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Scienceil y a 2 heures
© JONATHAN NACKSTRAND / AFPDécouverte scientifique
Un volcan ou une météorite ? De nouvelles preuves éclairent une découverte intrigante dans la calotte glaciaire du Groenland
Enfouie au plus profond de la calotte glaciaire du Groenland se trouve une signature chimique mystérieuse qui a suscité un débat scientifique intense. Une forte augmentation des concentrations de platine, découverte dans une carotte de glace (un cylindre de glace extrait des calottes glaciaires et des glaciers) et datée d'environ 12 800 ans, étaye l'hypothèse selon laquelle la Terre aurait été frappée par une météorite ou une comète exotique à cette époque.
