Branquet Y., Laumonier B., Cheilletz A., Giuliani Gaston. (1999). Emeralds in the Eastern cordillera of Colombia : two tectonic settings for one mineralization. Geology, 27 (7), p. 597-600. ISSN 0091-7613.
Titre du document
Emeralds in the Eastern cordillera of Colombia : two tectonic settings for one mineralization
Année de publication
1999
Type de document
Article
Auteurs
Branquet Y., Laumonier B., Cheilletz A., Giuliani Gaston
Source
Geology, 1999,
27 (7), p. 597-600 ISSN 0091-7613
Colombian emeralds are formed through a hydrothermal-sedimentary process. On the western side of the Eastern Cordillera, the deposits are linked by tear faults and associated thrusts developed during a compressive tectonic phase that occurred at the time of the Eocene-Oligocene boundary, prior to the major uplift of the Cordillera during the Andean phase (middle Miocene). On the eastern side of the Cordillera, emerald mineralization occurred earlier, at the time of the Cretaceous-Teritary boundary, during a thin-skinned extensional tectonic event linked to evaporite dissolution. This event predates the Andean phase, during which this part of the chain was folded and thrust over the Llanos foreland. (Résumé d'auteur)
