{"id":4753,"date":"2009-02-02T19:03:56","date_gmt":"2009-02-02T17:03:56","guid":{"rendered":"http:\/\/www.laterredufutur.com\/accueil1\/?p=4753"},"modified":"2015-04-13T19:05:42","modified_gmt":"2015-04-13T17:05:42","slug":"les-mammouths-auraient-disparu-a-cause-dune-comete","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/les-mammouths-auraient-disparu-a-cause-dune-comete\/","title":{"rendered":"Les mammouths auraient disparu \u00e0 cause d&rsquo;une com\u00e8te"},"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 align=\"justify\"><span style=\"font-size: small;\">En 2007, un ar\u00e9opage constitu\u00e9 de 26 membres de 16 institutions avait pr\u00e9sent\u00e9 une s\u00e9rie d\u2019arguments extr\u00eamement convaincants concernant la disparition des mammouths nord-am\u00e9ricains. Un nouvel article publi\u00e9 dans Science confirme \u00e0 nouveau la pr\u00e9sence de grandes quantit\u00e9s de nanodiamants, indice de la chute d\u2019un corps c\u00e9leste, dans les couches contemporaines de l\u2019extinction.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">On se souvient de l\u2019article publi\u00e9 dans Proceedings of the National Academy of Sciences en 2007, et de la conf\u00e9rence d\u2019Acapulco disponible sur YouTube, exposant la th\u00e9orie expliquant la cause de la brusque p\u00e9riode froide connue sous le nom de Dryas r\u00e9cent survenue il y a 12.900 ans environ.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Un petit corps c\u00e9leste, probablement une com\u00e8te, serait tomb\u00e9 sur l\u2019Am\u00e9rique du Nord entra\u00eenant la vidange du lac Agassiz dans l\u2019Atlantique nord conduisant \u00e0 interrompre ou au moins r\u00e9duire la circulation thermohaline, comme celle du Gulf Stream. Le refroidissement du climat qui en aurait r\u00e9sult\u00e9 serait la cause, non seulement de la disparition des mammouths nord-am\u00e9ricains, mais il aurait aussi acc\u00e9l\u00e9r\u00e9 la s\u00e9dentarisation de l\u2019homme et la d\u00e9couverte de l\u2019agriculture au Moyen-orient.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Les Natoufiens en particulier, afin de survivre \u00e0 la rar\u00e9faction des ressources alimentaires, auraient peut-\u00eatre ainsi \u00e9t\u00e9 responsables de la r\u00e9volution n\u00e9olithique. La th\u00e8se est cependant controvers\u00e9e. Il semble en effet que la r\u00e9volution n\u00e9olithique a \u00e9t\u00e9 progressive.<\/span><\/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<p align=\"justify\"><span style=\"font-size: small;\">Dans l\u2019article publi\u00e9 d\u00e9but Janvier dans Science, l\u2019arch\u00e9ologue am\u00e9ricain de l\u2019universit\u00e9 de l\u2019Oregon, Douglas J. Kennett, qui faisait d\u00e9j\u00e0 partie de l\u2019\u00e9quipe initiale ayant propos\u00e9 la th\u00e9orie de la com\u00e8te tueuse de mammouths, annonce que lui et ses coll\u00e8gues ont trouv\u00e9 plusieurs milliards de nanodiamants dans la couche de s\u00e9diments datant du d\u00e9but du Dryas r\u00e9cent en six sites en Am\u00e9rique du Nord.<\/span><\/p>\n<p align=\"center\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/spaw\/images\/dryas.jpg\" alt=\"\" \/><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">De tels nanodiamants (associ\u00e9s de plus \u00e0 un pic d&rsquo;iridium comme dans le cas de la crise KT, cr\u00e9tac\u00e9-tertiaire) ne peuvent provenir que de l\u2019impact d\u2019un corps c\u00e9leste, tr\u00e8s probablement sous forme de fragments d\u2019une com\u00e8te ou d&rsquo;une chondrite carbon\u00e9e. On ne les trouve ni avant ni apr\u00e8s la couche de s\u00e9diments marquant l\u2019apparition de la p\u00e9riode froide ayant dur\u00e9 environ 1.300 ans et qui co\u00efncide avec la disparition de plusieurs esp\u00e8ces embl\u00e9matiques de la pr\u00e9histoire, comme le mammouth et le tigre \u00e0 dents de sabre.<br \/>\nIl s\u2019agit donc d\u2019un argument extr\u00eamement fort en faveur de la th\u00e8se d\u2019un impact d\u2019un corps c\u00e9leste responsable \u00e0 la fois d\u2019une extinction massive d\u2019esp\u00e8ces et mais de la disparition de la culture pr\u00e9historique des Clovis, un groupe de chasseurs-cueilleurs apparu en Am\u00e9rique du Nord peu avant le d\u00e9but du Dryas r\u00e9cent.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">source : <a href=\"http:\/\/www.futura-sciences.com\/\">http:\/\/www.futura-sciences.com\/<\/a><\/span><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"4753\">(382)<\/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>En 2007, un ar\u00e9opage constitu\u00e9 de 26 membres de 16 institutions avait pr\u00e9sent\u00e9 une s\u00e9rie d\u2019arguments extr\u00eamement convaincants concernant la&#8230;<\/p>\n","protected":false},"author":1,"featured_media":4754,"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":"","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}},"categories":[33],"tags":[3177,735,1521,884,1609,528,951,535],"class_list":["post-4753","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-archeologie","tag-12000-ans","tag-alimentaire","tag-comete","tag-cratere","tag-disparition","tag-extinction","tag-mammouth","tag-ressources","wpcat-33-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/NewMeteorCraterMinn.gif?fit=600%2C464&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-1eF","jetpack-related-posts":[{"id":1470,"url":"https:\/\/www.laterredufutur.com\/accueil\/du-nouveau-sur-la-comete-clovis\/","url_meta":{"origin":4753,"position":0},"title":"Du nouveau sur