{"id":18048,"date":"2019-01-26T07:00:33","date_gmt":"2019-01-26T06:00:33","guid":{"rendered":"https:\/\/www.laterredufutur.com\/accueil\/?p=18048"},"modified":"2019-01-25T10:09:58","modified_gmt":"2019-01-25T09:09:58","slug":"un-enorme-cratere-decouvert-au-groenland-datant-du-dryas","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/un-enorme-cratere-decouvert-au-groenland-datant-du-dryas\/","title":{"rendered":"Un \u00e9norme crat\u00e8re d\u00e9couvert au Groenland datant du Dryas"},"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 \u00e9tude sur les glaciers du Groenland a mis au jour des preuves sugg\u00e9rant qu&rsquo;un ast\u00e9ro\u00efde de fer d&rsquo;un kilom\u00e8tre de large a percut\u00e9 cette \u00eele, il y a peut-\u00eatre 12 000 \u00e0 13000 ans \u00e0 la fin du Pl\u00e9istoc\u00e8ne. Le crat\u00e8re d&rsquo;impact est large de 30 km, et il est rest\u00e9 cach\u00e9 sous une \u00e9paisse couche de glace de 500 m d&rsquo;\u00e9paisseur jusqu&rsquo;\u00e0 aujourd&rsquo;hui. Il a r\u00e9cemment \u00e9t\u00e9 d\u00e9tect\u00e9 par un syst\u00e8me radar \u00e0 bande ultra-large d\u00e9velopp\u00e9 par le Centre de t\u00e9l\u00e9d\u00e9tection des glaciers (CReSIS), dont le si\u00e8ge est \u00e0 l&rsquo;Universit\u00e9 du Kansas.<\/p>\n<p>Le crat\u00e8re d&rsquo;impact situ\u00e9 sous le glacier Hiawatha, dans le nord-ouest du Groenland, est d\u00e9crit dans un article publi\u00e9 dans Science Advances en novembre 2018.<\/p>\n<p>Il a \u00e9t\u00e9 identifi\u00e9 avec les donn\u00e9es collect\u00e9es entre 1997 et 2014 par KU du programme d&rsquo;\u00e9valuation du climat r\u00e9gional arctique et de l&rsquo;op\u00e9ration IceBridge de la NASA. Il a \u00e9t\u00e9 compl\u00e9t\u00e9 par des donn\u00e9es compl\u00e9mentaires en mai 2016 \u00e0 l&rsquo;aide d&rsquo;un sondeur de profondeur \u00e0 multicanaux d\u00e9velopp\u00e9 par KU.<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"18051\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/un-enorme-cratere-decouvert-au-groenland-datant-du-dryas\/impact-massif-meteorite-groenland-3\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland-2.jpg?fit=800%2C480&amp;ssl=1\" data-orig-size=\"800,480\" 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;&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;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"impact-massif-meteorite-groenland\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland-2.jpg?fit=300%2C180&amp;ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland-2.jpg?fit=800%2C480&amp;ssl=1\" class=\"alignnone size-full wp-image-18051\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland-2.jpg?resize=800%2C480&#038;ssl=1\" alt=\"\" width=\"800\" height=\"480\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland-2.jpg?w=800&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland-2.jpg?resize=300%2C180&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland-2.jpg?resize=768%2C461&amp;ssl=1 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>\u00ab\u00a0Nous avons collect\u00e9 de nombreuses donn\u00e9es de sondage radar au cours des deux derni\u00e8res d\u00e9cennies, et les glaciologues ont mis en place ces ensembles de sondage radar pour produire des cartes de ce que ressemble le dessous de la glace du Groenland\u00a0\u00bb, a d\u00e9clar\u00e9 le co-auteur John Paden, professeur associ\u00e9 g\u00e9nie \u00e9lectrique et informatique \u00e0 la KU et chercheur associ\u00e9 au CReSIS. \u00ab\u00a0Des chercheurs danois analysaient la carte et ont vu cette grande d\u00e9pression ressemblant \u00e0 un crat\u00e8re sous la plaque de glace et observ\u00e9 l&rsquo;imagerie satellite &#8211; le crat\u00e8re est sur le bord de la calotte glaciaire &#8211; vous pouvez \u00e9galement voir un motif circulaire. Les deux personnes r\u00e9unies ont clairement plaid\u00e9 en faveur de l&rsquo;existence d\u2019un site de crat\u00e8re d\u2019impact. Sur la base de cette d\u00e9couverte, une \u00e9tude radar d\u00e9taill\u00e9e a \u00e9t\u00e9 r\u00e9alis\u00e9e en mai 2016 \u00e0 l&rsquo;aide d&rsquo;un nouveau radar de pointe con\u00e7u et construit par KU pour l&rsquo;institut Alfred Wegener en Allemagne. \u00a0\u00bb<\/p>\n<p>Paden qui