{"id":25332,"date":"2023-11-04T12:00:06","date_gmt":"2023-11-04T10:00:06","guid":{"rendered":"https:\/\/www.laterredufutur.com\/accueil\/?p=25332"},"modified":"2023-10-31T09:43:56","modified_gmt":"2023-10-31T07:43:56","slug":"une-ancienne-boite-noire-laisse-entrevoir-ce-qui-a-vraiment-tue-les-dinosaures","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/une-ancienne-boite-noire-laisse-entrevoir-ce-qui-a-vraiment-tue-les-dinosaures\/","title":{"rendered":"Une ancienne \u00ab\u00a0bo\u00eete noire\u00a0\u00bb laisse entrevoir ce qui a vraiment tu\u00e9 les dinosaures"},"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>Les fines poussi\u00e8res en suspension dans l&rsquo;atmosph\u00e8re ont peut-\u00eatre jou\u00e9 un r\u00f4le important dans l&rsquo;extinction des dinosaures.<\/p>\n<p>Il est g\u00e9n\u00e9ralement admis qu&rsquo;il y a environ 66 millions d&rsquo;ann\u00e9es, un rocher spatial plus grand que le mont Everest s&rsquo;est \u00e9cras\u00e9 sur ce qui est aujourd&rsquo;hui la c\u00f4te du Mexique, d\u00e9clenchant une cascade de catastrophes qui ont finalement tu\u00e9 les trois quarts de la vie sur Terre, dont les plus c\u00e9l\u00e8bres \u00e9taient les dinosaures non aviaires.<\/p>\n<p>Cependant, les d\u00e9tails les plus pr\u00e9cis de ce qui s&rsquo;est pass\u00e9 font encore l&rsquo;objet de d\u00e9bats.<\/p>\n<p>Aujourd&rsquo;hui, des scientifiques ont ouvert une \u00ab\u00a0bo\u00eete noire\u00a0\u00bb g\u00e9ologique qui sugg\u00e8re que l&rsquo;impact de l&rsquo;ast\u00e9ro\u00efde a cr\u00e9\u00e9 un panache de fines poussi\u00e8res qui a bloqu\u00e9 la lumi\u00e8re du soleil, refroidi la Terre, interrompu la photosynth\u00e8se et d\u00e9truit la cha\u00eene alimentaire.<\/p>\n<figure id=\"attachment_25334\" aria-describedby=\"caption-attachment-25334\" style=\"width: 547px\" class=\"wp-caption aligncenter\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"25334\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/une-ancienne-boite-noire-laisse-entrevoir-ce-qui-a-vraiment-tue-les-dinosaures\/carte-mexique\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/carte-mexique.jpg?fit=547%2C415&amp;ssl=1\" data-orig-size=\"547,415\" 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;1&quot;}\" data-image-title=\"carte mexique\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Emplacement du crat\u00e8re de Chicxulub o\u00f9 un ast\u00e9ro\u00efde a heurt\u00e9 la Terre. (Google Maps\/ScienceAlert)&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/carte-mexique.jpg?fit=547%2C415&amp;ssl=1\" class=\"size-full wp-image-25334\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/carte-mexique.jpg?resize=547%2C415&#038;ssl=1\" alt=\"\" width=\"547\" height=\"415\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/carte-mexique.jpg?w=547&amp;ssl=1 547w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/carte-mexique.jpg?resize=300%2C228&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/carte-mexique.jpg?resize=80%2C60&amp;ssl=1 80w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/carte-mexique.jpg?resize=174%2C131&amp;ssl=1 174w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/carte-mexique.jpg?resize=70%2C53&amp;ssl=1 70w\" sizes=\"auto, (max-width: 547px) 100vw, 547px\" \/><figcaption id=\"caption-attachment-25334\" class=\"wp-caption-text\">Emplacement du crat\u00e8re de Chicxulub o\u00f9 un ast\u00e9ro\u00efde a heurt\u00e9 la Terre. (Google Maps\/ScienceAlert)<\/figcaption><\/figure>\n<p>Propos\u00e9e en 1980 par les g\u00e9ologues qui ont d\u00e9couvert les premiers signes de l&rsquo;impact, cette hypoth\u00e8se a \u00e9t\u00e9 \u00e9cart\u00e9e au d\u00e9but des ann\u00e9es 2000, car les \u00e9chantillons de roches de cette \u00e9poque ne contenaient pas suffisamment de poussi\u00e8res fines pour provoquer un hiver plan\u00e9taire.