{"id":191099,"date":"2023-07-12T15:55:36","date_gmt":"2023-07-12T13:55:36","guid":{"rendered":"https:\/\/legrandcontinent.eu\/fr\/?p=191099"},"modified":"2023-07-12T15:55:38","modified_gmt":"2023-07-12T13:55:38","slug":"sommes-nous-entres-dans-lanthropocene","status":"publish","type":"post","link":"https:\/\/legrandcontinent.eu\/fr\/2023\/07\/12\/sommes-nous-entres-dans-lanthropocene\/","title":{"rendered":"Sommes-nous entr\u00e9s dans l\u2019Anthropoc\u00e8ne&#160;?"},"content":{"rendered":"\n<p>La Commission internationale de stratigraphie (ICS), qui d\u00e9pend de l&rsquo;Union internationale des sciences g\u00e9ologiques (UISG), est la principale institution proposant le d\u00e9coupage de l\u2019histoire de la Terre en \u00e9ons \u2014 principale subdivision chronostratigraphique de l&rsquo;\u00e9chelle des temps g\u00e9ologiques \u2014, \u00e8res, p\u00e9riodes, \u00e9poques et \u00e2ges&nbsp;<span class='whitespace-nowrap'><span id='easy-footnote-1-191099' class='easy-footnote-margin-adjust'><\/span><span class='easy-footnote note-digits-1'><a href='https:\/\/legrandcontinent.eu\/fr\/2023\/07\/12\/sommes-nous-entres-dans-lanthropocene\/#easy-footnote-bottom-1-191099' title='&lt;a href=&quot;https:\/\/stratigraphy.org\/ICSchart\/ChronostratChart2023-06.pdf&quot;&gt;International Chronostratigraphic Chart&lt;\/a&gt;, Commission internationale de stratigraphie, juin 2023.'><sup>1<\/sup><\/a><\/span><\/span>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Depuis la formation de la Terre il y a environ 4,5 milliards d\u2019ann\u00e9es, presque 40 \u00e9poques diff\u00e9rentes (dont la dur\u00e9e varie de plusieurs dizaines de milliers \u00e0 des dizaines de millions d\u2019ann\u00e9es) se seraient ainsi succ\u00e9d\u00e9.<\/li>\n\n\n\n<li>L\u2019entr\u00e9e de notre plan\u00e8te dans l\u2019\u00e9poque de l\u2019Holoc\u00e8ne, celle dans laquelle nous nous trouvons actuellement (d\u00e9but\u00e9e il y a 11 700 ans), a \u00e9t\u00e9 d\u00e9finie par la d\u00e9couverte de mol\u00e9cules d&rsquo;hydrog\u00e8ne pi\u00e9g\u00e9es dans des glaces du Groenland.<\/li>\n<\/ul>\n\n\n\n<div class=\"iframe-container wp-block-image wp-block-image-medium  iframe-dw\">\n\t<div>\n\t\t<iframe class=\"absolute w-full h-full pin-t pin-l\" title=\"titolo\" aria-label=\"Interactive line chart\" src=\"\/\/datawrapper.dwcdn.net\/e1VSt\/\" scrolling=\"no\" frameborder=\"0\"><\/iframe>\n\t<\/div>\n<\/div>\n\n\n\n<p>Lors d\u2019une conf\u00e9rence de presse qui s\u2019est tenue mardi 11 juillet, le Groupe de Travail sur l\u2019Anthropoc\u00e8ne a annonc\u00e9 avoir s\u00e9lectionn\u00e9 un site g\u00e9ologique canadien, le lac Crawford (situ\u00e9 dans la province canadienne de l\u2019Ontario), comme \u00ab&#160;clou d\u2019or&#160;\u00bb indiquant que la Terre serait entr\u00e9e dans l\u2019\u00e9poque de <a href=\"https:\/\/legrandcontinent.eu\/fr\/2023\/05\/21\/introduction-a-la-metaphysique-de-lanthropocene\/\">l\u2019Anthropoc\u00e8ne<\/a>&nbsp;<span class='whitespace-nowrap'><span id='easy-footnote-2-191099' class='easy-footnote-margin-adjust'><\/span><span class='easy-footnote note-digits-1'><a href='https:\/\/legrandcontinent.eu\/fr\/2023\/07\/12\/sommes-nous-entres-dans-lanthropocene\/#easy-footnote-bottom-2-191099' title='&lt;a href=&quot;https:\/\/www.anthropocene-curriculum.org\/project\/press-material-gssp-candidate-site-announcement&quot;&gt;Press Material GSSP Candidate Site Announcement&lt;\/a&gt;, Groupe de Travail sur l\u2019Anthropoc\u00e8ne, 11 juillet 2023.'