Mostrar el registro sencillo del ítem
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
Autor | dc.contributor.author | Larrovere, Mariano A. | |
Autor | dc.contributor.author | Hoyos, Camilo R. de los | es_CL |
Autor | dc.contributor.author | Toselli, Alejandro J. | es_CL |
Autor | dc.contributor.author | Rossi, Juana N. | es_CL |
Autor | dc.contributor.author | Basei, Miguel A.S. | es_CL |
Autor | dc.contributor.author | Belmar Urbina, Mauricio | es_CL |
Fecha ingreso | dc.date.accessioned | 2011-06-02T18:14:53Z | |
Fecha disponible | dc.date.available | 2011-06-02T18:14:53Z | |
Fecha de publicación | dc.date.issued | 2011 | |
Cita de ítem | dc.identifier.citation | Journal of South American Earth Sciences 31 (2011) 279-297 | es_CL |
Identificador | dc.identifier.issn | 0895-9811 | |
Identificador | dc.identifier.other | doi:10.1016/j.jsames.2010.11.006 | |
Identificador | dc.identifier.uri | https://repositorio.uchile.cl/handle/2250/125459 | |
Nota general | dc.description | Artículo de publicación ISI | es_CL |
Resumen | dc.description.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. | es_CL |
Patrocinador | dc.description.sponsorship | This work was funded by CONICET Grant no. PICT 0159, ANPCyT PICT Grant no. 07-09686, and CIUNT Grant no. 26-G222. | es_CL |
Idioma | dc.language.iso | en | es_CL |
Publicador | dc.publisher | Elsevier | es_CL |
Palabras claves | dc.subject | Migmatite | es_CL |
Título | dc.title | 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 | es_CL |
Tipo de documento | dc.type | Artículo de revista |
Descargar archivo
Este ítem aparece en la(s) siguiente(s) colección(ones)
-
Artículos de revistas
Artículos de revistas