<\/p>\n<p>Cependant, la plupart des \u00e9tudes pr\u00e9c\u00e9dentes \u00e9taient bas\u00e9es sur des couches de s\u00e9diments d&rsquo;un centim\u00e8tre d&rsquo;\u00e9paisseur datant de la p\u00e9riode Cr\u00e9tac\u00e9-Pal\u00e9og\u00e8ne. (Il n&rsquo;y a pas beaucoup de terre \u00e0 se mettre sous la dent).<\/p>\n<p>Cette nouvelle \u00e9tude a analys\u00e9 40 \u00e9chantillons de s\u00e9diments pr\u00e9lev\u00e9s dans un gisement beaucoup plus riche, d&rsquo;une profondeur de 1,3 m\u00e8tre, \u00e0 Tanis, dans le Dakota du Nord. Ce site se trouve \u00e0 3 000 kilom\u00e8tres au nord du crat\u00e8re de l&rsquo;ast\u00e9ro\u00efde Chicxulub, mais il offre un aper\u00e7u unique de la fa\u00e7on dont les panaches de poussi\u00e8re, de suie et de particules se sont r\u00e9pandus dans les ann\u00e9es qui ont suivi l&rsquo;impact.<\/p>\n<figure id=\"attachment_25336\" aria-describedby=\"caption-attachment-25336\" style=\"width: 1384px\" class=\"wp-caption alignnone\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"25336\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/une-ancienne-boite-noire-laisse-entrevoir-ce-qui-a-vraiment-tue-les-dinosaures\/diragramme-comete-dinosaure\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/diragramme-comete-dinosaure.webp?fit=1384%2C852&amp;ssl=1\" data-orig-size=\"1384,852\" 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=\"diragramme comete dinosaure\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/diragramme-comete-dinosaure.webp?fit=800%2C492&amp;ssl=1\" class=\"wp-image-25336 size-full\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/diragramme-comete-dinosaure.webp?resize=1384%2C852&#038;ssl=1\" alt=\"\" width=\"1384\" height=\"852\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/diragramme-comete-dinosaure.webp?w=1384&amp;ssl=1 1384w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/diragramme-comete-dinosaure.webp?resize=300%2C185&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/diragramme-comete-dinosaure.webp?resize=800%2C492&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/diragramme-comete-dinosaure.webp?resize=768%2C473&amp;ssl=1 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><figcaption id=\"caption-attachment-25336\" class=\"wp-caption-text\">Les d\u00e9p\u00f4ts g\u00e9ologiques de Tanis, dans le Dakota du Nord, datant de la p\u00e9riode Cr\u00e9tac\u00e9-Pal\u00e9og\u00e8ne, \u00e9taient riches en fines poussi\u00e8res de silicate (repr\u00e9sent\u00e9es par la ligne orange en gras) (Senel et al.\/Nature Geoscience\/2023).<\/figcaption><\/figure>\n<p>Les particules plus grosses diffusent la lumi\u00e8re \u00e0 des angles plus petits que les particules plus fines. \u00c0 l&rsquo;aide d&rsquo;un laser, les chercheurs ont donc pu d\u00e9terminer la proportion de poussi\u00e8re de silicate fine de 0,8 \u00e0 8 microm\u00e8tres dans chaque \u00e9chantillon.<\/p>\n<p>\u00ab\u00a0Nous avons constat\u00e9 que la contribution des poussi\u00e8res fines \u00e9tait plus importante que ce que l&rsquo;on pensait jusqu&rsquo;\u00e0 pr\u00e9sent\u00a0\u00bb, \u00e9crivent les chercheurs.<\/p>\n<p>\u00c0 l&rsquo;aide d&rsquo;une mod\u00e9lisation informatique, les chercheurs ont d\u00e9couvert que ces fines poussi\u00e8res &#8211; cr\u00e9\u00e9es lorsque l&rsquo;ast\u00e9ro\u00efde a heurt\u00e9 la Terre et pulv\u00e9ris\u00e9 la roche sous-jacente &#8211; \u00e9taient \u00ab\u00a0les plus mortelles\u00a0\u00bb des particules lib\u00e9r\u00e9es lorsque la m\u00e9t\u00e9orite de 10 \u00e0 15 kilom\u00e8tres de large est entr\u00e9e en collision avec la Terre.