Search Results - "Sommer, Carlos Augusto"

Geomorphology and spatial distribution of monogenetic volcanoes in the southern Puna Plateau (NW Argentina) by Haag, Maurício Barcelos, Baez, Walter Ariel, Sommer, Carlos Augusto, Arnosio, José Marcelo, Filipovich, Rubén Eduardo

“…Monogenetic volcanoes are the most common volcanic landforms on Earth. Several works have shown that the study of geomorphology and spatial distribution of…”
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The Colider and Roosevelt olcanic rocks (sw amazonian craton):geochemistry and sm-nd isotope characteristics of a silicic large igneous province by Bruna Saar de Almeida, Mauro César Geraldes, Carlos Augusto Sommer, Felipe Corrales, Antonio Jo(a)o Paes de Barros

“…The volcanic rocks of the Colíder and Roosevelt formations are extensively exposed in the south-central portion of the Amazonian Craton where effusive and…”
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Geophysical characterization and modeling of a Neoproterozoic intrusive volcaniclastic lamprophyre in southernmost Brazil by Baesso, Anderson, Sommer, Carlos Augusto, Savian, Jairo Francisco, Gambeta, Johnathan Henrique, Aquino, Robson dos Santos

“…Abstract Neoproterozoic spessartitic lamprophyres are linked to the Lavras do Sul Shoshonitic Association in the Sul-Riograndense Shield, southernmost Brazil…”
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Occurrence of dravitic tourmaline in a diamond-bearing breccia: a possible lamproite deposit in the Alto Paranaíba Igneous Province by Vieira, Ana Carolina Batista, Almeida-Abreu, Pedro Angelo, Batillani, Gislaine Ámores, Sommer, Carlos Augusto

“…Abstract The mineral chemistry of diamond indicator minerals is used to trace mineralizations in primary rocks such as lamproites/kimberlites and in secondary…”
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Post-collisional basalts of the Acampamento Velho Formation, Camaquã Basin, São Gabriel Terrane, southernmost Brazil by Vedana, Luiz Alberto, Philipp, Ruy Paulo, Sommer, Carlos Augusto

“…The basic volcanic rocks in the Palma region, southern portion of the São Gabriel Terrane, have always been interpreted as generated during the active…”
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The 1.88 Ga Uatumã Magmatism in the Serra dos Magalhães region: petrology and implications to the extension of the south-eastern edge of the Amazonian Craton by Lima, Ianna Ferreira de, Pierosan, Ronaldo, Barros, Márcia Aparecida de Sant'Ana, Rubert, Rogério Roque, Sommer, Carlos Augusto, Okuno, Diogo Isamu de Almeida

“…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…”
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The Mato Perso Conduit System: evidence of silicic magma transport in the southern portion of the Paraná-Etendeka LIP, Brazil by Simões, Matheus Silva, Lima, Evandro Fernandes de, Sommer, Carlos Augusto, Rossetti, Lucas de Magalhães May

“…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…”
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Pb isotope geochemistry and reappraisal of Sr-Nd isotopes of the Cerro Morado basic magmatism (Ischigualasto-Villa Union Triassic basin, NW Argentina): Implications for the mantle sources by Sommer, Carlos Augusto, Barreto, Carla Joana S., Lafon, Jean Michel, Lima, Evandro Fernandes de, Alexandre, Felipe Marcelo, Chemale Jr, Farid, Koester, Edinei

“…Sr-Nd-Pb isotopic signatures were determined for silica-undersaturated hypabyssal alkaline basic rocks of the Los Baldecitos Formation in the Cerro Morado…”
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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 by Sommer, Carlos Augusto, Leitzke, Felipe Padilha, Lima, Evandro Fernandes de, Barreto, Carla Joana Santos, Lafon, Jean Michel, Matté, Vinicius, Philipp, Ruy Paulo, Conceição, Rommulo Vieira, Basei, Miguel Ângelo Stipp

“…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…”
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Ediacaran Na-alkaline Acampamento Velho volcanism in the Ramada Plateau, southernmost Brazil: Sr–Nd–Pb isotopic data and petrogenetic evolution by Matté, Vinicius, Sommer, Carlos Augusto, Fernandes de Lima, Evandro, Koester, Edinei

“…[Display omitted] •Ediacaran volcanic and subvolcanic rocks occur in southernmost Brazil.•Basic to acid magmatism is related to sodic alkaline series.•Mainly…”
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Reoignimbritos e ignimbritos de alto grau do vulcanismo Acampamento Velho, RS: origem e temperatura de formação by Carlos Augusto Sommer, Evandro Fernandes de Lima, Ronaldo Pierosan, Adriane Machado

