Dwight Edward Ward, Richard Goldsmith, Jaime Cruz B., Hemán Restrepo A.,
... bajo a medio grado, del Precámbrico Superior al Ordoviciano, incluyen filita, esquisto, metalimolita, metaarenisca y mármol de ... probablemente representa rocas de dos edades, Precámbrico y Ordoviciano a Devónico Inferior. El ortoneis más jóven y ... Silgará estuvieron sometidos a condiciones parecidas durante el Ordoviciano Superior y el Silúrico Inferior, pero sólo alcanzaron ...
Tópico(s): Water Resource Management and Quality
1973 - | Boletín Geológico
Fabrizio Cocco, Antonio Luca Funedda,
Nuovi dati sulla deformazione pre-Ordoviciano medio nella Sardegna sudorientale: nota preliminare.In questa nota vengono presentati dei dati che permettono di riconoscere, nella Sardegna sud-orientale, un piegamento che interessa solo la successione pre-Ordoviciano medio, e quindi solo la formazione delle Arenarie ...
Tópico(s): Geological and Geochemical Analysis
2011 - | Rendiconti online della Società Geologica Italiana
Produção Nacional
Tópico(s): Paleontology and Stratigraphy of Fossils
1986 - | Boletim Técnico Petrobras/Boletim Técnico da Petrobras
... Paleozoico del río Batá comprende filitas del Cambro-Ordoviciano (?), esquistos arcillosos del Devoniano Medio y argilitas cuarcíticas ...
Tópico(s): Water Resource Management and Quality
1958 - | Boletín Geológico
Tópico(s): Paleontology and Stratigraphy of Fossils
1938 - | Revista del Museo de La Plata
Tomás Feininger, Darío Barrero L., Néstor Castro Q.,
... e incluyen shales ligeramente metamorfoseados con graptolites del Ordoviciano cerca a Cristalina y como unidades mayores, esquistos ...
Tópico(s): Environmental and Ecological Studies
1972 - | Boletín Geológico
Jairo Mojica, A Carlos Villarroel,
... metamorfico, constituido por esquistos y filitas del cambro-ordoviciano (o mas antiguas), comparables con la Fm. Silgara ...
Tópico(s): Geological and Tectonic Studies in Latin America
1984 - | Geología Colombiana
Produção Nacional
Revisado por pares
Mário da Costa Campos Neto, Miguel Ângelo Stipp Basei, Sílvio Roberto Farias Vlach, Renaud Caby, Gergely Andrés Julio Szabó, Paulo Vasconcelos,
... e migração de orógenos até o limite Cambro-Ordoviciano. O último evento metamórfico pré-colagem no embasamento ...
Tópico(s): Paleontology and Stratigraphy of Fossils
2004 - UNIVERSIDADE DE SÃO PAULO | Geologia USP Série Científica
Produção Nacional
Carolina Doranti-Tiritan, Peter Christian Hackspacher, Marli Carina Siqueira Ribeiro, Ulrich A. Glasmacher, Daniel Henrique de Souza,
... por rochas cristalinas do Pré-Cambriano e Cambro-Ordoviciano cortados por intrusivas alcalinas do final do período ...
Tópico(s): Geography and Environmental Studies
2014 - União da Geomorfologia Brasileira | Revista Brasileira de Geomorfologia
Oswaldo Siga Júnior, Miguel Ângelo Stipp Basei, J. M. Reis Neto, A. Machiavelli, Ossama Mohamed Harara,
... Neoproterozoic tectonic scheme which continued to the Cambro-Ordoviciano seems to be the result of larger-scale ...
Tópico(s): Geography and Environmental Studies
1995 - | Boletim IG-USP Série Científica
Produção Nacional
This paper describes some volcano-sedimentary deposits that characterize the time interval from Neoproterozoic IE to the early Ordovician, typical of the Borborema Province, Northeast Brazil. They are usually designated molassic deposits and comprise coarse-grained immature rocks with common lateral gradation to pelitic lithologies of continental environments. The volcanism varies, but is mostly acid to intermediate. Two major types of basins may be identified: The first type is connected with the ...
Tópico(s): Geological and Geochemical Analysis
1998 - | Boletim IG-USP Série Científica
Produção Nacional
E. J. Milani, Ubiratan Ferrucio Faccini, Claiton Marlon dos Santos Scherer, Laury Medeiros de Araújo, José Cupertino,
The Paraná Basin, a vast sedimentation area during Paleozoic and Mesozoic times, holds a stratigraphic record ranging in age from late Ordovician to late Cretaceous and comprising six supersequences or unconformity-bounded units (Milani, 1997): Rio Ivai (Ordovician-Silurian), Paraná (Devonian), Gondwana I (Carboniferous-early Triassic), Gondwana II (middle-lateTriassic), Gondwana III (late Jurassic-early Cretaceous), and Bauru (late Cretaceous). Three of them coincide with major Paleozoic transgressive- ...