a particip\u00e9 au d\u00e9veloppement du logiciel de traitement du signal radar MCoRDS, et \u00e0 des vols \u00e0 basse altitude selon un sch\u00e9ma en grille au-dessus du crat\u00e8re d&rsquo;impact pour en d\u00e9tailler les dimensions :<\/p>\n<p>\u00ab\u00a0Vous pouvez voir la structure arrondie au bord du glacier, surtout lorsque vous volez d&rsquo;assez haut\u00a0\u00bb, a-t-il d\u00e9clar\u00e9. \u00ab\u00a0La plupart du temps, le crat\u00e8re n&rsquo;est pas visible par la fen\u00eatre de l&rsquo;avion. Il est amusant de constater que jusqu&rsquo;\u00e0 pr\u00e9sent personne n&rsquo;a pu imaginer qu&rsquo;il \u00e9tait l\u00e0 :\u00a0\u00bb H\u00e9, quelle est cette caract\u00e9ristique en demi-cercle ici ? \u00a0\u00bb Depuis l\u2019avion, il est difficile de voir ce qu&rsquo;il en est. Par contre, vous pouvez vraiment voir le cercle du crat\u00e8re dans ces images.\u00a0\u00bb<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"18050\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/un-enorme-cratere-decouvert-au-groenland-datant-du-dryas\/impact-massif-meteorite-groenland-2\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland-1.jpg?fit=799%2C480&amp;ssl=1\" data-orig-size=\"799,480\" 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;&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;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"impact-massif-meteorite-groenland\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland-1.jpg?fit=300%2C180&amp;ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland-1.jpg?fit=799%2C480&amp;ssl=1\" class=\"alignnone size-full wp-image-18050\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland-1.jpg?resize=799%2C480&#038;ssl=1\" alt=\"\" width=\"799\" height=\"480\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland-1.jpg?w=799&amp;ssl=1 799w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland-1.jpg?resize=300%2C180&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland-1.jpg?resize=768%2C461&amp;ssl=1 768w\" sizes=\"auto, (max-width: 799px) 100vw, 799px\" \/><\/p>\n<p>Pour confirmer les r\u00e9sultats obtenus par satellite et radar, l\u2019\u00e9quipe de recherche a ensuite effectu\u00e9 des \u00e9tudes au sol des s\u00e9diments fluvio-glaciaires de la plus grande rivi\u00e8re drainant le crat\u00e8re. Les travaux ont montr\u00e9 la pr\u00e9sence de \u00ab\u00a0quartz choqu\u00e9 et autres grains li\u00e9s aux chocs\u00a0\u00bb comprenant du verre. L&rsquo;\u00e9quipe de recherche estime que ces roches et ces grains de verre sont probablement produits par la fusion par impact des grains dans le substrat rocheux m\u00e9ta-s\u00e9dimentaire.<\/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><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\/vTr3VdGlFr8?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>Il reste du travail pour d\u00e9terminer avec plus de pr\u00e9cision la date exacte de l&rsquo;impact de l&rsquo;ast\u00e9ro\u00efde sur le Groenland. Les auteurs d\u00e9crivent des preuves \u00ab\u00a0qui sugg\u00e8rent que le crat\u00e8re d&rsquo;impact Hiawatha s&rsquo;est form\u00e9 pendant le Pl\u00e9istoc\u00e8ne, car cet \u00e2ge correspond le mieux aux donn\u00e9es actuellement disponibles\u00a0\u00bb. Cependant, m\u00eame dans ce large intervalle de temps, cela reste \u00ab\u00a0incertain\u00a0\u00bb. Au sud-ouest du crat\u00e8re, l&rsquo;\u00e9quipe a d\u00e9couvert une r\u00e9gion riche en d\u00e9bris \u00e9ventuels \u00e9ject\u00e9s de l&rsquo;impact, ce qui pourrait permettre de r\u00e9duire la plage de datation.<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"18052\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/un-enorme-cratere-decouvert-au-groenland-datant-du-dryas\/impact-massif-meteorite-groenland-4\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland-3.jpg?fit=800%2C480&amp;ssl=1\" data-orig-size=\"800,480\" 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;&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;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"impact-massif-meteorite-groenland\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland-3.jpg?fit=300%2C180&amp;ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland-3.jpg?fit=800%2C480&amp;ssl=1\" class=\"alignnone