><sup>2<\/sup><\/a><\/span><\/span>.<\/p>\n\n\n\n<div class=\"iframe-container wp-block-image wp-block-image-medium  iframe-dw\">\n\t<div>\n\t\t<iframe class=\"absolute w-full h-full pin-t pin-l\" title=\"titolo\" aria-label=\"Interactive line chart\" src=\"\/\/datawrapper.dwcdn.net\/i8St5\/\" scrolling=\"no\" frameborder=\"0\"><\/iframe>\n\t<\/div>\n<\/div>\n\n\n\n<p>Celui-ci fait partie des douze sites s\u00e9lectionn\u00e9s pour leur richesse s\u00e9dimentaire permettant d\u2019indiquer l\u2019entr\u00e9e dans une nouvelle \u00e8re g\u00e9ologique.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Le lac Crawford est dit \u00ab&#160;m\u00e9romictique&#160;\u00bb, ce qui signifie que la couche d\u2019eau inf\u00e9rieure (le monimolimnion) ne se m\u00e9lange pas avec les couches sup\u00e9rieures (mixolimnion), limitant les perturbations.<\/li>\n\n\n\n<li>L\u2019accumulation de s\u00e9diments (varve) dans le fond du lac enregistrent ainsi des \u00ab&#160;informations pr\u00e9cises sur l&rsquo;\u00e9poque \u00e0 laquelle elles se sont d\u00e9pos\u00e9es&#160;\u00bb et t\u00e9moignent des conditions environnementales pass\u00e9es&nbsp;<span class='whitespace-nowrap'><span id='easy-footnote-3-191099' class='easy-footnote-margin-adjust'><\/span><span class='easy-footnote note-digits-1'><a href='https:\/\/legrandcontinent.eu\/fr\/2023\/07\/12\/sommes-nous-entres-dans-lanthropocene\/#easy-footnote-bottom-3-191099' title='&lt;a href=&quot;https:\/\/www.anthropocene-curriculum.org\/the-geological-anthropocene\/site\/crawford-lake&quot;&gt;Crawford Lake, Canada&lt;\/a&gt;, Groupe de Travail sur l\u2019Anthropoc\u00e8ne, 11 mai 2022.'><sup>3<\/sup><\/a><\/span><\/span>.<\/li>\n\n\n\n<li>Lors de leurs recherches, les g\u00e9ologues du Groupe de Travail sur l\u2019Anthropoc\u00e8ne y ont relev\u00e9 la pr\u00e9sence de radionucl\u00e9ides provenant d\u2019essais d\u2019armes nucl\u00e9aires, des traces de pollution industrielle (microplastiques, nitrog\u00e8ne, mercure, cendres volantes\u2026) ainsi que des changements dans les types de pollens d&rsquo;arbres enfouis, t\u00e9moignant de la r\u00e9action de la for\u00eat bordant le lac \u00e0 l\u2019augmentation des temp\u00e9ratures.<\/li>\n<\/ul>\n\n\n\n<div class=\"iframe-container wp-block-image wp-block-image-medium  iframe-dw\">\n\t<div>\n\t\t<iframe class=\"absolute w-full h-full pin-t pin-l\" title=\"titolo\" aria-label=\"Interactive line chart\" src=\"\/\/datawrapper.dwcdn.net\/UIIR5\/\" scrolling=\"no\" frameborder=\"0\"><\/iframe>\n\t<\/div>\n<\/div>\n\n\n\n<p>Si la d\u00e9signation du lac Crawford comme lieu de r\u00e9f\u00e9rence indiquant l\u2019entr\u00e9e dans l\u2019Anthropoc\u00e8ne constitue un ach\u00e8vement pour le Groupe de Travail, la communaut\u00e9 scientifique est divis\u00e9e quant \u00e0 l\u2019ouverture d\u2019une nouvelle p\u00e9riode g\u00e9ologique avec si peu de recul&nbsp;<span class='whitespace-nowrap'><span id='easy-footnote-4-191099' class='easy-footnote-margin-adjust'><\/span><span class='easy-footnote note-digits-1'><a href='https:\/\/legrandcontinent.eu\/fr\/2023\/07\/12\/sommes-nous-entres-dans-lanthropocene\/#easy-footnote-bottom-4-191099' title='Sarah Kaplan, \u00ab&amp;#160;&lt;a href=&quot;https:\/\/www.washingtonpost.com\/climate-environment\/2023\/07\/11\/anthropocene-begins-canada-crawford-lake\/?utm_campaign=wp_todays_worldview&amp;amp;utm_medium=email&amp;amp;utm_source=newsletter&amp;amp;wpisrc=nl_todayworld&amp;amp;carta-url=https%3A%2F%2Fs2.washingtonpost.com%2Fcar-ln-tr%2F3a8bc57%2F64ae26df7880cf67428441cb%2F6100031eae7e8a0db1e98a56%2F23%2F65%2F64ae26df7880cf67428441cb&quot;&gt;Crawford Lake shows humans started a new chapter in geologic time, scientists say&lt;\/a&gt;&amp;#160;\u00bb, &lt;em&gt;The Washington Post&lt;\/em&gt;, 11 juillet 2023.'