{"id":70550,"date":"2025-08-12T11:00:00","date_gmt":"2025-08-12T11:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/?p=70550"},"modified":"2025-08-12T08:03:38","modified_gmt":"2025-08-12T08:03:38","slug":"origine-extraterrestre-de-leau-sur-terre","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/origine-extraterrestre-de-leau-sur-terre","title":{"rendered":"Origine Extraterrestre de L\u2019Eau sur Terre"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Senegal. <\/strong><\/span>L\u2019eau des oce\u0301ans, lacs, rivie\u0300res, banquises, ainsi que celle se\u0301questre\u0301e a\u0300 des centaines de kilome\u0300tres de profondeur dans les roches du manteau est pre\u0301sente sur notre plane\u0300te depuis les premie\u0300res e\u0301tapes de sa formation il y a 4,6 milliards d\u2019anne\u0301es, soutient une e\u0301quipe des ge\u0301ologues de l\u2019universite\u0301 d\u2019Oxford (Royaume-Uni) dans la revue Icarus. Dans sa tre\u0300s grande majorite\u0301, elle n\u2019a pas e\u0301te\u0301 apporte\u0301e par des corps extraterrestres riches en eau \u2013 come\u0300tes et aste\u0301roi\u0308des \u2013 qui se sont e\u0301crase\u0301s par la suite sur la Terre, comme les scientifiques tendaient a\u0300 le penser depuis des dizaines d\u2019anne\u0301es.<\/p>\n<p>En 2020, des chercheurs du Centre de recherches pe\u0301trographiques et ge\u0301ochimiques (CRPG) a\u0300 Vand\u0153uvre-le\u0300s-Nancy (Meurthe-et-Moselle) avaient fourni les premie\u0300res preuves de ce sce\u0301nario. Ils avaient analyse\u0301 un certain type de me\u0301te\u0301orites, appele\u0301es \u00ab chondrites a\u0300 enstatite \u00bb, dont la composition chimique est quasiment identique aux roches terrestres: elles se sont forme\u0301es en effet dans la me\u0302me re\u0301gion du Syste\u0300me solaire que la Terre primitive, et auraient servi ainsi de mate\u0301riau de base lors du processus d\u2019accre\u0301tion.<\/p>\n<p><b>Des roches tre\u0300s se\u0300ches, mais pas totalement<\/b><\/p>\n<p>Les scientifiques e\u0301taient persuade\u0301s que les chondrites a\u0300 enstatites e\u0301taient totalement se\u0300ches, d\u2019ou\u0300 l\u2019ide\u0301e que l\u2019eau de la Terre avait e\u0301te\u0301 apporte\u0301e ulte\u0301rieurement par d\u2019autres objets riches en eau. Mais l\u2019e\u0301quipe nance\u0301enne a de\u0301couvert qu\u2019elles contenaient en re\u0301alite\u0301 une toute petite quantite\u0301 d\u2019eau: quelques dixie\u0300mes de pourcents. Mais puisque ces roches ont forme\u0301 la totalite\u0301 de notre plane\u0300te, soit un volume faramineux, elles contiendraient assez d\u2019eau pour expliquer la tre\u0300s grande majorite\u0301 du stock actuel.<\/p>\n<p><b>Possible contamination<\/b><\/p>\n<p>Cette the\u0301orie attendait toutefois d\u2019e\u0302tre confirme\u0301e par d\u2019autres re\u0301sultats et e\u0301tudes inde\u0301pendantes, sachant qu\u2019il existe tre\u0300s peu de chondrites a\u0300 enstatite dans les collections de me\u0301te\u0301orites (environ 200 spe\u0301cimens sur quelque 70.000 me\u0301te\u0301orites de tous types re\u0301pertorie\u0301es a\u0300 ce jour), et que ces roches pre\u0301sentent souvent de tre\u0300s importants signes d\u2019alte\u0301ration. Des doutes subsistaient ainsi sur les mesures des chimistes du CRPG: leurs interpre\u0301tations auraient pu e\u0302tre fausse\u0301es, en effet, par une possible contamination avec des mate\u0301riaux terrestres.<\/p>\n<p><b>Se\u0301rendipite\u0301<\/b><\/p>\n<p>Mais ces re\u0301serves viennent d\u2019e\u0302tre leve\u0301es par l\u2019e\u0301quipe britannique qui s\u2019est penche\u0301e sur un autre e\u0301chantillon: une chondrite a\u0300 enstatite de 147 grammes re\u0301cupe\u0301re\u0301e en 2012 en Antarctique, appele\u0301e \u00ab LAR 12252 \u00bb. Gra\u0302ce au synchrotron Diamond Light Source situe\u0301 dans l\u2019Oxfordshire, les chercheurs ont re\u0301alise\u0301 des analyses plus e\u0301tendues que pre\u0301ce\u0301demment: dans les parties non cristallines, ou\u0300 l\u2019hydroge\u0300ne avait de\u0301ja\u0300 e\u0301te\u0301 de\u0301tecte\u0301, mais aussi cristallines \u2013 et ce un peu par hasard explique un communique\u0301 de l\u2019universite\u0301 d\u2019Oxford.<\/p>\n<p><b>Des quantite\u0301s cinq fois plus importantes<\/b><\/p>\n<p>Or les mesures ont re\u0301ve\u0301le\u0301 que les parties cristallines contiennent aussi de l\u2019hydroge\u0300ne, associe\u0301 a\u0300 du soufre&#8230; mais en quantite\u0301 cinq fois plus importante que l\u2019e\u0301tude de 2020 ! De quoi balayer encore plus l\u2019hypothe\u0300se d\u2019une origine extraterrestre de l\u2019eau. \u00ab Nous avons e\u0301te\u0301 extre\u0302mement enthousiastes lorsque les analyses ont re\u0301ve\u0301le\u0301 la pre\u0301sence de sulfure d\u2019hydroge\u0300ne dans l\u2019e\u0301chantillon, mais pas la\u0300 ou\u0300 nous l\u2019attendions, te\u0301moigne Thomas Barrett, auteur principal de l\u2019e\u0301tude. La probabilite\u0301 que ce sulfure d\u2019hydroge\u0300ne provienne d\u2019une contamination terrestre e\u0301tant tre\u0300s faible, ces travaux apportent des preuves essentielles a\u0300 l\u2019appui de la the\u0301orie selon laquelle l\u2019eau sur Terre est native, c\u2019est-a\u0300-dire un produit naturel de la composition de notre plane\u0300te. \u00bb<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">Senegal<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Senegal. L\u2019eau des oce\u0301ans, lacs, rivie\u0300res, banquises, ainsi que celle se\u0301questre\u0301e a\u0300 des centaines de kilome\u0300tres de profondeur dans les roches du manteau est pre\u0301sente sur notre plane\u0300te depuis les premie\u0300res e\u0301tapes de sa formation il y a 4,6 milliards d\u2019anne\u0301es, soutient une e\u0301quipe des ge\u0301ologues de l\u2019universite\u0301 d\u2019Oxford (Royaume-Uni) dans la revue [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":70549,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-70550","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-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>Origine Extraterrestre de L\u2019Eau sur Terre - 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