size-full wp-image-18052\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland-3.jpg?resize=800%2C480&#038;ssl=1\" alt=\"\" width=\"800\" height=\"480\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland-3.jpg?w=800&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland-3.jpg?resize=300%2C180&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland-3.jpg?resize=768%2C461&amp;ssl=1 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>\u00ab\u00a0Des d\u00e9bris projet\u00e9s dans l&rsquo;atmosph\u00e8re auraient eu une incidence sur le climat et la possibilit\u00e9 de faire fondre massivement la glace. Un afflux soudain d&rsquo;eau douce dans le d\u00e9troit de Nares entre le Canada et le Groenland aurait donc affect\u00e9 le d\u00e9bit oc\u00e9anique dans toute cette r\u00e9gion \u00ab\u00a0, a d\u00e9clar\u00e9 Paden. \u00ab\u00a0Les \u00e9l\u00e9ments de preuve indiquent que l&rsquo;impact est probablement survenu apr\u00e8s la formation de la calotte glaciaire du Groenland, mais l&rsquo;\u00e9quipe de recherche travaille toujours sur la datation exacte.\u00a0\u00bb<\/p>\n<p>Carte du Groenland montrant l&#8217;emplacement du crat\u00e8re d&rsquo;impact Hiawatha dans Inglefield Land, le long de la c\u00f4te nord-ouest de la calotte glaciaire du Groenland. Cr\u00e9dit: Mus\u00e9e d&rsquo;histoire naturelle du Danemark.<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"18049\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/un-enorme-cratere-decouvert-au-groenland-datant-du-dryas\/impact-massif-meteorite-groenland\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland.jpg?fit=800%2C480&amp;ssl=1\" data-orig-size=\"800,480\" 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;&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;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"impact-massif-meteorite-groenland\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland.jpg?fit=300%2C180&amp;ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland.jpg?fit=800%2C480&amp;ssl=1\" class=\"alignnone size-full wp-image-18049\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland.jpg?resize=800%2C480&#038;ssl=1\" alt=\"\" width=\"800\" height=\"480\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland.jpg?w=800&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland.jpg?resize=300%2C180&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/impact-massif-meteorite-groenland.jpg?resize=768%2C461&amp;ssl=1 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>&nbsp;<img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"18054\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/un-enorme-cratere-decouvert-au-groenland-datant-du-dryas\/cratere-groenland-2\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/cratere-groenland-1.jpg?fit=1248%2C702&amp;ssl=1\" data-orig-size=\"1248,702\" 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;&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;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"cratere-groenland\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/cratere-groenland-1.jpg?fit=300%2C169&amp;ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/cratere-groenland-1.jpg?fit=800%2C450&amp;ssl=1\" class=\"alignnone size-full wp-image-18054\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/cratere-groenland-1.jpg?resize=1248%2C702&#038;ssl=1\" alt=\"\" width=\"1248\" height=\"702\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/cratere-groenland-1.jpg?w=1248&amp;ssl=1 1248w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/cratere-groenland-1.jpg?resize=300%2C169&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/cratere-groenland-1.jpg?resize=768%2C432&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/cratere-groenland-1.jpg?resize=800%2C450&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/cratere-groenland-1.jpg?resize=580%2C326&amp;ssl=1 580w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/cratere-groenland-1.jpg?resize=174%2C98&amp;ssl=1 174w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<p>Ce crat\u00e8re de m\u00e9t\u00e9orite est certainement \u00e0 se rapprocher de l\u2019\u00e9v\u00e9nement c\u00e9leste <a href=\"https:\/\/www.laterredufutur.com\/accueil\/du-nouveau-sur-la-comete-clovis\/\">d\u00e9nomm\u00e9 la com\u00e8te Clovis<\/a>. Cette hypoth\u00e8se se voulait \u00eatre, notamment, une r\u00e9ponse plausible \u00e0 l&rsquo;apparition d&rsquo;une \u00e9nigmatique brusque et r\u00e9cente vague de froid sur Terre pendant une p\u00e9riode connue sous le nom de Dryas r\u00e9cent, il y a environ 12.900 ans. Une vague de froid qu&rsquo;accompagnait aussi une s\u00e9rie d&rsquo;extinction notable en Am\u00e9rique du Nord, en particulier celle des mammouths.