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Tout part d’un petit diamant découvert au Brésil, de seulement 5 millimètres mais qui renferme un cristal alors inconnu, la ringwoodite. Alors, quel est le rapport entre un petit diamant au Brésil et la découverte d’un immense océan souterrain caché à plus de 400 km de profondeur au centre de la Terre ? Réponse des […]"/>

Terre : un océan souterrain immense à 400 km de profondeur ?

Tout part d’un petit diamant découvert au Brésil, de seulement 5 millimètres mais qui renferme un cristal alors inconnu, la ringwoodite. Alors, quel est le rapport entre un petit diamant au Brésil et la découverte d’un immense océan souterrain caché à plus de 400 km de profondeur au centre de la Terre ? Réponse des géophysiciens canadiens qui ont étudié la ringwoodite.

Comment se forme un diamant ?

Le cristal découvert dans ce diamant, la ringwoodite, a la capacité de capturer les molécules d’eau et n’avait encore jamais été observé à l’état naturel ! Si les diamants sont découverts à la surface de la croute terrestre, l’étude de leur imperfection et de leur couleur permet de déterminer ou leur formation a eu lieu, souvent entre 150 et 200 kilomètres de profondeur !

Pourquoi la ringwoodite est différente ?

Le diamant brésilien étudiée par une équipe de chercheurs canadiens menée par Graham Pearson a révélé la présence d’une impureté inattendue : la ringwoodite. Seulement, la ringwoodite demande des conditions très particulières pour se former qui ne peuvent avoir lieu que dans une zone du manteau terrestre située entre 410 à 660 kilomètres, nommée zone de transition !

ocean-souterrain

Alors un océan caché au centre de la Terre ?

La ringwoodite contient 1,5% d’eau ce qui laisse penser aux chercheurs qu’une présence importante d’eau à 400 km sous le manteau terrestre est possible ! En effet, les études affirment que 60% des roches présentes dans cette zone du manteau terrestre soient riches en ringwoodite ce qui indiquerait qu’une présence très importante d’eau est a recensée à plus de 400 km de profondeur. Difficile de voir cet océan souterrain car le forage à l’aide de machine ne permet pas pour l’instant de descendre à plus de 12 kms…

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  1. plop
    9 avril 2014

    Et bien, au moins une chose qu’on ira pas détruire dans l’immédiat …

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