Newton Souza Gomes

Universidade Federal de Ouro Preto

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José Alexandre de Jesus Perinotto

Universidade Estadual Paulista (Unesp)

Angélica Fortes Drummond Chicarino Varajão

Universidade Federal de Ouro Preto

Luciana Andrade Reis

Fundação Gorceix

César Augusto Chicarino Varajão

Universidade Federal de Ouro Preto

Alessandro Batezelli

Universidade Estadual de Campinas (UNICAMP)

Marcelo A. Martins-Neto

Universidade Federal de Ouro Preto

João F. Suss

Elabora Consultoria (Brazil)

Luciano Fernandes Germano

Universidade Federal de Ouro Preto

Hanna Jordt Evangelista

Universidade Federal de Ouro Preto

Edgar Batista de Medeiros Júnior

Universidade Federal de Viçosa

Cooperative Institutions

Universidade Federal de Ouro Preto

Instituto de Geociencias

Museu de Ciências Naturais da Fundação Zoobotânica do Rio Grande do Sul

Fundação Gorceix

Universidade Federal de Mato Grosso

Escola Superior de Ciências da Saúde

Instituto Federal de Educação, Ciência e Tecnologia de Minas Gerais

João Pinheiro Foundation

Petrobras (Brazil)

Universidade Estadual Paulista (Unesp)

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PETROGRAFIA E DIAGÊNESE DA FORMAÇÃO UBERABA, CRETÁCEO SUPERIOR DA BACIA DO PARANÁ NO TRIÂNGULO MINEIRO

Revista Brasileira de Geociências (1999)

Paulo Dias Ferreira Júnior Newton Souza Gomes

The paper characterizes the depositional model and the diagenetic evolution of the Uberaba Formation, the lowermost unit of Bauru Group, Upper Cretaceous of the Paraná Basin. The Uberaba Formation is geographically restricted to the Triângulo Mineiro region and consists of medium-grained sandstones, conglomerates, pebbly sandstones and siltstones. Its framework consists of quartz, feldspars, rock fragments (basalt, quartzites, schists, sandstones) and sandstone intraclasts. These rocks can be classified as lithic sandstones, sublithic sandstones and feldspathic lithic sandstones. The presence of thick conglomeratic sequences — consisting of sandstone intraclasts — near Serra do Veríssimo, is interpreted as due to tectonic activity in this area during the deposition of the Uberaba Formation. The diagenetic evolution may be divided into eodiagenetic and mesodiagenetic stages. The eodiagenesis is represented by the following aspects: a) presence of large volumes of volcanic dust due to the volcanic activity in the Alto Paranaiba region, which were mechanically infiltrated in the intergranular pores of rocks; b) autigenesis of zeolite and silica; c) autigenesis of iron oxides, dolomites, calcretes, silcretes, attapulgite and sepiolite. The mesodiagenesis is marked by formation of calcite and barite, the former being the most important phase in volume. The textural relationships as well as the reddish colors of cathodoluminescence due to the high Mn content suggest the mesodiagenetic origin of calcite. The sedimentary environments characterized by braided river complex controlled the development of the autigenic minerals, during the eodiagenesis. The high permeability of these rocks is related to the textural heterogeneity, which allowed the influx of meteoric water. The framework constituents of these rocks were the main source of material for the diagenetic phases.

Subaerial

Lithic fragment

10.25249/0375-7536.199929163172

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A bacia de antepaís paleoproterozóica Sabará, Quadrilátero Ferrífero, Minas Gerais.

Brazilian Journal of Geology (2002)

Luciana Andrade Reis Marcelo A. Martins-Neto Newton Souza Gomes Issamu Endo Hanna Jordt-Evangelista

The Sabara Group is a 3 - 3.5 km thick sequence composed of schists, meta-sandstones, meta-siltites, meta-conglomerates, meta-diamictites, meta-rhythmites and phyllites, whose protoliths are greywackes, sandstones, siltites, conglomerates, diamictites, rhythmites and pelites. The rocks of the Sabara Group record a significant change of depositional setting and sediment source comparing with the rest of the Minas Supergroup. The Sabara Group occurs suitable for sedimentological-stratigraphical analysis in the Dom Bosco syncline, Moeda syncline and in the Serra do Curral. The Sabara Group was divided into the following ten facies, which occur in the field arranged in coarsening-upward (CU) successions: massive conglomerate (debris flow), coarse diamictite (debris flow), fine diamictite (debris flow), mixed greywacke (mass flow), arkosic greywacke (mass flow), tabular sandstone (turbidity currents), rhythmite (turbidity currents), siltite (low-density turbidity current), pelite (deposition of suspension) and black shale (deposition of suspension). These facies deposited in a talus fans/submarine fans/basin system tract. The Sabara Group represents foreland basin deposits related to the Transamazonian Orogeny. The clast suite of the diamictites and conglomerates points to erosion and reworking of supracrustal sequences (Minas Supergroup and Rio das Velhas Supergroup) and uplifted basement. The Sabara Group provenance plots show mixed source areas, predominating intermediate igneous and quartzose sedimentary provenance, although felsic and mafic igneous also contributed. These data indicate a compartmentalized, complex source area. The tectonic setting plots indicate a provenance from active continental margin/continental magmatic arc. The Sabara Group represents probably a Transamazonian compartmentalized foreland basin development during deformation uplift and erosion of Archean and Paleoproterozoic deposits of the Mineiro Belt. The Sabara basin, based on the location of its deposits and petrofacies, can be divided into three sub-basins: Antonio Pereira-Ouro Preto-Mariana-Rodrigo Silva, Lagoa das Codornas and Sabara-Belo Horizonte-Ibirite-Fernao Dias sub-basins.