“…Resumo: A Formação Acampamento Velho é constituída por depósitos vulcânicos neoproterozoicos dominantemente ácidos, emplaçados em condições subaéreas sobre o…”
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Textural analysis and emplacement conditions of well-preserved Orosirian felsic volcanic rocks of northern Amazon Craton, Brazil by Barreto, Carla Joana Santos, Haag, Mauricio Barcelos, Lafon, Jean Michel, Sommer, Carlos Augusto, da Rosa-Costa, Lúcia Travassos

“…[Display omitted] •Predominance of volcaniclastic facies with eutaxitic and parataxitic textures.•Water strongly affect the rheology of the melts, reducing η,…”
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Quantitative spatial distribution analysis of mafic monogenic volcanism in the southern Puna, Argentina: Implications for magma production rates and structural control during its ascent by Morfulis, Marcos, Báez, Walter, Retamoso, Santiago, Bardelli, Lorenzo, Filipovich, Rubén, Sommer, Carlos Augusto

“…Establishing the factors that control the pathways of magma ascent is an important issue in the study of monogenic mafic volcanism since it provides…”
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Ediacaran post-collisional high-silica volcanism associated to the Florianópolis Batholith, Dom Feliciano Belt, southernmost Brazil: lithofacies analysis and petrology by Santos, Erico Albuquerque dos, Sommer, Carlos Augusto, Waichel, Breno Leitão, Haag, Mauricio Barcelos

“…The Cambirela Silicic Volcanic Sequence is the only Neoproterozoic volcanic manifestation in the Florianópolis Batholith. The sequence is associated with the…”
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The low-Ti high-temperature dacitic volcanism of the southern Paraná-Etendeka LIP: Geochemistry, implications for trans-Atlantic correlations and comparison with other Phanerozoic LIPs by Simões, Matheus S., Lima, Evandro F., Rossetti, Lucas M.M., Sommer, Carlos A.

“…The low-Ti silicic volcanic units of the Paraná-Etendeka Large Igneous Province (LIP) have a high volume (~20,000 km3) and are widespread in South America and…”
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The 1800-1770 Ma Colider silicic large igneous province in the Amazonian craton: crustal evolution using zircon in situ REE compositions, U-Pb ages and Hf isotope analyses by Almeida, Bruna Saar, Sommer, Carlos Augusto, Chemale, Farid, Paes de Barros, Antonio João, Geraldes, Mauro Cesar

“…This paper presents zircon U-Pb, REE and Hf data for Paleoproterozoic felsic volcanic rocks from the Colíder Group with outcrops in the southwestern Amazonian…”
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Neoproterozoic potassic andesitic and lamprophyric rocks in the tupanci area, southernomost Brazil: Petrology and associated mineralization by Lara, Luis Fernando de, Sommer, Carlos Augusto, Matté, Vinicius, Lima, Evandro Fernandes de, Buckowski, Natália, Pereira, Vítor Paulo, Gomide, Caroline Siqueira

“…Au and sulfide mineralizations occur in the Sul-Rio-Grandense Shield, and important occurrences of these metals are reported and attributed to the Lavras do…”
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Multi-proxy case study of a Neoproterozoic rhyolite flow in southernmost Brazil: Emplacement mechanisms and implications for ancient felsic lavas by Haag, Maurício Barcelos, de Freitas, Rayane Bastos, Sommer, Carlos Augusto, Savian, Jairo Francisco, Lima, Evandro Fernandes, Gambeta, Johnathan Henrique, Lyra, Diego da Silveira, Trindade, Ricardo Ivan Ferreira da

“…Rhyolites compose an important record in the volcanic history of Earth, with significant occurrences in volcanic arcs, large igneous provinces and…”
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Petrogenesis of low-Ti dolerite sills from Paraná-Etendeka LIP in Cerro do Coronel region, southernmost Brazil by Simões, Matheus Silva, Sarmento, Carla Cecília Treib, Sommer, Carlos Augusto, de Lima, Evandro Fernandes, Rossetti, Lucas de Magalhães May, Koester, Edinei

“…In Large Igneous Provinces (LIPs), sills are a key component of the plumbing system responsible for magma transport through the crust where magma fractionation…”
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AMS and rock magnetism in the Caviahue-Copahue Volcanic Complex (Southern Andes): Emission center, flow dynamics, and implications to the emplacement of non-welded PDCs by Haag, Mauricio Barcelos, Sommer, Carlos Augusto, Savian, Jairo Fransciso, Caselli, Alberto Tomás, Moncinhatto, Thiago Ribas, Hartmann, Gelvam André, Ort, Michael H., Poletti, Wilbor, da Trindade, Ricardo Ivan Ferreira

“…Pyroclastic deposits can cover significant areas and register major geological events. Despite their importance, understanding depositional dynamics of…”
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