PERSONAL DE APOYO
DAPEÑA Cristina
congresos y reuniones científicas
Título:
Datos isotópicos del depósito de sulfuros en calizas "Gualilán", provincia de San Juan, República Argentina
Autor/es:
DAPEÑA, CRISTINA; PANARELLO, HECTOR
Lugar:
Mendoza, Argentina
Reunión:
Congreso; XII Congreso Geológico Argentino y II Congreso de Exploración de Hidrocarburos; 1993
Institución organizadora:
Comisión Congreso Geológico Argentino
Resumen:
The first 34S values from pyrite, sphalerite and gypsum and
the 13C and 18O from limestones, belonging to Gualilán mines(Magnata,
Sentazón and -78 level of south pique) are presented. 34S values, ranging from 0.5? to 3.7?
vs. CDT (pyrite 2.4 to 3.7?; sphalerite 0.5 to 2.0?; gypsum 1.8 to 3.5?)
suggest magmatic hydrothermal fluids as the sulfur source. 34S values
on gypsum are similar to those of pyrite and sphalerite, indicating their
supergene origin.The applicationof isotopic geothermometers has not been possible because
of the lack of purity in the samples and the scarce number of isotope pairs
that do not allow to check if sulfides were precipitated in isotopic
equilibrium conditions.13C values, grouped around 0? show the prmary marine origin of limestones.
18O values could be
classified into two groups: one around 20? corresponding to a marine
environment and other rounding 15? indicating isotope exchange with meteoric
waters.
