{"id":88410,"date":"2024-10-04T16:36:45","date_gmt":"2024-10-04T16:36:45","guid":{"rendered":"https:\/\/www.africa-press.net\/cotedivoire\/politique\/un-cratere-geant-pourrait-jeter-un-eclairage-nouveau-sur-levolution-de-la-vie-sur-terre"},"modified":"2024-10-04T18:09:21","modified_gmt":"2024-10-04T18:09:21","slug":"un-cratere-geant-pourrait-jeter-un-eclairage-nouveau-sur-levolution-de-la-vie-sur-terre","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/un-cratere-geant-pourrait-jeter-un-eclairage-nouveau-sur-levolution-de-la-vie-sur-terre","title":{"rendered":"Un crat\u00e8re g\u00e9ant pourrait jeter un \u00e9clairage nouveau sur l&rsquo;\u00e9volution de la vie sur Terre"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. <\/strong><\/span>Avec ses 300 kilome\u0300tres de diame\u0300tre, le crate\u0300re de Vredefort, en Afrique du Sud, est a\u0300 ce jour conside\u0301re\u0301 comme le plus grand crate\u0300re d&rsquo;impact confirme\u0301 au monde. Mais il pourrait e\u0302tre largement de\u0301tro\u0302ne\u0301 par une structure d\u2019impact de 520 kilome\u0300tres de diame\u0300tre, identifie\u0301e dans le de\u0301sert australien.<\/p>\n<p><b>De nouvelles preuves<\/b><\/p>\n<p>Les ge\u0301ologues ame\u0301ricains Daniel Connelly et Arif Sikder, de l&rsquo;Universite\u0301 du Commonwealth de Virginie, ont pre\u0301sente\u0301 fin septembre 2024 de nouvelles preuves de son existence lors de la re\u0301union annuelle de la Geological Society of America, a\u0300 Anaheim, en Californie.<\/p>\n<p>Le centre de cette structure d\u2019impact massif, baptise\u0301e Mapcis (pour \u00ab\u00a0Massive Australian Precambrian-Cambrian Impact Structure\u00a0\u00bb), se situe dans le Territoire du Nord, la re\u0301gion australienne ou\u0300 s\u2019e\u0301le\u0300ve la ville de Darwin. Un anneau plus large, de 2000 kilome\u0300tres de diame\u0300tre, pourrait e\u0302tre lie\u0301 a\u0300 cet anneau inte\u0301rieur.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"302\" class=\"alignnone wp-image-88407 size-full\" src=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2024\/10\/sm_1728051780.919604.jpg\" srcset=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2024\/10\/sm_1728051780.919604.jpg 453w, https:\/\/static.africa-press.net\/cote\/sites\/43\/2024\/10\/sm_1728051780.919604-300x200.jpg 300w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><br \/>\n<b>Des conditions extre\u0302mes au centre du crate\u0300re<\/b><\/p>\n<p>Les indices ge\u0301ologiques enregistre\u0301s par les deux chercheurs comprennent des de\u0301po\u0302ts massifs pre\u0300s du centre du crate\u0300re de pseudotachylite, des roches plus ou moins vitreuses forme\u0301es de roches broye\u0301es et partiellement fondues par l\u2019e\u0301le\u0301vation de tempe\u0301rature et les ondes de choc ge\u0301ne\u0301re\u0301s par un impact. D\u2019autres mine\u0301raux choque\u0301s te\u0301moignent de conditions extre\u0302mes de pression et de tempe\u0301rature qui ont jadis re\u0301gne\u0301 au centre de Mapcis.<\/p>\n<p>Notamment la lonsdale\u0301ite qui est l&rsquo;une des trois formes cristallise\u0301es naturelles du carbone, avec le graphite et le diamant. Sa forme hexagonale lui vaut ainsi d\u2019e\u0302tre connue sous le nom de diamant hexagonal. Enfin, les chercheurs ont observe\u0301, dans les se\u0301diments entourant Mapcis, des couches abondantes d&rsquo;iridium, un e\u0301le\u0301ment me\u0301tallique rare sur Terre, mais plus courant dans les aste\u0301roi\u0308des.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"339\" class=\"alignnone wp-image-88408 size-full\" src=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2024\/10\/sm_1728051784.238307.jpg\" srcset=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2024\/10\/sm_1728051784.238307.jpg 453w, https:\/\/static.africa-press.net\/cote\/sites\/43\/2024\/10\/sm_1728051784.238307-300x225.jpg 300w, https:\/\/static.africa-press.net\/cote\/sites\/43\/2024\/10\/sm_1728051784.238307-80x60.jpg 80w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><br \/>\n<b>Un impact qui remonte a\u0300 545 millions d&rsquo;anne\u0301es<\/b><\/p>\n<p>L\u2019analyse des couches de se\u0301diments et de roches magmatiques qui ont recouvert la structure au fil des sie\u0300cles permet de faire remonter l&rsquo;impact a\u0300 la fin de la pe\u0301riode e\u0301diacarienne, il y a environ 545 millions d&rsquo;anne\u0301es. Or cette pe\u0301riode a connu une grande extinction, qui a entrai\u0302ne\u0301 la disparition des premie\u0300res formes de vie complexes de la Terre, des organismes mous tels des tubes, des me\u0301duses ou des coraux mous vivant sur les fonds marins peu profonds.<\/p>\n<p>Jusqu\u2019a\u0300 pre\u0301sent, cet e\u0301ve\u0301nement e\u0301tait attribue\u0301 a\u0300 des changements environnementaux, l\u2019apparition de nouveaux pre\u0301dateurs ou des perturbations tectoniques ou climatiques. Un impact ge\u0301ant capable de cre\u0301er une telle structure pourrait e\u0301clairer d\u2019un jour nouveau cette pe\u0301riode de transition entre l\u2019Ediacarien et le Cambrien.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la C\u00f4te d&rsquo;Ivoire, suivez Africa-Press<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. Avec ses 300 kilome\u0300tres de diame\u0300tre, le crate\u0300re de Vredefort, en Afrique du Sud, est a\u0300 ce jour conside\u0301re\u0301 comme le plus grand crate\u0300re d&rsquo;impact confirme\u0301 au monde. Mais il pourrait e\u0302tre largement de\u0301tro\u0302ne\u0301 par une structure d\u2019impact de 520 kilome\u0300tres de diame\u0300tre, identifie\u0301e dans le de\u0301sert australien. De nouvelles preuves [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":88409,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[29],"class_list":["post-88410","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-cote-divoire"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Un crat\u00e8re g\u00e9ant pourrait jeter un \u00e9clairage nouveau sur l&#039;\u00e9volution de la vie sur Terre - C\u00f4te d&#039;Ivoire<\/title>\n<meta name=\"description\" content=\"Avec ses 300 kilome\u0300tres de diame\u0300tre, le crate\u0300re de Vredefort, en Afrique du Sud, est a\u0300 ce jour conside\u0301re\u0301 comme le ...\" \/>\n<meta name=\"robots\" content=\"index, follow, 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