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- [2] K-Ar and 40Ar/39Ar dating at 65 Ma of the Chivor-Macanal emerald deposits: evidence for an early tectonic event in the Eastern Cordillera of Colombia COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE II FASCICULE A-SCIENCES DE LA TERRE ET DES PLANETES, 1997, 324 (05): : 369 - 377