Results 21 to 30 of about 3,579 (174)

Correlations of some Neoproterozoic carbonate-dominated successions in South America based on high-resolution chemostratigraphy [PDF]

open access: yes, 2016
Esta revisão incorpora novos dados isotópicos e químicos para correlação quimioestratigráfica de sucessões, predominantemente carbonáticas, na América do Sul (Argentina, Bolívia, Brasil, Paraguai e Uruguai).
Alvarenga, Carlos José Souza de   +13 more
core   +2 more sources

U–Pb and Sm–Nd geochronology of amphibolites from the Curaçá Belt, São Francisco Craton, Brazil : tectonic implications [PDF]

open access: yes, 2007
The Curaçá terrane is part of the Itabuna–Salvador–Curaçá (I–S–C) Paleoproterozoic orogen in the São Francisco craton, northeastern Brazil, and comprises supracrustal rocks, gneisses of their probable basement, amphibolites, and mafic-ultramafic Cu ...
Dantas, Elton Luiz   +4 more
core   +1 more source

Evidence of Paleoproterozoic phosphogenesis in the Salvador-Curaçá Orogen (Tanque Novo-Ipirá Complex), northeastern São Francisco Craton, Brazil

open access: yesBrazilian Journal of Geology, 2021
This paper analyzes mineralogical, geochemical, and geochronological aspects, along with the effect of hydrothermal/metasomatic overprints, to identify the presence of primary phosphate as well as depositional and paleoenvironmental conditions in marble ...
Tatiana Silva Ribeiro   +5 more
doaj   +1 more source

New insights from low-temperature thermochronology into the tectonic and geomorphologic evolution of the south-eastern Brazilian highlands and passive margin [PDF]

open access: yes, 2019
The South Atlantic passive margin along the south-eastern Brazilian highlands exhibits a complex landscape, including a northern inselberg area and a southern elevated plateau, separated by the Doce River valley.
De Grave, Johan   +4 more
core   +2 more sources

Origin and metamorphism of graphite from Formiga, Minas Gerais (Brazil)

open access: yesBrazilian Journal of Geology, 2021
During the Paleoproterozoic Era, the Brazilian cratons experienced orogenic events that modified the archean basement and sedimentary successions. In the southern São Francisco Craton, it can be recognized evidence of an orogenic event that happened ...
Luiza Carneiro de Rezende   +2 more
doaj   +1 more source

The 2-Ga peraluminous magmatism of the Jacobina-Contendas Mirante belts (Bahia, Brazil) : geologic and isotopic constraints on the sources [PDF]

open access: yes, 1990
L'étude pétrographique des intrusions granitiques du craton Sao Francisco (Bahia, Brésil) permet de définir la chronologie absolue des épisodes magmatiques et d'identifier les sources magmatiques ainsi que les processus géodynamiques se produisant lors ...
Caen-Vachette, M.   +3 more
core   +1 more source

As sucessões carbonáticas neoproterozóicas do Cráton do São Francisco e os depósitos de fosfato: correlações e fosfogênese [PDF]

open access: yes, 2007
Neoproterozoic Carbonate Sequences of the São Francisco Craton and the Phosphate Deposits: Correlation and Phosphogenesis. The neoproterozoic carbonate successions of the São Francisco craton are formed by thick carbonate and siliciclastic strata ...
Azmy, Karem   +3 more
core   +1 more source

Geoquímica e geocronologia da Suíte Paciência: implicações para o fim da evolução riaciana do Bloco Itacambira-Monte Azu

open access: yesGeologia USP. Série Científica, 2018
Diversos corpos plutônicos alcalinos de alto potássio paleoproterozoicos ocorrem no embasamento do cráton São Francisco, bem como no embasamento dos orógenos que o bordejam. Localizado no bordo oeste do cráton São Francisco, o bloco Itacambira-Monte Azul
Samuel Moreira Bersan   +3 more
doaj   +1 more source

Malignant melanoma of the urethra: a rare histologic subdivision of vulvar cancer with a poor prognosis [PDF]

open access: yes, 2012
Malignant melanoma of the urethra is a rare tumour that is difficult to diagnose and treat, resulting in a poor prognosis. In this paper, we present the case of a 65-year-old woman who was referred to a gynaecologist because of a urethral mass that ...
Alkatout, Ibrahim   +8 more
core   +2 more sources

Structural analysis of the Rio Preto fold belt (northwestern Bahia / southern Piauí), a doubly-vergent asymmetric fan developed during the Brasiliano Orogeny

open access: yesAnais da Academia Brasileira de Ciências, 2014
The Rio Preto fold belt borders the northwestern São Francisco craton and shows an exquisite kilometric doubly-vergent asymmetric fan structure, of polyphasic structural evolution attributed exclusively to the Brasiliano Orogeny (∼600-540 Ma).
FABRÍCIO A. CAXITO   +6 more
doaj   +1 more source

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