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Título del libro: Mineral Resources To Discover, Vols 1-4
Título del capítulo: New insights into the formation of multiples mineralization events in the San Dimas District, Mexico

Autores UNAM:
GILLES PIERRE RENE LEVRESSE; LUCA FERRARI;
Autores externos:

Idioma:

Año de publicación:
2017
Resumen:

The San Dimas district is a reference world-class silver-gold epithermal low sulfidation deposit. We present a re-evaluation of this district based on new U/Pb ages and field observation of mineralization styles. We identify a Late Cretaceous volcanic succession of the Lower Volcanic Complex correlative with the Tarahumara formation of southern of Sonora, which hosts subvolcanic Au-rich felsic mineralized bodies comparable to the Cu-Au porphyries of Sonora and Sinaloa. This succession is covered by intermediate lavas with hypabyssal intrusions (productive andesite) and is intruded by a Eocene batholith and several dike swarms. The final magmatic activity consists of silicic ignimbrites and less basaltic lava flows of Oligocene and early Miocene age. The main epithermal mineralization consists of two kind of veins, silver-gold and gold types, possibly related to different magmatic sources. Our study shows that there is a genetic link between low sulfidation silver-gold veins and felsic intrusion with porphyry mineralization, which were recycled by the Eocene batholithic intrusion.


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