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High T/P evolution and metamorphic ages of the migmatitic basement of northern Sierras Pampeanas, Argentina: Characterization of a mid-crustal segment of the Famatinian belt

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2011
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Larrovere, Mariano A.
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High T/P evolution and metamorphic ages of the migmatitic basement of northern Sierras Pampeanas, Argentina: Characterization of a mid-crustal segment of the Famatinian belt
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  • Larrovere, Mariano A.;
  • Hoyos, Camilo R. de los;
  • Toselli, Alejandro J.;
  • Rossi, Juana N.;
  • Basei, Miguel A.S.;
  • Belmar Urbina, Mauricio;
Abstract
New petrologic, thermobarometric and U-Pb monazite geochronologic information allowed to resolve the metamorphic evolution of a high temperature mid-crustal segment of an ancient subduction-related orogen. The El Portezuelo Metamorphic-Igneous Complex, in the northern Sierras Pampeanas, is mainly composed of migmatites that evolved from amphibolite to granulite metamorphic facies, reaching thermal peak conditions of 670e820 C and 4.5e5.3 kbar. The petrographic study combined with conventional and pseudosection thermobarometry led to deducing a short prograde metamorphic evolution within migmatite blocks. The garnet-absent migmatites represent amphibolite-facies rocks, whereas the cordierite-garnet-K-feldspar-sillimanite migmatites represent higher metamorphic grade rocks. U-Pb geochronology on monazite grains within leucosome record the time of migmatization between z477 and 470 Ma. Thus, the El Portezuelo Metamorphic-Igneous Complex is an example of exhumed Early Ordovician anatectic middle crust of the Famatinian mobile belt. Homogeneous exposure of similar paleo-depths throughout the Famatinian back-arc and isobaric cooling paths suggest slow exhumation and consequent longstanding crustal residence at high temperatures. High thermal gradients uniformly distributed in the Famatinian back-arc can be explained by shallow convection of a lowviscosity asthenosphere promoted by subducting-slab dehydration.
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This work was funded by CONICET Grant no. PICT 0159, ANPCyT PICT Grant no. 07-09686, and CIUNT Grant no. 26-G222.
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URI: https://repositorio.uchile.cl/handle/2250/125459
DOI: doi:10.1016/j.jsames.2010.11.006
ISSN: 0895-9811
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Journal of South American Earth Sciences 31 (2011) 279-297
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