<\/p>\n<p>Ils ont constat\u00e9 que des niveaux \u00e9lev\u00e9s de poussi\u00e8re dans l&rsquo;atmosph\u00e8re auraient cr\u00e9\u00e9 une obscurit\u00e9 globale pendant pr\u00e8s de deux ans, ce qui aurait rendu impossible la photosynth\u00e8se des plantes.<\/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>Sans plantes, toute la cha\u00eene alimentaire se serait effondr\u00e9e. Les principaux pr\u00e9dateurs, comme le Tyrannosaurus rex, chassaient des proies dont l&rsquo;alimentation d\u00e9pendait des plantes.<\/p>\n<p>Ces poussi\u00e8res auraient pu rester en suspension dans l&rsquo;air pendant 15 ans, entra\u00eenant une baisse de 15 \u00b0C des temp\u00e9ratures mondiales et provoquant un \u00ab\u00a0arr\u00eat de la photosynth\u00e8se pendant pr\u00e8s de deux ans apr\u00e8s l&rsquo;impact\u00a0\u00bb en bloquant la lumi\u00e8re du soleil, \u00e9crivent les chercheurs.<\/p>\n<figure id=\"attachment_25337\" aria-describedby=\"caption-attachment-25337\" style=\"width: 904px\" class=\"wp-caption aligncenter\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"25337\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/une-ancienne-boite-noire-laisse-entrevoir-ce-qui-a-vraiment-tue-les-dinosaures\/impact-comete-dinosaure\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/impact-comete-dinosaure.webp?fit=904%2C794&amp;ssl=1\" data-orig-size=\"904,794\" 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 comete dinosaure\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;When the Chicxulub asteroid hit Earth, it created plumes of dust, sulfur, and sparked wildfires that generated soot. (Senel et al.\/Nature Geoscience\/2023)&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/impact-comete-dinosaure.webp?fit=800%2C703&amp;ssl=1\" class=\"size-full wp-image-25337\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/impact-comete-dinosaure.webp?resize=904%2C794&#038;ssl=1\" alt=\"\" width=\"904\" height=\"794\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/impact-comete-dinosaure.webp?w=904&amp;ssl=1 904w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/impact-comete-dinosaure.webp?resize=300%2C263&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/impact-comete-dinosaure.webp?resize=800%2C703&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/impact-comete-dinosaure.webp?resize=768%2C675&amp;ssl=1 768w\" sizes=\"auto, (max-width: 904px) 100vw, 904px\" \/><figcaption id=\"caption-attachment-25337\" class=\"wp-caption-text\">Lorsque l&rsquo;ast\u00e9ro\u00efde de Chicxulub a heurt\u00e9 la Terre, il a cr\u00e9\u00e9 des panaches de poussi\u00e8re et de soufre et d\u00e9clench\u00e9 des incendies de for\u00eat qui ont g\u00e9n\u00e9r\u00e9 de la suie (Senel et al.\/Nature Geoscience\/2023).<\/figcaption><\/figure>\n<p>Le choc de la collision aurait \u00e9galement vaporis\u00e9 des roches et produit des gaz sulfureux qui se transforment en petites particules dans l&rsquo;atmosph\u00e8re. La chaleur intense produite par l&rsquo;impact de l&rsquo;ast\u00e9ro\u00efde aurait d\u00e9clench\u00e9 des incendies de for\u00eat \u00e0 grande \u00e9chelle, envoyant de grandes quantit\u00e9s de suie et de cendres dans le ciel.<\/p>\n<p>Cependant, selon les r\u00e9sultats obtenus par les chercheurs, ce sont les silicates fins, et non les particules de soufre, qui sont principalement responsables de la prolongation de l&rsquo;hiver plan\u00e9taire.