Results 31 to 40 of about 2,207 (139)

Origin and emplacement of syn-orogenic Variscan granitoids in Iberia the Beiras massif [PDF]

, 2005
The Beiras batholith consists of four main Variscan granitoid suites intruded into metasediments of Proterozoic-Cambrian and Palaeozoic age in Central Northern Portugal: a) the early, syn-D3 granodiorite-monzogranite suite (314-311 Ma); b) the highly ...
Azevedo, M. Rosário, Martins, M. Estela, Medina, J., Nolan, J., Valle Aguado, B.   +4 more
core   +1 more source

Age of the emerald mineralization from the Itabira-Nova Era District, Minas Gerais, Brazil, based on LA-ICP-MS geochronology of cogenetic titanite

Brazilian Journal of Geology
: In the Itabira-Nova Era Emerald District, southeast Brazil, gemological emerald is extracted from underground mines found in schist-type deposits at the contact zone of the Archean Metavolcanosedimentary Sequence of the Guanhães Complex and ...
Hanna Jordt-Evangelista, Cristiano Lana, Carlos Eduardo Reinaldo Delgado, Deiwys José Viana   +3 more
doaj   +1 more source

Caracterización de parámetros en la concentración de circones para andesitas, monzogranitos, riolitas, cuarcitas y cuarzomonzonitas

Boletín Geológico, 2018
El Laboratorio Químico de la sede Medellín del Servicio Geológico Colombiano está desarrollando investigaciones sobre la caracterización de diferentes parámetros implicados en el proceso de concentración de circones que se utilizan para datación ...
John Mauro Castaño Duque, Fredy Alonso Rodríguez, Carlos Andrés García   +2 more
doaj   +1 more source

Isotopic geochronology of granitic rocks from the Central Iberian Zone: comparison of methodologies [PDF]

, 2010
Five granitic rocks, concentrically disposed from core to rim, were distinguished in the Castelo Branco pluton. U-Pb-Th electron microprobe monazite ages from granitic rocks are similar and ranging between 297-303 Ma.
Antunes, I.M.H.R., Neiva, A.M.R., Silva, M.M.V.G.   +2 more
core   +3 more sources

Petrogenesis and U-Pb and Sm-Nd geochronology of the Taquaral granite: record of an orosirian continental magmatic arc in the region of Corumba - MS

Brazilian Journal of Geology
The Taquaral Granite is located on southern Amazon Craton in the region of Corumbá, westernmost part of the Brazilian state of Mato Grosso do Sul (MS), near Brazil-Bolivia frontier.
Letícia Alexandre Redes, Maria Zélia Aguiar de Sousa, Amarildo Salina Ruiz, Jean-Michel Lafon   +3 more
doaj   +1 more source

Tectonic evolution of the southern margin of the Amazonian craton in the late Mesoproterozoic based on field relationships and zircon U-Pb geochronology

Anais da Academia Brasileira de Ciências, 2014
New U-Pb zircon geochronological data integrated with field relationships and an airborne geophysical survey suggest that the Nova Brasilândia and Aguapeí belts are part of the same monocyclic, metaigneous and metasedimentary belt formed in the late ...
GILMAR J. RIZZOTTO, LÉO A. HARTMANN, JOÃO O.S. SANTOS, NEAL J. MCNAUGHTON   +3 more
doaj   +1 more source

U-Pb evidence for late Neoarchean crustal reworking in the Southern São Francisco Craton (Minas Gerais, Brazil)

Anais da Academia Brasileira de Ciências, 2003
The Passa Tempo Metamorphic Complex is one of several metamorphic complexes that form the Archean sialic crust of the southern São Francisco Craton. It encompasses hypersthene-bearing gneissic rocks, with subordinateNW- or EW-trending mafic-ultramafic ...
José C.S. Campos, Maurício A. Carneiro, Miguel A.S. Basei   +2 more
doaj   +1 more source

Petrologia, geoquímica e geocronologia de granulitos no sector São Fidélis-Santo António de Pádua, RJ, SE Brasil [PDF]

, 2006
O sector São Fidélis - Santo António de Pádua situa-se na zona centro-norte da Faixa Ribeira, SE do Brasil. Esta faixa móvel, formada aquando da Orogenia Brasiliana-Panafricana como resultado da colisão entre os crátons de São Francisco e Congo ...
Bento dos Santos, Telmo, Fonseca, Paulo E., Munhá, José, Neto, Coriolano Dias, Tassinari, Colombo C. G.   +4 more
core  

The Variscan gabbros from the Spanish Central System: A case for crustal recycling in the sub-continental lithospheric mantle? [PDF]

, 2009
The gabbroic intrusions that crop out along the Spanish Central System (SCS) are geochemically heterogeneous, including primitive and evolved rocks. Differentiation is mainly related to fractionation of Cr-spinel and olivine, but mixing with coeval ...
Billstrom, Kjell, López García, José Ángel, Orejana García, David, Pérez-Soba Aguilar, Cecilia, Villaseca González, Carlos   +4 more
core   +2 more sources

Sistema de dobramentos Piancó-Alto Brígida (PE-PB-CE), Regionalização geotectônica e geocronologia

Geologia USP. Série Científica, 2018
O Sistema de Dobramentos Piancó-Alto Brígida (SPAB) situa-se na porção central a centro-ocidental da Zona Transversal, da Província Borborema, nos Estados da Paraíba e do Pernambuco e em parte do Estado do Ceará. Trata-se do produto de um desenvolvimento
Benjamim Bley de Brito Neves, William Randall Van Schmus, Mario da Costa Campos Neto   +2 more
doaj   +1 more source