la com\u00e8te Clovis","author":"Admin","date":"6 ao\u00fbt 2013","format":false,"excerpt":"Il y a 13 000 ans, une pluie de com\u00e8tes a congel\u00e9 la Terre. En Am\u00e9rique du Nord, la civilisation dite de Clovis n'aurait pas surv\u00e9cu \u00e0 ce cataclysme. C'est ainsi qu'en 2010, et en ces termes que nous sortions un article sur la Terre du Futur. L'\u00e9tude de la\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":"","width":0,"height":0},"classes":[]},{"id":4654,"url":"https:\/\/www.laterredufutur.com\/accueil\/une-supernova-responsable-de-lextinction-des-mammouths\/","url_meta":{"origin":4753,"position":1},"title":"Une supernova responsable de l&rsquo;extinction des mammouths ?","author":"Admin","date":"27 octobre 2008","format":false,"excerpt":"Les mammouths ont disparu de notre plan\u00e8te voil\u00e0 13 000 ans avec de nombreux autres animaux en Am\u00e9rique du Nord. Qu'est ce qui a provoqu\u00e9 cette extinction ? L\u2019explosion d\u2019une supernova en serait responsable selon Richard Firestone, un scientifique de l'atome et le g\u00e9ologue Allen West. Ev\u00e8nements en cha\u00eene Mammouth\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\/spaw\/images\/mammouth.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":4042,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-comete-tueuse-des-hommes-des-cavernes\/","url_meta":{"origin":4753,"position":2},"title":"La Com\u00e8te tueuse des hommes des cavernes","author":"Admin","date":"24 juin 2007","format":false,"excerpt":"Une nouvelle th\u00e9orie tr\u00e8s cr\u00e9dible et impressionnante de la part de g\u00e9ologues : les hommes des cavernes (Age de pierre) auraient \u00e9t\u00e9 frapp\u00e9s par une \u00e9norme com\u00e8te. Les d\u00e9g\u00e2ts sur la plan\u00e8te auraient \u00e9t\u00e9 consid\u00e9rables \u00e0 cette \u00e9poque. Pour certains chercheurs, on vient de comprendre qu'une com\u00e8te a explos\u00e9 au\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":26904,"url":"https:\/\/www.laterredufutur.com\/accueil\/il-y-a-12900-ans-la-comete-clovis-aussi-appelee-la-comete-du-younger-dryas-frappait-notre-monde\/","url_meta":{"origin":4753,"position":3},"title":"Il y a environ 12900 ans, la com\u00e8te Clovis aussi appel\u00e9e la com\u00e8te du Younger Dryas frappait notre monde","author":"Admin","date":"18 mai 2025","format":false,"excerpt":"En 2007, un groupe de chercheurs, dirig\u00e9 par un physicien nucl\u00e9aire nomm\u00e9 Richard Firestone, a annonc\u00e9 une d\u00e9couverte \u00e9tonnante. Ils ont trouv\u00e9 la preuve qu'il y a 12 900 ans, une com\u00e8te - ou peut-\u00eatre toute une flotte de com\u00e8tes - a frapp\u00e9 la Terre et chang\u00e9 le cours 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\/2019\/03\/mammouth-feu.jpg?fit=1050%2C590&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/03\/mammouth-feu.jpg?fit=1050%2C590&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/03\/mammouth-feu.jpg?fit=1050%2C590&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/03\/mammouth-feu.jpg?fit=1050%2C590&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/03\/mammouth-feu.jpg?fit=1050%2C590&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":5566,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-comete-clovis\/","url_meta":{"origin":4753,"position":4},"title":"La com\u00e8te Clovis","author":"Admin","date":"5 novembre 2010","format":false,"excerpt":"Il y a 13 000 ans, une pluie de com\u00e8tes a congel\u00e9 la Terre. En Am\u00e9rique du Nord, la civilisation dite de Clovis n'aurait pas surv\u00e9cu \u00e0 ce cataclysme. L'\u00e9tude de la pr\u00e9histoire est l\u00e0 pour nous rappeler que les catastrophes climatiques peuvent aussi avoir des causes totalement ext\u00e9rieures au\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\/spaw\/images\/clovis_1.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":17172,"url":"https:\/\/www.laterredufutur.com\/accueil\/un-cratere-dimpact-geant-decouvert-au-groenland\/","url_meta":{"origin":4753,"position":5},"title":"Un crat\u00e8re d&rsquo;impact g\u00e9ant d\u00e9couvert au Groenland","author":"Admin","date":"19 novembre 2018","format":false,"excerpt":"Une d\u00e9pression de 31 kilom\u00e8tres de diam\u00e8tre sous un glacier du Groenland vient d'\u00eatre d\u00e9couverte. Il pourrait s'agir d'un crat\u00e8re d'impact et si tel est le cas, il pourrait \u00eatre si jeune qu'il serait contemporain des Hommes. Il serait peut-\u00eatre li\u00e9 \u00e0 l'extinction des mammouths en Am\u00e9rique du Nord. Il\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\/2018\/11\/crat%C3%A8re-meteorite-groenland.jpg?fit=680%2C382&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/11\/crat%C3%A8re-meteorite-groenland.jpg?fit=680%2C382&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/11\/crat%C3%A8re-meteorite-groenland.jpg?fit=680%2C382&ssl=1&resize=525%2C300 1.5x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/4753","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/comments?post=4753"}],"version-history":[{"count":1,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/4753\/revisions"}],"predecessor-version":[{"id":4755,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/4753\/revisions\/4755"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/4754"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=4753"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=4753"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=4753"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}