dc.creator | Larrovere, Mariano Alexis | |
dc.creator | de Los Hoyos, Camilo Raul | |
dc.creator | Toselli, Alejandro Jose | |
dc.creator | Rossi, Juana Norma | |
dc.creator | Stipp Basei, Miguel Angelo | |
dc.creator | Belmar, Mauricio E. | |
dc.date.accessioned | 2021-12-06T19:15:42Z | |
dc.date.accessioned | 2022-10-15T05:44:21Z | |
dc.date.available | 2021-12-06T19:15:42Z | |
dc.date.available | 2022-10-15T05:44:21Z | |
dc.date.created | 2021-12-06T19:15:42Z | |
dc.date.issued | 2011-03 | |
dc.identifier | Larrovere, Mariano Alexis; de Los Hoyos, Camilo Raul; Toselli, Alejandro Jose; Rossi, Juana Norma; Stipp Basei, Miguel Angelo; et al.; 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; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 31; 2-3; 3-2011; 279-297 | |
dc.identifier | 0895-9811 | |
dc.identifier | http://hdl.handle.net/11336/148327 | |
dc.identifier | 1873-0647 | |
dc.identifier | CONICET Digital | |
dc.identifier | CONICET | |
dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/4351237 | |
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 670-820 °C and 4.5-5.3 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 ≈477 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 low-viscosity asthenosphere promoted by subducting-slab dehydration. | |
dc.language | eng | |
dc.publisher | Pergamon-Elsevier Science Ltd | |
dc.relation | info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jsames.2010.11.006 | |
dc.relation | info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981111000071 | |
dc.rights | https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ | |
dc.rights | info:eu-repo/semantics/restrictedAccess | |
dc.subject | FAMATINIAN OROGENIC BELT | |
dc.subject | GEOCHRONOLOGY | |
dc.subject | GEOTHERMOBAROMETRY | |
dc.subject | METAMORPHISM | |
dc.subject | MIGMATITE | |
dc.subject | SIERRAS PAMPEANAS | |
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 | |
dc.type | info:eu-repo/semantics/article | |
dc.type | info:ar-repo/semantics/artículo | |
dc.type | info:eu-repo/semantics/publishedVersion | |