Results 21 to 30 of about 14,875 (109)

Neoproterozoic magmatic arc volcanism in the Borborema Province, NE Brazil : possible flare-ups and lulls and implications for western Gondwana assembly.

, 2020
New zircon U-Pb (SHRIMP and LA-ICPMS), elemental and Nd-Sr geochemistry data on rhyolitic metavolcanic and metavolcaniclastic rocks of NE Brazil characterize widespread arc-related phenomena during the Neoproterozoic, related to the Conceição-type or ...
Caxito, Fabrício de Andrade, Medeiros, Vladimir Cruz de, Hagemann, Steffen, Basto, Camila Franco, Dias, Tatiana Gonçalves, Barrote, Vitor Rodrigues, Alkmim, Ana Ramalho, Lana, Cristiano de Carvalho, Dantas, Elton Luiz, Santos, Lauro Cézar Montefalco de Lira   +9 more
core   +1 more source

O depósito de Au-Ag-barita Zacarias, Orógeno Brasília, Brasil Central : mineralização vulcanogênica Toniana associada ao Arco Magmático Goiás [PDF]

, 2022
Dissertação (mestrado) — Universidade de Brasília, Instituto de Geociências, Programa de Pós-Graduação em Geologia, 2022.O depósito de Au-Ag-barita Zacarias (com reserva total em 650.000 t a 4,4 g/t Au, 48 g/t Ag e 10% de barita) é definido por ...
James, Meyre Jéssica
core  

The making of pure quartzose sand in continental interiors: Paraná River (Brazil and Argentina)

Sedimentology, Volume 73, Issue 3, Page 802-837, April 2026.
ABSTRACT As part of a comprehensive project on sedimentary processes in South America, this study focuses on sediment generation in the intracratonic Paraná Basin and monitors the evolution of sand composition along the Paraná River from central Brazil to the Río de la Plata estuary in Argentina.
Eduardo Garzanti, Marta Barbarano, Mara Limonta, Guido Pastore, Pieter Vermeesch, Giovanni Vezzoli   +5 more
wiley   +1 more source

Origin of Ultrapotassic, Ultracalcic, Ultrabasic SiO2‐Undersaturated Magmas: The Case Study of the Pleistocene Cupaello Kamafugite Monogenetic Volcano, Central Italy

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 1, January 2025.
Abstract The Pleistocene (∼0.6 Ma) Cupaello monogenetic volcano, cropping out in central Italy, belongs to the Intra Apennine Province (IAP). It is represented by a single lava flow with kamafugitic composition, associated with a volumetrically limited pyroclastic deposit and a phosphate‐rich layer close to the small vent.
Michele Lustrino, Lorenzo Pistocchi, Sara Ronca, Francesca Innocenzi, Samuele Agostini   +4 more
wiley   +1 more source

Shrimp U-Pb age and Sr-Nd isotopes of the Morro do Baú mafic intrusion: implications for the evolution of the Arenópolis volcano-sedimentary sequence, Goiás Magmatic Arc [PDF]

, 2015
The Arenópolis volcano-sedimentary sequence is located in the southern part of the Goiás Magmatic Arc and includes a ca. 900 Ma calc-alkaline arc sequence made of volcanic rocks ranging in composition from basalts to rhyolites, metamorphosed under ...
Pimentel, Marcio, Armstrong, Richard, Hollanda, Maria   +2 more
core  

GEOCRONOLOGIA E GEOQUÍMICA DO ORTOGNAISSE SÃO SEBASTIÃO DO PARAÍSO: EVIDÊNCIA DE ARCO MAGMÁTICO PALEOPROTEROZOICO NA FAIXA BRASÍLIA, GOIÁS: Geochronology and geochemistry of the São Sebastião do Paraíso Orthogneiss: evidence of a Paleoproterozoic magmatic arc in the Brasília Belt, Goiás

, 2023
In the NW Caldas Novas region (Goiás), interleaved within Araxá Group metasediments, occurs an orthogneiss lens (named São Sebastião do Paraíso orthogneiss), which was initially correlated as part of the Aragoiânia-type granitoid.
SANTOS, Pedro Henrique dos, NAVARRO, Guillermo Rafael Beltran, ARTUR, Antônio Carlos, ZANARDO, Antenor, LEME, Thais Güitzlaf   +4 more
core  

The Chapada Cu–Au deposit, Mara Rosa magmatic arc, Central Brazil: Constraints on the metallogenesis of a Neoproterozoic large porphyry-type deposit

, 2016
The large Chapada Cu–Au deposit is situated in Goias Magmatic Arc, Central Brazil, which is part of an accretionary orogen with tectonic evolution between ca. 900 and 600 Ma during the Brasiliano Orogeny.
Claudinei Gouveia de Oliveira, Frederico Bedran de Oliveira, M. D. Giustina, G. C. Marques, E. Dantas, M. Pimentel, B. Bühn   +6 more
semanticscholar   +1 more source

A neoproterozoic age for the chromitite and gabbro of the Tapo Ultramafic Massif, Eastern Cordillera, Central Peru, and its tectonic implications

, 2011
The ultramafic-mafic rocks of the Tapo Complex are exposed in the Eastern Cordillera of the Central Peruvian Andes. This complex is composed of serpentinised peridotites and metabasites with some podiform chromitite lenses and chromite disseminations and
Acosta, Jorge, Pereira, Eurico, Tassinari, Colombo Celso Gaeta, Jose F. Rodrigues, Rodrigues, Jose F., Eurico Pereira, Ricardo Castroviejo, Castroviejo Bolibar, Ricardo, Acosta Ale, Jorge Gilberto, Tassinari, Colombo G., Jorge Acosta, Colombo C.G. Tassinari, Rodrigues, José Feliciano   +12 more
core   +1 more source

Lineamento transbrasiliano, contribuição aerogeofísica, tectônica e geocronológica no setor nordeste da faixa Brasília [PDF]

, 2015
Dissertação (mestrado)—Universidade de Brasília, Instituto de Geociências, 2015.O Lineamento Transbrasiliano (LTB) é um sistema strike-slip situado entre o Cráton Amazônico e a porção leste da Plataforma Sul-Americana, sendo composto por vários segmentos
Praxedes, Igor Fernandes
core   +1 more source

The tectonic evolution of the Neoproterozoic Brasília Belt, central Brazil : a geochronological and isotopic approach [PDF]

, 2016
A Faixa Brasília é um dos mais completos orógenos Neoproterozoicos no Gondwana Ocidental. Durante os últimos dez anos, o rápido progresso no entendimento da evolução tectônica desse orógeno foi proporcionado pela produção de novos dados geocronológicos U-
Pimentel, Márcio Martins, Márcio Martins Pimentel (6137210)   +1 more
core   +1 more source