<\/p>\n<figure id=\"attachment_25338\" aria-describedby=\"caption-attachment-25338\" style=\"width: 518px\" class=\"wp-caption aligncenter\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"25338\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/une-ancienne-boite-noire-laisse-entrevoir-ce-qui-a-vraiment-tue-les-dinosaures\/chicxulub_impact\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/Chicxulub_impact.jpg?fit=518%2C415&amp;ssl=1\" data-orig-size=\"518,415\" 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=\"Chicxulub_impact\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;The Chicxulub crater is named after the town of Chicxulub Pueblo that sits at the center of its 150-kilometer boundaries. There are around 350 sites around the world where geologists can eyeball this tumultuous period by studying layers of sediment. (Donald E Davis\/NASA\/JPL-Caltech\/Wikimedia Commons)&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/Chicxulub_impact.jpg?fit=518%2C415&amp;ssl=1\" class=\"size-full wp-image-25338\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/Chicxulub_impact.jpg?resize=518%2C415&#038;ssl=1\" alt=\"\" width=\"518\" height=\"415\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/Chicxulub_impact.jpg?w=518&amp;ssl=1 518w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/Chicxulub_impact.jpg?resize=300%2C240&amp;ssl=1 300w\" sizes=\"auto, (max-width: 518px) 100vw, 518px\" \/><figcaption id=\"caption-attachment-25338\" class=\"wp-caption-text\">Le crat\u00e8re de Chicxulub doit son nom \u00e0 la ville de Chicxulub Pueblo qui se trouve au centre de son p\u00e9rim\u00e8tre de 150 kilom\u00e8tres. Il existe environ 350 sites dans le monde o\u00f9 les g\u00e9ologues peuvent observer cette p\u00e9riode tumultueuse en \u00e9tudiant les couches de s\u00e9diments. (Donald E Davis\/NASA\/JPL-Caltech\/Wikimedia Commons)<\/figcaption><\/figure>\n<p>\u00ab\u00a0Nous constatons que l&rsquo;obscurit\u00e9 globale et la perte prolong\u00e9e de l&rsquo;activit\u00e9 photosynth\u00e9tique de la plan\u00e8te ne se produisent que dans le sc\u00e9nario de la poussi\u00e8re de silicate, jusqu&rsquo;\u00e0 pr\u00e8s de 1,7 an (620 jours) apr\u00e8s l&rsquo;impact\u00a0\u00bb, \u00e9crivent les chercheurs.<\/p>\n<p>\u00ab\u00a0Il s&rsquo;agit d&rsquo;une \u00e9chelle de temps suffisamment longue pour poser de graves probl\u00e8mes aux habitats terrestres et marins.<\/p>\n<p>Les animaux et les plantes qui n&rsquo;\u00e9taient pas adapt\u00e9s ou qui ne pouvaient pas s&rsquo;adapter \u00e0 la vie dans l&rsquo;obscurit\u00e9 et le froid auraient p\u00e9ri. La flore et la faune ayant un r\u00e9gime alimentaire, un habitat et un mode de vie flexibles auraient eu plus de chances de survivre.<\/p>\n<p>L&rsquo;impact de l&rsquo;ast\u00e9ro\u00efde de Chicxulub a \u00e9galement d\u00e9clench\u00e9 un m\u00e9ga-tsunami de 1,5 kilom\u00e8tre de haut qui a frapp\u00e9 tous les continents de la Terre et d\u00e9clench\u00e9 une activit\u00e9 sismique 50 000 fois plus puissante que le tremblement de terre de Sumatra en 2004.<\/p>\n<p>Cet article a \u00e9t\u00e9 publi\u00e9 dans <a href=\"https:\/\/www.nature.com\/articles\/s41561-023-01290-4\" target=\"_blank\" rel=\"noopener\">Nature Geoscience.<\/a><\/p>\n<p>Adaptation <a href=\"https:\/\/www.laterredufutur.com\/accueil\/\" target=\"_blank\" rel=\"noopener\">Terra Projects<\/a><\/p>\n<p>Source : <a href=\"https:\/\/www.sciencealert.com\/ancient-black-box-hints-at-what-really-killed-the-dinosaurs\" target=\"_blank\" rel=\"noopener\">https:\/\/www.sciencealert.com\/<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"25332\">(262)<\/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>Les fines poussi\u00e8res en suspension dans l&rsquo;atmosph\u00e8re ont peut-\u00eatre jou\u00e9 un r\u00f4le important dans l&rsquo;extinction des dinosaures. Il est