O Greenstone Belt Sapucaia, Município de Água Azul do Norte, Província Carajás: caracterização petrográfica e geoquímica e implicações metalogenéticas

Sousa, S. D.

doi:10.11606/d.44.2014.tde-26092014-095956

Cited by 4 publications

(5 citation statements)

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“…Other microbasins, located in the Carajás basin, where metamafic volcanic rocks dominate, also showed significant values, particularly during the rainy season. Finally, in the southern portion of the basin, in the Canaã dos Carajás, Sapucaia and Rio Maria domains, there is enrichment in these elements associated with the metamafic-ultramafic rocks of the Sapucaia greenstone belt [59] and in the vicinity of the city of Canaã dos Carajás, where the red Ni mineral deposit is found, associated with a mafic-ultramafic body. Although the mentioned areas have presented relative enrichment in these elements, concentrations above the MPV of CONAMA 357 were not verified in any of the sampled watersheds.…”

Section: Influence Of Lithology Vs Anthropic Effects On Water Geochem...mentioning

confidence: 97%

Source Apportionment of Chemical Elements and Their Geochemical Baseline Values in Surface Water of the Parauapebas River Basin, Southeast Amazon, Brazil

et al. 2022

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The present work aims to evaluate the chemical quality and establish the geochemical baseline values of elements in the surface waters of the Parauapebas River basin (PRB), which is one of the major subbasins in the Itacaiúnas River watershed (IRW) located in the Brazilian Amazon. A total of 327 surface water samples were collected during the rainy and dry seasons in 2017. Results indicate that waters are slightly acidic to alkaline (pH 6 to 8), and there was a strong influence of the seasonal variation on water quality, with higher values of turbidity, Fe, Al, Mn, TDS, etc. in the rainy season. Two geochemical baseline types for the PRB were defined, i.e., ‘conservative baseline’ (CB), represented by the cumulative frequency curve, and the ‘environmental baseline’ (EB), comprising the sum of natural and diffuse anthropogenic contributions, represented by the 98th percentile. Except Fe, Mn and Al, the CB and EB values of various trace elements (Ba, Co, Cr, Cu, Ni, Rb, Sn, Sr, Ti, V and Zn) were lower than the recommended limits of CONAMA 357/05—class 2. The principal component analysis (PCA) identified the major geochemical association (Al-Ti-Cu-Cr-Ni-V), which is an imprint of the local geological setting. Ni and Cr showed enrichment at sites where mafic and ultramafic rocks are concentrated, while Cu concentration is mainly associated with the north and south mineralization belts. High concentrations of Fe and Mn are characteristic of the waters of this region and this is mostly influenced by specific land use activities and intense weathering/erosion of catchment materials. At the upper Parauapebas, anthropogenic contributions associated with soil use and occupation were also important along with the geogenic effects. The obtained results regarding sources of contaminants in some microbasins can be taken as a starting point for future studies on the environmental quality of the region’s water resources.

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Section: Influence Of Lithology Vs Anthropic Effects On Water Geochem...mentioning

confidence: 97%

Source Apportionment of Chemical Elements and Their Geochemical Baseline Values in Surface Water of the Parauapebas River Basin, Southeast Amazon, Brazil

et al. 2022

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“…The province of Carajás and the southern part of the basin are occupied by the Archean Rio Maria, Sapucaia and Canaã dos Carajás domains, which consist of granitoid rocks with diverse compositions and subordinate metamorphic-ultramafic greenstone belts. The eastern portion of the BHRI is represented by the Araguaia Belt, which contains sedimentary, metasedimentary, and mafic-ultramafic rocks and quaternary deposits and lateritic coverings (Dall'Agnol et al, 2017;Feio et al, 2013;Monteiro et al, 2008;Sousa et al, 2015, Sahoo et al, 2019.…”

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confidence: 99%

Comparison of sediment rating curves and sediment yield in subbasins of the Itacaiúnas River Watershed, Eastern Amazon

Silva

Cavalcante

Filho

et al. 2021

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Understanding the hydrosedimentological dynamics of tropical rivers is a challenge in the Amazon due to its remote and difficult-to-access areas. This study was based on data collected from 16 hydrosedimentological control sections in the 6 subbasins that make up the Itacaiúnas River Watershed (IRW), with 4 annual campaigns (high water levels, rising water levels, falling water levels, low water levels) between 2015 and 2019, with the aim of constructing and comparing sediment rating curves and sediment yield. The data at the mouth of the IRW revealed that the rainy season is responsible for 93% of liquid discharges (Q) with an average of 1460.88 m3/s and for 98% of suspended sediment discharges (SSQ) with an average of 5864.15 tons/day. Suspended sediment concentrations (SSCs) are low to moderate (50 to 150 mg/l). The curves encompassing all the data showed R2 values (0.92 to 0.99) greater than the curves with only the values of the rainy or dry season, indicating a good fit of the power equation to the SSQ and Q data for all sections studied. Higher values of coefficients a and b show areas of greater sediment production and deforestation, as well as areas with new sources of sediment and preserved forest.

