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Boletín de la Sociedad Geológica Mexicana Volumen 67, núm. 2, 2015, p. 357-366 http://dx.doi.org/10.18268/BSGM2015v67n2a16 |
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Short Note
Geochronology of Mexican mineral deposits. III: the Taxco epithermal deposits, Guerrero
José L. Farfán-Panamá1,2, Antoni Camprubí3,*, Eduardo González-Partida4, Alexander Iriondo4, Enrique Gonzalez-Torres3,5
1 Unidad Académica de Ciencias de la Tierra, Universidad Autónoma de Guerrero, Ex-Hacienda de San Juan Bautista, 40323 Taxco el Viejo, Gro., México.
2Programa de Posgrado en Ciencias de la Tierra, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, 76230 Querétaro, Qro., México.
3 Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510, D.F., Mexico.
4Centro de Geociencias, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, 76230 Querétaro, Qro., Mexico.
5Facultad de Ingeniería, Universidad Nacional Autónoma de México. Ciudad Universitaria, 04510, D.F., Mexico.
* This email address is being protected from spambots. You need JavaScript enabled to view it.
Abstract
New 40Ar/39Ar (34.96 ± 0.19 Ma) and U-Pb ages (35.44 ± 0.24 and 34.95 ± 0.37 Ma) obtained in this study for the Calavera group of dikes, which predate intermediate sulfidation epithermal mineralization in the Taxco mining district, constrain the formation of such deposits to less than 34.96 Ma (latest Eocene). These deposits might arguably have formed at ~ 33 Ma, thus coinciding in age with the La Azul fluorite deposits, within the same district. Although this age is significantly younger than previously existing estimations, the deposits at Taxco consistently cluster into a Late Eocene to Oligocene metallogenic event. Such event was closely associated with the volcanism in the northern part of the Sierra Madre del Sur, specifically to the most prominent flare-up of subduction-derived volcanism before it ceased in the region and refashioned into the Trans-Mexican Volcanic Belt.
Keywords: Taxco, Mexico, epithermal deposits, intermediate sulfidation, 40Ar/39Ar ages, U-Pb ages, zircon.
