Claudinei Gouveia de Oliveira

Universidade de Brasília

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Elton Luiz Dantas

Instituto de Geociencias

Roberto Ventura Santos

Universidade de Brasília

Maria Emília Schutesky Della Giustina

Universidade de Brasília

Pedro Cordeiro

Pontificia Universidad Católica de Chile

Márcio Martins Pimentel

Universidade de Brasília

Isabela M. Cordeiro de Sousa

Université du Québec à Montréal

Reinhardt A. Fuck

Universidade de Brasília

Clóvis Vaz Parente

Universidade Federal do Ceará

Bernhard Bühn

Universidade de Brasília

Jaime Estevão Scandolara

Serviço Geológico do Brasil - CPRM

Cooperative Institutions

Universidade de Brasília

Instituto de Geociencias

Serviço Geológico do Brasil - CPRM

Universidade Federal de Ouro Preto

National Council for Scientific and Technological Development

Universidade de São Paulo

Universidade Estadual de Campinas (UNICAMP)

Universidade Federal do Ceará

Instituto Geológico

Universidade Federal do Rio Grande do Sul

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Geoquímica de isótopos de carbono de rochas carbonosos do Quadrilátero Ferrífero, Minas Gerais

Brazilian Journal of Geology (1995)

Roberto Ventura Santos Selma Fernandes Messias Gilmar de Menezes Claudinei Gouveia de Oliveira

O Macico Alcalino de Cananeia e um pequeno stock, de forma elfptica, localizado na cidade homonima, na porcao sul do Estado de Sao Paulo. A analise do padrao de fraturamento do macico indicou a provavel vigencia de duas fases de deformacao, a primeira com extensao NE-SW, de idade cretacea superior, e a segunda, com carater transcorrente sinistrai, de direcao E-W, com compressao NE-SW e extensao NW-SE, de idade paleogenica, provavelmente eocenica. Estas duas fases apresentam relacoes com deformacoes ocorridas ao longo das feicoes tectonicas regionais, estando a primeira fase ligada a extensao ao longo do Alinhamento de Guapiara, que integra o Arco de Ponta Grossa, e a segunda com a transcorrencia sinistrai, de direcao E-W, que propiciou a reativacao cenozoica de antigas zonas de cisalhamento de direcoes ENE-WSW a E-W de idade proterozoica, estas tambem responsaveis pela instalacao e deformacao das bacias que compoem o Rift Continental do Sudeste do Brasil.

10.5327/rbg.v25i2.519

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Citations (1)

THE IGARAPÉ BAHIA CU-AU MINERALIZATION, CARAJÁS PROVINCE

Brazilian Journal of Geology (2000)

Fernando Henrique Bucco Tallarico Claudinei Gouveia de Oliveira Bernardino Ribeiro Figueiredo

The IGARAPE Bahia Cu-Au mineralization is hosted by an Archean, low-grade metavolcano-sedimentary sequence. The orebodies define an ellipsoidal structure and are associated with subvertical breccia units located at the contact between two distinct units of the host sequence. Mineralized breccias include fragments of both footwall and hanging wall, which are cemented by variable amounts of chlorite, siderite, magnetite, chalcopyrite, K-bearing phases and minor U-REE-minerals. Quartz diorite dikes that disrupt the host rocks show a variety of textures, ranging from weakly altered granophyric terms to intensely venulated and brecciated rocks. Hydrothermal alteration of dikes includes propylitization, potassification and local albitization. Based on ore petrology and geochemical data (major elements, REE, oxygen and carbon stable isotopes) it is proposed that the progressive interaction of a hot saline and acid, deep-seated fluid with a low-temperature less saline and oxidizing meteoric solutions is the most likely depositional mechanism of the IGARAPE Bahia mineralization. The resemblance of the alteration styles of mineralized breccias and dioritic dikes suggest that both have interacted with the same hydrothermal fluid. Thus, the dioritic dikes could have been the source of heat and of magmatic fluids during the final stages of epicrustal emplacement.

Breccia

Dike

Diorite

10.5327/rbg.v30i2.800

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Citations (11)

GEOQUÍMICA DE ELEMENTOS TERRAS RARAS DE FLUORITAS DO COMPLEXO CARBONATíTICO DE MATO PRETO, PARANÁ

Revista Brasileira de Geociências (2017)

Roberto Ventura Santos Marcel Augusts Dardenne Claudinei Gouveia de Oliveira

Fluorite deposits in Southern Brazil are usually associated to limestone and granitic rocks. The Mato Preto deposit fluorite is an exception because it occurs associated to carbonatite and alkaline silicate rocks. We discuss the origin of this deposit based on rare earth element (REE) geochemistry and show that fluorite from Mato Preto has an REE spectrum ranging from high to low (La/Lu) n ratios. We suggest that fluorite with high (La/Lu) n are related to the alkaline magmatism, whereas fluorite with intermediate to low (La/Lu) n did not derive from alkaline magmatism, but probably from the country rocks. This interpretation is supported by oxygen, carbon and strontium isotopes that show that the carbonatites are significantly contaminated by their country rocks.

