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Abstract:

A metamorphic assemblage of very low grade metamorphism in Paleogene volcanic rocks from the Andesitic Formation, Confluencia, Nauquén Province, is studied. The protolith is basaltic and andesitic. The secondary minerals are calcic, calcosodic and sodic zeolities, Wairakite is the first zeolite to crystallize, together with other minerals like albite, adularia, pumpellyite, titanite, pectolite, pyrite, native copper, hematite, smectite and quartz in the matrix and in phenocrysts. They were followed by laumontite, yugawaralite, and sodic wairakite in the matrix and in amygdales. Later on, only in amygdales, sodic wairakite was replaced by scolecite and mesolite, whereas laumontite and yugawaralite were replaced by heulandite and calcic clinoptilolite. Then barrerite, tetranatrolite and paranatrolite replaced albite and adularia was replaced by illite. These assemblages are in accordance with a pervasive geothermal field type, very low grade metamorphism in the zeolite facies. The equilibrium assemblage wairakite-yugawaralite-albite indicates P-T conditions of <0,5kb and <220°C. At temperatures lower than 200°C in the zeolite facies heulandite group minerals, scolecite and mesolite formed replacing the first association. In a second event, at temperature lower than 150°C, barrerite, paranatrolite and tetranatrolite precipitated in joints together with stilbite and stellerite. Other process, formed analcime by replacement of barrerite. Then, an increase in XCO2 favoured the precipitation of calcite in joints. The thermal waters were neutral to slightly alkaline, the fO2 conditions were in the hematite - pyrite stability field, the PH2O/P total ratio was high and then, decrases in the joints, at the same time that XC2O was increasing; it was low during the main process. The geothermal system was heated by Early Miocene magmatic intrusions. Then, in the Late Miocene? a tensional fracturing permitted the action of new fluids. © 2005 Servicio Nacional de Geología y Minería.

Registro:

Documento: Artículo
Título:Formation of zeolitic assemblages during very low grade metamorphism of Paleogene volcanic rocks, south of Confluencia, Neuquén, Argentina
Autor:Vattuone, M.E.; Latorre, C.O.; Leal, P.R.
Filiación:Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
INGEIS, CONICET, 1428 Buenos Aires, Argentina
Palabras clave:Confluencia; Geothermal; Neuquén; Patagonia argentina; VLGM; Zeolite facies; metamorphism; Paleogene; volcanic rock; zeolite; Argentina; Neuquen; South America
Año:2001
Volumen:28
Número:2
Título revista:Revista Geologica de Chile
Título revista abreviado:Rev. Geol. Chile
ISSN:07160208
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07160208_v28_n2_p_Vattuone

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Citas:

---------- APA ----------
Vattuone, M.E., Latorre, C.O. & Leal, P.R. (2001) . Formation of zeolitic assemblages during very low grade metamorphism of Paleogene volcanic rocks, south of Confluencia, Neuquén, Argentina . Revista Geologica de Chile, 28(2).
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07160208_v28_n2_p_Vattuone [ ]
---------- CHICAGO ----------
Vattuone, M.E., Latorre, C.O., Leal, P.R. "Formation of zeolitic assemblages during very low grade metamorphism of Paleogene volcanic rocks, south of Confluencia, Neuquén, Argentina " . Revista Geologica de Chile 28, no. 2 (2001).
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07160208_v28_n2_p_Vattuone [ ]
---------- MLA ----------
Vattuone, M.E., Latorre, C.O., Leal, P.R. "Formation of zeolitic assemblages during very low grade metamorphism of Paleogene volcanic rocks, south of Confluencia, Neuquén, Argentina " . Revista Geologica de Chile, vol. 28, no. 2, 2001.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07160208_v28_n2_p_Vattuone [ ]
---------- VANCOUVER ----------
Vattuone, M.E., Latorre, C.O., Leal, P.R. Formation of zeolitic assemblages during very low grade metamorphism of Paleogene volcanic rocks, south of Confluencia, Neuquén, Argentina . Rev. Geol. Chile. 2001;28(2).
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07160208_v28_n2_p_Vattuone [ ]