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“…Alteração blackwall foi descrita previamente na Província Carajás nas rochas do Greenstone Belt Sapucaia, em sua área tipo, próximo ao limite entre os domínios Rio Maria e Carajás (Sousa 2014;Sousa et al 2015). De acordo com esses autores, processos As assembleias dos minerais de alteração hidrotermal relativamente mais frias e tardias se localizam próximas às regiões da mineralizações.…”

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O depósito de óxido de ferro-cobre-ouro de Bacuri, Província Carajás, Pará: implicações de processos metassomáticos em rochas metaultramáficas para a evolução do sistema hidrotermal

Marques¹

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AgradecimentosAgradeço primeiramente a Deus por me dar o privilégio de estudar geologia. Apenas nessa profissão podemos estudar diretamente Sua obra. Olhar para as rochas é olhar para a sombra de Deus.A minha família, aos meus pais Paulo e Ana Maria, e aos meus irmãos, Luísa e Tiago.Apesar das constantes cobranças em relação ao meu prazo de entrega, agradeço pelo incentivo e apoio.Aos meus amigos e colegas do banco do saguão. Sem eles provavelmente teria terminado esta dissertação em um prazo muito mais curto. Por outro lado, eu não teria o mesmo gosto pela vida acadêmica, muito provavelmente nem teria seguido esse caminho sem eles. A Isaac Jamil Sayeg pela atenção e pelo dia de muito trabalho e esforço ao MEV (com direito a hora extra). Os resultados obtidos nesse dia foram fundamentais para a elaboração desta dissertação. Aos meus colegas de pós-graduação daAo professor Rainer Aloys Schultz-Güttler pelo incentivo em continuar na área acadêmica.Ao professor Johann Hans Daniel Schorscher pelas aulas de "Petrogênese, metalogênese e evolução crustal de terrenos arqueanos e paleoproterozóicos ". Sem essas aulas, muitas ideias aqui apresentadas nessa dissertação não teriam sequer sido cogitadas. Ao professores responsáveis pelas disciplinas da área de geologia econômica CaetanoJuliani, Gustavo Correa de Abreu e João Batista Moreschi. Trabalhar nessas disciplinas como monitor, além de uma honra, foi uma grande oportunidade de aprendizado. Aos dois últimos agradeço também pelas valorosas colocações realizadas durante meu exame de qualificação. et al. 2010). Abreviações: Ab = Albita; Act = Actinolita; Ap = Apatita; Au = Ouro Nativo; Bo = Bornita; Bt = Biotita; Cal = Calcita; Chl = Clorita; Cpy = Calcopirita; Hm = Hematita; Mi = Millerita; Mt = Magnetita; Po = Pirrotita; Py = Pirita; Sie = Siegenita; Sp = Esfalerita. como peça chave para a descoberta de novos depósitos nessa importante província mineral. XXXVI AbstractThe Bacuri deposit is hosted by rocks derived from volcanic and intrusive igneous protoliths, with widely contrasting chemical characteristics, from ultramafic to felsic composition. The metavolcanic host rocks may be related to remnants of Mesoarchean greenstone belts. The metavolcanic rocks, including those of metaultra mafic character The recognition and the detailed study of the processes and products generated by metasomatic and hydrothermal alteration events are fundamental to understand the genesis of copper deposits in Carajás Province. The advancement in this field of geological knowledge may be a key factor to discovery new deposits in this important mineral province. outros depósitos (e.g., Castanha, Bacaba, Jatobá e Visconde) em avaliação pela VALE.Importantes avanços no conhecimento dos depósitos cupro-auríferos do Cinturão Sul do Cobre da Província Carajás têm sido alcançados. Entre esses avanços, inclui-se a proposição de modelos descritivos, nos quais é identificada: associação do minério com extensas zonas de alteração hidrotermal alcalina (sódica e/ou potássica); enriquecimento em ETR...

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O Greenstone Belt Sapucaia, Município de Água Azul do Norte, Província Carajás: caracterização petrográfica e geoquímica e implicações metalogenéticas

Abstract: SÃO PAULO 2014Autorizo a reprodução e divulgação total ou parcial deste trabalho, por qualquer meio convencional ou eletrônico, para fins de estudo e pesquisa, desde que citada a fonte.

Cited by 4 publications

References 33 publications

Source Apportionment of Chemical Elements and Their Geochemical Baseline Values in Surface Water of the Parauapebas River Basin, Southeast Amazon, Brazil

Source Apportionment of Chemical Elements and Their Geochemical Baseline Values in Surface Water of the Parauapebas River Basin, Southeast Amazon, Brazil

Comparison of sediment rating curves and sediment yield in subbasins of the Itacaiúnas River Watershed, Eastern Amazon

O depósito de óxido de ferro-cobre-ouro de Bacuri, Província Carajás, Pará: implicações de processos metassomáticos em rochas metaultramáficas para a evolução do sistema hidrotermal

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