INSUGEO 12554
INSTITUTO SUPERIOR DE CORRELACION GEOLOGICA
Unidad Ejecutora - UE
artículos
Título:
Análisis comparativo de los greisen asociados a los depósitos de Sn-W en las sierra de Fiambalá y Mazán (provincias de Catamarca y la Rioja)
Autor/es:
FOGLIATA, ANA; AVILA JULIO; LAZARTE JOSÉ
Revista:
Acta Geológica Lilloana
Editorial:
Fundación Miguel Lillo
Referencias:
Lugar: San Miguel de Tucumán; Año: 2008 vol. 20 p. 38 - 39
ISSN:
0567-7513
Resumen:
Abstract. Comparative analysis of greisens
associated to SN-W deposits in sierra de
Fiambalá and sierra de Mazán, Catamarca
and La Rioja provinces, Argentina. In Sierra
de Fiambalá and Sierra de Mazán exist tin
and tungsten deposits associated to evolved
granites of paleozoic age. In this contribution
a comparative analysis of the greisen associated
to that mineralization is carried out. In the
southeast sector of Sierra de Fiambalá El Salto
and Ayacucho granitic stocks intrude ordovicic
amphibolites. In the western edge of Sierra de
Fiambalá Los Ratones granite intrudes the
metamorphic basement of Precambrian-Eocambrian
age. In the north sector of Sierra de
Mazán La Quebrada granite crops out in ordovicic
granitic rocks. In studied greisen were
defined the following mineral assemblages:
Los Ratones: quartz-mica; topaz-mica; sericite-
quartz. El Salto: clorite - sericite - fluorite -
topaz - quartz. Ayacucho: zinnwaldite-quartz.
La Quebrada: quartz-muscovite-tourmaline;
muscovite-quartz - tourmaline-topaz. These
different assemblages would indicate that in
the tin-tungten deposits of Sierra de Fiambalá
greisen systems were rich in fluorine, while in
Sierra de Mazán it was a mixed system rich
in fluorine and boron.
