{"id":25082,"date":"2023-07-23T12:00:55","date_gmt":"2023-07-23T10:00:55","guid":{"rendered":"https:\/\/www.laterredufutur.com\/accueil\/?p=25082"},"modified":"2023-07-17T09:13:52","modified_gmt":"2023-07-17T07:13:52","slug":"le-continent-africain-se-separe-en-deux","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/le-continent-africain-se-separe-en-deux\/","title":{"rendered":"Le continent africain se s\u00e9pare en deux"},"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 faille massive pourrait d\u00e9chirer l&rsquo;Afrique en deux et former le sixi\u00e8me oc\u00e9an de la Terre. Le noyau de notre plan\u00e8te, qui \u00e9jecte de la roche surchauff\u00e9e, pourrait m\u00eame acc\u00e9l\u00e9rer cette s\u00e9paration.<\/p>\n<p>Le saviez-vous : une faille g\u00e9ante d\u00e9chire lentement l&rsquo;Afrique, le deuxi\u00e8me plus grand continent du monde. On appelle ce ph\u00e9nom\u00e8ne le \u00ab\u00a0rift est-africain\u00a0\u00bb, car il s&rsquo;\u00e9tend sur 3 500 kilom\u00e8tres de long, de l&rsquo;Afar, la r\u00e9gion \u00e9thiopienne proche de la Mer rouge, au Nord, jusqu&rsquo;au Golfe du Mozambique, au Sud. Il s&rsquo;agit d&rsquo;un mouvement des plaques tectoniques qui se s\u00e9parent \u00e0 cet endroit, qui a d\u00e9but\u00e9 il y a 25 millions d&rsquo;ann\u00e9es et qui pourrait finir par \u00e9carteler le continent et cr\u00e9er un sixi\u00e8me oc\u00e9an.<\/p>\n<p>Un mouvement lent<br \/>\n\u00ab\u00a0Plusieurs ph\u00e9nom\u00e8nes g\u00e9ologiques agissent ensemble pour casser la lithosph\u00e8re (la couche sup\u00e9rieure de la Terre) africaine, \u00e9paisse d\u2019environ 100 km\u00a0\u00bb, explique notamment un article du CNRS. Cependant, avant de voir une fissure appara\u00eetre en Afrique, il faudra attendre un certain temps : \u00ab\u00a0L&rsquo;ouverture de ce rift s\u2019av\u00e8re particuli\u00e8rement difficile et se fait \u00e0 une vitesse estim\u00e9e d\u2019environ 7 mm par an\u00a0\u00bb, ajoutent les experts du centre de recherche fran\u00e7ais. \u00ab\u00a0C&rsquo;est \u00e0 peu pr\u00e8s \u00e0 la vitesse \u00e0 laquelle les ongles poussent\u00a0\u00bb, souligne de son c\u00f4t\u00e9 Live Science. \u00c0 titre de comparaison, le rift est-africain bouge quatre fois plus lentement que la dorsale m\u00e9dio-atlantique (une cha\u00eene de montagne sous-marine qui correspond \u00e0 la faille sismique qui traverse l&rsquo;oc\u00e9an du Nord au Sud) qui agrandit l&rsquo;oc\u00e9an Atlantique de 3 cm par an environ.<\/p>\n<blockquote class=\"twitter-tweet\" data-width=\"500\" data-dnt=\"true\">\n<p lang=\"fr\" dir=\"ltr\">\u00c0 l\u2019est du continent Africain, la terre se fracture depuis 25 millions d\u2019ann\u00e9es <a href=\"https:\/\/t.co\/U674yGubOF\">https:\/\/t.co\/U674yGubOF<\/a> \u00c0 l\u2019origine: le rift Est-Africain qui annonce l\u2019ouverture d\u2019un futur oc\u00e9an, avec de nombreux enjeux li\u00e9s \u00e0 la gestion des ressources et des risques<\/p>\n<p>@INSU_CNRS <a href=\"https:\/\/twitter.com\/CNRS?ref_src=twsrc%5Etfw\">@CNRS<\/a> <a href=\"https:\/\/twitter.com\/GeoMontp?ref_src=twsrc%5Etfw\">@GeoMontp<\/a> <a href=\"https:\/\/t.co\/c7DZN4ACCd\">pic.twitter.com\/c7DZN4ACCd<\/a><\/p>\n<p>&mdash; Alain Schuhl (@AlainSchuhl) <a href=\"https:\/\/twitter.com\/AlainSchuhl\/status\/1556898075062505472?ref_src=twsrc%5Etfw\">August 9, 2022<\/a><\/p><\/blockquote>\n<p><script async src=\"https:\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script><\/p>\n<p>Comme vous pouvez