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Gómez Barreiro, Juan ; Wijbrans, Jan R. ; Castiñeiras García, Pedro ; Martínez Catalán, José R. ; Arenas Martín, Ricardo ; Díaz García, Florentino ; Abati Gómez, Jacobo | Geological Society of London. | 2006The tectonothermal evolution of a polyorogenic terrane in the Variscan belt of NW Spain has been constrained by 40Ar/39Ar laserprobe incremental heating experiments on mylonitic fabrics developed in major structures. Transitional levels between [...]texto impreso
Eramo, Fabiana d' ; Pinotti, Lucio Pedro ; Tubia, José María ; Vegas, Néstor ; Aranguren, Aitor ; Tejero López, Rosa ; Gómez, Daniel O. | Geological Society of London. | 2006This study deals with the structure of the El Hongo trondhjemite, a ENE–WSW elongate pluton belonging to the Famatinian magmatic arc that developed from Late Cambrian to Silurian times in the Sierras Pampeanas (Argentina). Anisotropy of magnetic[...]texto impreso
Fernández Suárez, Javier ; Gutiérrez Alonso, Gabriel ; Jenner, G.A. ; Tubrett, M.N. | Geological Society of London. | 1999Detrital zircons from greywackes belonging to an Ordovician volcanosedimentary–igneous complex in NW Spain were dated using the laser ablation-inductively coupled plasma-mass spectrometry technique. U–Pb results indicate the existence of three P[...]texto impreso
Casquet, César ; Pankhurst, R.J. ; Rapela, Carlos W. ; Galindo Francisco, Mª del Carmen ; Dahlquist, Juan A. ; Baldo, Edgardo G. ; Saavedra, Julio ; González Casado, José Manuel ; Fanning, C.M. | Geological Society of London. | 2004-01We report the discovery of massif-type anorthosites in the Andean basement of the Western Sierras Pampeanas of Argentina. U–Pb zircon dating (by sensitive high-resolution ion microprobe) of a cogenetic gabbronorite dyke yields ages of 1070 ± 41 [...]texto impreso
Sánchez Martínez, Sonia ; Arenas Martín, Ricardo ; Gerdex, Axel ; Castiñeiras García, Pedro ; Potrel, Alain ; Fernández Suárez, Javier | Geological Society of London. | 2011In the Purrido Ophiolite (Cabo Ortegal Complex), new U–Pb zircon dating of the amphibolite G03-8 (by laser ablation inductively coupled plasma mass spectrometry) confirms the existence of a dominant Mesoproterozoic zircon population with a refin[...]texto impreso
Fanning, C.M. ; Pankhurst, R.J. ; Rapela, Carlos W. ; Baldo, Edgardo G. ; Casquet, César ; Galindo Francisco, Mª del Carmen | Geological Society of London. | 2004New U–Pb radiometric dates for K-bentonite horizons within the Lower Cambrian to Middle Ordovician platform carbonates from the Precordillera terrane of NWArgentina provide further constraints on models for the allochthonous or parautochthonous [...]texto impreso
Luque del Villar, Francisco Javier ; Ortega Menor, Lorena ; Fernández Barrenechea, José María ; Huizenga, Jan-Marten ; Millward, David | Geological Society of London. | 2012Massive graphite deposition resulting in volumetrically large occurrences in volcanic environments is usually hindered by the low carbon contents of magmas and by the degassing processes occurring during and after magma emplacement. In spite of [...]texto impreso
Verdecchia, Sebastián ; Casquet, César ; Baldo, Edgardo G. ; Pankhurst, R.J. ; Rapela, Carlos W. ; Fanning, C.M. ; Galindo Francisco, Mª del Carmen | Geological Society of London. | 2011The Early Palaeozoic stratigraphy and tectonic history of the Eastern Sierras Pampeanas of central Argentina are complicated by metamorphism and deformation resulting from the Pampean (545–510 Ma) and Famatinian (490–440 Ma) orogenies. We report[...]texto impreso
A pre-Rodinian ophiolite involved in the Variscan suture of Galicia (Cabo Ortegal Complex, NW Spain)
Sánchez Martínez, Sonia ; Jeffries, Teresa E. ; Arenas Martín, Ricardo ; Fernández Suárez, Javier ; García Sánchez, Raquel | Geological Society of London. | 2006U–Pb dating of zircons from a metagabbro of the Purrido amphibolitic unit (Cabo Ortegal Complex, NW Iberian Massif) yielded an age of 1159 ± 39 Ma, interpreted to approximate the crystallization age of the gabbroic protolith. Considering the arc[...]texto impreso
Gutiérrez Alonso, Gabriel ; Fernández Suárez, Javier ; Pastor Galán, D. ; Johnston, S. T. ; Linnemann, U. ; Hofmann, M. ; Shaw, J. ; Colmenero, J. R. ; Hernández, P. | Geological Society of London. | 2015Seven samples of Siluro-Devonian sedimentary rocks from the Cantabrian and Central Iberian zones of the Iberian Variscan belt have been investigated for provenance and contain four main age populations in variable relative proportion: Ediacaran–[...]texto impreso
Pankhurst, Robert J. ; Rapela, Carlos W. ; López de Luchi, M.G. ; Rapalini, A.E. ; Fanning, C.M. ; Galindo Francisco, María del Carmen | Geological Society of London. | 2014A multidisciplinary study (U–Pb sensitive high-resolution ion microprobe geochronology, Hf and O isotopes in zircon, Sr and Nd isotopes in whole-rocks, as well as major and trace element geochemistry) has been carried out on granitoid samples fr[...]texto impreso
Romeo Briones, Ignacio ; Lunar Hernández, Rosario ; Capote del Villar, Ramón ; Quesada Ochoa, Cecilio ; Dunning, Gregory R. ; Piña García, Rubén ; Ortega Menor, Lorena | Geological Society of London. | 2006New U–Pb zircon ages from the Santa Olalla Igneous Complex have been obtained, which improve the knowledge of the precise timing of Variscan magmatism in the Ossa–Morena Zone, SW Iberia. This complex has a special relevance as it hosts the most [...]texto impreso
Díez Fernández, Rubén ; Martínez Catalán, José Ramón ; Arenas Martín, Ricardo ; Abati Gómez, Jacobo ; Gerdex, Axel ; Fernández Suárez, Javier | Geological Society of London. | 2012Detrital U–Pb laser ablation inductively coupled plasma mass spectrometry zircon ages from six siliciclastic samples from the lower allochthon of NW Iberia are analysed to constrain their maximum sedimentation age and provenance, and to evaluate[...]texto impreso
Gómez Barreiro, Juan ; Martínez Catalán, José Ramón ; Díez Fernández, Rubén ; Arenas Martín, Ricardo ; Díaz García, Florentino | Geological Society of London. | 2010The kinematics of the basal allochthon in the SW of the O´ rdenes Complex is analysed to constraint its evolution during collisional and postcollisional stages of the Variscan orogeny. Two distinct sequences have been identified in the basal all[...]texto impreso
Aguilar, Carmen ; Liesa Torre Marín, Montserrat ; Castiñeiras García, Pedro ; Navidad Fernández de la Cruz, Marina | Geological Society of London. | 2014-03Variscan migmatites cropping out in the eastern Pyrenees were dated together with Late Variscan plutonic rocks. Upper Proterozoic–Lower Cambrian series were migmatized during a thermal episode that occurred in the interval 320–315 Ma coeval with[...]
