%0 Journal Article
%T Mineralizaci¨®n de talco asociada a los cuerpos ultram¨¢ficos de la Faja del R¨ªo de Las Tunas, Cordillera Frontal de Mendoza
%A Gargiulo
%A Mar¨ªa Florencia
%A Bjerg
%A Ernesto A
%J Serie correlaci£¿3n geol£¿3gica
%D 2012
%I Scientific Electronic Library Online
%X this contribution shows the main characteristics of the talc mineralization related to the r¨ªo de las tunas ultramafic bodies in the salamanca mining district, frontal cordillera of mendoza province. according to the parageneses defined on the studied samples, three generations of talc were established: 1o) crystallized in metaperidotites and related to the prograde stage of the regional metamorphism; 2o) crystallized in reaction zones (mostly in the talc zone) developed at the boundary between metaperidotites and their country-rocks. these reaction zones evidence a metasomatic process due to geochemical gradient between the ultramafic body and their country-rocks. this process was developed during the retrogression of the regional metamorphic cycle. 3o) talc present in shear-zones that cut across the ultramafic bodies. the extreme serpentinization of the ultramafic bodies is concentrated in shear-zones where the serpentine is subsequently replaced by talc ¡À carbonates related with a hydrothermal stage. aqueous fluids relatively enriched in co2 flowed through these shear-zones causing the cease of serpentine formation favoring the talc and/or carbonates. mined talc deposits are those in shear zones and reaction zones. they are mostly industrial-, asbestine- or talcschist-type. the talc related to the hydrothermal stage can locally reach first and extra qualities.
%K talc
%K ultramaphic bodies
%K r¨ªo de las tunas belt
%K frontal cordillera
%K mendoza.
%U http://www.scielo.org.ar/scielo.php?script=sci_abstract&pid=S1666-94792012000100009&lng=en&nrm=iso&tlng=en