{"id":193374,"date":"2020-03-05T17:50:03","date_gmt":"2020-03-05T17:50:03","guid":{"rendered":"https:\/\/afrikmag.com\/var\/www\/vhosts\/afrikmag.compublic_html\/?p=193374"},"modified":"2020-03-05T17:50:06","modified_gmt":"2020-03-05T17:50:06","slug":"video-des-scientifiques-revelent-a-quoi-ressemblait-la-terre-il-y-a-32-milliards-dannees","status":"publish","type":"post","link":"https:\/\/afrikmag.com\/var\/www\/vhosts\/afrikmag.compublic_html\/video-des-scientifiques-revelent-a-quoi-ressemblait-la-terre-il-y-a-32-milliards-dannees\/","title":{"rendered":"Vid\u00e9o: Des scientifiques r\u00e9v\u00e8lent \u00e0 quoi ressemblait la Terre il y a 3,2 milliards d&rsquo;ann\u00e9es"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">La Terre \u00e9tait autrefois un \u00abmonde aquatique\u00bb tout comme celui d\u00e9crit par Hollywood dans le blockbuster de Kevin Costner, selon de nouvelles recherches.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un oc\u00e9an mondial a recouvert la plan\u00e8te il y a 3,2 milliards d&rsquo;ann\u00e9es, lorsque les premiers microbes primitifs ont \u00e9merg\u00e9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Il n&rsquo;y aurait pratiquement pas eu de terre s\u00e8che &#8211; \u00e0 l&rsquo;image de Waterworld, le film de science-fiction post-apocalyptique de 1995.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Des scientifiques am\u00e9ricains ont \u00e9tudi\u00e9 l&rsquo;outback rocheux australien \u00e0 la recherche de traces d&rsquo;oxyg\u00e8ne pour former une image de l&rsquo;eau de l&rsquo;oc\u00e9an d&rsquo;il y a des milliards d&rsquo;ann\u00e9es.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cette d\u00e9couverte pourrait \u00e9clairer l&rsquo;\u00e9volution de la vie sur Terre et expliquer comment les organismes unicellulaires sont apparus pour la premi\u00e8re fois.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L&rsquo;\u00e9quipe de recherche a d\u00e9clar\u00e9:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00abLa Terre primitive, qui abrite certaines des premi\u00e8res formes de vie de notre plan\u00e8te, pourrait avoir \u00e9t\u00e9 un\u00ab monde aquatique \u00bbr\u00e9el &#8211; sans continent en vue.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00ab\u00a0Cela pourrait m\u00eame ressembler un peu \u00e0 l&rsquo;avenir post-apocalyptique et sans terre imagin\u00e9 dans le film tristement c\u00e9l\u00e8bre de Costner, Waterworld.\u00a0\u00bb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dans le film, l&rsquo;humanit\u00e9 lutte pour survivre apr\u00e8s que les calottes glaciaires ont fondu et inond\u00e9 la plan\u00e8te d&rsquo;eau.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mais, contrairement au film, il n&rsquo;y avait pas de poisson &#8211; seulement de minuscules organismes aquatiques appel\u00e9s cyanobact\u00e9ries.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La d\u00e9couverte, rapport\u00e9e dans la revue Nature Geoscience, est bas\u00e9e sur une analyse des roches de l\u2019outback du nord-ouest de l\u2019Australie.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ils remontent \u00e0 une p\u00e9riode connue g\u00e9ologiquement sous le nom de \u00abPal\u00e9oarch\u00e9en\u00bb &#8211; s&rsquo;\u00e9talant sur une p\u00e9riode de 3 600 millions \u00e0 3 200 millions d&rsquo;ann\u00e9es &#8211; o\u00f9 la vie n&rsquo;\u00e9tait compos\u00e9e que de bact\u00e9ries plus complexes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00ab\u00a0L&rsquo;histoire de la vie sur Terre suit les niches disponibles\u00a0\u00bb, a d\u00e9clar\u00e9 le co-auteur, le professeur Boswell Wing, de l&rsquo;Universit\u00e9 du Colorado \u00e0 Boulder.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00ab\u00a0Si vous avez un monde aquatique, un monde couvert par l&rsquo;oc\u00e9an, alors les niches s\u00e8ches ne seront tout simplement pas disponibles.\u00a0\u00bb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Il a \u00e9t\u00e9 identifi\u00e9 \u00e0 partir des signatures chimiques d&rsquo;un oc\u00e9an dans un morceau de cro\u00fbte qui a \u00e9t\u00e9 retourn\u00e9 sur le c\u00f4t\u00e9 dans le d\u00e9sert de Panorama dans l&rsquo;outback australien.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Il est possible de traverser ce qui \u00e9tait autrefois l&rsquo;enveloppe ext\u00e9rieure dure de la plan\u00e8te en l&rsquo;espace d&rsquo;une journ\u00e9e.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Il vous emm\u00e8nera de la base \u00e0 des endroits o\u00f9 l&rsquo;eau bouillonnait autrefois \u00e0 travers le fond marin via des \u00e9vents hydrothermaux.