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Abstract:

Using a combination of morphological, optical and microprobe data, thermal analyses and XRD, a sequence of calcic zeolites and a progressive sequence of mafic phyllosilicates from smectite to mixed-layer smectite/chlorite have been identified in metavolcanic rocks affected by low grade hydrothermal metamorphism in Paso del Córdoba, Neuquén. The zeolites are: laumontite, yugawaralite, wairakite, heulandite, stilbite, stellerite and chabazite. Some of these calcic zeolites are characteristic of a high geothermal gradient hydrothermal metamorphism. The alteration of the andesitic and basaltic host rocks may cause the release of Ca, Mg and Fe ions to the interstitial solution from which Ca zeolites and mafic phyllosilicates were precipitated. High activities of Ca and reduced PCO2 operated in favour of the formation of calcic zeolites without interfering with the formation of phyllosilicates. The phyllosilicates are: 1)Mixtures of di- and trioctahedral smectites that predominate below temperatures of aproximately 200° C and 2) trioctahedral smectites and mixed layer chlorite/smectite of high temperature (>200° C) origin. Analytical electron microscope data shows that prograde changes in composition produced loss of Ca, Si and Fe. Contents of AlIV increase systematically with temperature from smectite to chlorite/smectite. The highest metamorphic temperatures, of about 250° C/260° C were reached in the meta-andesites near the Río Córdoba, as indicated by the association with laumontite, wairakite and mixed-layer chlorite/smectite. These temperatures, seem to be lower (about 200° C) in the northwest, where metabasalts with yugawaralite, wairakite, heulandite and smectites occur.

Registro:

Documento: Artículo
Título:Mineralogy of calcic zeolites and mafic phyllosilicates. characteristic of hydrothermal metamorphism in Paleogene volcanic rocks from Lago Hermoso to Río Traful, Neuquén
Autor:Vattuone De Ponti, M.E.; Latorre, C.O.; Vivian, R.; Borbolla, M.C.
Filiación:Fac. de Ciencias Exactas/Naturales, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Inst. de Geocronologia/Geol. I., Consejo Nac. de Invest. Cie./Tec., Ciudad Universitaria, 1428 Buenos Aires, Argentina
Ctro. de Invest. Tec. de Las F.A., Zufriategui 4380, Villa Martelli, 1603 Provincia de Buenos Aires, Argentina
Palabras clave:geothermal system; phyllosilicate; zeolite; Argentina, Neuquen Province
Año:1996
Volumen:51
Número:3
Página de inicio:235
Página de fin:247
Título revista:Revista de la Asociacion Geologica Argentina
Título revista abreviado:Rev. Asoc. Geol. Argent.
ISSN:00044822
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v51_n3_p235_VattuoneDePonti

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Citas:

---------- APA ----------
Vattuone De Ponti, M.E., Latorre, C.O., Vivian, R. & Borbolla, M.C. (1996) . Mineralogy of calcic zeolites and mafic phyllosilicates. characteristic of hydrothermal metamorphism in Paleogene volcanic rocks from Lago Hermoso to Río Traful, Neuquén . Revista de la Asociacion Geologica Argentina, 51(3), 235-247.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v51_n3_p235_VattuoneDePonti [ ]
---------- CHICAGO ----------
Vattuone De Ponti, M.E., Latorre, C.O., Vivian, R., Borbolla, M.C. "Mineralogy of calcic zeolites and mafic phyllosilicates. characteristic of hydrothermal metamorphism in Paleogene volcanic rocks from Lago Hermoso to Río Traful, Neuquén " . Revista de la Asociacion Geologica Argentina 51, no. 3 (1996) : 235-247.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v51_n3_p235_VattuoneDePonti [ ]
---------- MLA ----------
Vattuone De Ponti, M.E., Latorre, C.O., Vivian, R., Borbolla, M.C. "Mineralogy of calcic zeolites and mafic phyllosilicates. characteristic of hydrothermal metamorphism in Paleogene volcanic rocks from Lago Hermoso to Río Traful, Neuquén " . Revista de la Asociacion Geologica Argentina, vol. 51, no. 3, 1996, pp. 235-247.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v51_n3_p235_VattuoneDePonti [ ]
---------- VANCOUVER ----------
Vattuone De Ponti, M.E., Latorre, C.O., Vivian, R., Borbolla, M.C. Mineralogy of calcic zeolites and mafic phyllosilicates. characteristic of hydrothermal metamorphism in Paleogene volcanic rocks from Lago Hermoso to Río Traful, Neuquén . Rev. Asoc. Geol. Argent. 1996;51(3):235-247.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v51_n3_p235_VattuoneDePonti [ ]