INSTITUTO DE GEOCRONOLOGIA Y GEOLOGIA ISOTOPICA
Unidad Ejecutora - UE
congresos y reuniones científicas
ZEOLITE ASSEMBLAGES IN PALEOGENE BASALTS OF MALLÍN AHOGADO, NORTHERN PATAGONIAN ANDES, NEUQUÉN, ARGENTINA
GARGIULO, FLORENCIA; MARIA ELENA VATTUONE
Congreso; 4° International FEZA Conference, Zeolites and related Materials: Trends, Targets and Challenges; 2008
French zeolite Group-Federation of European Zeolite Association (FEZA)
SUMARY Alkaline zeolite assemblage of mordenite, chabazite, heulandita, natrolite and analcime was found in amygdales and veins of basaltic rocks and their breccias at the top level of Ventana Formation. The microphenocrystals in basalts have been partially replaced by pumpellyite, albite, laumontite, chlorite/smectite mixed-layer, smectite, chalcedony, hematite and iddingsite. This assemblage indicates that the temperature reached was 200° - 260ºC. This temperature seems to be lower in cement of the breccias and amygdales where the zeolite assemblages occur. The aCO2 was variable and more important at the final stage of the crystallization sequence. The presence of hematite indicates a system with high O2.