<\/p>\n<p>Adaptation <a href=\"https:\/\/www.laterredufutur.com\/accueil\/\">La Terre du Futur<\/a><\/p>\n<p>sources : <a href=\"https:\/\/m.phys.org\/news\/2018-11-huge-crater-greenland-impact-northern.html?fbclid=IwAR0rGoZpEKKbq098aA94UaiUW_v22KO4R73lFj5ss99b-Fb3dmPVDyh4yG0\" target=\"_blank\" rel=\"noopener\">https:\/\/m.phys.org\/<\/a> \/ <a href=\"https:\/\/www.futura-sciences.com\/planete\/actualites\/geologie-cratere-impact-geant-decouvert-groenland-39734\/\" target=\"_blank\" rel=\"noopener\">https:\/\/www.futura-sciences.com\/<\/a> \/ <a href=\"http:\/\/advances.sciencemag.org\/content\/4\/11\/eaar8173\" target=\"_blank\" rel=\"noopener\">http:\/\/advances.sciencemag.org<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"18048\">(1013)<\/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 \u00e9tude sur les glaciers du Groenland a mis au jour des preuves sugg\u00e9rant qu&rsquo;un ast\u00e9ro\u00efde de fer d&rsquo;un kilom\u00e8tre&#8230;<\/p>\n","protected":false},"author":1,"featured_media":18053,"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 \u00e9norme crat\u00e8re d\u00e9couvert au Groenland datant du Dryas @laterredufutur.com","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":[31],"tags":[3177,3985,1800,1521,2479,159,967,684],"class_list":["post-18048","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","tag-12000-ans","tag-13000-ans","tag-clovis","tag-comete","tag-dryas","tag-groenland","tag-meteorite","tag-video","wpcat-31-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/cratere-groenland.jpg?fit=1400%2C672&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-4H6","jetpack-related-posts":[{"id":17172,"url":"https:\/\/www.laterredufutur.com\/accueil\/un-cratere-dimpact-geant-decouvert-au-groenland\/","url_meta":{"origin":18048,"position":0},"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":[]},{"id":23820,"url":"https:\/\/www.laterredufutur.com\/accueil\/un-enorme-cratere-sous-un-glacier-du-groenland-surprend-les-scientifiques-par-son-age-reel\/","url_meta":{"origin":18048,"position":1},"title":"Un \u00e9norme crat\u00e8re sous un glacier du Groenland surprend les scientifiques par son \u00e2ge r\u00e9el","author":"Admin","date":"11 mars 2022","format":false,"excerpt":"Un \u00e9norme crat\u00e8re d'impact, cach\u00e9 profond\u00e9ment sous le glacier Hiawatha du Groenland, est probablement le r\u00e9sultat d'un ast\u00e9ro\u00efde d'un kilom\u00e8tre de large qui s'est \u00e9cras\u00e9 sur la Terre il y a 58 millions d'ann\u00e9es. C'est beaucoup plus vieux que ce que les scientifiques pensaient, environ huit millions d'ann\u00e9es apr\u00e8s le\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\/2022\/03\/cratere-groenland.jpg?fit=1024%2C415&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/03\/cratere-groenland.jpg?fit=1024%2C415&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/03\/cratere-groenland.jpg?fit=1024%2C415&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/03\/cratere-groenland.jpg?fit=1024%2C415&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":18449,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-nasa-decouvre-un-deuxieme-cratere-geant-sous-la-glace-du-groenland\/","url_meta":{"origin":18048,"position":2},"title":"La Nasa d\u00e9couvre un deuxi\u00e8me crat\u00e8re g\u00e9ant sous la glace du Groenland","author":"Admin","date":"15 mars 2019","format":false,"excerpt":"Des scientifiques de la NASA ont d\u00e9cel\u00e9, sous l\u2019\u00e9paisse calotte de glace du Groenland, un myst\u00e9rieux crat\u00e8re large de pr\u00e8s de 40 kilom\u00e8tres. Une d\u00e9couverte qui suit de seulement quelques mois la mise au jour