantique pourraient tous deux \u00eatre condamn\u00e9s \u00e0 se fermer. Cela signifie qu\u2019un nouveau bassin oc\u00e9anique devrait se former pour les remplacer.<\/p>\n<p>Dans ce sc\u00e9nario, le rift pan-asiatique, qui traverse actuellement l\u2019Asie depuis l\u2019ouest de l\u2019Inde jusqu\u2019\u00e0 l\u2019Arctique, s\u2019ouvrirait pour former un nouvel oc\u00e9an et former le supercontinent Aurica. L\u2019Australie, qui d\u00e9rive actuellement vers le nord, serait au centre du nouveau continent, alors que l\u2019Asie de l\u2019Est et les Am\u00e9riques fermeraient le Pacifique de chaque c\u00f4t\u00e9. Les plaques europ\u00e9enne et africaine rejoindraient alors les Am\u00e9riques \u00e0 la fermeture de l\u2019Atlantique.<\/p>\n<div class=\"video-container\">\n<div class=\"app_videocontainer\" data-video=\"%3Ciframe%20frameborder=%220%22%20width=%22600%22%20height=%22338%22%20src=%22https:\/\/www.dailymotion.com\/embed\/video\/kOhhcx1S4uDE08vTNey?ui-logo=0&amp;ui-start-screen-info=0&amp;endscreen-enable=0%22%20allowfullscreen=%22%22%3E%3C\/iframe%3E\" data-url=\"https:&quot;https:\/\/www.dailymotion.com\/embed\/video\/kOhhcx1S4uDE08vTNey?ui-logo=0&amp;ui-start-screen-info=0&amp;endscreen-enable=0&quot;\" data-ratio=\"0.5633333333333334\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-6223 alignnone\" src=\"https:\/\/bordeaux167.legtux.org\/wpress\/wp-content\/uploads\/2020\/03\/aurica.jpg\" alt=\"\" width=\"650\" height=\"345\" srcset=\"https:\/\/bordeaux167.legtux.org\/wpress\/wp-content\/uploads\/2020\/03\/aurica.jpg 650w, https:\/\/bordeaux167.legtux.org\/wpress\/wp-content\/uploads\/2020\/03\/aurica-300x159.jpg 300w, https:\/\/bordeaux167.legtux.org\/wpress\/wp-content\/uploads\/2020\/03\/aurica-200x106.jpg 200w\" sizes=\"auto, (max-width: 650px) 100vw, 650px\" \/><\/div>\n<\/div>\n<h3 class=\"title-text\">4. Amasia<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-6224 alignnone\" src=\"https:\/\/bordeaux167.legtux.org\/wpress\/wp-content\/uploads\/2020\/03\/amasia.jpg\" alt=\"\" width=\"660\" height=\"350\" srcset=\"https:\/\/bordeaux167.legtux.org\/wpress\/wp-content\/uploads\/2020\/03\/amasia.jpg 660w, https:\/\/bordeaux167.legtux.org\/wpress\/wp-content\/uploads\/2020\/03\/amasia-300x159.jpg 300w, https:\/\/bordeaux167.legtux.org\/wpress\/wp-content\/uploads\/2020\/03\/amasia-200x106.jpg 200w\" sizes=\"auto, (max-width: 660px) 100vw, 660px\" \/><\/p>\n<p>Le destin de la Terre est compl\u00e8tement diff\u00e9rent dans le quatri\u00e8me sc\u00e9nario. Celui part de l\u2019observation, bien r\u00e9elle que plusieurs des plaques tectoniques se d\u00e9placent actuellement vers le nord, notamment l\u2019Afrique et l\u2019Australie. Cette d\u00e9rive serait due \u00e0 des anomalies laiss\u00e9es par la Pang\u00e9e dans les profondeurs de l\u2019int\u00e9rieur de la Terre, dans la partie appel\u00e9e manteau. En raison de cette d\u00e9rive vers le nord, on peut envisager un sc\u00e9nario dans lequel les continents, \u00e0 l\u2019exception de l\u2019Antarctique, continueraient \u00e0 d\u00e9river et finiraient par se rassembler autour du p\u00f4le Nord en un supercontinent appel\u00e9 Amasia. Dans ce sc\u00e9nario, l\u2019Atlantique et le Pacifique resteraient en grande partie ouverts.