g\u00e9n\u00e9ralement&#8230;<\/p>\n","protected":false},"author":1,"featured_media":25333,"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":[33,19],"tags":[118,6902,8067,4371,703,8066,108],"class_list":["post-25332","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-archeologie","category-seismes-et-volcans","tag-asteroide","tag-chicxulub","tag-comte","tag-dinosaure","tag-impact","tag-siems","tag-tsunami","wpcat-33-id","wpcat-19-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/dinosaure_asteroide.jpg?fit=1024%2C415&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-6AA","jetpack-related-posts":[{"id":27298,"url":"https:\/\/www.laterredufutur.com\/accueil\/quest-il-arrive-a-lasteroide-qui-a-tue-les-dinosaures\/","url_meta":{"origin":25332,"position":0},"title":"Qu&rsquo;est-il arriv\u00e9 \u00e0 l&rsquo;ast\u00e9ro\u00efde qui a tu\u00e9 les dinosaures ?","author":"Admin","date":"3 octobre 2025","format":false,"excerpt":"Il y a environ 66 millions d'ann\u00e9es, un ast\u00e9ro\u00efde tueur s'est \u00e9cras\u00e9 sur la Terre \u00e0 43 000 km\/h. O\u00f9 se trouve-t-il aujourd'hui ? Il y a environ 66 millions d'ann\u00e9es, le r\u00e8gne des dinosaures prit fin brutalement. Un ast\u00e9ro\u00efde d'environ 12 kilom\u00e8tres de diam\u00e8tre , volant \u00e0 43 000\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\/2025\/09\/asteroide-tueur-Chicxulub.webp?fit=650%2C366&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/09\/asteroide-tueur-Chicxulub.webp?fit=650%2C366&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/09\/asteroide-tueur-Chicxulub.webp?fit=650%2C366&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":26204,"url":"https:\/\/www.laterredufutur.com\/accueil\/lasteroide-qui-a-tue-les-dinosaures-venait-dau-dela-de-jupiter\/","url_meta":{"origin":25332,"position":1},"title":"L&rsquo;ast\u00e9ro\u00efde qui a tu\u00e9 les dinosaures venait d&rsquo;au-del\u00e0 de Jupiter","author":"Admin","date":"4 septembre 2024","format":false,"excerpt":"Des indices chimiques laiss\u00e9s dans le crat\u00e8re d'impact peuvent aider \u00e0 retracer les origines de la m\u00e9t\u00e9orite. L'ast\u00e9ro\u00efde meurtrier le plus embl\u00e9matique de la Terre provient des confins du syst\u00e8me solaire, rapportent des chercheurs dans la revue Science du 16 ao\u00fbt. Il y a environ 66 millions d'ann\u00e9es, un ast\u00e9ro\u00efde\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\/2024\/08\/meteorite-de-Chicxulub-sur-le-Yucatan.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\/2024\/08\/meteorite-de-Chicxulub-sur-le-Yucatan.jpg?fit=1024%2C1024&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/08\/meteorite-de-Chicxulub-sur-le-Yucatan.jpg?fit=1024%2C1024&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/08\/meteorite-de-Chicxulub-sur-le-Yucatan.jpg?fit=1024%2C1024&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":24454,"url":"https:\/\/www.laterredufutur.com\/accueil\/lasteroide-tueur-de-dinosaures-a-provoque-des-tsunamis-mondiaux-dune-hauteur-de-3-5-km\/","url_meta":{"origin":25332,"position":2},"title":"L&rsquo;ast\u00e9ro\u00efde tueur de dinosaures a provoqu\u00e9 des tsunamis mondiaux d&rsquo;une hauteur de 3.5 km","author":"Admin","date":"5 octobre 2022","format":false,"excerpt":"Selon une nouvelle \u00e9tude, l'ast\u00e9ro\u00efde tueur de dinosaures qui a percut\u00e9 la Terre il y a 66 millions d'ann\u00e9es a \u00e9galement d\u00e9clench\u00e9 un tsunami de taille gigantesque, avec des vagues de plusieurs kilom\u00e8tres de haut dans le golfe du Mexique, dont les eaux ont parcouru la moiti\u00e9 du globe. Les\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\/2021\/04\/comete-asteroide.jpg?fit=1000%2C667&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/04\/comete-asteroide.jpg?fit=1000%2C667&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/04\/comete-asteroide.jpg?fit=1000%2C667&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/04\/comete-asteroide.jpg?fit=1000%2C667&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":22277,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-comete-qui-a-tue-les-dinosaures-a-donne-naissance-a-la-foret-amazonienne\/","url_meta":{"origin":25332,"position":3},"title":"La