d\u2019un autre crat\u00e8re groenlandais. Des mondes perdus se tapissent d\u00e9cid\u00e9ment sous la glace. Apr\u00e8s la\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/02\/deuxieme-cratere-groenland-1.jpg?fit=1024%2C466&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/02\/deuxieme-cratere-groenland-1.jpg?fit=1024%2C466&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/02\/deuxieme-cratere-groenland-1.jpg?fit=1024%2C466&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/02\/deuxieme-cratere-groenland-1.jpg?fit=1024%2C466&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":18672,"url":"https:\/\/www.laterredufutur.com\/accueil\/il-y-a-pres-de-13-000-ans-un-impact-de-comete-a-cree-des-incendies-planetaires\/","url_meta":{"origin":18048,"position":3},"title":"Il y a pr\u00e8s de 13 000 ans, un impact de com\u00e8te a cr\u00e9\u00e9 des incendies plan\u00e9taires","author":"Admin","date":"24 mars 2019","format":false,"excerpt":"Il y a environ 12 800 ans, la plan\u00e8te Terre a travers\u00e9 une vague de froid qui n'a aucun lien avec l'origine des autres \u00e2ges glaciaires \"r\u00e9cents\". Pendant des ann\u00e9es, des g\u00e9ologues ont fait valoir que cette p\u00e9riode \u00e9tait caus\u00e9e par une explosion a\u00e9rienne d'une com\u00e8te ou de fragments 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":15101,"url":"https:\/\/www.laterredufutur.com\/accueil\/danciennes-sculptures-en-pierre-montrent-quun-essaim-de-cometes-a-percute-la-terre-il-y-a-13000-ans\/","url_meta":{"origin":18048,"position":4},"title":"D&rsquo;anciennes sculptures en pierre montrent qu&rsquo;un essaim de com\u00e8tes a percut\u00e9 la Terre il y a 13000 ans","author":"Admin","date":"24 avril 2017","format":false,"excerpt":"D'anciennes sculptures en pierre montrent qu'un essaim de com\u00e8tes a percut\u00e9 la terre vers 10,950 avant notre \u00e8re. Les chercheurs ont traduit d'anciens symboles dans un temple en Turquie, et ils racontent l'histoire d'un impact d\u00e9vastateur d'une com\u00e8te il y a plus de 13 000 ans. En v\u00e9rifiant l'\u00e9v\u00e9nement du\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\/2017\/04\/pierre-comete-turquie-clovis.jpg?fit=639%2C400&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/04\/pierre-comete-turquie-clovis.jpg?fit=639%2C400&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/04\/pierre-comete-turquie-clovis.jpg?fit=639%2C400&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":25297,"url":"https:\/\/www.laterredufutur.com\/accueil\/limpact-dune-comete-a-declenche-un-changement-massif-sur-terre-il-y-a-13-000-ans\/","url_meta":{"origin":18048,"position":5},"title":"L&rsquo;impact d&rsquo;une com\u00e8te a d\u00e9clench\u00e9 un changement massif sur Terre il y a 13 000 ans","author":"Admin","date":"21 octobre 2023","format":false,"excerpt":"Imaginez que vous soyez un chasseur-cueilleur il y a pr\u00e8s de 13 000 ans. Il cueillait des baies et chassait des animaux sauvages - quand soudain une gigantesque boule de feu apparu dans le ciel. Elle explosa dans un fracas assourdissant, envoyant des ondes de choc vers le sol et\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\/2023\/10\/comete-asteroide.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\/2023\/10\/comete-asteroide.jpg?fit=1200%2C675&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/comete-asteroide.jpg?fit=1200%2C675&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/comete-asteroide.jpg?fit=1200%2C675&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/comete-asteroide.jpg?fit=1200%2C675&ssl=1&resize=1050%2C600 3x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/18048","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=18048"}],"version-history":[{"count":4,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/18048\/revisions"}],"predecessor-version":[{"id":18058,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/18048\/revisions\/18058"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/18053"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=18048"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=18048"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=18048"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}