Resultados globales: 6 registros encontrados en 0.03 segundos.
Artículos, Encontrados 6 registros
Artículos Encontrados 6 registros  
1.
17 p, 7.5 MB Age of the basement beneath the Mesozoic Lusitanian Basin revealed by granitic xenoliths from the Papôa volcanic breccia (West Iberia) / Pereira, M. F. (Universidade de Évora. Instituto de Ciências da Terra) ; Gama, C. (Universidade de Évora. Instituto de Ciências da Terra) ; Silva, J. B. (Universidade de Lisboa. Departamento de Geologia) ; Dias da Silva, Í. (Universidade de Lisboa. Departamento de Geologia)
The dyke of the Papôa volcanic breccia cross-cutting the Lower Jurassic sequence of the Lusitanian Basin (West Iberia) contains granitic xenoliths. In this study, for the first time, U-Th-Pb zircon analysis of two xenoliths yielded 298 ± 4 Ma for biotite granite and of 292 ± 2 Ma for two-mica granite, indicating that the pre-Mesozoic basement of the Lusitanian Basin includes Permian intrusions. [...]
2020 - 10.1344/GeologicaActa2020.18.16
Geologica acta, Vol. 18 (2020) , p. 1-19 (Articles)  
2.
14 p, 6.1 MB Zircon and allanite U-Pb ID-TIMS ages of vaugnerites from the Calzadilla pluton, Salamanca (Spain) : dating mantle-derived magmatism and post-magmatic subsolidus overprint / López-Moro, Francisco Javier (Universidad de Salamanca. Departamento de Geología) ; Romer, R. L. (Deutsches GeoForschungsZentrum (GFZ)) ; López-Plaza, Miguel (Universidad de Salamanca. Departamento de Geología) ; Gónzalez Sánchez, M. (Instituto de Recursos Naturales y Agrobiología de Salamanca)
Basic to intermediate high-K, high-Mg mantle-derived rocks occur throughout the Iberian Massif and are particularly important in the Tormes Dome, where vaugnerites form several stocks and small plutons. [...]
2017 - 10.1344/GeologicaActa2017.15.4.9
Geologica acta, Vol. 15 Núm. 4 (December 2017) , p. 395-408  
3.
9 p, 388.3 KB Is there a Grenvillian basement in the Guerrero-Morelos Platform of Mexico? / René Levresse, Gilles Pierre (Universidad Nacional Autónoma de México. Programa de Geofluidos, Centro de Geociencias) ; Tritlla i Cambra, Jordi (Universidad Nacional Autónoma de México. Programa de Geofluidos, Centro de Geociencias) ; Deloule, Etienne (Centre de Recherches Pétrographiques et Géochimiques (França)) ; Pinto Linares, Porfirio Julio (Instituto Potosino de Investigación Científica y Tecnológica (Mèxic). Departamento de Geología Económica)
In the Guerrero-Morelos platform (Guerrero State, Mexico) the adakitic rocks of Early Tertiary age contain abundant hornblende-rich tonalite xenoliths. Zircon crystals have been concentrated from both adakites and xenoliths, and dated using in-situ U-Pb ion microprobe analyses. [...]
2007 - 10.1344/105.000000302
Geologica acta, Vol. 5, Núm. 2 (2007) , p. 167-175  
4.
17 p, 1.6 MB Dating the Triassic continental rift in the southern Andes : the Potrerillos Formation, Cuyo Basin, Argentina / Spalletti, Luis A. (Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo) ; Fanning, Mark (The Australian National University. Research School of Earth Sciences) ; Washington Rapela, Carlos (Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo) ; Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina). Centro de Investigaciones Geológicas
The Triassic successions of western Argentina commonly show thin pyroclastic levels intercalated within thick fluvial and lacustrine terrigenous deposits. The Potrerillos Formation is the thickest Triassic unit in the Cuyo Basin. [...]
2008 - 10.1344/105.000000256
Geologica acta, Vol. 6, Núm. 3 (Setembre 2008) , p. 267-283  
5.
5 p, 722.8 KB A revised Ordovician age for the Sisargas orthogneiss, Galicia (Spain). Zircon U-Pb ion-microprobe and LA-ICPMS dating / Talavera, Cristina (Universidad de Granada. Departamento de Mineralogía y Petrología) ; Bea, Fernando (Universidad de Granada. Departamento de Mineralogía y Petrología) ; González Montero, Pilar (Universidad de Granada. Departamento de Mineralogía y Petrología) ; Whitehouse, Martin (Swedish Museum of Natural History)
The Sisargas orthogneiss is located in the Schistose Domain of the Galicia Trás-Os-Montes Zone. It has previously been dated by Allegret and Iglesias (1987) who reported an U-Pb upper intercept at 570 ± 14 Ma, considered to be the crystallization age. [...]
2008 - 10.1344/105.000000259
Geologica acta, Vol. 6, Núm. 4 (Desembre 2008) , p. 313-317  
6.
9 p, 1.5 MB U-Pb zircon age of Ordovician magmatism in the Albera Massif (Eastern Pyrenees) / Liesa Torre-Marín, Montserrat (Universitat de Barcelona. Facultat de Geologia) ; Carreras, J. (Universitat Autònoma de Barcelona. Departament de Geologia) ; Castiñeiras, P. (Universidad Complutense de Madrid. Departamento de Petrología y Geoquímica) ; Casas Tuset, Josep Maria (Universitat de Barcelona. Departament de Geodinàmica i Geofísica) ; Navidad, M. (Universidad Complutense de Madrid. Departamento de Petrología y Geoquímica) ; Vilà, M. (Institut Geològic de Catalunya)
New geochronological data from the Albera Massif confirm the presence of an Early - Mid Ordovician igneous event (472 - 465Ma) recorded in the pre-Variscan rocks of the Pyrenees. This event resulted in the emplacement of a large granitic body in the lower part of the pre-Upper Ordovician metasedimentary succession and in the intrusion of a series of metric sized dykes in the middle and upper parts of it. [...]
2011 - 10.1344/105.000001651
Geologica acta, Vol. 9, Núm. 1 (Març 2011) , p. 93-101  

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