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	Provedor de dados Anais da ABC (AABC) (3) Autor Dehler,Nolan M. (1) Diniz,Hélio N. (1) Heaman,Larry M. (1) Janas,Valdecir A. (1) Karniol,Tiago R. (1) MEDEIROS,SILVIA R. (1) Machado,Rômulo (1) Simonetti,Antonio (1) Sobrinho,José M. Azevedo (1) VRIEND,SIMON (1) WIEDEMANN-LEONARDOS,CRISTINA M. (1) santoro,Jair (1) Mais... Palavra-chave Ribeira Belt (3) Granite (1) Kinematics (1) LA-ICPMS (1) Lithogeochemistry (1) Magma mingling (1) Post-collisional magmatism (1) Syncontractional extension (1) Transpression (1) Zircon U-Pb dating (1) Mais... Tipo do documento Info:eu-repo/semantics/article (3) Ano 2011 (1) 2008 (1) 2001 (1) País Brazil (3) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Evidence of mingling between contrasting magmas in a deep plutonic environment: the example of Várzea Alegre, in the Ribeira Mobile Belt, Espírito Santo, Brazil Anais da ABC (AABC) MEDEIROS,SILVIA R.; WIEDEMANN-LEONARDOS,CRISTINA M.; VRIEND,SIMON. At the end of the geotectonic cycle that shaped the northern segment of the Ribeira Mobile Belt (Upper Proterozoic to Paleozoic age), a late to post-collisional set of plutonic complexes, consisting of a wide range of lithotypes, intruded all metamorphic units. The Várzea Alegre Intrusive Complex is a post-collisional complex. The younger intrusion consists of an inversely zoned multistage structure envolved by a large early emplaced ring of megaporphyritic charnoenderbitic rocks. The combination of field, petrographic and geochemical data reveals the presence of at least two different series of igneous rocks. The first originated from the partial melting of the mantle. This was previously enriched in incompatible elements, low and intermediate REE and... Tipo: Info:eu-repo/semantics/article Palavras-chave: Magma mingling; Post-collisional magmatism; Ribeira Belt. Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000100009 The Ilha Anchieta Quartz Monzonite: the southernmost expression of ca. 500 Ma post-collisional magmatism in the Ribeira Belt Anais da ABC (AABC) Sobrinho,José M. Azevedo; Janas,Valdecir A.; Simonetti,Antonio; Heaman,Larry M.; santoro,Jair; Diniz,Hélio N.. The Ilha Anchieta Quartz Monzonite (IAQM) occupies most of the homonymous island in the coast of the state of São Paulo, and is intrusive into foliated rocks of the ~565 Ma Ubatuba Charnockite. The main petrographic variety is a porphyritic biotite-hornblende quartz monzonite with 2-4 cm tabular microcline megacrysts set in a medium-grained groundmass and magmatic foliation. Outcrop-scale structures indicate cumulative processes (modal and grain-size magmatic banding) and interaction with basic magmas (mafic microgranular enclaves). Lithogeochemical data indicates that the main variety is intermediate to acid (S1O2 = 63-67%), alkali-calcic, metaluminous and magnesian (mg# ~30), showing moderate Sr (300-400 ppm) and Ba (~1500 ppm) contents and relatively... Tipo: Info:eu-repo/semantics/article Palavras-chave: Granite; Lithogeochemistry; LA-ICPMS; Zircon U-Pb dating; Ribeira Belt. Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300010 Transpressive dextral shear in the Italva-Itaperuna section, Northern State of Rio de Janeiro, Brazil Anais da ABC (AABC) Karniol,Tiago R.; Machado,Rômulo; Dehler,Nolan M.. Structural analysis carried out on a segment of the Neoproterozoic Ribeira Belt, southeastern Brazil, show that it represents part of the transpressive dextral orogen related to the Central Mantiqueira Province. NNE-trending and steeply dipping regional mylonitic belts form anastomosed geometry, and describe a map-scale, S-C-like structure that is characterized by their deflection towards NE near the Além Paraíba Lineament. Lithological and structural control related to deformation partition were responsible for the formation of felsic mylonitic granulites with S-type granites lenses developed in ductile shear zones, alternated with less deformed intermediate to basic granulites associated with charnockites. The dextral shear sense indicators are... Tipo: Info:eu-repo/semantics/article Palavras-chave: Ribeira Belt; Kinematics; Transpression; Syncontractional extension. Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300016 Registros recuperados: 3 Primeira ... 1 ... Última

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