><sup>4<\/sup><\/a><\/span><\/span>. Avant que celle-ci soit reconnue, plusieurs votes devront approuver trois propositions&#160;: le lac Crawford indique l\u2019entr\u00e9e dans l\u2019Anthropoc\u00e8ne (dont l\u2019ann\u00e9e exacte reste \u00e0 d\u00e9terminer), celle-ci met donc fin \u00e0 l\u2019\u00e9poque de l\u2019Holoc\u00e8ne, et les autres sites non-s\u00e9lectionn\u00e9s pour \u00eatre les \u00ab&#160;clous d\u2019or&#160;\u00bb pourraient aider \u00e0 d\u00e9finir l&rsquo;Anthropoc\u00e8ne \u00e0 travers les environnements g\u00e9ologiques&nbsp;<span class='whitespace-nowrap'><span id='easy-footnote-5-191099' class='easy-footnote-margin-adjust'><\/span><span class='easy-footnote note-digits-1'><a href='https:\/\/legrandcontinent.eu\/fr\/2023\/07\/12\/sommes-nous-entres-dans-lanthropocene\/#easy-footnote-bottom-5-191099' title='Alexandre Witze, \u00ab&amp;#160;&lt;a href=&quot;https:\/\/www.nature.com\/articles\/d41586-023-02234-z&quot;&gt;This quiet lake could mark the start of a new Anthropocene epoch&lt;\/a&gt;&amp;#160;\u00bb, &lt;em&gt;Nature&lt;\/em&gt;, 11 juillet 2023.'><sup>5<\/sup><\/a><\/span><\/span>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>L\u2019analyse de s\u00e9diments stratifi\u00e9s dans un lac canadien indiquerait, selon les scientifiques du Groupe de Travail sur l\u2019Anthropoc\u00e8ne, que la Terre serait sortie de l\u2019\u00e9poque de l\u2019Holoc\u00e8ne au milieu du XXe si\u00e8cle pour entrer dans une nouvelle \u00e8re, marqu\u00e9e par l\u2019impact de l\u2019\u00eatre humain sur la plan\u00e8te.<\/p>\n","protected":false},"author":2622,"featured_media":191103,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"templates\/post-briefings.php","format":"standard","meta":{"_acf_changed":false,"_trash_the_other_posts":false,"_yoast_wpseo_estimated-reading-time-minutes":3,"_lgc_tts_voice":"","_lgc_tts_publish":false,"_lgc_tts_history_item_id":"","_lgc_tts_generated_at":"","_lgc_tts_status":"","_lgc_tts_error":"","footnotes":""},"categories":[2040],"tags":[],"staff":[],"editorial_format":[4942],"serie":[],"audience":[],"geo":[2163],"class_list":["post-191099","post","type-post","status-publish","format-standard","hentry","category-science","editorial_format-actu-breves","geo-monde"],"acf":{"open_in_webview":false,"accent":false,"_thumbnail_id":191103,"excerpt":"L\u2019analyse de s\u00e9diments stratifi\u00e9s dans un lac canadien indiquerait, selon les scientifiques du Groupe de Travail sur l\u2019Anthropoc\u00e8ne, que la Terre serait sortie de l\u2019\u00e9poque de l\u2019Holoc\u00e8ne au milieu du XXe si\u00e8cle pour entrer dans une nouvelle \u00e8re, marqu\u00e9e par l\u2019impact de l\u2019\u00eatre humain sur la plan\u00e8te.","display_date":"","new_abstract":true},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.1.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Sommes-nous entr\u00e9s dans l\u2019Anthropoc\u00e8ne ? 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