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les chercheurs l&rsquo;ont d\u00e9crit comme une \u00abopportunit\u00e9 unique dans la vie\u00bb de recueillir des indices sur l&rsquo;eau de l&rsquo;oc\u00e9an il y a des milliards d&rsquo;ann\u00e9es.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00abAujourd&rsquo;hui, il y a ces collines vraiment broussailleuses et vallonn\u00e9es qui sont travers\u00e9es par des lits de rivi\u00e8re ass\u00e9ch\u00e9s\u00bb, a d\u00e9clar\u00e9 l&rsquo;auteur principal, le Dr Benjamin Johnson, actuellement \u00e0 l&rsquo;Iowa State University.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00abC\u2019est un endroit fou. Il n&rsquo;y a pas d&rsquo;\u00e9chantillons d&rsquo;eau de mer vraiment ancienne qui tra\u00eenent, mais nous avons des roches qui ont interagi avec cette eau de mer et se sont souvenues de cette interaction.\u00a0\u00bb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les chercheurs ont analys\u00e9 les donn\u00e9es de plus de 100 \u00e9chantillons de roche provenant du terrain sec.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ils recherchaient, en particulier, deux saveurs diff\u00e9rentes, ou \u00abisotopes\u00bb, de l&rsquo;oxyg\u00e8ne emprisonn\u00e9 dans la pierre &#8211; l&rsquo;oxyg\u00e8ne-18 et l&rsquo;oxyg\u00e8ne l\u00e9g\u00e8rement moins lourd-16.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le ratio \u00e9tait peut-\u00eatre un peu moins \u00e9lev\u00e9 dans l&rsquo;eau de mer il y a 3,2 milliards d&rsquo;ann\u00e9es &#8211; avec juste un tout petit peu plus d&rsquo;oxyg\u00e8ne-18 que vous n&rsquo;en voyez aujourd&rsquo;hui.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le professeur Wing a d\u00e9clar\u00e9 que ceux-ci sont \u00absuper sensibles\u00bb \u00e0 la pr\u00e9sence des continents.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les masses terrestres d&rsquo;aujourd&rsquo;hui sont couvertes de sols riches en argile qui absorbent de mani\u00e8re disproportionn\u00e9e les isotopes d&rsquo;oxyg\u00e8ne plus lourds de l&rsquo;eau &#8211; comme les aspirateurs min\u00e9raux pour Oxygen-18, a-t-il expliqu\u00e9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Il n\u2019y avait tout simplement pas de continents riches en sol autour pour aspirer les isotopes, mais il aurait pu y avoir de minuscules taches de terre parsem\u00e9es.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00ab\u00a0Il n&rsquo;y a rien dans ce que nous avons fait qui dit que vous ne pouvez pas avoir de minuscules micro-continents sortant des oc\u00e9ans\u00a0\u00bb, a d\u00e9clar\u00e9 le professeur Wing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00ab\u00a0Nous ne pensons tout simplement pas qu&rsquo;il y ait eu une formation de sols continentaux \u00e0 l&rsquo;\u00e9chelle mondiale comme nous l&rsquo;avons fait aujourd&rsquo;hui.\u00a0\u00bb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les chercheurs envisagent maintenant de parcourir d&rsquo;autres formations rocheuses plus jeunes sur des sites allant de l&rsquo;Arizona \u00e0 l&rsquo;Afrique du Sud pour voir s&rsquo;ils peuvent trouver le moment o\u00f9 les masses terrestres que nous connaissons aujourd&rsquo;hui ont fait leur apparition.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00ab\u00a0Essayer de combler cette lacune est vraiment important\u00a0\u00bb, a d\u00e9clar\u00e9 le Dr Johnson.<\/p>\n\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Ancient Earth: Pummeled, Cracked and Oozing Magma | Scientific Visualization\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/9agxiIVJPrU?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>La Terre \u00e9tait autrefois un \u00abmonde aquatique\u00bb tout comme celui d\u00e9crit par Hollywood dans le blockbuster de Kevin Costner, selon de nouvelles recherches. Un oc\u00e9an mondial a recouvert la plan\u00e8te il y a 3,2 milliards d&rsquo;ann\u00e9es, lorsque les premiers microbes primitifs ont \u00e9merg\u00e9. Il n&rsquo;y aurait pratiquement pas eu de terre s\u00e8che &#8211; \u00e0 l&rsquo;image &hellip;<\/p>\n","protected":false},"author":37,"featured_media":193376,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7220],"tags":[121847,14050,1987],"class_list":["post-193374","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science","tag-la-terre","tag-ocean","tag-scientifiques"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Vid\u00e9o: Des scientifiques r\u00e9v\u00e8lent \u00e0 quoi ressemblait la Terre il y a 3,2 milliards d&#039;ann\u00e9es<\/title>\n<meta name=\"description\" content=\"La Terre \u00e9tait autrefois un \u00abmonde aquatique\u00bb tout comme celui d\u00e9crit par Hollywood dans le blockbuster de Kevin Costner, selon de nouvelles recherches.\" 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