Geochemical homogeneity of hydrothermal alteration in the orogenic gold belt of NW Sonora, Mexico: study of mass balance in host rocks in the mineralized areas
Por:
Izaguirre, A, Iriondo, A, Caballero-Martinez, JA, Moreira-Rivera, F, Espinosa-Aramburu, E
Publicada:
1 ene 2012
Categoría:
Earth and Planetary Sciences (miscellaneous)
Resumen:
A geochemical mass balance study, combined with petrography, bivariate Au and Ag geochemical analysis, and inclusion study in pyrites and native gold, was performed on a suite of hydrothermally altered host rocks and contemporaneous quartz veins from the Caborca Orogenic Gold Belt in NW Sonora, Mexico (COOC; by its abbreviations in Spanish: Cintur n de Oro Orog nico Caborca). These combined studies helped evaluating the geochemical homogeneity of the mineralizing fluids that formed the alteration envelopes and the auriferous quartz veins in the entire area occupying the COOC (similar to 400 km long and similar to 60-80 km wide belt). The isocon statistical technique used in the mass balance study was applied on 20 pairs of mayor and trace element geochemical data of altered and fresh rock samples. The results show that the majority (> 50 %) of the altered host rocks are enriched in K2O, W, Cu, Pb, Mo, Tl, Be, Zn, V, Sb, Ag, Sn, SiO2, Se, Ni and FeO, and are clearly depleted in Ca, Y, N
Filiaciones:
Izaguirre, A:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Juriquilla 76230, Queretaro, Mexico
Iriondo, A:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Juriquilla 76230, Queretaro, Mexico
Univ Texas Austin, Dept Geol Sci, Jackson Sch Geosci, Austin, TX 78712 USA
Caballero-Martinez, JA:
Serv Geol Mexicano, Colonia Venta Prieta Pac 42080, Hidalgo, Mexico
Moreira-Rivera, F:
Serv Geol Mexicano, Colonia Venta Prieta Pac 42080, Hidalgo, Mexico
Espinosa-Aramburu, E:
Serv Geol Mexicano, Colonia Venta Prieta Pac 42080, Hidalgo, Mexico
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