{"id":94839,"date":"2025-02-08T16:46:52","date_gmt":"2025-02-08T16:46:52","guid":{"rendered":"https:\/\/www.africa-press.net\/cotedivoire\/politique\/les-traces-insoupconnees-dune-ancienne-activite-tectonique-sur-mars"},"modified":"2025-02-08T16:46:52","modified_gmt":"2025-02-08T16:46:52","slug":"les-traces-insoupconnees-dune-ancienne-activite-tectonique-sur-mars","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/les-traces-insoupconnees-dune-ancienne-activite-tectonique-sur-mars","title":{"rendered":"Les traces insoup\u00e7onn\u00e9es d\u2019une ancienne activit\u00e9 tectonique sur Mars"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. <\/strong><\/span>Mars posse\u0300de deux visages. Les deux tiers de l\u2019he\u0301misphe\u0300re nord sont couverts de plaines lisses, peu crate\u0301rise\u0301es, ou\u0300 divers engins robotise\u0301s comme le rover Perseverance ont pu se poser en raison de difficulte\u0301s moindres. Le reste de plane\u0300te arbore en effet des reliefs tre\u0300s accidente\u0301s culminant a\u0300 des altitudes plus hautes de 5 a\u0300 6 kilome\u0300tres !<\/p>\n<p>La crou\u0302te de l\u2019he\u0301misphe\u0300re sud est par ailleurs plus e\u0301paisse mais aussi plus vielle, comme l\u2019attestent des crate\u0300res plus nombreux (plus une surface plane\u0301taire est crate\u0301rise\u0301e, plus elle est ancienne) et les traces d\u2019une magne\u0301tisation qui existait lorsque notre voisine posse\u0301dait encore, a\u0300 l\u2019instar de la Terre, un champ magne\u0301tique global.<\/p>\n<p><b>Deux grandes the\u0301ories <\/b><\/p>\n<p>De\u0301couverte dans les anne\u0301es 1970 par les sondes ame\u0301ricaines Viking, cette disparite\u0301 unique dans le Syste\u0300me solaire \u2013 appele\u0301e \u00ab\u00a0dichotomie martienne\u00a0\u00bb \u2013 est reste\u0301e depuis lors une e\u0301nigme. Un sujet de de\u0301bat suscitant de nombreuses publications scientifiques depuis des dizaines d\u2019anne\u0301es. Deux grandes the\u0301ories ont e\u0301te\u0301 propose\u0301es. La premie\u0300re fait appel a\u0300 un phe\u0301nome\u0300ne exoge\u0300ne, venu de l\u2019espace: l\u2019asyme\u0301trie entre les deux he\u0301misphe\u0300res re\u0301sulterait de la collision catastrophique avec un aste\u0301roi\u0308de de la taille de la Lune qui aurait comple\u0300tement remodele\u0301 la surface de Mars.<\/p>\n<p>La seconde hypothe\u0300se privile\u0301gie pluto\u0302t une cause endoge\u0300ne issue des entrailles de la plane\u0300te: des diffe\u0301rences dans les transferts de chaleur interne auraient fait remonter les roches plus chaudes au niveau de l\u2019he\u0301misphe\u0300re sud, qui plongeraient pluto\u0302t dans les profondeurs de Mars au niveau de l\u2019he\u0301misphe\u0300re nord. Une sorte de tectonique des plaques, en somme, qui aurait sculpte\u0301 les paysages martiens !<\/p>\n<p><b>Des roches moins visqueuses et plus chaudes<\/b><\/p>\n<p>Les travaux d\u2019une e\u0301quipe de ge\u0301ologues chinois et australiens, publie\u0301s dans la revue Geophysical Research Letters, accre\u0301ditent le deuxie\u0300me sce\u0301nario. En analysant les ondes sismiques, en particulier leur atte\u0301nuation, de\u0301tecte\u0301es en 2022 sur Mars par la mission InSight (qui a atterri dans l\u2019he\u0301misphe\u0300re nord a\u0300 proximite\u0301 des hautes terres), ils ont de\u0301couvert que les roches du manteau sous l\u2019he\u0301misphe\u0300re sud e\u0301taient moins visqueuses et plus chaudes (1000\u00b0C contre 800\u00b0C environ) que celles du nord.