{"id":20821,"date":"2025-10-03T16:29:18","date_gmt":"2025-10-03T16:29:18","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=20821"},"modified":"2025-10-20T12:44:27","modified_gmt":"2025-10-20T12:44:27","slug":"mars-decouvrez-letrange-deversoir-de-ceraunius-tholus","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/10\/03\/mars-decouvrez-letrange-deversoir-de-ceraunius-tholus\/","title":{"rendered":"Mars : d\u00e9couvrez l&#8217;\u00e9trange d\u00e9versoir de Ceraunius Tholus"},"content":{"rendered":"<p><strong>Moins c\u00e9l\u00e8bre qu&#8217;Olympus Mons, le volcan martien Ceraunius Tholus pr\u00e9sente une morphologie qui intrigue les plan\u00e9tologues.<\/strong><\/p>\n<h5>G\u00e9ants endormis :<\/h5>\n<p>Les volcans martiens sont gigantesques, et ce n&#8217;est pas <em>Ceraunius Tholus<\/em> qui nous contredira. Situ\u00e9 dans le prolongement de <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Tharsis_Montes\" target=\"_blank\" rel=\"noopener\"><em>Tharsis Montes<\/em><\/a>, il culmine \u00e0 plus de 8.000 m\u00e8tres au-dessus du niveau de r\u00e9f\u00e9rence. Certes, nous sommes tr\u00e8s loin du record d&#8217;<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/10\/06\/au-plus-pres-de-la-terre-mars-nous-devoile-olympus-mons\/\" target=\"_blank\" rel=\"noopener\"><em>Olympus Mons<\/em><\/a> (22 kilom\u00e8tres d&#8217;altitude), mais d\u00e9j\u00e0 plus de mille m\u00e8tres au-dessus du <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Nevado_Ojos_del_Salado\" target=\"_blank\" rel=\"noopener\"><em>Nevado Ojos del Salado<\/em><\/a>, le plus grand volcan terrestre :<\/p>\n<figure id=\"attachment_20825\" aria-describedby=\"caption-attachment-20825\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/02\/ceraunius5.jpg\" rel=\"lightbox[20821]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-20825\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/02\/ceraunius5-450x333.jpg\" alt=\"\" width=\"450\" height=\"333\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/02\/ceraunius5-450x333.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/02\/ceraunius5-1024x758.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/02\/ceraunius5-768x568.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/02\/ceraunius5.jpg 1265w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-20825\" class=\"wp-caption-text\">Carte de localisation des principaux grands volcans martiens. \u00a9 NASA<\/figcaption><\/figure>\n<p>Le gigantisme des volcans martiens s&#8217;explique par l&#8217;absence de tectonique des plaques. Sur Terre, la d\u00e9rive des plaques provoque un d\u00e9placement des <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Point_chaud_(g%C3%A9ologie)\" target=\"_blank\" rel=\"noopener\">points chauds<\/a>, ce qui donne naissance \u00e0 des cha\u00eenes de volcans. Sur Mars, les points chauds ne bougent pas et s&#8217;\u00e9panchent toujours par le m\u00eame orifice, cr\u00e9ant des volcans beaucoup plus volumineux. Des g\u00e9ants endormis depuis peu \u00e0 l&#8217;\u00e9chelle g\u00e9ologique. En effet, les traces de volcanisme martien les plus r\u00e9centes (dans <a href=\"https:\/\/hirise.lpl.arizona.edu\/fr\/ESP_023798_1895\" target=\"_blank\" rel=\"noopener\"><em>Cerberus fossae<\/em><\/a>) remontent \u00e0 environ 53.000 ans.\u00a0 <!--more--><\/p>\n<h5>D\u00e9versoir dans un crat\u00e8re :<\/h5>\n<p><em>Ceraunius Tholus<\/em> (<em>tholus<\/em> signifie d\u00f4me conique en latin) mesure \u00e0 la base 130 kilom\u00e8tres. Son sommet poss\u00e8de une caldeira de 25 kilom\u00e8tres de diam\u00e8tre. Sur ses flancs, on remarque plusieurs chenaux, dont un plus important. Large de 3 kilom\u00e8tres et profond de 500 m\u00e8tres, il fait penser \u00e0 un tube de lave effondr\u00e9 (comme <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/12\/19\/rima-hyginus-letrange-rainure-lunaire\/\" target=\"_blank\" rel=\"noopener\"><em>Rima Hyginus<\/em><\/a> sur la Lune) :<\/p>\n<figure id=\"attachment_20826\" aria-describedby=\"caption-attachment-20826\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/02\/ceraunius2.jpg\" rel=\"lightbox[20821]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-20826\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/02\/ceraunius2-450x388.jpg\" alt=\"\" width=\"450\" height=\"388\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/02\/ceraunius2-450x388.