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SISTEMA INTEGRAL DE INFORMACIÓN ACADÉMICA - PÚBLICO
Título del libro: 17th Biennial Sga Meeting, 2023, Vol 1 Título del capítulo: Metallogenic model of the Eocene Zn-Pb(-Ag) Santa Maria and Antares bodies of the Velardena skarn district (Durango, Mexico)
The Santa Maria and Antares Zn-Pb skarn deposits from the Velardena mining district are located in central-NW Mexico. They lie 470 m apart from each other along the contact between Oligocene felsic bodies and Cretaceous limestones. The prograde stage in these systems was promoted by fluids at similar to 600 degrees C and 15 wt. % NaCl equiv., and was dominated by garne-twollastonite +/- vesuvianite +/- clinopyroxene and biotite +/- Kfeldspar +/- magnetite assemblages. The retrograde stage formed by fluids around 400 degrees C and similar to 20-50 wt. % NaCl equiv., is characterized by chlorite-amphibole-epidote-calcite-quartz-sericite-adularia-fluorite-muscovite along with sphalerite-pyrite-galena-pyrrhotite-arsenopyrite-chalcopyrite +/- fahlore +/- Bi-Sb-sulfosalts assemblages. delta O-18(calcite) data between 15 and 20 % in Santa Maria, and between 10 and 15 % in Antares show a less-modified magmatic affinity for the latter. delta C-13(calcite) values between 0 and -9 % register recycling processes of sedimentary C. Moreover, delta S-34(VCDT) values between -3 and 2 % revealed a magmatic source for S. Altogether, these data suggest that, in Santa Maria, magmatic-derived fluids actively interacted with the wall rocks, which did not occur at Antares. In both bodies, ore deposition was triggered by cooling and neutralization of the magmatic derived fluids. The Ar-40/Ar-39 ages for adularia at similar to 37.5 Ma place the deposits within the Eocene-early Miocene metallogenetic epoch of central-NW Mexico.
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ISBN: 9782839940443 Editorial: SOC GEOLOGY APPLIED MINERAL DEPOSITS-SGA