<\/p>\n<p>L&rsquo;analyse des ondes sismiques de\u0301tecte\u0301es par Insight, notamment leur atte\u0301nuation, sugge\u0300re d&rsquo;importants mouvements de convection sous les hautes terres de l&rsquo;he\u0301misphe\u0300re sud. Cre\u0301dits: W. Sun et al. Geophysical Research Letters<\/p>\n<p>Ces diffe\u0301rences trahiraient des \u00ab\u00a0mouvements de convection beaucoup plus vigoureux sous les hautes terres du sud\u00a0\u00bb, e\u0301crivent les chercheurs. Ce qui sugge\u0300re, selon eux, que des processus tectoniques auraient fac\u0327onne\u0301 par le passe\u0301 les paysages martiens, avant de s\u2019interrompre et figer ces derniers dans l\u2019asyme\u0301trie actuelle. D\u2019autres donne\u0301es sismiques seront certes ne\u0301cessaires pour conclure de manie\u0300re de\u0301finitive. Mais la convection du manteau semble avoir joue\u0301 \u00ab\u00a0un ro\u0302le de\u0301terminant dans la formation de la dichotomie crustale de Mars\u00a0\u00bb, affirment les ge\u0301ologues.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">C\u00f4te d&rsquo;Ivoire<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<span style=\"color: #ff6600\"><\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. Mars posse\u0300de deux visages. Les deux tiers de l\u2019he\u0301misphe\u0300re nord sont couverts de plaines lisses, peu crate\u0301rise\u0301es, ou\u0300 divers engins robotise\u0301s comme le rover Perseverance ont pu se poser en raison de difficulte\u0301s moindres. Le reste de plane\u0300te arbore en effet des reliefs tre\u0300s accidente\u0301s culminant a\u0300 des altitudes plus hautes [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":94838,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[37],"class_list":["post-94839","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-cote-divoire-2"],"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>Les traces insoup\u00e7onn\u00e9es d\u2019une ancienne activit\u00e9 tectonique sur Mars - C\u00f4te d&#039;Ivoire<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/les-traces-insoupconnees-dune-ancienne-activite-tectonique-sur-mars\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les traces insoup\u00e7onn\u00e9es d\u2019une ancienne activit\u00e9 tectonique sur Mars\" \/>\n<meta property=\"og:description\" content=\"Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. Mars posse\u0300de deux visages. Les deux tiers de l\u2019he\u0301misphe\u0300re nord sont couverts de plaines lisses, peu crate\u0301rise\u0301es, ou\u0300 divers engins robotise\u0301s comme le rover Perseverance ont pu se poser en raison de difficulte\u0301s moindres. Le reste de plane\u0300te arbore en effet des reliefs tre\u0300s accidente\u0301s culminant a\u0300 des altitudes plus hautes [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/les-traces-insoupconnees-dune-ancienne-activite-tectonique-sur-mars\" \/>\n<meta property=\"og:site_name\" content=\"C\u00f4te d&#039;Ivoire\" \/>\n<meta property=\"article:published_time\" content=\"2025-02-08T16:46:52+00:00\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/les-traces-insoupconnees-dune-ancienne-activite-tectonique-sur-mars#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/les-traces-insoupconnees-dune-ancienne-activite-tectonique-sur-mars\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Les traces insoup\u00e7onn\u00e9es d\u2019une ancienne activit\u00e9 tectonique sur Mars\",\"datePublished\":\"2025-02-08T16:46:52+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/les-traces-insoupconnees-dune-ancienne-activite-tectonique-sur-mars\"},\"wordCount\":584,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/les-traces-insoupconnees-dune-ancienne-activite-tectonique-sur-mars#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/02\/sm_1739023328.38505.jpg\",\"keywords\":[\"C\u00f4te d'Ivoire\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/les-traces-insoupconnees-dune-ancienne-activite-tectonique-sur-mars#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/les-traces-insoupconnees-dune-ancienne-activite-tectonique-sur-mars\",\"url\":\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/les-traces-insoupconnees-dune-ancienne-activite-tectonique-sur-mars\",\"name\":\"Les traces insoup\u00e7onn\u00e9es d\u2019une ancienne activit\u00e9 tectonique sur Mars - 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