le constater ci-dessus, le rift cr\u00e9e une faille en forme de Y au nord, dans la r\u00e9gion de l&rsquo;Afar, aussi appel\u00e9e la vall\u00e9e du Grand Rift, du fait du croisement de plusieurs plaques tectoniques qui s&rsquo;\u00e9cartent (la plaque somalienne \u00e0 l&rsquo;Est, la plaque africaine \u00e0 l&rsquo;Ouest, et la plaque arabique au Nord), et descend ensuite en cr\u00e9ant deux ensembles parall\u00e8les de fractures dans la cro\u00fbte terrestre. Le rift oriental traverse l&rsquo;\u00c9thiopie et le Kenya, tandis que le rift occidental s&rsquo;\u00e9tend en arc de cercle de l&rsquo;Ouganda au Malawi. La branche Est correspond \u00e0 une terre aride, alors que la branche Ouest se situe \u00e0 la fronti\u00e8re de la for\u00eat tropicale congolaise. Entre les deux, se tient le g\u00e9ant lac Victoria, entre le Kenya, l&rsquo;Ouganda et la Tanzanie.<\/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<blockquote class=\"twitter-tweet\" data-width=\"500\" data-dnt=\"true\">\n<p lang=\"en\" dir=\"ltr\">FACT: The East African Rift Valley stretches over 3,000km from the Gulf of Aden in the north down to Zimbabwe in the south. <a href=\"https:\/\/t.co\/zZWbtA9UFa\">pic.twitter.com\/zZWbtA9UFa<\/a><\/p>\n<p>&mdash; Facts East Africa (@east_facts) <a href=\"https:\/\/twitter.com\/east_facts\/status\/1409453914978766849?ref_src=twsrc%5Etfw\">June 28, 2021<\/a><\/p><\/blockquote>\n<p><script async src=\"https:\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script><\/p>\n<p>Vers la formation d&rsquo;un plancher oc\u00e9anique<br \/>\nCette fracture est un signe de l&rsquo;activit\u00e9 de la plan\u00e8te. Dans un article paru dans The Conversation, Lucia Perez Diaz, de l&rsquo;universit\u00e9 de Londres, fait le lien entre cet \u00e9v\u00e8nement et les ph\u00e9nom\u00e8nes g\u00e9ologiques au niveau du rift est-africain. Du point de vue de la tectonique des plaques, ce rift marque la limite entre la plaque africaine \u00e0 l&rsquo;ouest et la plaque somalienne \u00e0 l&rsquo;est.<\/p>\n<p>La vall\u00e9e du grand rift s&rsquo;\u00e9tend sur des milliers de kilom\u00e8tres, du golfe d&rsquo;Aden, au nord, jusqu&rsquo;au Zimbabwe, au sud. Un rift correspond \u00e0 une zone o\u00f9 la lithosph\u00e8re s&rsquo;amincit, \u00e0 cause de forces d&rsquo;extension horizontales. C&rsquo;est la premi\u00e8re \u00e9tape avant la cassure du continent et la cr\u00e9ation d&rsquo;un oc\u00e9an, un processus tr\u00e8s lent.<\/p>\n<p>Ces mouvements s&rsquo;accompagnent de ph\u00e9nom\u00e8nes sismiques et volcaniques, li\u00e9s \u00e0 la mont\u00e9e de l&rsquo;asth\u00e9nosph\u00e8re \u00e0 cet endroit. Si le processus se poursuit, petit \u00e0 petit, la corne de l\u2019Afrique, avec la Somalie et des morceaux d&rsquo;\u00c9thiopie, du Kenya et de la Tanzanie, formera une \u00eele qui s&rsquo;\u00e9loignera du continent africain. Mais il faudra encore attendre des dizaines de millions d&rsquo;ann\u00e9es pour que cette \u00ab \u00eele \u00bb se d\u00e9tache&#8230;<\/p>\n<p><span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/wO7s5zIhX6k?