{"id":150,"date":"2014-03-24T19:43:10","date_gmt":"2014-03-24T19:43:10","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/frankel\/?p=150"},"modified":"2014-04-22T08:30:09","modified_gmt":"2014-04-22T08:30:09","slug":"cratere-bien-jeune","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/frankel\/2014\/03\/24\/cratere-bien-jeune\/","title":{"rendered":"Un crat\u00e8re bien jeune&#8230;"},"content":{"rendered":"<figure id=\"attachment_153\" aria-describedby=\"caption-attachment-153\" style=\"width: 467px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/frankel\/wp-content\/uploads\/sites\/7\/2014\/03\/Mojave-Crater-mid-res.jpg\" rel=\"lightbox[150]\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-153\" src=\"https:\/\/blogs.futura-sciences.com\/frankel\/wp-content\/uploads\/sites\/7\/2014\/03\/Mojave-Crater-mid-res-300x168.jpg\" alt=\"Le crat\u00e8re Mojave reconstitu\u00e9 en 3D par recoupement d'images du satellite Mars Reconnaissance Orbiter (NASA)\" width=\"467\" height=\"261\" \/><\/a><figcaption id=\"caption-attachment-153\" class=\"wp-caption-text\">Le crat\u00e8re Mojave reconstitu\u00e9 en 3D par recoupement d&#8217;images du satellite Mars Reconnaissance Orbiter (NASA)<\/figcaption><\/figure>\n<p>Voici un crat\u00e8re martien qui fait parler de lui. Baptis\u00e9 Mojave, parce qu\u2019il contient des figures d\u2019\u00e9rosion qui font penser \u00e0 celles de la pluie dans le d\u00e9sert de Californie, ce crat\u00e8re est le plus gros impact r\u00e9cent sur Mars\u00a0: large de 60\u00a0km, il r\u00e9sulterait de la collision d\u2019un ast\u00e9ro\u00efde avec la plan\u00e8te rouge, il y a moins de 5 millions d\u2019ann\u00e9es. Or on cherche l\u2019endroit sur Mars d\u2019o\u00f9 auraient \u00e9t\u00e9 \u00e9ject\u00e9 les m\u00e9t\u00e9orites martiennes retomb\u00e9es sur Terre, et dont l\u2019\u00e9jection dans l\u2019espace aurait eu lieu dans un proche pass\u00e9. Mojave se pose donc en excellent candidat de cette \u00e9jection et livraison d\u2019\u00e9chantillons.<\/p>\n<p><!--more--><\/p>\n<p>Reste \u00e0 prendre en compte l\u2019ancien terrain, vieux de 4 <i>milliards<\/i> d\u2019ann\u00e9es dont l\u2019impact aurait \u00e9ject\u00e9 des fragments. Certains chercheurs y voient l\u2019origine de la m\u00e9t\u00e9orite ALH\u00a084001, une roche magmatique vieille justement de 4 milliards d\u2019ann\u00e9es, qui d\u00e9fraya autrefois la chronique (en 1996) parce qu\u2019elle semblait abriter des microfossiles de bact\u00e9ries. Ce crat\u00e8re en serait-il la source\u00a0? D\u2019autres chercheurs y voient l\u2019origine d\u2019une autre s\u00e9rie de m\u00e9t\u00e9orites martiennes\u2014les <i>shergottites<\/i>\u2014parce qu\u2019elles sont riches en pyrox\u00e8ne (un min\u00e9ral ferromagn\u00e9sien) et que le crat\u00e8re r\u00e9v\u00e8le dans ses roches fracass\u00e9es une belle teneur en pyrox\u00e8ne, d&#8217;apr\u00e8s t\u00e9l\u00e9d\u00e9tection depuis orbite. Seul b\u00e9mol\u00a0: l\u2019\u00e2ge des shergottites (moins de 600 millions d\u2019ann\u00e9es) est bien inf\u00e9rieur \u00e0 l\u2019\u00e2ge pr\u00e9sum\u00e9 du terrain fracass\u00e9 par l\u2019impact (4 milliards d\u2019ann\u00e9es).