Fluorite

Carbonatite

Rare-earth element

Source

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Citations (3)

Paleoproterozoic (2.26-2.0 Ga) arc magmatism and geotectonic evolution of the Cavalcante-Natividade Block, Central Brazil

Journal of South American Earth Sciences (2025)

André Menezes Sabóia Reinhardt A. Fuck Elton Luiz Dantas Claudinei Gouveia de Oliveira Raphael Teixeira Corrêa

10.1016/j.jsames.2025.105350

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Citations (0)

The São Luís de Montes Belos vermiculite deposit, central Brazil: Hydrothermal mineralization associated with intracontinental strike slip zones

Journal of South American Earth Sciences (2018)

Hammel Assunção Oliver Macedo Maria Emília Schutesky Della Giustina Claudinei Gouveia de Oliveira Igor Fernandes Praxedes

Vermiculite

Ultramafic rock

10.1016/j.jsames.2018.08.012

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Citations (6)

Hydrothermal footprint related to regional-scale shear zone-controlled scheelite mineralization, Seridó W-skarn system, northeastern Brazil

Journal of South American Earth Sciences (2020)

Rodrigo Studart Corrêa Claudinei Gouveia de Oliveira Elton Luiz Dantas Nilson Francisquini Botelho

Amphibole

Scheelite

Diopside

Metasomatism

Titanite

Pyroxene

Actinolite

10.1016/j.jsames.2020.102755

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Citations (6)

GEOCHEMISTRY AND PETROGENESIS OF METAVOLCANIC ROCKS FROM ARCHAEAN GREENSTONE BELTS: RIO MARIA REGION (SOUTHEAST PARÁ, BRAZIL)

Brazilian Journal of Geology (1997)

Zorano Sérgio de Souza Roberto Dall’Agnol Claudinei Gouveia de Oliveira Sérgio Roberto Bacelar Hühn

The Rio Maria region, located at about 250 km south of the Carajas Ridge, is a well preserved typical Archaean (> 2.87 Ga) granite - greenstone terrane. Supracrustal sequences are made up of meta-ultramafic rocks (UM - talc-tremolite schists with relict spinifex textures) at the base, followed by metabasic rocks (BAS – massif basalts with quenched textures; GB - porphyritic gabbros) and, at the top, metadacitic rocks (DAC) with plagioclase, quartz, hornblende and sphene phenocrysts. Terrigenous (graywackes, siltstones) and volcano-chemical metasediments (cherts, iron formations) are intercalated within the basal and intermediate stratigraphic levels. The volcanic rocks define three geochemical series, namely komatiite (UM), low-K tholeiite (BAS, GB) and sodic calc-alkaline (DAC). These series mainly evolved by low pressure fractional crystallization giving respectively olivine + orthopyroxene, clinopyroxene + plagioclase and plagioclase + quartz + alkali feldspar + hornblende + biotite + sphene cumulates. Modeling based on major and REE indicate a Iherzolitic source with 1-5% garnet; the degree of partial melting is from 10 to 25% in order to generate the komatiitic and tholeiitic magmas. The source of dacitic volcanism could be a metasomatised tholeiitic crust transformed into garnet arnphibolite, melted from 10 to 15% and leaving a residue with hornblende, plagioclase, garnet and clinopyroxene. The source types and the trace elements characteristics allow to consider that the magma generated in marginal basins and island arcs geodynamic environments. Consequently, the calc-alkaline magmatism (volcanism at ca. 2.97-2.90 Ga and plutonism at ca. 2.87 Ga) would represent a stage of tectonic stabilization and welding of crustal blocks, forming the continental crust which acted as cratonic basement for the Neoarchaean evolution of the northern portion of the Carajas Mineral Province

Phenocryst

Hornblende

10.5327/rbg.v27i2.585

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Citations (5)

The Fazenda Nova gold deposit, Goiás Magmatic Arc: Late neoproterozoic intrusion-related auriferous mineralization controlled by intracontinental strike-slip faulting

Ore Geology Reviews (2019)

Gustavo Campos Marques Claudinei Gouveia de Oliveira Eugênio Espada Elton Luiz Dantas

Arsenopyrite

Stockwork

Sericite

Dike

Wolframite

Titanite

Argillic alteration

Protolith

10.1016/j.oregeorev.2019.03.012

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Citations (5)

APLICAÇÃO DA GEOFÍSICA AÉREA NA EXPLORAÇÃO MINERAL E MAPEAMENTO GEOLÓGICO DO SETOR SUDOESTE DO CINTURÃO CUPRÍFERO ORÓS-JAGUARIBE

Brazilian Journal of Geology (2003)

Marcus Vinícius Rodrigues Maas Claudinei Gouveia de Oliveira Augusto César Bittencourt Pires Roberto Alexandre Vitória de Moraes

Mineral deposits like those of the Cu-Au-U-ETR-Fe-oxides class are commonly associated with hydrothermal alteration zones that are detectable by airbone geophysical methods. In The Pio IX, Sao Juliao and Fronteiras region (Piaui State), and Campos Sales region (Ceara State) there are copper occurrences in Eo-cambrian molassic basins, and others associated with fault breccias in hydrothermal alteration zones due to Post-Brasiliano granites (550 My) intruded in Mesoproterozoic ortogneisses and metavolcanic rocks of the Oros Group. This region is covered by the airbone geophysical survey called “Projeto Borda Leste da Bacia do Maranhao” (Magnetometry and Gammaspectrometry with flight line spacing of 1 km). The processing and interpretation of these data are presented here, with an aim to help geological mapping and mineral exploration. The magnetic images of anomalous field, first vertical derivative, analytical signal amplitude and phase, and 3D Euler deconvolution maps were used to delineate the structural framework and the magnetic domains. The RGB ternary image (K:Th:U) was used to delineate the gamma-spectrometric domains. The integration of the magnetic and gamma-spectrometric interpretation yielded a geological-geophysical map. The anomalous potassium and uranium images were used to identify probable zones of potassic hydrothermal alteration that suggest targets for future follow-up.

Magnetic survey

Geologic map

10.5327/rbg.v33i3.1074

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Citations (6)

A thematic issue dedicated to the 50th year of the discovery of the Carajás Mineral Province

Ore Geology Reviews (2020)

Maria Emília Schutesky Della Giustina Claudinei Gouveia de Oliveira Steffen Hagemann Lena Virgínia Soares Monteiro

Ultramafic rock

Greenstone belt

Adakite

Felsic