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=fr-FR&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox\"><\/iframe><\/span><\/p>\n<p>sources : <a href=\"https:\/\/www.caminteresse.fr\/insolite\/le-continent-africain-pourrait-bien-finir-par-se-separer-en-deux-11189196\/\" rel=\"noopener\" target=\"_blank\">https:\/\/www.caminteresse.fr\/<\/a> \/ <a href=\"https:\/\/www.linternaute.com\/actualite\/3173045-article\/\" rel=\"noopener\" target=\"_blank\">https:\/\/www.linternaute.com\/<\/a> \/ <a href=\"https:\/\/merespace.com\/journal\/351_rift-africain-s%C3%A9paration\" rel=\"noopener\" target=\"_blank\">https:\/\/merespace.com\/<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"25082\">(721)<\/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 faille massive pourrait d\u00e9chirer l&rsquo;Afrique en deux et former le sixi\u00e8me oc\u00e9an de la Terre. Le noyau de notre&#8230;<\/p>\n","protected":false},"author":1,"featured_media":25083,"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_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":"Le continent africain se s\u00e9pare en deux @laterredufutur.com Terra Projects","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[19],"tags":[8029,196,128,241,8028,684],"class_list":["post-25082","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seismes-et-volcans","tag-africain","tag-afrique","tag-futur","tag-ocean","tag-rift","tag-video","wpcat-19-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/07\/rift-africain.jpg?fit=1024%2C576&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-6wy","jetpack-related-posts":[{"id":28127,"url":"https:\/\/www.laterredufutur.com\/accueil\/lafrique-se-fragmente-plus-vite-quon-ne-le-pensait-formant-un-nouvel-ocean\/","url_meta":{"origin":25082,"position":0},"title":"L&rsquo;Afrique se fragmente plus vite qu&rsquo;on ne le pensait, formant un nouvel oc\u00e9an","author":"Admin","date":"12 mai 2026","format":false,"excerpt":"Des g\u00e9ologues ont d\u00e9couvert que le continent africain se fragmentera plus t\u00f4t qu'on ne le pensait. Une faille active a atteint un seuil critique et se rompra bient\u00f4t, donnant naissance \u00e0 un nouvel oc\u00e9an. Cela dit, \u00ab bient\u00f4t \u00bb est un terme relatif \u2013 il faudra encore quelques millions d\u2019ann\u00e9es,\u2026","rel":"","context":"Dans &quot;Seismes\/Volcans&quot;","block_context":{"text":"Seismes\/Volcans","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/seismes-et-volcans\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/05\/rift-africain-1-1.jpg?fit=1200%2C801&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/05\/rift-africain-1-1.jpg?fit=1200%2C801&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/05\/rift-africain-1-1.jpg?fit=1200%2C801&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/05\/rift-africain-1-1.jpg?fit=1200%2C801&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/05\/rift-africain-1-1.jpg?fit=1200%2C801&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":16494,"url":"https:\/\/www.laterredufutur.com\/accueil\/kenya-quand-la-vallee-du-rift-se-brise-pour-un-futur-ocean\/","url_meta":{"origin":25082,"position":1},"title":"Kenya, quand la vall\u00e9e du Rift se brise pour un futur oc\u00e9an","author":"Admin","date":"12 avril 2018","format":false,"excerpt":"Le 2 avril 2018, la terre s'est ouverte dans la r\u00e9gion de Narok, le long de la vall\u00e9e du Rift, dans le sud-ouest du pays. La faille a commenc\u00e9 \u00e0 s'ouvrir le 18 mars 2018. AU KENYA, la terre s'est ouverte en deux, brisant les routes et les maisons dans\u2026","rel":"","context":"Dans &quot;Seismes\/Volcans&quot;","block_context":{"text":"Seismes\/Volcans","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/seismes-et-volcans\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/04\/faille-valle-rift-0.jpg?fit=1200%2C675&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/04\/faille-valle-rift-0.jpg?fit=1200%2C675&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/04\/faille-valle-rift-0.jpg?fit=1200%2C675&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/04\/faille-valle-rift-0.jpg?fit=1200%2C675&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/04\/faille-valle-rift-0.jpg?fit=1200%2C675&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":26812,"url":"https:\/\/www.laterredufutur.com\/accueil\/des-eruptions-magmatiques-massives-pourraient-avoir-dechire-lafrique-et-lamerique-du-sud\/","url_meta":{"origin":25082,"position":2},"title":"Des \u00e9ruptions magmatiques massives pourraient avoir d\u00e9chir\u00e9 l&rsquo;Afrique et l&rsquo;Am\u00e9rique du Sud","author":"Admin","date":"8 avril 2025","format":false,"excerpt":"D'\u00e9normes coul\u00e9es de magma ont accompagn\u00e9 la s\u00e9paration entre l'Am\u00e9rique du Sud et l'Afrique il y a 135 millions d'ann\u00e9es. Selon de nouvelles recherches, la s\u00e9paration entre l'Am\u00e9rique du Sud et l'Afrique, il y a 135 millions d'ann\u00e9es, a \u00e9t\u00e9 une affaire br\u00fblante. La rupture continentale a rejet\u00e9 plus de\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/04\/separation-afrique-et-amerique-du-sud.jpg?fit=1024%2C1024&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/04\/separation-afrique-et-amerique-du-sud.jpg?fit=1024%2C1024&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/04\/separation-afrique-et-amerique-du-sud.jpg?fit=1024%2C1024&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/04\/separation-afrique-et-amerique-du-sud.jpg?fit=1024%2C1024&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":15928,"url":"https:\/\/www.laterredufutur.com\/accueil\/el-nino-le-volcanisme-et-les-moussons-africaines\/","url_meta":{"origin":25082,"position":3},"title":"El Nino, le volcanisme, et les moussons africaines","author":"Admin","date":"11 octobre 2017","format":false,"excerpt":"Une \u00e9tude internationale, coordonn\u00e9e par une chercheuse de l'IRD, montre que les \u00e9ruptions volcaniques stratosph\u00e9riques peuvent d\u00e9clencher des \u00e9v\u00e9nements El Ni\u00f1o dans le Pacifique. Les chercheurs ont identifi\u00e9 pour la premi\u00e8re fois les m\u00e9canismes physiques \u00e0 l'\u0153uvre : le refroidissement de la surface du continent africain, qui diminue l'intensit\u00e9 de\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/12\/volcan-Momotombo.jpg?fit=1024%2C683&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/12\/volcan-Momotombo.jpg?fit=1024%2C683&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/12\/volcan-Momotombo.jpg?fit=1024%2C683&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/12\/volcan-Momotombo.jpg?fit=1024%2C683&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":26514,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-nasa-observe-une-vaste-anomalie-en-croissance-dans-le-champ-magnetique-terrestre\/","url_meta":{"origin":25082,"position":4},"title":"La NASA observe une vaste anomalie en croissance dans le champ magn\u00e9tique terrestre","author":"Admin","date":"8 janvier 2025","format":false,"excerpt":"La NASA surveille une \u00e9trange anomalie dans le champ magn\u00e9tique terrestre : une gigantesque r\u00e9gion de faible intensit\u00e9 magn\u00e9tique dans le ciel de la plan\u00e8te, qui s'\u00e9tend entre l'Am\u00e9rique du Sud et le sud-ouest de l'Afrique. 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