{"id":8455,"date":"2012-07-13T09:00:55","date_gmt":"2012-07-13T07:00:55","guid":{"rendered":"https:\/\/www.gold.fr\/news\/?p=8455"},"modified":"2017-11-02T11:35:38","modified_gmt":"2017-11-02T10:35:38","slug":"mais-dou-vient-lor-de-la-terre","status":"publish","type":"post","link":"https:\/\/www.gold.fr\/news\/2012\/07\/13\/mais-dou-vient-lor-de-la-terre\/","title":{"rendered":"Mais d\u2019o\u00f9 vient l&rsquo;or de la Terre ?"},"content":{"rendered":"<p><span style=\"font-size: small;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-thumbnail wp-image-3004\" title=\"l'Or de la Terre\" src=\"https:\/\/www.gold.fr\/news\/wp-content\/uploads\/2011\/10\/Nouvelle-vague-de-corrections-pour-l\u2019or-\u2013-Les-raisons-150x150.jpg\" alt=\"\" width=\"150\" height=\"150\" \/>En voila une excellente question ! Ce m\u00e9tal si pr\u00e9cieux a forc\u00e9ment une origine mais laquelle ? A cette question s&rsquo;est int\u00e9ress\u00e9 le docteur <strong>Gerhard Schmidt<\/strong> de l&rsquo;Universit\u00e9 de Mainz, en Allemagne. Il semble que des \u00e9l\u00e9ments en abondance dans la cro\u00fbte terrestre proviendraient de la chute d&rsquo;environ 160 m\u00e9t\u00e9orites m\u00e9talliques, constituant ainsi notre r\u00e9serve en <a href='https:\/\/www.gold.fr\/news\/tags\/or' class='esk-seo-plu-link'>or<\/a> et en platine.<\/span>    <span style=\"font-size: small;\">Cette origine est \u00e9tudi\u00e9e dans le cadre du domaine de la <strong>cosmochimie<\/strong>. Il s&rsquo;agit d&rsquo;une branche de la chimie qui s&rsquo;appuie sur les r\u00e9actions \u00e0 l&rsquo;\u0153uvre dans les nuages interstellaires. Cette discipline traite aussi des disques d&rsquo;accr\u00e9tion \u00e0 l&rsquo;origine des syst\u00e8mes plan\u00e9taires. Ainsi, c&rsquo;est la cosmochimie qui s&rsquo;int\u00e9resse \u00e0 la formation et \u00e0 l&rsquo;\u00e9volution de la Terre.<\/span>    <span style=\"font-size: small;\">Pendant plus de 10 ans de travail, le g\u00e9ochimiste <strong>Gerhard Schmidt<\/strong> a travaill\u00e9 avec ses coll\u00e8gues pour d\u00e9terminer la composition de la cro\u00fbte terrestre et expliquer la pr\u00e9sence de certains m\u00e9taux connus. Ainsi ils sont arriv\u00e9 \u00e0 expliquer leur pr\u00e9sence par la chute de pr\u00e8s de 160 m\u00e9t\u00e9orites m\u00e9talliques, d&rsquo;un diam\u00e8tre moyen de 20 kilom\u00e8tres, sur la plan\u00e8te.<\/span>    <span style=\"font-size: small;\">Mais le noyau m\u00e9tallique de la Terre ne s&rsquo;est pas fait rapidement, il faudra compter des dizaines de millions d&rsquo;ann\u00e9es. Le ph\u00e9nom\u00e8ne est identique sur Mars, si l&rsquo;on se r\u00e9f\u00e8re aux m\u00e9t\u00e9orites d&rsquo;origine martienne connues sur Terre.<\/span><\/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>En voila une excellente question ! Ce m\u00e9tal si pr\u00e9cieux a forc\u00e9ment une origine mais laquelle ? A cette question s&rsquo;est int\u00e9ress\u00e9 le docteur Gerhard Schmidt de l&rsquo;Universit\u00e9 de Mainz, en Allemagne. Il semble que des [&hellip;]<\/p>\n","protected":false},"author":18,"featured_media":3004,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mbp_gutenberg_autopost":false,"_pgmb_is_evergreen":false,"_pgmb_ap_template_id":0,"footnotes":""},"categories":[6],"tags":[671,76,670,669],"ppma_author":[2565],"class_list":["post-8455","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles-de-presse","tag-gerhard-schmidt","tag-or","tag-or-de-la-terre","tag-origine-or"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Mais d\u2019o\u00f9 vient l&#039;or de la Terre ? - Gold.fr<\/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.gold.fr\/news\/2012\/07\/13\/mais-dou-vient-lor-de-la-terre\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mais d\u2019o\u00f9 vient l&#039;or de la Terre ? - Gold.fr\" \/>\n<meta property=\"og:description\" content=\"En voila une excellente question ! Ce m\u00e9tal si pr\u00e9cieux a forc\u00e9ment une origine mais laquelle ? A cette question s&rsquo;est int\u00e9ress\u00e9 le docteur Gerhard Schmidt de l&rsquo;Universit\u00e9 de Mainz, en Allemagne. 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