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dc.contributor.author
Tibaldi, Alina María
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dc.contributor.author
Otamendi, Juan Enrique
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dc.contributor.author
Cristofolini, Eber Ariel
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dc.contributor.author
Baliani, Ignacio
dc.contributor.author
Walker, Barry A.
dc.contributor.author
Bergantz, George W.
dc.date.available
2017-09-04T20:12:39Z
dc.date.issued
2013-01
dc.identifier.citation
Tibaldi, Alina María; Otamendi, Juan Enrique; Cristofolini, Eber Ariel; Baliani, Ignacio; Walker, Barry A. ; et al.; Reconstruction of the Early Ordovician Famatinian arc through thermobarometry in lower and middle crustal exposures, Sierra de Valle Fértil, Argentina; Elsevier Science; Tectonophysics; 589; 1-2013; 151-166
dc.identifier.issn
0040-1951
dc.identifier.uri
http://hdl.handle.net/11336/23622
dc.description.abstract
The crustal structure of the Famatinian paleoarc is reconstructed by determining the metamorphic crystallization P–T conditions from metasedimentary rocks at various structural levels in the Valle Fértil section. The bulk section exhibits a 15-km-thick arc crustal section. Thermobarometry shows that nested tonalitic and granodioritic plutons constructed the arc crust at depths < 20 km. Dioritic and tonalitic bodies dominated between 20 and 25 km. The deepest exposed paleodepths are formed by cumulate and non-cumulate gabbroic rocks with interlayered quartz diorites that crystallized below 25 km. The boundary between the crust and the lithospheric mantle is not observed and would have been underneath a depth of 27 km. P–T estimates throughout the section reveals high geothermal gradients ranging from 25 °C/km to 35 °C/km. The thermal regime inferred for middle crustal levels is observed in active and ancient magmatic arcs. Thermophysical models predicting the array of retrieved P–T estimates require heat advection conducted by mafic magmas which either emplaced in the lower crust and/or intruded into middle crustal levels. Calculated seismic wave velocities of plutonic rocks dominating progressively deeper paleodepths are used to deduce the internal architecture of the Valle Fértil section. This result indicates that the Famatinian arc had a middle crustal structure very similar to that of the ancient Talkeetna arc; however a rapid increase of seismic wave velocities from ~ 6.3 km/s to > 6.6 km/s is located at deeper depths in the Famatinian arc than in Talkeetna arc. The thickness of a crustal layer dominated by plutonic rocks with low seismic wave velocities (< 6.2 km/s) is 10 km thinner than the crustal layer with similar physical properties in the Sierra Nevada batholith. A putative model for the whole Famatinian arc suggests a total crustal thickness between 30 and 35 km with three distinct layers.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
Paleoarcs
dc.subject
Thermometry
dc.subject
Subduction Zones
dc.subject
Famatinian Arc
dc.subject.classification
Oceanografía, Hidrología, Recursos Hídricos
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Reconstruction of the Early Ordovician Famatinian arc through thermobarometry in lower and middle crustal exposures, Sierra de Valle Fértil, 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
2017-09-04T14:27:16Z
dc.journal.volume
589
dc.journal.pagination
151-166
dc.journal.pais
Países Bajos
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dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Tibaldi, Alina María. Universidad Nacional de Río Cuarto; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Otamendi, Juan Enrique. Universidad Nacional de Río Cuarto; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Cristofolini, Eber Ariel. Universidad Nacional de Río Cuarto; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Baliani, Ignacio. Universidad Nacional de Río Cuarto; Argentina
dc.description.fil
Fil: Walker, Barry A.. University of Washington; Estados Unidos
dc.description.fil
Fil: Bergantz, George W.. University of Washington; Estados Unidos
dc.journal.title
Tectonophysics
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.tecto.2012.12.032
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0040195113000140
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