Zobrazeno 1 - 10
of 69
pro vyhledávání: '"Carlos Augusto Sommer"'
Autor:
Anderson Baesso, Carlos Augusto Sommer, Jairo Francisco Savian, Johnathan Henrique Gambeta, Robson dos Santos Aquino
Publikováno v:
Brazilian Journal of Geology, Vol 52, Iss 3 (2022)
Abstract Neoproterozoic spessartitic lamprophyres are linked to the Lavras do Sul Shoshonitic Association in the Sul-Riograndense Shield, southernmost Brazil. Bodies of intrusive spessartitic lamprophyres occur in trachyandesites of this association
Externí odkaz:
https://doaj.org/article/d44912beb0644dd4af3b94f8e86b8459
Autor:
Ana Carolina Batista Vieira, Pedro Angelo Almeida-Abreu, Gislaine Ámores Batillani, Carlos Augusto Sommer
Publikováno v:
Brazilian Journal of Geology, Vol 52, Iss 3 (2022)
Abstract The mineral chemistry of diamond indicator minerals is used to trace mineralizations in primary rocks such as lamproites/kimberlites and in secondary deposits. Subcalcic garnets and magnesian ilmenites are both minerals associated with the d
Externí odkaz:
https://doaj.org/article/a99dafc735884276b83189342118bd1c
Autor:
Ianna Ferreira de Lima, Ronaldo Pierosan, Márcia Aparecida de Sant'Ana Barros, Rogério Roque Rubert, Carlos Augusto Sommer, Diogo Isamu de Almeida Okuno
Publikováno v:
Brazilian Journal of Geology, Vol 51, Iss 1 (2020)
Abstract The Amazonian Craton (AC) is a Pre-Cambrian tectonic segment that extends over 4.3 × 105 km2 at the northern portion of the South American Platform. Phanerozoic sedimentary basins cover most of the edges of the AC and sparse occurrences of
Externí odkaz:
https://doaj.org/article/616fd9e83e4c488cb9b32b9c7f02de45
Autor:
Matheus Silva Simões, Evandro Fernandes de Lima, Carlos Augusto Sommer, Lucas de Magalhães May Rossetti
Publikováno v:
Brazilian Journal of Geology, Iss 0 (2018)
ABSTRACT: 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 vitrophyres, banded v
Externí odkaz:
https://doaj.org/article/e52cfab341c0405d9f7c53b5137dbda8
Autor:
Carla Cecília Treib Sarmento, Carlos Augusto Sommer, Evandro Fernandes de Lima, Diego Skieresz de Oliveira
Publikováno v:
Geologia USP. Série Científica, Vol 14, Iss 2, Pp 23-44 (2014)
The Serra Geral Formation is characterized by an expressive volume of tholeiitic basic lava flows and a subordinate presence of acid volcanites. Intrusive bodies (dikes and sills) are correlated to this unit, and, along with volcanic deposits, consti
Externí odkaz:
https://doaj.org/article/bf89819e872941b5baf6d22871b16c97
Autor:
Carla Cecília Treib Sarmento, Carlos Augusto Sommer, Evandro Fernandes de Lima, Diego Skieresz de Oliveira
Publikováno v:
Geologia USP. Série Científica, Vol 14, Iss 2 (2014)
A Formação Serra Geral é caracterizada por um expressivo volume de derrames básicos de composição toleítica e pela presença muito subordinada de vulcanitos ácidos. Inúmeros corpos intrusivos (soleiras e diques) são correlacionados com esta
Externí odkaz:
https://doaj.org/article/541ffa179bcc426ea20c9db14287e14b
Publikováno v:
Brazilian Journal of Geology, Vol 47, Iss 3, Pp 467-489
ABSTRACT: The basic volcanic rocks in the Palma region, southern portion of the São Gabriel Terrane, have always been interpreted as generated during the active subduction period of the São Gabriel orogeny (Cryogenian). This terrane was built as th
Externí odkaz:
https://doaj.org/article/ac1e96ee62f1459e84f631568899bd2c
Autor:
Carlos Augusto Sommer, Carla Joana S. Barreto, Jean Michel Lafon, Evandro Fernandes de Lima, Felipe Marcelo Alexandre, Farid Chemale Jr., Edinei Koester
Publikováno v:
Brazilian Journal of Geology, Vol 48, Iss 1, Pp 115-126
ABSTRACT: Sr-Nd-Pb isotopic signatures were determined for silica-undersaturated hypabyssal alkaline basic rocks of the Los Baldecitos Formation in the Cerro Morado area, situated in the Ischigualasto - Vale de la Luna Provincial Park (northernmost S
Externí odkaz:
https://doaj.org/article/fa29790468ff4da09044daf0ebd9bf0f
Autor:
Carlos Augusto Sommer, Felipe Padilha Leitzke, Evandro Fernandes de Lima, Carla Joana Santos Barreto, Jean Michel Lafon, Vinicius Matté, Ruy Paulo Philipp, Rommulo Vieira Conceição, Miguel Ângelo Stipp Basei
Publikováno v:
Brazilian Journal of Geology, Vol 47, Iss 4, Pp 545-560
ABSTRACT: 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. The first volcani
Externí odkaz:
https://doaj.org/article/f7331f05ebf0490da957203a429fc2ec
Publikováno v:
Brazilian Journal of Geology, Vol 41, Iss 3, Pp 420-435
Resumo: A Formação Acampamento Velho é constituída por depósitos vulcânicos neoproterozoicos dominantemente ácidos, emplaçados em condições subaéreas sobre o Escudo Sul-Rio-Grandense. Registros deste vulcanismo são encontrados nos platôs
Externí odkaz:
https://doaj.org/article/b97f61c54eb348bcac2b3f039d289dec