Resumo

MARTINEZ, Facundo; FOGLIATA, Ana; MONTENEGRO, Nicolás  e  HAGEMANN, Steffen. Metalogénesis de la veta Farallón Negro rama norte, Farallón Negro, provincia de Catamarca. Rev. Asoc. Geol. Argent. [online]. 2014, vol.71, n.4, pp.553-561. ISSN 0004-4822.

The Rama Norte vein in Farallón Negro deposit is located in Hualfín, Belén Department, Catamarca. This deposit belongs to the Tertiary Farallón Negro Volcanic Complex, the wall rock of the gold rich vein system. The Farallón Negro Rama Norte vein strikes N40°W, dips 65° NE, has 600 m length extends from the surface to a depth of about 400 meters. The wall rock is a monzonite with different types of hydrothermal alteration: intermediate argillic, silicic, phyllic and propylitic. The vein is composed of quartz, carbonates and Mn-oxides with banded, colloform and massive textures. The geochemical analyses indicate that gold-bearing vein samples are generally Ag- and base-metal poor. Gold also displays a positive correlation with Sb, but a negative correlation with Mn. High trace element contents (As, Cu, Mo, Pb, V and Zn) of polymineralic Mn-oxides suggest a hydrothermal origin. The values of carbon and oxygen isotopes in carbonates indicate magmatic and meteoric fluids participation in the hydrothermal system.

Palavras-chave : Epithermal gold veins; Metallogenesis; Farallón Negro; Sierras Pampeanas Occidentales.

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