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Resultados globales: 11 registros encontrados en 0.02 segundos.
Artículos, Encontrados 11 registros
Artículos Encontrados 11 registros  1 - 10siguiente  ir al registro:
1.
27 p, 5.8 MB Petrogenesis of the late Miocene Chenar volcanism in the southeast Urumieh-Dokhtar magmatic belt, Kerman, Iran : evidence from geochemical, U-Pb geochronologic, and Hf isotopic constraints: Petrogenesis and geochronologic of the Chenar volcanism (Iran) / Salehi Nejard, Hamideh (Shahid Bahonar University of Kerman. Department of Geology) ; Shahosinie, Elham (Islamic Azad University. North Tehran Branc. Department of Geology) ; Nazarinia, Asma (University of Hormozgan. Department of Geology) ; Lentz, David R. (University of New Brunswick. Department of Earth Sciences)
The Chenar volcanic cone intruded the southeastern part of the Dehaj-Sarduiyeh volcano-sedimentary belt, in the southeast Urumieh-Dokhtar magmatic arc in Iran. The adakitic rocks, with porphyritic texture, mainly consist of rhyodacites and dacites,commonly comprised of phenocrysts of plagioclase, hornblende and biotite, with rare K-feldspar in a groundmass composed of plagioclase, K-feldspar and quartz. [...]
2024 - 10.1344/GeologicaActa2024.22.1
Geologica acta, Vol. 22 (2024) , p. 1-23, I-IV (Articles)  
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2.
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)  
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3.
19 p, 3.6 MB Late-Variscan multistage hydrothermal processes unveiled by chemical ages coupled with compositional and textural uraninite variations in W-Au deposits in the western Spanish Central System Batholith / Timón Sánchez, Susana (Instituto Geológico y Minero de España) ; López-Moro, Francisco Javier (Universidad de Salamanca. Departamento de Geología) ; Romer, R. L. (Deutsches GeoForschungsZentrum (GFZ)) ; Rhede, D. (Deutsches GeoForschungsZentrum (GFZ)) ; Fernández-Fernández, Agustina (Universidad de Salamanca. Departamento de Geología) ; Moro-Benito, María Candelas (Universidad de Salamanca. Departamento de Geología)
The scheelite skarn from Los Santos and the W-Au veins from El Cabaco district, located in the Spanish Central System Batholith (SCSB), are some of the best-known tungsten ore deposits in Spain. Uraninite is an accessory mineral in both deposits, which underwent several hydrothermal flow events. [...]
2019 - 10.1344/GeologicaActa2019.17.1
Geologica acta, Vol. 17 (2019) , p. 1-19 (Articles)  
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4.
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  
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5.
25 p, 2.6 MB The spatial and compositional evolution of the Late Jurassic Ghorveh-Dehgolan plutons of the Zagros Orogen, Iran : SHRIMP zircon U-Pb and Sr and Nd isotope evidence / Yajam, S. (Kharazmi University (Teheran, Iran). Department of Geology) ; Montero, P. (Universidad de Granada. Departamento de Mineralogía y Petrología) ; Scarrow, J. H. (Universidad de Granada. Departamento de Mineralogía y Petrología) ; Ghalamghash, J. (Geological Survey of Iran) ; Razavi, S. M. H. (Kharazmi University (Teheran, Iran). Department of Geology) ; Bea, Fernando (Universidad de Granada. Departamento de Mineralogía y Petrología)
The Ghorveh-Dehgolan plutons of the northern Sanandaj-Sirjan Zone, Zagros Orogen, comprise seven composite intrusive bodies that were generated during northeastward subduction of Neotethys beneath the Iranian sector of the Eurasian plate. [...]
2015 - 10.1344/GeologicaActa2015.13.1.2
Geologica acta, Vol. 13 Núm. 1 (March 2015) , p. 25-43  
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6.
11 p, 2.3 MB U-Pb dating of Ordovician felsic volcanism in the Schistose Domain of the Galicia-Trás-os-Montes Zone near Cabo Ortegal (NW Spain) / Valverde-Vaquero, P. (Justus-Liebig Universität. Institut für Geowissenchaften) ; Marcos, A. (Universidad de Oviedo. Departamento de Geología) ; Farias Arquer, Pedro (Universidad de Oviedo. Departamento de Geología) ; Gallastegui Suárez, Gloria María (Instituto Geológico y Minero de España) ; Geological Survey of Canada. Continental Geoscience Division ; Instituto Geológico y Minero de España
The northern termination of the Schistose Domain of the Galicia-Trás-os-Montes Zone is a tectonic slice named the Rio Baio Thrust Sheet, which is sandwiched between the Cabo Ortegal Complex and the Ollo de Sapo Domain of the Central-Iberian Zone. [...]
2005 - 10.1344/105.000001412
Geologica acta, Vol. 3, Núm. 1 (2005) , p. 27-37  
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7.
7 p, 265.0 KB A revised Ordovician age for the Miranda do Douro orthogneiss, Portugal. Zircon U-Pb ion-microprobe and LA-ICPMS dating / Bea, Fernando (Universidad de Granada. Departamento de Mineralogía y Petrología) ; Mntero, P. (Universidad de Granada. Departamento de Mineralogía y Petrología) ; Talavera, C. (Universidad de Granada. Departamento de Mineralogía y Petrología) ; Zinger, T. (Russian Academy of Sciences. Institute of Precambrian Geology and Geochronology)
The Miranda do Douro orthogneiss was believed to be the oldest magmatic rock of the Central Iberian Zone, on the base of a U-Pb discordia upper intercept of 618 ± 9 Ma. Nevertheless, new ion-microprobe and LA-ICPMS U-Pb zircon dating revealed that the crystallization age was 483 ± 3 Ma. [...]
2006 - 10.1344/105.000000353
Geologica acta, Vol. 4, Núm. 3 (2006) , p. 395-401  
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8.
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  
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9.
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  
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10.
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  
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Artículos : Encontrados 11 registros   1 - 10siguiente  ir al registro:
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