Tópico(s): Geological formations and processes
1998 - | Boletim IG-USP Série Científica
Mário Luís Assine, CARLOS J. S. ALVARENGA, JOSÉ ALEXANDRE J. PERINOTTO,
PARANÁ BAS1N.The lapó Formation is a thin and widespread unit, generally less than 20 m thick and covering discontinuously an área of hundreds of thousand square kilometers.The main fácies is massivê diamictites, which display pebbles and cobbles in a mud matrix, some of them faceted and striated.The massive diamictites are considered subglacial tillites.The fácies association includes stratified diamictites, conglomerates, massive and stratified sandstones, and fine laminated fácies with dropstones. ...
1998 - Sociedade Brasileira de Geologia | Revista Brasileira de Geociências
Produção Nacional
Mário Luís Assine, Carlos José Souza de Alvarenga, José Alexandre J. Perinotto,
The lapo Formation is a thin and widespread unit, generally less than 20 m thick and covering discontinuously an area of hundreds of thousand square kilometers. The main facies is massive diamictites, which display pebbles and cobbles in a mud matrix, some of them faceted and striated. The massive diamictites are considered subglacial tillites. The facies association includes stratified diamictites, conglomerates, massive and stratified sandstones, and fine laminated facies with dropstones. The ...
Tópico(s): Geology and Paleoclimatology Research
1998 - Sociedade Brasileira de Geologia | Brazilian Journal of Geology
Mário Luís Assine, José Alexandre J. Perinotto, Carlos José Souza de Alvarenga, Setembrino Petri,
The Late Ordovician / Early Silurian Rio Ivai Group is the lowermost stratigraphic cycle at the Brazilian side of the Parana basin and is made up of three formations: Alto Garcas (base), Iapo and Vila Maria. A regional stratigraphic analysis was carried out and new stratigraphic sections were described along the north and northwestern margin of the basin, where the Ordovician / Silurian rocks crops out discontinuously with variable thicknesses. The Rio Ivai Group displays an asymmetrical geometry and ...
Tópico(s): Geography and Environmental Studies
2017 - Sociedade Brasileira de Geologia | Revista Brasileira de Geociências
Produção Nacional
Christie Helouise Engelmann de Oliveira, Andréa Ritter Jelinek,
... Francisco registram os eventos mais antigos, desde o Ordoviciano e o Permiano, respectivamente, que afetaram de modo ...
Tópico(s): Geochemistry and Geologic Mapping
2017 - | Pesquisas em Geociências
Produção Nacional
Andréa Ritter Jelinek, Luiz César Corrêa-Gomes, Marcos Müller Bicca,
... episódio de resfriamento com paleotemperaturas máximas do Cambriano-Ordoviciano, responsável pela erosão de 1600 a 2800 m ...
Tópico(s): Geography and Environmental Studies
2020 - | Pesquisas em Geociências
Carlos Avilés Villarroel, Jairo Mojica,
... sedimentitas fosiliferas del Paleozoico Inferior yen especial del Ordoviciano.
Tópico(s): Geological and Tectonic Studies in Latin America
1988 - | Geología Colombiana
Produção Nacional
Neivaldo Araújo de Castro, Álvaro Penteado Crósta, Francisco José Fonseca Ferreira, Miguel Ângelo Stipp Basei, Maria Elisabete Pascholati,
This paper presents the results of a comparative analysis between litho-structural features observed in LANDSAT-5/TM and aerogeophysical images, in comparison with the regional geological framework of the central portion of the pre-Ordovician basement in the Santa Catarina state (EPOSC), southern Brazil. This is a lithological and structurally complex region, due to the geotectonic evolution of western Gondwana during the Neoproterozoic/Cambrian transition and the break-up of this supercontinent ...
Tópico(s): Geography and Environmental Studies
2003 - Sociedade Brasileira de Geologia | Brazilian Journal of Geology
Produção Nacional
NEIVALDO ARAUJO DE CASTRO, Álvaro Penteado Crósta, Francisco José Fonseca Ferreira, Miguel Ângelo Stipp Basei, Maria Elisabete Pascholati,
This paper presents the results of a comparative analysis between litho-structural features observed in LANDSAT-5/TM and aerogeophysical images, in comparison with the regional geological framework of the central portion of the pre-Ordovician basement in the Santa Catarina state (EPOSC), southern Brazil. This is a lithological and structurally complex region, due to the geotectonic evolution of western Gondwana during the Neoproterozoic/Cambrian transition and the break-up of this supercontinent ...
