Glaciation
Mostrando 1-12 de 35 artigos, teses e dissertações.
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1. Sedimentology and stratigraphy of Neoproterozoic-lower Paleozoic carbonate-siliciclastic succession of the southwesternmost Amazon Craton, state of Rondônia, Brazil
ABSTRACT: Facies and stratigraphic analysis were carried out in Neoproterozoic-Lower Paleozoic carbonate-siliciclastic deposits of Cacoal and Pimenta Bueno formations exposed on basement rocks and into the Pimenta Bueno Graben, northwestern portion of Parecis Basin, southwesternmost Amazon Craton. The redescription and redefinion of this succession confirmed
Braz. J. Geol.. Publicado em: 22/02/2018
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2. Sedimentary provenance in the southern sector of the São Francisco Basin, SE Brazil
ABSTRACT: We present new Sm-Nd, U-Pb and Hf isotope geochronological data for the siliciclastic rocks in the southern sector of the São Francisco Basin. An abrupt change in the Sm-Nd data is observed from the Carrancas Formation’s oligomitic conglomerates (TDM ages between 2.7 and 3.3 Ga; εNd(550 Ma) values between -25.09 and -17.98), its finer facies, a
Braz. J. Geol.. Publicado em: 2018-01
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3. The island rule in the Brazilian frog Phyllodytes luteolus (Anura: Hylidae): incipient gigantism?
ABSTRACT The island rule suggests that, when mainland animals are isolated on islands, large animals tend to become smaller, while small animals tend to become larger. A small frog in eastern Brazil, Phyllodytes luteolus (Wied-Neuwied, 1824), is widely distributed in association with bromeliads. At the end of the last glaciation, parts of the mainland became
Zoologia (Curitiba). Publicado em: 2015-10
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4. Análise populacional genética de Larus dominicanus através do uso de microssatélites / Population genetic analysis of Larus dominicanus using microsatellites
The changes in the coast that has been caused by human action has led to impacts on species associated with this environment. Larus dominicanus is a seabird species widely distributed throughout the Southern Hemisphere. The generalist feeding habits allow this species take advantage from human action, leading to population growth, which is also observed in o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/02/2012
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5. Micropaleontolgy applied to the stratigraphic and paleoclimatic interpretation of the transition between the Paranoá Group and São Francisco Supergroup (Neoproterozoic, Cabeceiras, Goiás) / Micropaleontologia aplicada na interpretação estratigráfica e paleoclimática da transição entre o Grupo Paranoá e o Supergrupo São Francisco (Neoproterozóico, Cabeceiras, GO)
The Proterozoic record of the Fazenda Funil, near Cabeceiras, GO, includes three sedimentary units: carbonate at the top of Paranoá Group, diamictite of the Jequitaí Formation, and a succession of shale, marl-shale rhythmites, and carbonate of the Sete Lagoas Formation. Microfossiliferous chert occurs in these three units in the form of lenses in the Paran
Publicado em: 2010
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6. Evolução tectono-estratigráfica e paleoclimática da formação maricá (Escudo Sul-Rio-Grandense, Brasil) : um exercício de geologia histórica e análise integrada de uma bacia sedimentar neoproterozóica
Significant improvement in the knowledge concerning the Neoproterozoic Maricá Formation of the Sul-riograndense Shield, southern Brazil, was obtained in the latest years. This contribution synthesizes recent data obtained though an integrated analysis of the lowermost unit of the “Camaquã Basin”. Stratigraphic and paleocurrent analyses, petrography, Sr
Publicado em: 2010
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7. Sedimentary facies and provenance of the Bebedouro Formation, Neoproterozoic (BA) / Fácies sedimentares e proveniência da Formação Bebedouro, Neoproterozóico (BA)
The sedimentary record of Neoproterozoic age has become a major subject of research since the rebirth of the models of extreme glaciation and rapid climatic changes for the period, including the Snowball Earth hypothesis. These models are founded on the identification, in all continents, of Neoproterozoic diamictites directly overlain by carbonates, which ar
Publicado em: 2008
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8. Simulação do clima do último máximo glacial: um experimento com um modelo estatístico - dinâmico / Simulation of the last glacial maximum climate: a experiment with a statistical-dynamical model
A statistical - dynamical zonally averaged model of primitive equations was used to evaluate the capacity of the model in simulating the zonally averaged climate of the Last Glacial Maximum (LGM), studying the relative importance of the climate forcing in the LGM climate and to diagnosis the monsoon circulation in the LGM. The simulation of the LGM resulted
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/05/2007
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9. Taxonomy of invertebrate fossils (Oligocene-Miocene) from the King George island (West Antarctica) and paleobiogeography of cenozoic Bivalvia from Antarctica / Taxonomia de invertebrados fósseis (Oligoceno-Mioceno) da ilha Rei George (Antártica ocidental) e paleobiogeografia dos Bivalvia cenozóicos da Antártica
The research presented in this dissertation comprised part of the CNPq - PROANTAR Project 550352/02-3 "Mudanças paleoclimáticas na Antártica durante o Cenozóico: o registro geológico terrestre", which studies Cenozoic deposits from King George Island in order to elucidate the environmental and climatic Cenozoic histories of this Antarctic region. Cenozo
Publicado em: 2007
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10. Simulation of the last glacial maximum climate: a experiment with a statistical-dynamical model / Simulação do clima do último máximo glacial: um experimento com um modelo estatístico - dinâmico
Um modelo estatístico - dinâmico média zonal de equações primitivas foi utilizado para avaliar a capacidade do modelo em simular o clima médio zonal do Último Máximo Glacial (UMG), estudar a importância relativa das forçantes climáticas no clima do UMG e diagnosticar a circulação monçonica no UMG. A simulação do UMG resultou em um resfriament
Publicado em: 2007
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11. Análise e correlação de seqüências de 3a ordem do Subgrupo Itararé (PC), entre a região de Sorocaba-Itapetininga, SP, e a região ao sul do Arco de Ponta Grossa, Bacia do Paraná, Brasil / 3rd order sequence stratigraphy of Itararé Subgroup (Neopaleozoic), within Sorocaba - Itapetininga (SP) and the south area of Ponta Grossa Arch, Parana Basin, Brazil
The Itararé Subgroup (Carboniferous-Permian) of the Paraná Basin of southeastern Brazil contains the thickest, most extensive and one of the longest records of late Paleozoic glaciation in all of the Gondwana supercontinent. In the studied area, situated between the cities of Sorocaba and Itapetininga, São Paulo State, this record is characterized by glac
Publicado em: 2007
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12. Tafoflora deógena de depósitos provavelmente correlatos à formação Rio Claro, ocorrente no Município de Jaguariúna, SP
The Jaguariúna taphoflora occurs in Cenozoic sediment probably correlated or included in the Rio Claro Formation, outcropping at the left margin of the km 136,5 of the highway SP-340 (from Campinas to Mogi Mirim direction). This taphoflora is preserved as foliar impressions (parts and counterparts) covered by whitish film, on a massive variegated yellow-ora
Publicado em: 2007