Navegação Ciências Exatas e da Terra por Assunto "Geocronologia"
Resultados 1-7 de 7
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Aeromagnetometry and aerogammaspectrometry integrated with U-Pb zircon geochronology of northern Bossoroca ophiolite, Brasiliano Orogen
(2021) [Artigo de periódico]Age delimitation integrated with aeromagnetometric and aerogammaspectrometric survey advances the understanding of ophiolite evolution in the Brasiliano Orogen. We focused on the Bossoroca ophiolite, because oceanic crustal ... -
Ion microproble (SHRIMP) dates complex granulite from Santa Catarina, southern Brazil
(2000) [Artigo de periódico]Complex polymetamorphic granulites have been dated in the Santa Catarina granulite complex of southern Brazil through SHRIMP study of zircon. This complex is dominated by intermediate-acid plutonic rocks and contains small ... -
Rb-Sr systematics of holocene pelitic sediments and their bearing on whole-rock dating
(2004) [Artigo de periódico]In many cases, when dealing with argillaceous fine-grained sedimentary rocks, the isotopic ages obtained from Rb–Sr whole-rock isochron calculations are of geological significance, despite the fact that the initial conditions ... -
SHRIMP U-Pb zircon dating of Pedras Grandes Suite, southern Santa Catarina State, Brazil
(2005) [Artigo de periódico]Dois dos principais pulsos da atividade granítica no Batólito Florianópolis em Santa Catarina ocorreram entre 613±5 Ma e 595±5 Ma, durante o Neoproterozóico do Ciclo Brasiliano. Estas idades foram obtidas a partir de ... -
The Mato Perso Conduit System: evidence of silicic magma transport in the southern portion of the Paraná-Etendeka LIP, Brazil
(2017) [Artigo de periódico]The Mato Perso Conduit System is described from a ~ 120 km2 area in south Brazil exposing silicic volcanics of the Paraná-Etendeka LIP. A volcanic succession is defined by basaltic flows covered by flat-lying oxidized ... -
Vulcanismo félsico paleoproterozóico do Grupo Iricoumé, domínio Erepecuru-Trombetas, província Amazônia central : dados de campo, caracterização petrográfica e geocronologia Pb-Pb em zircão
(2013) [Artigo de periódico]O Grupo Iricoumé compreende rochas vulcânicas efusivas e piroclásticas, com texturas e estruturas bastante preservadas, que pertence a um extenso evento vulcano-plutônico que marcou a região central do Cráton Amazônico ... -
Zircon U-Pb geochronology, Sm-Nd and Pb-Pb isotope systematics of Ediacaran post-collisional high-silica Acampamento Velho volcanism at the Tupanci area, NW of the Sul-Rio-Grandense Shield, Brazil
(2017) [Artigo de periódico]We present new U-Pb zircon ages and Sm-Nd-Pb isotopic data for volcanic and hypabyssal acid rocks from the northernmost exposure of the Acampamento Velho Formation in the NW portion of the Sul-Rio-Grandense Shield, Brazil. ...