com\u00e8te qui a tu\u00e9 les dinosaures a donn\u00e9 naissance \u00e0 la for\u00eat amazonienne","author":"Admin","date":"6 avril 2021","format":false,"excerpt":"Les for\u00eats tropicales d'aujourd'hui ont vu le jour en raison de l'\u00e9norme impact de la com\u00e8te qui aurait an\u00e9anti les dinosaures. Avant que la com\u00e8te ne frappe la p\u00e9ninsule du Yucat\u00e1n, dans l'actuel Mexique, les for\u00eats tropicales d'Am\u00e9rique du Sud \u00e9taient constitu\u00e9es d'une v\u00e9g\u00e9tation tr\u00e8s diff\u00e9rente avec l'abondance de plantes\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\/2021\/04\/comete-asteroide.jpg?fit=1000%2C667&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/04\/comete-asteroide.jpg?fit=1000%2C667&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/04\/comete-asteroide.jpg?fit=1000%2C667&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/04\/comete-asteroide.jpg?fit=1000%2C667&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":17696,"url":"https:\/\/www.laterredufutur.com\/accueil\/lasteroide-tueur-des-dinosaures-aurait-declenche-un-tsunami-de-plus-de-1500-metres-de-haut\/","url_meta":{"origin":25332,"position":4},"title":"L&rsquo;ast\u00e9ro\u00efde tueur des dinosaures aurait d\u00e9clench\u00e9 un tsunami de plus de 1500 m\u00e8tres de haut","author":"Admin","date":"11 janvier 2019","format":false,"excerpt":"Lorsque l'ast\u00e9ro\u00efde destructeur des dinosaures est entr\u00e9 en collision avec la Terre il y a plus de 65 millions d'ann\u00e9es, son arriv\u00e9e ne s'est pas faite en douceur ! Une nouvelle \u00e9tude r\u00e9v\u00e8le que le tsunami qui a travers\u00e9 le golfe du Mexique a provoqu\u00e9 le chaos dans tous les\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\/01\/tsunami-dinosaure-2.jpg?fit=524%2C299&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":18812,"url":"https:\/\/www.laterredufutur.com\/accueil\/decouverte-de-fossiles-du-jour-ou-un-asteroide-a-frappe-la-terre-il-y-a-66-millions-dannees\/","url_meta":{"origin":25332,"position":5},"title":"D\u00e9couverte de fossiles du jour o\u00f9 un ast\u00e9ro\u00efde \u00e0 frapp\u00e9 la Terre, il y a 66 millions d&rsquo;ann\u00e9es","author":"Admin","date":"1 avril 2019","format":false,"excerpt":"Une \u00e9quipe de chercheurs a d\u00e9couvert aux Etats-Unis des fossiles extr\u00eamement bien conserv\u00e9s de poissons tu\u00e9s il y a 66 millions d'ann\u00e9es, au moment de l'impact d'un ast\u00e9ro\u00efde responsable de l'extinction de 75% de la vie sur Terre et peut-\u00eatre de celle des dinosaures. Ces fossiles de poissons et animaux\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\/04\/fossile-66millionsdannees.jpg?fit=640%2C320&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/04\/fossile-66millionsdannees.jpg?fit=640%2C320&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/04\/fossile-66millionsdannees.jpg?fit=640%2C320&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\/25332","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=25332"}],"version-history":[{"count":3,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/25332\/revisions"}],"predecessor-version":[{"id":25341,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/25332\/revisions\/25341"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/25333"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=25332"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=25332"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=25332"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}