Branquet Y. auteur aut IRD Laumonier B. auteur aut IRD Cheilletz A. auteur aut IRD Giuliani Gaston auteur aut IRD text journalArticle eng text/pdf reformatted digital access 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) specialized MINERAI GISEMENT ENDOGENE GEOCHIMIE MINERALISATION EVAPORITE TECTONIQUE CRETACE TERTIAIRE EOCENE OLIGOCENE EMERAUDE COLOMBIE 064GEOCHI 27 7 597-600 1999 0091-7613 https://www.documentation.ird.fr/hor/fdi:010019064 10.1130/0091-7613(1999)027<0597:EITECO>2.3.CO;2 0091-7613 [F B010019064] https://www.documentation.ird.fr/hor/fdi:010019064 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_7/b_fdi_51-52/010019064.pdf IRD - Base Horizon / Pleins textes 1999-09-22 2018-06-15 fdi:010019064 fre