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dc.contributor.author
Mulcahy, Sean R.
dc.contributor.author
Roeske, Sarah M.
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McClelland, William C.
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Ellis, Joshua R.
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Jourdan, Fred
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Renne, Paul R.
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Vervoort, Jeffrey D.
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Vujovich, Graciela Irene
dc.date.available
2017-12-01T16:02:36Z
dc.date.issued
2014-04
dc.identifier.citation
Mulcahy, Sean R.; Roeske, Sarah M.; McClelland, William C.; Ellis, Joshua R.; Jourdan, Fred; et al.; Multiple migmatite events and cooling from granulite facies metamorphism within the Famatina arc margin of northwest Argentina; American Geophysical Union; Tectonics; 33; 1; 4-2014; 1-25
dc.identifier.issn
0278-7407
dc.identifier.uri
http://hdl.handle.net/11336/29449
dc.description.abstract
The Famatina margin records an orogenic cycle of convergence, metamorphism, magmatism, and extension related to the accretion of the allochthonous Precordillera terrane. New structural, petrologic, and geochronologic data from the Loma de Las Chacras region demonstrate two distinct episodes of lower crustal migmatization. The first event preserves a counterclockwise pressure-temperature path in kyanite-K-feldspar pelitic migmatites that resulted in lower crustal migmatization via muscovite dehydration melting at ∼12 kbar and 868°C at 461 ±1.7 Ma. The shape of the pressure temperature path and timing of metamorphism are similar to those of regional midcrustal granulites and suggest pervasive Ordovician migmatization throughout the Famatina margin. One-dimensional thermal modeling coupled with regional isotopic data suggests Ordovician melts remained at temperatures above their solidus for 20–30 Ma following peak granulite facies metamorphism, throughout a time period marked by regional oblique convergence. The onset of synconvergent extension occurred only after regional migmatites cooled beneath their solidus and was synchronous with the cessation of Precordillera terrane accretion at ∼436 Ma. The second migmatite event was regionally localized and occurred at ∼700°C and 12 kbar between 411 and 407 Ma via vapor saturated melting of muscovite. Migmatization was synchronous with extension, exhumation, and strike-slip deformation that likely resulted from a change in the plate boundary configuration related to the convergence and collision of the Chilenia terrane.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Geophysical Union
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Ocloyic Deformation
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Chanic Deformation
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Cuyania
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Chilenia
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Meteorología y Ciencias Atmosféricas
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Multiple migmatite events and cooling from granulite facies metamorphism within the Famatina arc margin of northwest Argentina
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-06-19T17:27:58Z
dc.journal.volume
33
dc.journal.number
1
dc.journal.pagination
1-25
dc.journal.pais
Estados Unidos
dc.description.fil
Fil: Mulcahy, Sean R.. University of California at Berkeley; Estados Unidos
dc.description.fil
Fil: Roeske, Sarah M.. University of California at Davis; Estados Unidos
dc.description.fil
Fil: McClelland, William C.. University of Iowa; Estados Unidos
dc.description.fil
Fil: Ellis, Joshua R.. Kinross Gold Corporation; Canadá
dc.description.fil
Fil: Jourdan, Fred. Curtin University; Australia
dc.description.fil
Fil: Renne, Paul R.. University of California at Berkeley; Estados Unidos
dc.description.fil
Fil: Vervoort, Jeffrey D.. Washington State University; Estados Unidos
dc.description.fil
Fil: Vujovich, Graciela Irene. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.journal.title
Tectonics
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1002/2013TC003398
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1002/2013TC003398/abstract
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