The Palaeocene Cerro Munro tonalite intrusion (Chubut Province, Argentina): A plutonic remnant of explosive volcanism?

The Cerro Munro sub-volcanic intrusion is emplaced in the back-arc (400 km from the trench) as small sub-circular tonalite-granodiorite plutons with abundant radial porphyritic dikes. U-Pb zircon SHRIMP data give an age of crystallization of 57 Ma ± 1.4 Ma. It is located to the east of the North Pat...

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Detalles Bibliográficos
Autores principales: Rodríguez, C., Aragón, Eugenio, Castro, A., Pedreira, R., Sánchez-Navas, A., Díaz-Alvarado, J., D'Eramo, F., Pinotti, L., Aguilera, Y., Cavarozzi, Claudia Ernestina, Demartis, M., Hernando, Irene Raquel, Fuentes, Tomás Gregorio
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2017
Materias:
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/97232
https://ri.conicet.gov.ar/11336/65144
Aporte de:
id I19-R120-10915-97232
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Autoliths
Calc-alkaline magmatism
Cathodoluminiscence
Fractionation
Tonalites
spellingShingle Ciencias Naturales
Autoliths
Calc-alkaline magmatism
Cathodoluminiscence
Fractionation
Tonalites
Rodríguez, C.
Aragón, Eugenio
Castro, A.
Pedreira, R.
Sánchez-Navas, A.
Díaz-Alvarado, J.
D'Eramo, F.
Pinotti, L.
Aguilera, Y.
Cavarozzi, Claudia Ernestina
Demartis, M.
Hernando, Irene Raquel
Fuentes, Tomás Gregorio
The Palaeocene Cerro Munro tonalite intrusion (Chubut Province, Argentina): A plutonic remnant of explosive volcanism?
topic_facet Ciencias Naturales
Autoliths
Calc-alkaline magmatism
Cathodoluminiscence
Fractionation
Tonalites
description The Cerro Munro sub-volcanic intrusion is emplaced in the back-arc (400 km from the trench) as small sub-circular tonalite-granodiorite plutons with abundant radial porphyritic dikes. U-Pb zircon SHRIMP data give an age of crystallization of 57 Ma ± 1.4 Ma. It is located to the east of the North Patagonian Batholith (NPB) that shows a protracted and episodic magmatic history from Cretaceous to Miocene time. The NPB Palaeogene episode is characterized by the lack of magmatic activity at the arc axis, as small plutonic emplacements move to the fore-arc and back-arc. This Palaeogene tectono-magmatic episode is ruled by the detachment of the Aluk plate during the Aluk-Farallon-SAM triple junction, active at that time along northern Patagonia active margin, changing the Cretaceous ?NPB orogenic? setting to a Palaeogene ?Munro transitional? tectono-magmatic setting. Near the contacts, the tonalite contains abundant enclaves of igneous appearance and variable size from several cm to dm, described as autoliths. The study of autoliths and host tonalite reveals interesting results on the processes of fractionation in a thermally zoned magma chamber. Autoliths, and in a large extent the host tonalite, represent disguised cumulates from which a hydrous silicic liquid was extracted. Barometry calculations from mineral chemistry in both autoliths and tonalites record a shallow pressure of emplacement of 0.5 kbar. Rhyolite-dacite flows and ignimbrites, surrounding the northern contact of the Cerro Munro tonalite, may represent the exsolved liquid from the plutonic cumulates. The study by cathodoluminiscence and electron backscattered diffraction techniques from a rhyolite-hosted quartz supports this protracted history of the Cerro Munro magma chamber.
format Articulo
Preprint
author Rodríguez, C.
Aragón, Eugenio
Castro, A.
Pedreira, R.
Sánchez-Navas, A.
Díaz-Alvarado, J.
D'Eramo, F.
Pinotti, L.
Aguilera, Y.
Cavarozzi, Claudia Ernestina
Demartis, M.
Hernando, Irene Raquel
Fuentes, Tomás Gregorio
author_facet Rodríguez, C.
Aragón, Eugenio
Castro, A.
Pedreira, R.
Sánchez-Navas, A.
Díaz-Alvarado, J.
D'Eramo, F.
Pinotti, L.
Aguilera, Y.
Cavarozzi, Claudia Ernestina
Demartis, M.
Hernando, Irene Raquel
Fuentes, Tomás Gregorio
author_sort Rodríguez, C.
title The Palaeocene Cerro Munro tonalite intrusion (Chubut Province, Argentina): A plutonic remnant of explosive volcanism?
title_short The Palaeocene Cerro Munro tonalite intrusion (Chubut Province, Argentina): A plutonic remnant of explosive volcanism?
title_full The Palaeocene Cerro Munro tonalite intrusion (Chubut Province, Argentina): A plutonic remnant of explosive volcanism?
title_fullStr The Palaeocene Cerro Munro tonalite intrusion (Chubut Province, Argentina): A plutonic remnant of explosive volcanism?
title_full_unstemmed The Palaeocene Cerro Munro tonalite intrusion (Chubut Province, Argentina): A plutonic remnant of explosive volcanism?
title_sort palaeocene cerro munro tonalite intrusion (chubut province, argentina): a plutonic remnant of explosive volcanism?
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/97232
https://ri.conicet.gov.ar/11336/65144
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