Results 51 to 60 of about 42,196 (220)

Near‐Synchronous Cambrian Evolution of the Transbrasiliano‐Kandi‐4°50′ Shear Zone in South America and Africa

Terra Nova, EarlyView.
ABSTRACT The Transbrasiliano‐Kandi‐4°50′ (TK4) shear zone in western Gondwana crosscuts South America and NW Africa for at least 6000 km. Despite its impressive size, the timing of the main episode of dextral ductile shearing is uncertain. We present detailed in situ multi‐mineral geochronology of mylonites from both Brazil and Algeria supporting that ...
F. A. Caxito, B. V. Ribeiro, F. Alkmim, A. Deramchi, C. L. Kirkland   +4 more
wiley   +1 more source

2.13 Ga Lawsonite/Barroisite-Bearing E-Morb Signature Metagabbro Associated with Spinel Metaperidotite from Itaguara (São Francisco Craton, Brazil): Oldest Blueschist-Facies Fragment of Oceanic Moho?

Earth and Planetary Science
In close association with Paleoproterozoic retroeclogite and accretionary prism-related mica-quartz schist, a 2.13 Ga (metamorphic titanite U-Pb age) lawsonite/barroisite-bearing E-MORB signature metagabbro associated with spinel metaperidotite is found ...
Alexandre De Oliveira Chaves
semanticscholar   +1 more source

Unsupervised drill core pseudo-log generation in raw and filtered data, a case study in the Rio Salitre greenstone belt, São Francisco Craton, Brazil

Journal of Geochemical Exploration, 2021
We use in situ portable X-Ray Fluorescence data acquired in sawn drill core samples of rocks from the Sabiá prospect, at the Rio Salitre greenstone belt, São Francisco Craton Brazil, for pseudo-log automatic generation through running unsupervised ...
Guilherme Ferreira da Silva, J. H. Larizzatti, Anderson Dourado Rodrigues Silva, C. Lopes, E. Klein, Kotaro Uchigasaki   +5 more
semanticscholar   +1 more source

The Role of Gene Flow in the Diversification of the Monkey Treefrog Complex Across the South American Dry Diagonal

Zoologica Scripta, EarlyView.
ABSTRACT Understanding Neotropical megadiversity remains challenging due to fundamental taxonomic issues, including identifying and describing cryptic species and their distribution, and the limited knowledge of key factors driving biological diversification. Such challenges are especially prominent in diverse clades with high levels of cryptic species,
Felipe Camurugi, Vinícius A. São Pedro, Felipe Magalhães, Marcelo Gehara, Eliana F. Oliveira, Gabriel C. Costa, Frank T. Burbrink, Edward A. Myers, Guarino R. Colli, Miguel T. Rodrigues, Adrian A. Garda   +10 more
wiley   +1 more source

The Tectonic interaction between the Paramirim Aulacogen and the Araçuaí Belt, São Francisco craton region, Eastern Brazil

Anais da Academia Brasileira de Ciências, 2006
The Paramirim aulacogen, hosted in the northern part of the São Francisco craton, corresponds to two superimposed and partially inverted rifts of Paleo and Neoproterozoic ages.
Simone C.P. Cruz, Fernando F. Alkmim
doaj   +1 more source

Geochemical and isotopic evidence for the petrogenesis and emplacement tectonics of the Serra dos Orgaos batholith in the Ribeira belt, Rio de Janeiro, Brazil [PDF]

, 2016
International audienceThe Serra dos Orgaos batholith in the State of Rio de Janeiro (Brazil) is a NE-SW-trending elongated body that occupies ca. 5000 km(2) in plan view.
Machado, Rômulo, Mcreath, Ian, Peucat, Jean-Jacques, Phillip, Ruy Paolo   +3 more
core   +2 more sources

Geological and isotopic characteristics of granites from the Western Pernambuco-Alagoas Domain: implications for the crustal evolution of the Neoproterozoic Borborema Province

Brazilian Journal of Geology
The Western Pernambuco-Alagoas Domain is a complex tectonic domain of the Southern part of the Neoproterozoic Borborema Province. It borders the Northern margin of São Francisco Craton. U-Pb and Sm-Nd data discussed in this work show that, in the Western
Rodrigo Fabiano da Cruz, Márcio Martins Pimentel, Ana Cláudia de Aguiar Accioly, Joseneusa Brilhante Rodrigues   +3 more
doaj   +1 more source

Toward an integrated model of geological evolution for NE Brazil-NW Africa: The Borborema Province and its connections to the Trans-Saharan (Benino-Nigerian and Tuareg shields) and Central African orogens

Brazilian Journal of Geology, 2020
Both the Borborema Province of NE Brazil and the geological provinces of NW Africa (the Trans-Saharan Orogen consisted of the Tuareg and Benino-Nigerian shields and the Central African Orogen of Cameroon, Chad, and Central African Republic) are complex ...
Fabrício de Andrade Caxito, Lauro Cézar Montefalco de Lira Santos, Carlos Eduardo Ganade, Abderrahmane Bendaoud, El-Hocine Fettous, Merlain Houketchang Bouyo   +5 more
doaj   +1 more source

ITAPECERICA METAMAFIC-ULTRAMAFIC ROCKS WITH E-MORB SIGNATURE: OPHIOLITIC REMNANTS OF THE RHYACIAN-OROSIRIAN OROGENY IN SOUTHERN SÃO FRANCISCO CRATON?

Geosciences = Geociências, 2021
In the Southern São Francisco Craton near Itapecerica (Minas Gerais – Brazil) occurs a supracrustal succession of rocks, varying from bottom to top by quartzite, graphite schist, khondalitic paragneiss and banded iron formation whose protoliths are from ...
D. A. Miranda, A. O. Chaves
semanticscholar   +1 more source

Tectonic evolution of the Dom Feliciano Belt in Southern Brazil : geological relationships and U-Pb geochronology [PDF]

, 2016
O Cinturão Dom Feliciano, que se estende desde o leste do Uruguai até o sul do Brasil, representa um importante orógeno Neoproterozoico formado pela colagem de domínios oceânicos e fragmentos continentais entre os crátons Rio de La Plata, Congo e ...
Chemale Jr, Farid, Philipp, Ruy Paulo, Pimentel, Marcio Martins   +2 more
core   +2 more sources