<\/p>\n<h3 class=\"title-text\">Penser \u00e0 l\u2019avenir<\/h3>\n<p>De ces quatre sc\u00e9narios, nous pensons que la nouvelle Pang\u00e9e est le plus probable. Il s\u2019agit d\u2019une progression logique des directions actuelles de la d\u00e9rive des plaques continentales, tandis que les trois autres supposent qu\u2019un autre processus entre en jeu. Il faudrait de nouvelles zones de subduction atlantique pour Aurica, le renversement de l\u2019ouverture atlantique pour la Pang\u00e9e ultime, ou des anomalies \u00e0 l\u2019int\u00e9rieur de la Terre laiss\u00e9es par la Pang\u00e9e pour Amasia.<\/p>\n<p>L\u2019\u00e9tude de l\u2019avenir tectonique de la Terre nous oblige \u00e0 repousser les limites de nos connaissances et \u00e0 r\u00e9fl\u00e9chir aux processus qui fa\u00e7onnent notre plan\u00e8te sur de longues \u00e9chelles de temps. Elle nous am\u00e8ne \u00e9galement \u00e0 r\u00e9fl\u00e9chir sur le syst\u00e8me terrestre dans son ensemble et soul\u00e8ve une s\u00e9rie de questions\u00a0: quel sera le climat du prochain supercontinent\u00a0? Comment la circulation oc\u00e9anique s\u2019adaptera-t-elle\u00a0? Comment la vie \u00e9voluera-t-elle et s\u2019adaptera-t-elle\u00a0? Ce genre de questions repoussent les limites de la science parce qu\u2019elles repoussent les limites de notre imagination.<\/p>\n<p><i>Par Mattias GREEN, ma\u00eetre de conf\u00e9rences en oc\u00e9anographie physique, Universit\u00e9 de Bangor (Royaume-Uni), Hannah Sophia DAVIES, chercheuse PhD, Universit\u00e9 de Lisbonne (Portugal) et Joao C. DUARTE, chercheur et coordinateur du groupe de g\u00e9ologie et g\u00e9ophysique marines, Universit\u00e9 de Lisbonne (Portugal)<\/i><\/p>\n<p><a class=\"twp-link\" href=\"https:\/\/theconversation.com\/a-quoi-pourrait-ressembler-la-terre-lorsque-le-prochain-supercontinent-se-formera-133378\">La version originale de cet article a \u00e9t\u00e9 publi\u00e9e dans <i>The Conversation<\/i>.<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Par Mattias GREEN, Hannah Sophia DAVIES, et Joao C. DUARTE Dans l\u2019espace, lorsque les plaques <a class=\"read-more\" href=\"https:\/\/bordeaux167.legtux.org\/wpress\/a-quoi-pourrait-ressembler-la-terre-dans-200-millions-dannees\/\">Lire la suite<\/a><\/p>\n","protected":false},"author":1,"featured_media":2347,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-2346","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-publication","post-item clearfix"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u00c0 quoi pourrait ressembler la Terre dans 200 millions d\u2019ann\u00e9es\u00a0? - Bordeaux 167<\/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:\/\/bordeaux167.legtux.org\/wpress\/a-quoi-pourrait-ressembler-la-terre-dans-200-millions-dannees\/\" class=\"yoast-seo-meta-tag\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" class=\"yoast-seo-meta-tag\" \/>\n<meta property=\"og:type\" content=\"article\" class=\"yoast-seo-meta-tag\" \/>\n<meta property=\"og:title\" content=\"\u00c0 quoi pourrait ressembler la Terre dans 200 millions d\u2019ann\u00e9es\u00a0? - Bordeaux 167\" class=\"yoast-seo-meta-tag\" \/>\n<meta property=\"og:description\" content=\"Par Mattias GREEN, Hannah Sophia DAVIES, et Joao C. 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