ESTUDIO TERMOMÉTRICO DE ROCAS ÍGNEAS ÁCIDAS DEL GRUPO CHOIYOI, CENTRO-SUR DE LA PROVINCIA DE LA PAMPA

MUTTI DIANA; PIRES MONICA; MONTENEGRO TERESITA

Cordoba

Congreso; Congreso de Mineralogía, Petrología Ígnea y Metamórfica, y Metalogénesis: XIII MINMET y IV PIMMA; 2019

Asociacion Mineralogica Argentina y Comisión de Petrologia AGA

Microthermometric study of silicic igneous rocks from the Choiyoi Group, center-south of La Pampa Province. The microthermometric study has been carried out in quartz crystals from silicic igneous rocks. Inclusions are biphasic with aqueous solution and vapor bubble, with variable degree of fill. Solutions are H2O-NaCl (± KCl) with salinities between 0 and 19 wt. % eq. NaCl, occasionally with daughter crystal. Homogenization temperatures have been reached between 137 and 390°C, but mayor frequency of Th was between 290 to 350°C, with boiling evidences between 320-350ºC. The lower salinities and Th were in concordance with meteoric water mix. Variable rocks textures and physicochemical characteristics of fluids are consistent with a hydrothermal fluid of high level granites that would be responsible for some mineralization