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/02\/ceraunius2-768x662.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/02\/ceraunius2.jpg 1024w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-20826\" class=\"wp-caption-text\">Ceraunius Tholus photographi\u00e9 par la sonde europ\u00e9enne Mars Express. \u00a9 ESA<\/figcaption><\/figure>\n<p>Mais c&#8217;est peut-\u00eatre de l&#8217;eau qui est pass\u00e9e par l\u00e0. La vidange d&#8217;un ancien lac aurait pu creuser un tel chenal dans un sol tendre, une couche de cendres par exemple. Le plus \u00e9tonnant, c&#8217;est le terminus de ce chenal : un bassin allong\u00e9 qui est en r\u00e9alit\u00e9 un crat\u00e8re m\u00e9t\u00e9oritique ! Form\u00e9e par un impact oblique plus ancien, cette excavation est sans doute \u00e0 l&#8217;origine d&#8217;une dissym\u00e9trie dans le profil du volcan, comme le montre une vue en 3D :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/02\/ceraunius1.jpg\" rel=\"lightbox[20821]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-20827\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/02\/ceraunius1-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/02\/ceraunius1-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/02\/ceraunius1-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/02\/ceraunius1-768x460.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/02\/ceraunius1.jpg 1501w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/01\/20\/mars-au-plus-pres-de-la-terre-admirez-syrtis-major\/\" target=\"_blank\" rel=\"noopener\">Mars au plus pr\u00e8s de la Terre : admirez Syrtis Major<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/01\/11\/mars-express-vingt-ans-en-orbite-martienne\/\" target=\"_blank\" rel=\"noopener\">Mars Express : vingt ans en orbite martienne !<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/11\/08\/une-nouvelle-grotte-photographiee-sur-mars\/\" target=\"_blank\" rel=\"noopener\">Une nouvelle grotte photographi\u00e9e sur Mars<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/a>\u00a0et sur\u00a0<a href=\"https:\/\/bsky.app\/profile\/cielmania.bsky.social\" target=\"_blank\" rel=\"noopener\">Bluesky<\/a>.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Moins c\u00e9l\u00e8bre qu&#8217;Olympus Mons, le volcan martien Ceraunius Tholus pr\u00e9sente une morphologie qui intrigue les plan\u00e9tologues. G\u00e9ants endormis : Les volcans martiens sont gigantesques, et ce n&#8217;est pas Ceraunius Tholus qui nous contredira. Situ\u00e9 dans le prolongement de Tharsis Montes, il culmine \u00e0 plus de 8.000 m\u00e8tres au-dessus du niveau de r\u00e9f\u00e9rence. Certes, nous sommes &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/10\/03\/mars-decouvrez-letrange-deversoir-de-ceraunius-tholus\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Mars : d\u00e9couvrez l&#8217;\u00e9trange d\u00e9versoir de Ceraunius Tholus<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":20823,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[3720,116,2925,3721,3],"class_list":["post-20821","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-ceraunius-tholus","tag-mars","tag-olympus-mons","tag-tharsis-montes","tag-volcan"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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