Very low-grade metamorphism in volcanic rocks of Formación Ventana, San Martín de los Andes, Neuquén, Argentina

Paleocene-Eocene volcanic rocks of the Formación Ventana, near San Martín de los Andes, have been affected by very low-grade regional metamorphism under zeolite, prehnite-pumpellyite and transitional to greenschists facies conditions. The mineral assemblages commonly observed are: smectite-iddingsit...

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Autores principales: De Vattuone Ponti, M.E., Latorre, C.O.
Formato: JOUR
Materias:
Actinolite
Argentina
Epidote
Heulandite
Interstratified smectite-chlorite
Laumontite
Patagonian Andes
Pumpellyite
Smectite
Very low-grade metamorphism
Wairakite
metamorphism
Tertiary
volcanic rock
Argentina, Neuquen Province, San Martin de los Andes
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_07160208_v23_n2_p187_DeVattuonePonti
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_07160208_v23_n2_p187_DeVattuonePonti
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spelling todo:paper_07160208_v23_n2_p187_DeVattuonePonti2023-10-03T15:36:08Z Very low-grade metamorphism in volcanic rocks of Formación Ventana, San Martín de los Andes, Neuquén, Argentina De Vattuone Ponti, M.E. Latorre, C.O. Actinolite Argentina Epidote Heulandite Interstratified smectite-chlorite Laumontite Patagonian Andes Pumpellyite Smectite Very low-grade metamorphism Wairakite metamorphism Tertiary volcanic rock Argentina, Neuquen Province, San Martin de los Andes Paleocene-Eocene volcanic rocks of the Formación Ventana, near San Martín de los Andes, have been affected by very low-grade regional metamorphism under zeolite, prehnite-pumpellyite and transitional to greenschists facies conditions. The mineral assemblages commonly observed are: smectite-iddingsite-serpentine; smectite-heulandite-mordenite; wairakite-laumontite-albite; wairakite-laumontite-pumpellyite-epidote; pumpellyite-smectite-epidote-titanite: prehnite-hematite-interstratified smectite/chlorite-titanite; interstratified smectite/chlorite-epidote-actinolite-titanite-albite-quartz. Metamorphism took place under oxidizing conditions (high fO2) in the fluid fase, indicated by the stable existence of hematite, epidote (pistacite) and pumpellyite. Four progressive metamorphic zones have been established and according to the mineral assemblages, the maximum temperature could have reached 300°C and the pressures 2 kbar. Those zones are: A- smectite-heulandite: B- wairakite-laumontite; C- prehnite-pumpellyite: D- epidote-actinolite. The diagnostic minerals: heulandite, laumontite, wairakite, prehnite, pumpellyite, epidote and actinolite suggest that the metamorphic evolution took place in an area characterized by the presence of shallow igneous intrusions. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_07160208_v23_n2_p187_DeVattuonePonti
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Actinolite
Argentina
Epidote
Heulandite
Interstratified smectite-chlorite
Laumontite
Patagonian Andes
Pumpellyite
Smectite
Very low-grade metamorphism
Wairakite
metamorphism
Tertiary
volcanic rock
Argentina, Neuquen Province, San Martin de los Andes
spellingShingle Actinolite
Argentina
Epidote
Heulandite
Interstratified smectite-chlorite
Laumontite
Patagonian Andes
Pumpellyite
Smectite
Very low-grade metamorphism
Wairakite
metamorphism
Tertiary
volcanic rock
Argentina, Neuquen Province, San Martin de los Andes
De Vattuone Ponti, M.E.
Latorre, C.O.
Very low-grade metamorphism in volcanic rocks of Formación Ventana, San Martín de los Andes, Neuquén, Argentina
topic_facet Actinolite
Argentina
Epidote
Heulandite
Interstratified smectite-chlorite
Laumontite
Patagonian Andes
Pumpellyite
Smectite
Very low-grade metamorphism
Wairakite
metamorphism
Tertiary
volcanic rock
Argentina, Neuquen Province, San Martin de los Andes
description Paleocene-Eocene volcanic rocks of the Formación Ventana, near San Martín de los Andes, have been affected by very low-grade regional metamorphism under zeolite, prehnite-pumpellyite and transitional to greenschists facies conditions. The mineral assemblages commonly observed are: smectite-iddingsite-serpentine; smectite-heulandite-mordenite; wairakite-laumontite-albite; wairakite-laumontite-pumpellyite-epidote; pumpellyite-smectite-epidote-titanite: prehnite-hematite-interstratified smectite/chlorite-titanite; interstratified smectite/chlorite-epidote-actinolite-titanite-albite-quartz. Metamorphism took place under oxidizing conditions (high fO2) in the fluid fase, indicated by the stable existence of hematite, epidote (pistacite) and pumpellyite. Four progressive metamorphic zones have been established and according to the mineral assemblages, the maximum temperature could have reached 300°C and the pressures 2 kbar. Those zones are: A- smectite-heulandite: B- wairakite-laumontite; C- prehnite-pumpellyite: D- epidote-actinolite. The diagnostic minerals: heulandite, laumontite, wairakite, prehnite, pumpellyite, epidote and actinolite suggest that the metamorphic evolution took place in an area characterized by the presence of shallow igneous intrusions.
format JOUR
author De Vattuone Ponti, M.E.
Latorre, C.O.
author_facet De Vattuone Ponti, M.E.
Latorre, C.O.
author_sort De Vattuone Ponti, M.E.
title Very low-grade metamorphism in volcanic rocks of Formación Ventana, San Martín de los Andes, Neuquén, Argentina
title_short Very low-grade metamorphism in volcanic rocks of Formación Ventana, San Martín de los Andes, Neuquén, Argentina
title_full Very low-grade metamorphism in volcanic rocks of Formación Ventana, San Martín de los Andes, Neuquén, Argentina
title_fullStr Very low-grade metamorphism in volcanic rocks of Formación Ventana, San Martín de los Andes, Neuquén, Argentina
title_full_unstemmed Very low-grade metamorphism in volcanic rocks of Formación Ventana, San Martín de los Andes, Neuquén, Argentina
title_sort very low-grade metamorphism in volcanic rocks of formación ventana, san martín de los andes, neuquén, argentina
url http://hdl.handle.net/20.500.12110/paper_07160208_v23_n2_p187_DeVattuonePonti
work_keys_str_mv AT devattuonepontime verylowgrademetamorphisminvolcanicrocksofformacionventanasanmartindelosandesneuquenargentina
AT latorreco verylowgrademetamorphisminvolcanicrocksofformacionventanasanmartindelosandesneuquenargentina
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