Results 91 to 100 of about 848 (205)

SiO2-saturated potassic alkaline magmatism in the central Amazonian Craton, southernmost Uatumã-Anauá Domain, NE Amazonas, Brazil

Brazilian Journal of Geology
: This paper approaches the record of SiO2-saturated potassic alkaline magmatism of Castanhal Quartz Monzonite, Mapuera Suite, and Ladeira da Vovó Quartz Syenite. These samples are located near the Northern border of the Amazon Basin. Such rocks show K2O
Cristóvão da Silva Valério, Moacir José Buenano Macambira, Valmir da Silva Souza, Elton Luiz Dantas   +3 more
doaj   +1 more source

The Paleoproterozoic metaconglomerate-hosted Castelo de Sonhos gold deposit, Tapajós Gold Province, Amazonian Craton: a modified paleoplacer origin

Journal of the Geological Survey of Brazil, 2018
The Castelo de Sonhos gold deposit (~1.5 Moz Au) is located in the southeastern Tapajós Gold Province and is hosted in variably deformed metaconglomerates and metasandstones of the Castelo dos Sonhos Formation, which was deposited between 2011 and 2050 ...
Joana Queiroz, Evandro Klein
doaj   +1 more source

Contribuição ao estudo do magmatismo Paleo e Mesoproterozóico do SW do Craton Amazônico através da aplicação de isótopos estáveis de O, H e S Contribution to the study of the Paleo and Mesoproterozoic magmatism of the SW Amazonian craton based on stable isotopes of O, H and S

Acta Amazonica, 2008
Os isótopos estáveis de O, H e S foram utilizados para investigar a origem das rochas magmáticas nos Terrenos Jauru e Pontes e Lacerda do SW do Craton Amazônico, estado de Mato Grosso, Brasil.
Mauro Cesar Geraldes, Wilson Teixeira, Claudia Sayão Valladares   +2 more
doaj   +1 more source

The Montesbelos mass-flow (southern Amazonian craton, Brazil): a Paleoproterozoic volcanic debris avalanche deposit?

, 2016
The present contribution documents the extremely well-preserved Paleoproterozoic architecture of the Montesbelos breccia (named here for the first time), which is interpreted as a rare example of a subaerial paleoproterozoic (>1.85 Ga) granular ...
Roverato, M.
core   +1 more source

Paleomagnetic Study of the Rincón del Tigre Mafic- ultramafic Complex Southeastern Bolivian, Amazonian Craton

, 2019
Modelos de reconstruções paleogeográficas envolvendo o Cráton Amazônico para 1100 Ma são motivos de controvérsia devido à carência de dados paleomagnéticos de qualidade para esta unidade geotectônica.
Patroni, Oscar Andres Lazcano
core   +1 more source

Sublithospheric diamond ages and the supercontinent cycle. [PDF]

Nature, 2023
Timmerman S, Stachel T, Koornneef JM, Smit KV, Harlou R, Nowell GM, Thomson AR, Kohn SC, Davies JHFL, Davies GR, Krebs MY, Zhang Q, Milne SEM, Harris JW, Kaminsky F, Zedgenizov D, Bulanova G, Smith CB, Cabral Neto I, Silveira FV, Burnham AD, Nestola F, Shirey SB, Walter MJ, Steele A, Pearson DG.   +25 more
europepmc   +1 more source

Towards Columbia: paleomagnetism of 1980–1960 Ma Surumu volcanic rocks, Northern Amazonian Craton

, 2014
We present a paleomagnetic study on the well-dated 1980–1960 Ma (U-Pb) volcanic rocks from theSurumu Group, northern Roraima State (Amazonian Craton).
Santos, Franklin Bispo dos, Filho, Manoel Souza Dagrella, Reis, Maria Anna Abreu de Almeida dos, Trindade, Ricardo Ivan Ferreira da, Janikian, Liliane, Reis, Nelson J.   +5 more
core   +1 more source

Subduction-related oxidation of the sublithospheric mantle evidenced by ferropericlase and magnesiowüstite diamond inclusions. [PDF]

Nat Commun, 2022
Kiseeva ES, Korolev N, Koemets I, Zedgenizov DA, Unitt R, McCammon C, Aslandukova A, Khandarkhaeva S, Fedotenko T, Glazyrin K, Bessas D, Aprilis G, Chumakov AI, Kagi H, Dubrovinsky L.   +14 more
europepmc   +1 more source

U-Pb zircon ages of rocks from the Amazonas Territory of Colombia and their bearing on the tectonic history of the NW sector of the Amazonian Craton

Brazilian Journal of Geology
: Here we report the results of several U-Pb zircon ages, made to generate an integrated history for the Rio Negro-Juruena tectonic province, for the northwestern part of the Amazonian Craton.
Umberto Giuseppe Cordani, Kei Sato, Walter Sproessner, Fabiana Santos Fernandes   +3 more
doaj   +1 more source

The Jurassic basaltic magmatism of the Tacutu rift-type basin, Amazonian Craton, Brazil: A contribution to petrological studies

Journal of the Geological Survey of Brazil
The Tacutu rift-type basin (on the border of Brazil and Guyana) is related to the initial opening of the Equatorial Atlantic Ocean during the Mesozoic.
Steffanie Oliveira, Valmir Souza, Stélio Tavares Júnior, Reinhardt Fuck   +3 more
doaj   +1 more source