{"id":4395,"date":"2026-02-09T22:54:17","date_gmt":"2026-02-09T22:54:17","guid":{"rendered":"https:\/\/www.africa-press.net\/fr\/home\/decouverte-de-structures-ondulees-anciennes-au-maroc"},"modified":"2026-02-10T02:13:00","modified_gmt":"2026-02-10T02:13:00","slug":"decouverte-de-structures-ondulees-anciennes-au-maroc","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/fr\/divers\/decouverte-de-structures-ondulees-anciennes-au-maroc","title":{"rendered":"D\u00e9couverte de Structures Ondul\u00e9es Anciennes au Maroc"},"content":{"rendered":"<p><span class=\"ap-article-header-tag\"> <strong>Africa-Press. <\/strong> <\/span>Des scientifiques ont d\u00e9couvert d\u2019anciens motifs de \u00ab structures ondul\u00e9es \u00bb pr\u00e9serv\u00e9s dans des roches jurassiques au Maroc, r\u00e9v\u00e9lant qu\u2019ils se sont form\u00e9s dans des eaux profondes, hors de port\u00e9e de la lumi\u00e8re solaire. Ces r\u00e9sultats montrent que ces structures ne proviennent pas de microbes photosynth\u00e9tiques, mais d\u2019organismes microscopiques tirant leur \u00e9nergie de r\u00e9actions chimiques, ce qui modifie l\u2019interpr\u00e9tation des traces de vie ancienne dans les archives g\u00e9ologiques.<\/p>\n<p>Cette d\u00e9couverte g\u00e9ologique, r\u00e9alis\u00e9e dans le Haut Atlas central, a permis aux chercheurs d\u2019identifier des ondulations inhabituelles conserv\u00e9es dans des roches datant du Jurassique inf\u00e9rieur, selon une \u00e9tude r\u00e9cente publi\u00e9e dans la revue scientifique Geology.<\/p>\n<p>Les structures ont \u00e9t\u00e9 mises au jour dans la formation de Tagoudite, pr\u00e8s du village de Boumdour. Les roches pr\u00e9sentent de petites cr\u00eates et sillons, mesurant de quelques millim\u00e8tres \u00e0 quelques centim\u00e8tres. Leur particularit\u00e9 r\u00e9side dans le fait qu\u2019elles se sont form\u00e9es \u00e0 une profondeur d\u2019environ 200 m\u00e8tres, dans un environnement d\u00e9pourvu de lumi\u00e8re.<\/p>\n<p>En raison de cette profondeur, les chercheurs concluent que ces structures ne peuvent pas \u00eatre attribu\u00e9es \u00e0 des communaut\u00e9s microbiennes photosynth\u00e9tiques, mais \u00e0 des microbes chimioautotrophes, qui exploitent l\u2019\u00e9nergie chimique plut\u00f4t que la lumi\u00e8re solaire. L\u2019\u00e9tude pr\u00e9cise qu\u2019\u00ab en raison de leur profondeur ancienne (~200 m), il est peu probable qu\u2019elles aient \u00e9t\u00e9 form\u00e9es par des communaut\u00e9s phototrophes \u00bb.<\/p>\n<p>Ces roches remontent \u00e0 environ 182 millions d\u2019ann\u00e9es. \u00c0 cette \u00e9poque, des pr\u00e9cipitations intenses favorisaient le transport de s\u00e9diments et de mati\u00e8re organique vers les profondeurs marines, o\u00f9 ils \u00e9taient d\u00e9pos\u00e9s par des courants sous-marins appel\u00e9s turbidites.<\/p>\n<p>Pour confirmer l\u2019origine biologique des structures, les chercheurs ont men\u00e9 des analyses microscopiques et g\u00e9ochimiques, r\u00e9v\u00e9lant des concentrations \u00e9lev\u00e9es de carbone juste sous les surfaces ondul\u00e9es, ce qui constitue un indice fort d\u2019une activit\u00e9 microbienne ancienne.<\/p>\n<p>Bien que ces ondulations ressemblent \u00e0 celles observ\u00e9es dans des environnements marins peu profonds, leur profondeur de formation et leur signature chimique racontent une autre histoire. Les chercheurs estiment que les microbes se nourrissaient de compos\u00e9s chimiques lib\u00e9r\u00e9s lors de la d\u00e9composition de la mati\u00e8re organique, notamment des compos\u00e9s soufr\u00e9s.<\/p>\n<p>Habituellement, les tapis microbiens sont d\u00e9truits par l\u2019activit\u00e9 animale avant d\u2019\u00eatre fossilis\u00e9s. Toutefois, dans ce cas pr\u00e9cis, les substances chimiques toxiques issues de la d\u00e9composition auraient \u00e9loign\u00e9 les animaux, permettant aux structures de se consolider et de s\u2019inscrire durablement dans le registre g\u00e9ologique.<\/p>\n<p>Cette d\u00e9couverte est jug\u00e9e particuli\u00e8rement importante, car elle d\u00e9montre que les structures ondul\u00e9es ne sont pas n\u00e9cessairement des indicateurs d\u2019environnements peu profonds et ensoleill\u00e9s, mais peuvent \u00e9galement se former dans des milieux marins profonds et obscurs. Les chercheurs consid\u00e8rent ce ph\u00e9nom\u00e8ne comme un \u00ab mode de pr\u00e9servation jusqu\u2019ici n\u00e9glig\u00e9 \u00bb, ouvrant de nouvelles perspectives pour l\u2019\u00e9tude de la vie ancienne.<\/p>\n<p class=\"ap-article-footer-note\">Retrouvez plus d\u2019actualit\u00e9s et d\u2019analyses sur <span class=\"ap-highlight-country\">l\u2019Afrique<\/span> sur le site <span class=\"ap-highlight-brand\">Africa Press<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press. Des scientifiques ont d\u00e9couvert d\u2019anciens motifs de \u00ab structures ondul\u00e9es \u00bb pr\u00e9serv\u00e9s dans des roches jurassiques au Maroc, r\u00e9v\u00e9lant qu\u2019ils se sont form\u00e9s dans des eaux profondes, hors de port\u00e9e de la lumi\u00e8re solaire. Ces r\u00e9sultats montrent que ces structures ne proviennent pas de microbes photosynth\u00e9tiques, mais d\u2019organismes microscopiques tirant leur \u00e9nergie de r\u00e9actions [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":4393,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[79],"tags":[240],"class_list":["post-4395","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","tag-lafrique"],"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>D\u00e9couverte de Structures Ondul\u00e9es Anciennes au Maroc - Africa Press France<\/title>\n<meta name=\"description\" content=\"-article-header-tag&quot;&gt; Africa-Press. 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