{"id":16784,"date":"2018-08-04T20:00:13","date_gmt":"2018-08-04T18:00:13","guid":{"rendered":"http:\/\/www.laterredufutur.com\/accueil\/?p=16784"},"modified":"2018-07-18T14:35:53","modified_gmt":"2018-07-18T12:35:53","slug":"un-morceau-damerique-dans-le-nord-de-laustralie-decouvert","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/un-morceau-damerique-dans-le-nord-de-laustralie-decouvert\/","title":{"rendered":"Un morceau d\u2019Am\u00e9rique dans le nord de l\u2019Australie d\u00e9couvert"},"content":{"rendered":"<div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"1\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<p>Une \u00e9quipe de chercheurs du Earth Dynamics Research Group, de l\u2019Universit\u00e9 Curtin (Australie), annonce avoir d\u00e9couvert la pr\u00e9sence de roches dans le nord du Queensland, qui pr\u00e9sentent des similitudes frappantes avec celles retrouv\u00e9es en Am\u00e9rique du Nord. Cela pourrait sugg\u00e9rer qu\u2019une portion du nord de l\u2019Australie faisait partie de l\u2019Am\u00e9rique du Nord il y a 1,7 milliard d\u2019ann\u00e9es\u2009!<\/p>\n<p>Une r\u00e9cente \u00e9tude publi\u00e9e par la Geological Society of America a conclu que des roches retrouv\u00e9es \u00e0 Georgetown, pr\u00e9cis\u00e9ment \u00e0 412 kilom\u00e8tres \u00e0 l\u2019ouest de Cairns, pr\u00e9sentent des signatures inconnues en Australie. En revanche, ces derni\u00e8res ressemblent \u00e9tonnamment \u00e0 celles que l\u2019on peut actuellement trouver au Canada. Des r\u00e9sultats significatifs qui d\u00e9bloquent des informations importantes sur le supercontinent Nuna \u2013 parfois appel\u00e9 le supercontinent Columbia \u2013 pr\u00e9sent sur Terre il y a environ 1,7 milliard d\u2019ann\u00e9es. Les roches de Georgetown se seraient finalement d\u00e9tach\u00e9es il y a environ 1,6 milliard d\u2019ann\u00e9es de ce qui est de nos jours le continent nord-am\u00e9ricain, d\u00e9rivant pendant 100 millions d\u2019ann\u00e9es avant de finir par entrer en collision avec ce qui est aujourd\u2019hui le nord de l\u2019Australie.<\/p><div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"2\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n\n<figure id=\"attachment_16785\" aria-describedby=\"caption-attachment-16785\" style=\"width: 636px\" class=\"wp-caption alignnone\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"16785\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/un-morceau-damerique-dans-le-nord-de-laustralie-decouvert\/georgetown\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/07\/pangee.jpg?fit=636%2C382&amp;ssl=1\" data-orig-size=\"636,382\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;Georgetown Terrane used to be part of North America, now part of Australia&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;Georgetown&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Georgetown\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Georgetown Terrane used to be part of North America, now part of Australia&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/07\/pangee.jpg?fit=636%2C382&amp;ssl=1\" class=\"size-full wp-image-16785\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/07\/pangee.jpg?resize=636%2C382\" alt=\"\" width=\"636\" height=\"382\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/07\/pangee.jpg?w=636&amp;ssl=1 636w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/07\/pangee.jpg?resize=300%2C180&amp;ssl=1 300w\" sizes=\"auto, (max-width: 636px) 100vw, 636px\" \/><figcaption id=\"caption-attachment-16785\" class=\"wp-caption-text\">Georgetown Terrane used to be part of North America, now part of Australia<\/figcaption><\/figure>\n<p>\u00ab\u2009Notre recherche montre qu\u2019il y a environ 1,7 milliard d\u2019ann\u00e9es, les roches de Georgetown se sont d\u00e9pos\u00e9es dans une mer peu profonde alors que la r\u00e9gion faisait partie de l\u2019Am\u00e9rique du Nord\u2009\u00bb, note Adam Nordsvan, de l\u2019\u00c9cole des sciences de la Terre et des plan\u00e8tes de l\u2019Universit\u00e9 Curtin situ\u00e9e \u00e0 Perth. Les chercheurs ont par ailleurs d\u00e9termin\u00e9 que lorsque le supercontinent Nuna s\u2019est bris\u00e9 environ 300 millions d\u2019ann\u00e9es plus tard, la r\u00e9gion de Georgetown ne s\u2019est pas \u00e9loign\u00e9e, se maintenant en Australie.<\/p>\n<p>Le lien entre les deux continents au cours de cette p\u00e9riode avait d\u00e9j\u00e0 \u00e9t\u00e9 propos\u00e9 il y a plusieurs ann\u00e9es, mais les preuves l\u2019attestant restaient \u00e0 ce jour peu probantes. Le supercontinent le plus connu \u2013 la Pang\u00e9e \u2013 s\u2019est bris\u00e9 il y a environ 175 millions d\u2019ann\u00e9es. S\u2019il reste le plus c\u00e9l\u00e8bre, ce n\u2019\u00e9tait donc pas le premier, puisqu\u2019un certain nombre de supercontinents sont se effectivement form\u00e9s bien avant, y compris Nuna.<\/p>\n<p>source : <a href=\"https:\/\/sciencepost.fr\/2018\/01\/chercheurs-decouvrent-morceau-damerique-nord-de-laustralie\/\" target=\"_blank\" rel=\"noopener\">https:\/\/sciencepost.fr\/<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"16784\">(620)<\/p>\n<!--CusAds0-->\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Une \u00e9quipe de chercheurs du Earth Dynamics Research Group, de l\u2019Universit\u00e9 Curtin (Australie), annonce avoir d\u00e9couvert la pr\u00e9sence de roches&#8230;<\/p>\n","protected":false},"author":1,"featured_media":16785,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"ngg_post_thumbnail":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"Un morceau d\u2019Am\u00e9rique dans le nord de l\u2019Australie d\u00e9couvert @laterredufutur","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[19],"tags":[197,221,1253,6411],"class_list":["post-16784","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seismes-et-volcans","tag-amerique","tag-australie","tag-continent","tag-pangee","wpcat-19-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/07\/pangee.jpg?fit=636%2C382&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-4mI","jetpack-related-posts":[{"id":1764,"url":"https:\/\/www.laterredufutur.com\/accueil\/lhemisphere-sud-entre-canicules-et-banquise\/","url_meta":{"origin":16784,"position":0},"title":"L&rsquo;h\u00e9misph\u00e8re sud, entre canicules et banquise","author":"Admin","date":"7 janvier 2014","format":false,"excerpt":"Pendant qu'une vague de froid terrasse l'Am\u00e9rique du Nord, du pas vu depuis 20 ans, l'Am\u00e9rique du Sud et l'Australie connaissent des temp\u00e9ratures exceptionnellement chaudes. 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