Results 171 to 180 of about 62,283 (208)

Crustal thickness estimation and tectonic analysis of the Amazonian Craton from gravity data

Journal of South American Earth Sciences, 2021
Abstract The crustal thickness in South America has been mostly determined using seismological techniques. However, because these techniques provide point constraint or profile-specific results, the crustal thickness maps become especially dependent on both the number and spatial distribution of seismological stations.
Yellinson de Moura Almeida, Giuliano Sant’Anna Marotta, George Sand França, Roberta Mary Vidotti, Reinhardt Adolfo Fuck   +4 more
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The Rondonian-San Ignacio Province in the SW Amazonian Craton: An overview

Journal of South American Earth Sciences, 2010
Abstract The Rondonian-San Ignacio Province (1.56–1.30 Ga) is a composite orogen created through successive accretion of arcs, ocean basin closure and final oblique microcontinent–continent collision. The effects of the collision are well preserved mostly in the Paragua Terrane (Bolivia and Mato Grosso regions) and in the Alto Guapore Belt and the ...
Bettencourt, Jorge Silva, Leite, Washington Barbosa, Ruiz, Amarildo Salina, Matos, Ramiro, Payolla, Bruno Leonelo, Tosdal, Richard M.   +5 more
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Petrology and crustal evolution of the Tartarugal Grande Granulitic Complex - Northeastern Amazonian Craton

Journal of South American Earth Sciences, 2021
Abstract The Tartarugal Grande Complex (TGC) is an association of high-grade metamorphic rocks with Archean and Paleoproterozoic protoliths, located at the border of the Archean Amapa and Rhyacian Lourenco domains, in southeastern Guiana Shield, northeast of the Amazonian Craton.
Paulo Sergio de Sousa Gorayeb, Hanna Paula Sales Paiva, Jean-Michel Lafon, Lúcia Travassos Rosa-Costa, Elton Luiz Dantas   +4 more
openaire   +1 more source

Geochronology of the Archean Tumucumaque Complex, Amapá Terrane, Amazonian Craton, Brazil

Journal of South American Earth Sciences, 2018
Abstract U-Pb and Lu-Hf isotopic studies were performed in igneous zircon crystals from orthogneisses, metagranodiorites and a gabbro of the Tumucumaque Complex, in Vila Nova region, south of Amapa state, Brazil. The complex is located in the southeastern region of the Guyana Shield, northeastern portion of the Amazonian Craton.
Cristiano Borghetti, Ruy P. Philipp, Persio Mandetta, Itiana B. Hoffmann   +3 more
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Organic matter in the Neoproterozoic cap carbonate from the Amazonian Craton, Brazil

Journal of South American Earth Sciences, 2016
Abstract Bitumen found in Neoproterozoic carbonates from the southern Amazonian Craton, Brazil, represents a great challenge for its geochemical characterization (origin, thermal maturity and the degree of preservation) within a context of petroleum system.
Gustavo R. Sousa Júnior, Afonso C.R. Nogueira, Eugênio V. Santos Neto, Candido A.V. Moura, Bruno Q. Araújo, Francisco de A.M. Reis   +5 more
openaire   +1 more source

The Archean granulite-enderbite complex of the northern Carajás province, Amazonian craton (Brazil): Origin and implications for crustal growth and cratonization

Lithos, 2019
Abstract The central portion of the Canaa dos Carajas domain (Ouro Verde area) exhibits a peculiar scenario involving two units of orthopyroxene-bearing sodic rocks: (i) the Mesoarchean Ouro Verde felsic granulite with protolith crystallization and metamorphism ages of 3.05–2.93 Ga and 2.89–2.84 Ga, respectively, and (ii) the Neoarchean Cafe ...
Bhrenno Marangoanha, Davis Carvalho de Oliveira, Roberto Dall’Agnol   +2 more
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From Mesoarchean drips to modern–style tectonics in the Carajás Province, Amazonian Craton

Journal of South American Earth Sciences, 2020
Abstract The beginning of modern–style plate tectonics on Earth is not a consensus, but many authors suggest that it happened transitionally, from 3.2 to 2.5 Ga. In the Amazonian Craton, Brazil, the contrasting crustal architecture of the Rio Maria and the Carajas domains is marked by dome–and–keel and linear belt, respectively, which may represent a
Felipe Grandjean da Costa, Patrick Araújo dos Santos, Isabelle Cavalcanti Corrêa de Oliveira Serafim, Iago Sousa Lima Costa, Sherissa Roopnarain   +4 more
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THE MESOPROTEROZOIC MUCAJAI ANORTHOSITE - MANGERITE - RAPAKIVI GRANITE COMPLEX, AMAZONIAN CRATON, BRAZIL

The Canadian Mineralogist, 2009
The Mesoproterozoic Mucajai anorthosite – mangerite – rapakivi granite (AMG) complex, in northern Brazil, comprises rapakivi granites, fayalite–pyroxene quartz mangerite and syenite, and a massif-type anorthosite forming an asymmetrically zoned igneous complex without counterpart in the Amazonian craton.
L. M. B. Fraga, R. Dall'Agnol, J. B. S. Costa, M. J. B. Macambira   +3 more
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Fissural mafic magmatism on southwestern Amazonian Craton: Petrogenesis and 40Ar-39Ar geochronology

Journal of South American Earth Sciences, 2019
Abstract Expressive occurrences of sills and mafic dyke swarms as a result of tafrogenetic processes that led to break-up or attempted break-up of continental crust are found on the south and southwestern Amazonian Craton. This work focus on the magmatic-tectonic processes that formed the Salto do Ceu, Huanchaca, and Rancho de Prata suites. The Salto
Gabrielle Aparecida Lima, Moacir José Buenano Macambira, Maria Zélia Aguiar Sousa, Amarildo Salina Ruiz, Manoel Souza D'Agrella-Filho   +4 more
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The Roraima Alkaline Province: A cretaceous alkaline province in the Amazonian Craton

Geochemistry, 2022
Raisa Fagundes de Figueiredo, Rogério Guitarrari Azzone, Ticiano José Saraiva dos Santos   +2 more
openaire   +1 more source