{"id":348020,"date":"2025-08-27T16:47:11","date_gmt":"2025-08-27T16:47:11","guid":{"rendered":"https:\/\/www.europesays.com\/fr\/348020\/"},"modified":"2025-08-27T16:47:11","modified_gmt":"2025-08-27T16:47:11","slug":"comment-la-terre-sest-transformee-en-boule-de-neige-il-y-a-717-millions-dannees","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/fr\/348020\/","title":{"rendered":"Comment la Terre s\u2019est transform\u00e9e en \u00abboule de neige\u00bb, il y a 717 millions d\u2019ann\u00e9es"},"content":{"rendered":"

D\u00c9CRYPTAGE <\/strong>– Une \u00e9tude tente d\u2019expliquer les m\u00e9canismes qui ont entra\u00een\u00e9 cet \u00e9pisode de glaciation totale, consid\u00e9r\u00e9 comme \u00abl\u2019un des \u00e9v\u00e9nements les plus extr\u00eames de l\u2019histoire climatique de la plan\u00e8te\u00bb.<\/p>\n

\u00c0 au moins trois reprises depuis sa formation, notre plan\u00e8te a \u00e9t\u00e9 enti\u00e8rement couverte de glace, des p\u00f4les \u00e0 l\u2019\u00e9quateur. Autrefois contest\u00e9s, ces \u00e9pisodes de \u00ab\u00a0Terre boule de neige\u00a0\u00bb (\u00ab\u00a0Snowball Earth\u00a0\u00bb en anglais) sont attest\u00e9s notamment par des traces de glaciers d\u00e9couvertes sur des territoires qui se trouvaient alors au niveau des tropiques. \u00ab\u00a0Ces glaciations mondiales comptent parmi les \u00e9v\u00e9nements les plus extr\u00eames de l\u2019histoire climatique de la plan\u00e8te et ont probablement eu un impact profond sur l\u2019\u00e9volution de la vie, note Charlotte Minsky, chercheuse au d\u00e9partement des sciences de la Terre et des plan\u00e8tes de l\u2019universit\u00e9 am\u00e9ricaine de\u00a0Harvard<\/a>. Mais leurs causes sont longtemps rest\u00e9es un myst\u00e8re.\u00a0\u00bb<\/p>\n

Dans un article publi\u00e9 dans le\u00a0Journal of Geophysical Research\u00a0: Planets<\/a>, son \u00e9quipe s\u2019est pench\u00e9e sur l\u2019origine de l\u2019un de ces \u00e9v\u00e9nements extr\u00eames, la glaciation sturtienne, qui s\u2019est enclench\u00e9e il y a 717\u00a0millions d\u2019ann\u00e9es et a dur\u00e9 environ 60\u00a0millions d\u2019ann\u00e9es. Les\u2026<\/p>\n

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