<\/p>\n<p>Mon avis\u00a0: ce crat\u00e8re semble bigrement bien situ\u00e9 et bien dat\u00e9 pour \u00eatre la source d\u2019ALH\u00a084001 (\u00e9galement riche en pyrox\u00e8ne), sans chercher \u00e0 le faire coller avec les m\u00e9t\u00e9orites plus jeunes. Ce qui ext d\u00e9j\u00e0 extraordinaire en soi\u2026<\/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>Voici un crat\u00e8re martien qui fait parler de lui. Baptis\u00e9 Mojave, parce qu\u2019il contient des figures d\u2019\u00e9rosion qui font penser \u00e0 celles de la pluie dans le d\u00e9sert de Californie, ce crat\u00e8re est le plus gros impact r\u00e9cent sur Mars\u00a0: large de 60\u00a0km, il r\u00e9sulterait de la collision d\u2019un ast\u00e9ro\u00efde avec la plan\u00e8te rouge, il &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/frankel\/2014\/03\/24\/cratere-bien-jeune\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Un crat\u00e8re bien jeune&#8230;<\/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":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[8],"tags":[38,23,37,36,39],"class_list":["post-150","post","type-post","status-publish","format-standard","hentry","category-image-de-la-semaine","tag-alh84001","tag-mars","tag-meteorite-martienne","tag-mojave","tag-shergottite"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Un crat\u00e8re bien jeune... - Carnets de bord d\u2019un martien, le blog de Charles FRANKEL, g\u00e9ologue<\/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:\/\/blogs.futura-sciences.com\/frankel\/2014\/03\/24\/cratere-bien-jeune\/\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Charles Frankel\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/frankel\/2014\/03\/24\/cratere-bien-jeune\/\",\"url\":\"https:\/\/blogs.futura-sciences.com\/frankel\/2014\/03\/24\/cratere-bien-jeune\/\",\"name\":\"Un crat\u00e8re bien jeune... - Carnets de bord d\u2019un martien, le blog de Charles FRANKEL, g\u00e9ologue\",\"isPartOf\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/frankel\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/frankel\/2014\/03\/24\/cratere-bien-jeune\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/frankel\/2014\/03\/24\/cratere-bien-jeune\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blogs.futura-sciences.com\/frankel\/wp-content\/uploads\/sites\/7\/2014\/03\/Mojave-Crater-mid-res-300x168.jpg\",\"datePublished\":\"2014-03-24T19:43:10+00:00\",\"dateModified\":\"2014-04-22T08:30:09+00:00\",\"author\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/frankel\/#\/schema\/person\/c6bf521c6d19bf22fb19fb2b3d6fcf63\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/blogs.futura-sciences.com\/frankel\/2014\/03\/24\/cratere-bien-jeune\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/frankel\/2014\/03\/24\/cratere-bien-jeune\/#primaryimage\",\"url\":\"https:\/\/blogs.futura-sciences.com\/frankel\/wp-content\/uploads\/sites\/7\/2014\/03\/Mojave-Crater-mid-res.jpg\",\"contentUrl\":\"https:\/\/blogs.futura-sciences.com\/frankel\/wp-content\/uploads\/sites\/7\/2014\/03\/Mojave-Crater-mid-res.jpg\",\"width\":1920,\"height\":1080,\"caption\":\"Le crat\u00e8re Mojave reconstitu\u00e9 en 3D par recoupement d'images du satellite Mars Reconnaissance Orbiter (NASA)\"},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/frankel\/#website\",\"url\":\"https:\/\/blogs.futura-sciences.com\/frankel\/\",\"name\":\"Carnets de bord d\u2019un martien, le blog de Charles FRANKEL, g\u00e9ologue\",\"description\":\"La science ? 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