Tópico(s): Geological and Geophysical Studies
2003 - Sociedade Brasileira de Geologia | Revista Brasileira de Geociências
Produção Nacional
Revisado por pares
Tópico(s): Geography and Environmental Studies
1999 - Brazilian Academy of Sciences | Anais da Academia Brasileira de Ciências
Produção Nacional
Revisado por pares
Lindemberg Lima Fernandes, João Carlos Ribeiro Cruz, Cláudio José Cavalcante Blanco, Ana Rosa Baganha Barp,
... é constituída por rochas sedimentares depositadas desde o Ordoviciano até o Recente que atingem espessuras da ordem ...
Tópico(s): Geophysical and Geoelectrical Methods
2009 - INSTITUTO NACIONAL DE PESQUISAS DA AMAZÔNIA | Acta Amazonica
Produção Nacional
Pedro Henrique Vieira de Luca, Giorgio Basílici, Elson P. Oliveira,
... aberta, estratificacoes cruzadas de tipo hummocky, Formacao Lagarto, Ordoviciano.
Tópico(s): Coastal and Marine Dynamics
2010 - Sociedade Brasileira de Geologia | Brazilian Journal of Geology
Produção Nacional
Pedro Henrique Vieira de Luca, Giorgio Basilici, Elson P. Oliveira,
The Lagarto Formation was interpreted as a depositional system of tidal flat where storm waves and tides controlled the sedimentation. This type of depositional system, which is presently relatively common, but uncommon in the geological record, contains hummocky cross-stratifications (HCS) formed in shallow water. Detailed facies analysis was used to define the physical characteristics of the sediments, a depositional architectural organisation, a depositional model and the controlling factors that ...
Tópico(s): Coastal and Marine Dynamics
2010 - Sociedade Brasileira de Geologia | Revista Brasileira de Geociências
Produção Nacional
Renato Paes de Almeida, Cláudio Riccomini, Liliane Janikian, Antônio Romalino Santos Fragoso-Cesar, Victor Fernandes Velázquez,
The Caacupe Group is composed of sandstones and conglomerates of presumable Ordovician age cropping out in the uplifted areas in the vicinity of the Assuncion Rift, Eastern Paraguay. This group is considered to be the lowermost unit of the Parana Basin, deposited prior to the glaciation registered in the Iapo Formation in Brazil, and thus representing the onset of the Ordovician-Silurian subsidence cycle of the basin. Stratigraphic and facies analyses of representative outcrops of the unit, mainly ...
Tópico(s): Paleontology and Stratigraphy of Fossils
2004 - Sociedade Brasileira de Geologia | Brazilian Journal of Geology
Produção Nacional
DÉBORA LIEMI TANJI, Carolina Zabini, Isabela G. Marques, Kauana Cristina Mazzarelli da Silva,
Tópico(s): Paleontology and Evolutionary Biology
2017 - | Anais do Congresso de Iniciação Científica da Unicamp
... testirnonianze pressoche continue di eventi geologici verificatisi dall’Ordoviciano superiore fino ad oggi, nell’arco cioe_ di ...
Tópico(s): Karst Systems and Hydrogeology
1989 - eScholarship Publishing, University of California | Biogeographia – The Journal of Integrative Biogeography
... paleozoica está representada por rocas metamórficas del Cambro- Ordoviciano y capas no metamórficas del Devoniano, Carboniano y ...
Tópico(s): Water Resource Management and Quality
2016 - Instituto de Investigaciones Marinas y Costeras | Boletín de Investigaciones Marinas y Costeras
... cicios de 2" ordem: OrdovicianoiSiluriano e Devoniano.No Ordoviciano SuperiorlSiluria~o Inferior (Gr.Rio IvaI) foram caracterizadas ...
1997 - | Boletim IG-USP Série Científica
Produção Nacional
Taynara Reges Cardoso, Janaína Cassiano Silva, Guillaume Martins, Consuelo Lima Navarro de Andrade,
... formações Autás-Mirim (arenitos e folhelhos neríticos neo-ordovicianos), Nhamundá (arenitos neríticos e depósitos glaciogênicos do Llandovery ...
Tópico(s): Geography and Environmental Studies
2018 - UNIVERSIDADE FEDERAL DO RIO DE JANEIRO | Anuário do Instituto de Geociências