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dc.contributor.author
Finch, Melanie A.
dc.contributor.author
Ferrez Weinberg, Roberto
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Hasalová, Pavlína
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Becchio, Raul Alberto
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Fuentes, María Gabriela
dc.contributor.author
Kennedy, Allen
dc.date.available
2018-04-05T18:12:26Z
dc.date.issued
2017-06
dc.identifier.citation
Finch, Melanie A.; Ferrez Weinberg, Roberto; Hasalová, Pavlína; Becchio, Raul Alberto; Fuentes, María Gabriela; et al.; Tectono-metamorphic evolution of a convergent back-arc: The Famatinian orogen, Sierra de Quilmes, Sierras Pampeanas, NW Argentina; Geological Society of America; Geological Society Of America Bulletin; 129; 11-12; 6-2017; 1602-1621
dc.identifier.issn
0016-7606
dc.identifier.uri
http://hdl.handle.net/11336/40941
dc.description.abstract
Back-arcs are hot regions of enduring weakness in the hinterland of subduction zones that are commonly sites of strain localization, forming mobile belts that, in some cases, develop into mountain belts. Their evolution results from their strength, a function of thickness, heat flux, and stresses. Contractional back-arcs may be too weak to form thick crusts, whereas in other cases, they can thicken considerably and lead to mountain building. The stress and thermal histories of back-arcs can be retrieved from investigation of the relationships between deformation and metamorphism. The 490−430 Ma Famatinian orogen of the Sierras Pampeanas is associated with a back-arc that has a complex development. We focus on the Sierra de Quilmes within the northern section of the back-arc and present new structural data tied to anatexis and constrained by geochronology. We find that low-pressure−high-temperature conditions prevailed over an ∼35 m.y. thermal peak between 497 and 461 Ma, as indicated by U/Pb ages of monazite. Anatexis coincided with thrusting to the west and northwest, as evidenced by leucosomes in axial planes of folds and in thrust planes. As rocks were thrust upward, they cooled, melt solidified, and deformation localized into two major thrust zones. These record the same thrust-to-the-west or northwest kinematics as the earlier syn-anatectic deformation and ultimately placed hot rocks over cold ones. Continuous thrusting during cooling from peak metamorphism, accompanied by strain localization, is consistent with a number of shear zones in the northern Sierras Pampeanas. The low-pressure metamorphic assemblages indicate that shortening was not accompanied by pronounced crustal thickening, suggesting that the lithosphere was too hot, and the partially melted crust was too weak for substantial stacking.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Geological Society of America
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Famatinian Orogen
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Metamorphism
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Deformation
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Partial Melt
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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
Tectono-metamorphic evolution of a convergent back-arc: The Famatinian orogen, Sierra de Quilmes, Sierras Pampeanas, NW 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
2018-04-05T13:46:19Z
dc.journal.volume
129
dc.journal.number
11-12
dc.journal.pagination
1602-1621
dc.journal.pais
Estados Unidos
dc.description.fil
Fil: Finch, Melanie A.. Monash University; Australia
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Fil: Ferrez Weinberg, Roberto. Monash University; Australia
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Fil: Hasalová, Pavlína. Czech Geological Survey; República Checa
dc.description.fil
Fil: Becchio, Raul Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones en Energía no Convencional. Universidad Nacional de Salta. Facultad de Ciencias Exactas. Departamento de Física. Instituto de Investigaciones en Energía no Convencional; Argentina
dc.description.fil
Fil: Fuentes, María Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones en Energía no Convencional. Universidad Nacional de Salta. Facultad de Ciencias Exactas. Departamento de Física. Instituto de Investigaciones en Energía no Convencional; Argentina
dc.description.fil
Fil: Kennedy, Allen. Curtin University; Australia
dc.journal.title
Geological Society Of America Bulletin
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1130/B31620.1
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/gsa/gsabulletin/article/doi/10.1130/B31620.1/208077/Tectonometamorphic-evolution-of-a-convergent


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