{"id":661,"date":"2014-03-23T15:15:28","date_gmt":"2014-03-23T20:15:28","guid":{"rendered":"http:\/\/sciencemediacentre.ca\/site\/?p=661"},"modified":"2014-04-02T11:50:56","modified_gmt":"2014-04-02T16:50:56","slug":"de-loxygene-sur-terre-500-millions-dannees-plus-tot-que-prevu","status":"publish","type":"post","link":"http:\/\/sciencemediacentre.ca\/site\/de-loxygene-sur-terre-500-millions-dannees-plus-tot-que-prevu\/","title":{"rendered":"De l&#8217;oxyg\u00e8ne sur Terre 500 millions d&#8217;ann\u00e9es plus t\u00f4t que pr\u00e9vu<img src=\"http:\/\/sciencemediacentre.ca\/site\/wp-content\/uploads\/2014\/01\/canada_flag_icon_small.gif\">"},"content":{"rendered":"<div id=\"attachment_663\" style=\"width: 510px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/sciencemediacentre.ca\/site\/wp-content\/uploads\/2014\/03\/5479190071_40c1b0d62e.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-663\" class=\"size-full wp-image-663\" alt=\"Une photo en gros plan de bulles d'oxyg\u00e8ne. (Cr\u00e9dit photo: Mycatkins, flickr.com)\" src=\"http:\/\/sciencemediacentre.ca\/site\/wp-content\/uploads\/2014\/03\/5479190071_40c1b0d62e.jpg\" width=\"500\" height=\"333\" srcset=\"http:\/\/sciencemediacentre.ca\/site\/wp-content\/uploads\/2014\/03\/5479190071_40c1b0d62e.jpg 500w, http:\/\/sciencemediacentre.ca\/site\/wp-content\/uploads\/2014\/03\/5479190071_40c1b0d62e-300x199.jpg 300w, http:\/\/sciencemediacentre.ca\/site\/wp-content\/uploads\/2014\/03\/5479190071_40c1b0d62e-450x300.jpg 450w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><p id=\"caption-attachment-663\" class=\"wp-caption-text\">Une photo en gros plan de bulles d&#8217;oxyg\u00e8ne. (Cr\u00e9dit photo: Mycatkins, flickr.com)<\/p><\/div>\n<p>Dans les d\u00e9buts de l\u2019histoire de la Terre, l\u2019atmosph\u00e8re ne contenait pas d\u2019\u2019oxyg\u00e8ne jusqu\u2019\u00e0 la Grande Oxydation survenue il y a entre 2,3 et 2,5 milliards d\u2019ann\u00e9es. Des chercheurs ont toutefois trouv\u00e9 des marqueurs sur des roches d\u2019Afrique du Sud montrant qu\u2019il y avait de l\u2019oxyg\u00e8ne en concentration suffisante il y a 2,95 milliards d\u2019ann\u00e9es. Cette avanc\u00e9e montre que les organismes faisant de la photosynth\u00e8se produisaient assez d\u2019oxyg\u00e8ne pour qu\u2019elle commence \u00e0 s\u2019accumuler dans les bassins marins peu profonds 500 millions d\u2019ann\u00e9es avant la Grande Oxydation.<\/p>\n<p><!--more--><\/p>\n<p>Pour lire l\u2019article original publi\u00e9 dans\u00a0<em>Nature Geoscience<\/em>\u00a0le\u00a0<strong>23 mars 2014<\/strong>,<a href=\"http:\/\/www.nature.com\/ngeo\/journal\/v7\/n4\/full\/ngeo2122.html\" target=\"_blank\">\u00a0<\/a><span style=\"text-decoration: underline;\"><a href=\"http:\/\/www.nature.com\/ngeo\/journal\/v7\/n4\/full\/ngeo2122.html\" target=\"_blank\">cliquez ici<\/a><\/span>.<\/p>\n<p><span style=\"text-decoration: underline;\"><strong>Auteur \u00e0 contacter pour plus d\u2019informations<\/strong><\/span><\/p>\n<h4><a href=\"http:\/\/easweb.eas.ualberta.ca\/page\/directory\/?person=pecoe\" target=\"_blank\">Ernesto Pecoits<\/a>, d\u00e9partement des sciences de la terre et de l&#8217;atmosph\u00e8re, Universit\u00e9 de l\u2019Alberta<\/h4>\n<h4><a href=\"http:\/\/faculty.eas.ualberta.ca\/konhauser\/\" target=\"_blank\">Kurt O. Konhauser<\/a>, d\u00e9partement des sciences de la terre et de l&#8217;atmosph\u00e8re, Universit\u00e9 de l\u2019Alberta<\/h4>\n","protected":false},"excerpt":{"rendered":"<p>Dans les d\u00e9buts de l\u2019histoire de la Terre, l\u2019atmosph\u00e8re ne contenait pas d\u2019\u2019oxyg\u00e8ne jusqu\u2019\u00e0 la Grande Oxydation survenue il y a entre 2,3 et 2,5 milliards d\u2019ann\u00e9es. Des chercheurs ont toutefois trouv\u00e9 des marqueurs sur des roches d\u2019Afrique du Sud montrant qu\u2019il y avait de l\u2019oxyg\u00e8ne en concentration suffisante il y a 2,95 milliards d\u2019ann\u00e9es. [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":663,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_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":""},"categories":[531],"tags":[861],"class_list":["post-661","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-paper-of-interest-fr","tag-alberta-fr"],"jetpack_featured_media_url":"http:\/\/sciencemediacentre.ca\/site\/wp-content\/uploads\/2014\/03\/5479190071_40c1b0d62e.jpg","jetpack_shortlink":"https:\/\/wp.me\/p4DqbN-aF","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"http:\/\/sciencemediacentre.ca\/site\/wp-json\/wp\/v2\/posts\/661","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/sciencemediacentre.ca\/site\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/sciencemediacentre.ca\/site\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/sciencemediacentre.ca\/site\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"http:\/\/sciencemediacentre.ca\/site\/wp-json\/wp\/v2\/comments?post=661"}],"version-history":[{"count":3,"href":"http:\/\/sciencemediacentre.ca\/site\/wp-json\/wp\/v2\/posts\/661\/revisions"}],"predecessor-version":[{"id":681,"href":"http:\/\/sciencemediacentre.ca\/site\/wp-json\/wp\/v2\/posts\/661\/revisions\/681"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/sciencemediacentre.ca\/site\/wp-json\/wp\/v2\/media\/663"}],"wp:attachment":[{"href":"http:\/\/sciencemediacentre.ca\/site\/wp-json\/wp\/v2\/media?parent=661"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/sciencemediacentre.ca\/site\/wp-json\/wp\/v2\/categories?post=661"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/sciencemediacentre.ca\/site\/wp-json\/wp\/v2\/tags?post=661"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}