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Abstract:

Meta-supracrustal migmatitic packages in the Sierras Valle Fértil-La Huerta of northwestern Argentina occur as wedge- or strip-shaped septa interlayered among mafic to intermediate igneous plutonic rocks. Meta-supracrustal rocks were metamorphosed under granulite-facies conditions during the development of the Famatinian magmatic arc, and are among the structurally deepest rocks exposed within the belt dominated by Ordovician plutonism. Petrographic analysis, mineral chemistry and whole rock geochemistry of granulite-facies migmatites are used to argue that the meta-supracrustal packages comprise a sequence of pelitic to quartzo-feldspathic sedimentary rocks that achieved peak metamorphic P-T conditions of 5.2-7.1 kbar and 770-840 °C. There are no resolvable differences in peak P-T conditions for migmatites separated 70 km along strike of the Sierras Valle Fértil and La Huerta, suggesting that similar levels of the Famatinian paleo-arc crust are currently exposed in these ranges. Idioblastic poikilitic garnets displaying weak to absent chemical zoning profiles developed at or close to the peak metamorphic stage are used in conjunction with petrogenetic grid constraints to interpret the prograde evolution. At the time the supracrustal rocks experienced maximum thermal conditions, they underwent dehydration partial melting. Microtextural features show that felsic melt (leucosome) back reacted with the adjacent coexisting mineral assemblage (mesosome). These observations are interpreted as evidence that the migmatites evolved through a continuous heating-cooling cycle with minor pressure change. This is consistent with the general lack of reaction textures denoting decompression at high temperatures, and with the possibility that in some migmatites retrograde reactions formed staurolite. Collectively, these features indicate that when the migmatites attained peak thermal conditions, the deepest exposed arc crust was about 20-25 km beneath the Ordovician surface. Comparing these results with metamorphic studies elsewhere in the Famatinian arc between 31° and 32°S. indicates that much of the main-arc records primarily prograde P-T trajectories associated with a regional contact metamorphism, but that specific locations in the back-arc, main-arc and accretionary wedge also record post-peak retrogression during crustal exhumation. These differences are attributed to the fact that a collisional orogeny closely followed the cessation of arc magmatism, a collision we infer to be associated with the accretion of a Laurentian terrane to the Gondwana margin. The results of this study therefore provide important insights into the geodynamic context of the formation and closure of the central segment of the Famatinian magmatic arc. © 2007 Elsevier Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Metamorphic evolution of migmatites from the deep Famatinian arc crust exposed in Sierras Valle Fértil-La Huerta, San Juan, Argentina
Autor:Otamendi, J.E.; Tibaldi, A.M.; Vujovich, G.I.; Viñao, G.A.
Filiación:Departamento de Geología, Universidad Nacional de Río Cuarto, 5800 Río Cuarto, Argentina
Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, 1428 Buenos Aires, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina
Palabras clave:Famatinian arc; Geothermobarometry; Metamorphism; Migmatite; Sierras Pampeanas; metamorphism; migmatite; orogeny; P-T conditions; petrography; supracrustal rock; tectonic evolution; Argentina; Sierras Pampeanas; South America
Año:2008
Volumen:25
Número:3
Página de inicio:313
Página de fin:335
DOI: http://dx.doi.org/10.1016/j.jsames.2007.09.001
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v25_n3_p313_Otamendi

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Citas:

---------- APA ----------
Otamendi, J.E., Tibaldi, A.M., Vujovich, G.I. & Viñao, G.A. (2008) . Metamorphic evolution of migmatites from the deep Famatinian arc crust exposed in Sierras Valle Fértil-La Huerta, San Juan, Argentina. Journal of South American Earth Sciences, 25(3), 313-335.
http://dx.doi.org/10.1016/j.jsames.2007.09.001
---------- CHICAGO ----------
Otamendi, J.E., Tibaldi, A.M., Vujovich, G.I., Viñao, G.A. "Metamorphic evolution of migmatites from the deep Famatinian arc crust exposed in Sierras Valle Fértil-La Huerta, San Juan, Argentina" . Journal of South American Earth Sciences 25, no. 3 (2008) : 313-335.
http://dx.doi.org/10.1016/j.jsames.2007.09.001
---------- MLA ----------
Otamendi, J.E., Tibaldi, A.M., Vujovich, G.I., Viñao, G.A. "Metamorphic evolution of migmatites from the deep Famatinian arc crust exposed in Sierras Valle Fértil-La Huerta, San Juan, Argentina" . Journal of South American Earth Sciences, vol. 25, no. 3, 2008, pp. 313-335.
http://dx.doi.org/10.1016/j.jsames.2007.09.001
---------- VANCOUVER ----------
Otamendi, J.E., Tibaldi, A.M., Vujovich, G.I., Viñao, G.A. Metamorphic evolution of migmatites from the deep Famatinian arc crust exposed in Sierras Valle Fértil-La Huerta, San Juan, Argentina. J. South Am. Earth Sci. 2008;25(3):313-335.
http://dx.doi.org/10.1016/j.jsames.2007.09.001