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Date
2008
Summary
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SIGEVA
In Northern Patagonian Andes, mutinaite in assemblage with clinoptilolite in amygdales of altered Jurassic/Cretacic metabasalts was found. The zeolites were studied by optic, SEM, EDS and XRD methods. The rocks have fresh pyroxene and andesine altered to pumpellyite, in a matrix with albite, interstratified chlorite/smectite, pumpellyite and epidote. There are veins with laumontite and amygdales infilled with heulandite/clinoptilolite and mutinaite. This last mineral is white and pinky with per...
In Northern Patagonian Andes, mutinaite in assemblage with clinoptilolite in amygdales of altered Jurassic/Cretacic metabasalts was found. The zeolites were studied by optic, SEM, EDS and XRD methods. The rocks have fresh pyroxene and andesine altered to pumpellyite, in a matrix with albite, interstratified chlorite/smectite, pumpellyite and epidote. There are veins with laumontite and amygdales infilled with heulandite/clinoptilolite and mutinaite. This last mineral is white and pinky with perfect cleavage parallel to {100} and imperfect cleavage parallel to {001}. It is orthorhombic, the elongation is negative, 2Vα = 70°/80° and a0 = 19.166Å, b0 = 21.025Å, c0 = 14.558Å. Amygdales filled by mutinaite–clinoptilolite-quartz and veinlets with wairakite-laumontite suggest that their crystallization was related to low grade hydrothermal/geothermal metamorphism. The temperature of formation should be 200°C/250°C range.
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Key Words
ZEOLITE ASSEMBLAGESMUTINAITEPATAGONIAN