21 documents found, page 1 of 3
Vestiges of a continental margin ophiolite type in the Novo Oriente region, Bor...
Pitombeira, João Paulo Araújo; Amaral, Wagner da Silva; Uchôa Filho, Evilarde Carvalho; Fuck, Reinhardt Adolfo; Dantas, Elton Luiz; Parente, Clóvis VazThe Novo Oriente Group is a restricted well-preserved metasedimentary sequence, composed of two tectonic-stratigraphic sequences in the southwestern portion of the Cear a Central Domain, NE Brazil. The Bonsucesso Formation comprises mainly quartzite and metamafic rocks and the Caraúbas Formation is dominantly metapelitic, with chemical sedimentary contribution, metamafic and metaultramafic rocks. New integrated...
Geochemical and detrital zircon geochronological investigation of the metavolca...
Lima, Haroldo Monteiro; Pimentel, Márcio Martins; Fuck, Reinhardt A.; Santos, Lauro Cézar Montefalco de Lira; Dantas, Elton LuizThe Borborema Province is an important Precambrian orogenic system in Northeastern Brazil. It was formed during the assembly of Western Gondwana in the Brasiliano-Pan-African Orogeny. The Neoproterozoic Sergipano Belt is part of the Province and occupies a large area of its southern portion. Investigation of provenance and tectonic environment of the metavolcanic-sedimentary complexes in this belt are of region...
Early to Late Paleoproterozoic magmatism in NE Brazil: The Alto Moxotó Terrane ...
Santos, Lauro Cézar Montefalco de Lira; Dantas, Elton Luiz; Santos, Edilton José dos; Santos, Roberto Ventura; Lima, Haroldo MonteiroThe Alto Moxotó Terrane is a Paleoproterozoic inlier within the Transversal Domain of the Neoproterozoic Borborema Province (NE Brazil). An isotopic and whole-rock geochemistry study has been performed in the Sucuru region (Paraiba State, NE Brazil) which revealed a long-lived evolution for this terrane. The first event is Siderian-aged, dated on 2.44 Ga, being represented by granitic to granodioritic banded or...
Análise estrutural e metamórfica da região de Sucuru (Paraíba): implicações sob...
Santos, Lauro Cézar Montefalco de Lira; Santos, Edilton José dos; Dantas, Elton Luiz; Lima, Haroldo MonteiroInserted on the Alto Moxotó Terrane of the Borborema Province, the Sucuru region (Paraíba state, Brazil) includes two dominantly pre-Ediacaran tectono-stratigraphic domains, bounded by an expressive thrust shear zone (Carmo SZ). The first domain has a metaplutonic nature, being formed by granodioritic to migmatitic orthogneisses (Floresta Complex) cut by several intrusive suites. These suites comprise a unit of...
New U-Pb (SHRIMP) and first Hf isotope constraints on the Tonian (1000-920 Ma) ...
Caxito, Fabrício de Andrade; Santos, Lauro Cézar Montefalco de Lira; Uhlein, Alexandre; Dantas, Elton Luiz; Alkmim, Ana RamalhoOrthogneisses associated with metavolcanosedimentary successions related to the 1000 – 920 Ma Cariris Velhos event occur mainly in a ca. 700 km-long sigmoidal-shaped belt that crosscuts the Transversal Zone of the Borborema Province and extends to the fold belts located in its southern or external zone (part of the Riacho do Pontal and Sergipano orogens). Despite its importance, the tectonic setting and the rol...
The Barreiro suite in the central Ribeira Belt (SE-Brazil) : a late tonian thol...
Heilbron, Monica; Oliveira, Caroline; Lobato, Marcela; Valeriano, Claudio de Morisson; Dussin, Ivo; Dantas, Elton Luiz; Simonetti, AntonioNew geochemical, U-Pb, Lu-Hf and Sr-Nd data from the Barreiro Suite metabasites in comparison with enclaves within the distal Andrelândia Group and the orthogranulites of the Juiz de Fora Complex are presented. Geochemical data suggest intraplate setting, with high and low-TiO 2 , TDM Nd ages between 1.80 and 1.41 Ga, negative ΕNd t and ( 87 Sr/ 86 Sr)i between 0.714 and 0.747. Results contrast with part of the...
Thermochronology and exhumation history of the basement and sediments of the NN...
Resende, Rosana Silveira [UNESP]; Tello Sáenz, Carlos Alberto [UNESP]; Dantas, Elton Luiz; Hackspacher, Peter Christian [UNESP]Made available in DSpace on 2020-12-12T02:34:52Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-04-01; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Combined zircon fission-track (FT) and U–Pb dating were used to obtain correlated cooling ages and tectonic processes in the eastern border of the Phanerozoic Paraná Basin, a large cratonic sedimentary basin in South America deposited over P...
Ediacaran emerald mineralization in Northeastern Brazil : the case of the Fazen...
Santiago, Judiron Santos; Souza, Valmir da Silva; Dantas, Elton Luiz; Oliveira, Claudinei Gouveia deThe Fazenda Bonfim emerald deposit lies within the Seridó Belt. It is a classic example of deposit formed through metasomatic interactions between Be-rich granite intrusions and Cr(± V)-rich mafic-ultramafic rocks. The setting of the emerald mineralization was built under strong strike-slip dynamics, which produced serpentinization and talcification of mafic-ultramafic host-rocks, and was followed by syn-kinema...
The effect of chemical and physical imperfections in zircon grains in influenci...
Resende, Rosana Silveira [UNESP]; Tello Sáenz, Carlos Alberto [UNESP]; Pereira, Luiz Augusto Stuani [UNESP]; Dantas, Elton LuizMade available in DSpace on 2019-10-06T15:50:52Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-12-15; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Understanding the chemical etching effects in the crystalline structure of zircon grains is crucial to know their chemical composition, morphology and isotopic geochemistry. After chemical etching, the zircon grain can be classified as homog...
Geocronologia e aspectos estruturais e petrológicos do Pluton Bravo, Domínio Ce...
Lages, Geysson de Almeida; Marinho, Marcelo de Souza; Nascimento, Marcos Antonio Leite do; Medeiros, Vladimir Cruz de; Dantas, Elton LuizO Pluton Bravo (no Estado da Paraíba) constitui um stock elipsoidal formado por monzo/sienogranitos porfiríticos, enclaves dioritos e zonas híbridas. Está intrudido em gnaisses migmatíticos paleoproterozoicos do Domínio Central da Província Borborema. Os sienogranitos são metaluminosos a levemente peraluminosos, e exibem altas razões de K2O/Na2O > 1,5 e FeOt/(FeOt + MgO) > 0,86. Os dioritos possuem alto conteúd...