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Abstract:

Granitoid and volcanic rocks of the Cordillera Neuquina between 38°45′ and 39°30′ south latitude have been metamorphosed under zeolite, prehnite-pumpellyite, and transitional greenschist facies conditions. This low-grade metamorphism is related to the circulation of hydrothermal solutions associated with Tertiary(?) subvolcanic bodies and/or shallow intrusives through a pre-existing fracture system. Three progressive metamorphic zones have been established, with temperatures ranging from 100° to 300°C and pressures less than 4 kb. The pressures are similar to those estimated for metamorphic rocks at Taringatura, New Zealand, and in the Tanzawa Mountains of Japan. The mineral assemblages are influenced by host-rock composition. In the granitoids, the sequence is: Zone I - heulandite, stilbite, K-feldspar, albite, quartz, calcite; Zone II - chlorite, prehnite, pumpellyite, albite, K-feldspar, titanite, quartz; and Zone III - chlorite, pistacite, piedmontite, titanite, actinolite, K-feldspar, albite, quartz, calcite. In the basalts, the sequence is: Zone I - heulandite, stilbite, calcite; Zone II - analcime, thomsonite, laumontite, natrolite, celadonite, albite; and Zone III - chlorite, pistacite, actinolite, pumpellyite, laumontite, albite, quartz. In the andesites, the sequence is: Zone I - stilbite, calcite, quartz; Zone II - pumpellyite, chlorite, titanite, celadonite, albite, quartz, calcite; and in Zone III - pistacite, quartz, chlorite, albite. Pyrite, chalcopyrite, arsenopyrite, and copper are always found in association with quartz and epidote in Zone III. © 1991.

Registro:

Documento: Artículo
Título:Low-grade metamorphism in granitoids and volcanic rocks, Cordillera Neuquina, Argentina
Autor:Vattuone de Ponti, M.E.; Latorre, C.O.
Filiación:CONICET, Facultad de Clencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Nuñez, CP 1428 Buenos Aires, Argentina
Palabras clave:granitoid; greenschist facies; metamorphism; prehnite; pumpellyite; volcanic rock; zeolite; Argentina, Cordillera Neuquina
Año:1990
Volumen:3
Número:4
Página de inicio:247
Página de fin:252
DOI: http://dx.doi.org/10.1016/0895-9811(90)90006-M
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v3_n4_p247_VattuonedePonti

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Citas:

---------- APA ----------
Vattuone de Ponti, M.E. & Latorre, C.O. (1990) . Low-grade metamorphism in granitoids and volcanic rocks, Cordillera Neuquina, Argentina. Journal of South American Earth Sciences, 3(4), 247-252.
http://dx.doi.org/10.1016/0895-9811(90)90006-M
---------- CHICAGO ----------
Vattuone de Ponti, M.E., Latorre, C.O. "Low-grade metamorphism in granitoids and volcanic rocks, Cordillera Neuquina, Argentina" . Journal of South American Earth Sciences 3, no. 4 (1990) : 247-252.
http://dx.doi.org/10.1016/0895-9811(90)90006-M
---------- MLA ----------
Vattuone de Ponti, M.E., Latorre, C.O. "Low-grade metamorphism in granitoids and volcanic rocks, Cordillera Neuquina, Argentina" . Journal of South American Earth Sciences, vol. 3, no. 4, 1990, pp. 247-252.
http://dx.doi.org/10.1016/0895-9811(90)90006-M
---------- VANCOUVER ----------
Vattuone de Ponti, M.E., Latorre, C.O. Low-grade metamorphism in granitoids and volcanic rocks, Cordillera Neuquina, Argentina. J. South Am. Earth Sci. 1990;3(4):247-252.
http://dx.doi.org/10.1016/0895-9811(90)90006-M