Felsic

Diamictite

10.5327/rbg.v32i1.958

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Citations (11)

Ocorrência de rochas da fácies granulito no Cinturão Mineiro, Minas Gerais, Brasil

Rem Revista Escola de Minas (2010)

Newton Souza Gomes Hanna Jordt Evangelista Edgar Batista de Medeiros Júnior Raphael Carneiro Filippo Luciano Fernandes Germano

Na região de Lagoa Dourada, inserida no Cinturão Mineiro, ocorrem granitóides paleoproterozóicos, que intrudem seqüências supracrustais arqueanas do greenstone belt Rio das Velhas. Os granitóides são cortados por rochas máficas anfibolitizadas, que portam xenólitos de granulitos. Trata-se de granulitos máficos caracterizados pela textura granoblástica e pela paragênese ortopiroxênio-clinopiroxênio-anfibólio-plagioclásio. Como fases secundárias, registram-se actinolita, cummingtonita, carbonato, epídoto, granada e quartzo. Determinações geotermométricas baseadas nos pares minerais ortopiroxênio-clinopiroxênio e anfibólio-plagioclásio produziram valores de temperatura entre 700 e 853ºC. As fases secundárias são produtos de um processo metamórfi co posterior.

10.1590/s0370-44672010000300003

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Contribution to petrology and diagenesis of the hyaloclastites of Macau Formation, Potiguar Basin, RN, Brazil; Contribuicao a petrologia e diagenese dos hialoclastitos da Formacao Macau, Bacia Potiguar, RN, Brasil

Newton Souza Gomes Selma Fernandes

Based on the study of forty subsurface rock samples from bore holes of the Macau Formation, Potiguar Basin in Brazil, it was possible to set up a petrographic characterization of the rocks and to establish a diagenetic pathway for the unit. The lithologic types investigated here have been classified as hyaloclastites, whose origin is related to the interaction of mafic lava flows with sea water. The mixture of terrigenous and bioclastic fragments suggests a shallow water depositional environment. Based on thin section descriptions, X-ray diffractometry, infrared spectrometry, REM determination and fluid inclusions studies, six diagenetic events were recognized, and they probably affected the rocks in the following chronological sequences: pyritization, palagonitization, authigenic clay formation, authigenic zeolite formation, carbonate cementation and carbonate dissolution. The last diagenetic event responsible for the secondary porosity (up to 20%) observed in some samples. This porosity was estimated by point counting in thin sections and belongs mainly to the intergranular and moldic types. (author) 46 refs., 13 figs., 1 tab.

Authigenic

Terrigenous sediment

Lithology

Overprinting

Grainstone

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Caracterização do hidrotermalismo “verde” em rochas siliciclásticas do Grupo Pajeú (Supergrupo Oliveira dos Brejinhos), Espinhaço Setentrional, Bahia.

Brazilian Journal of Geology (2010)

André Danderfer Newton Souza Gomes Kelly Cristina de Lima Ramos Pinto Alves

The Pajeu Group defines the upper interval of the Oliveira dos Brejinhos Supergroup, occurring along the eastern border of the Northern Espinhaco Range in Bahia State. This unit records the infilling of a typical rift basin, formed during one of the evolutionary events of the Espinhaco basin in the northern part of the Sao Francisco craton. The basal succession (Riacho Fundo Formation) was deposited mainly through alluvial fans systems, braided river and “dry” eolic system. Subsequently this sequence was covered by a retrogradational delta-lacustrine system (Ipucaba Formation). In the southern, the basin infilling is finalized by an intermediate volcanism and associated clastic and volcanoclastic rocks (Bomba Formation) of Eocalymian age. A hydrothermal stage occurred in the final stages of rift formation. This hydrothermalism percolated the rocks of the described units, depositing an odd mineralogical paragenesis that gives a green color to most of rocks of the Pajeu Group; rocks above this unit don’t show effects of this hydrothermal phase. Based on microscopic studies and microprobe determinations the hydrothermal paragenesis composed by garnet, amphiboles, epidote, titanite, quartz and albite could be recognized. Based on field relationships and mineral paragenesis this hydrotermalism could be interpreted as related to the Pajeu rifting and originated by an intraplate extensional magmatism.

Paragenesis

Siliciclastic

10.5327/rbg.v40i3.1541

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The post-depositional evolution of mesoproterozoic to early neoproterozoic tight sandstone reservoirs, São Francisco basin, Brazil

Journal of South American Earth Sciences (2024)

Jéssica Melanya Sisti de Paiva Angélica Fortes Drummond Chicarino Varajão Humberto Reis Newton Souza Gomes João F. Suss

10.1016/j.jsames.2024.105278

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OCORRÊNCIA DE FERROPIROSMALITA NAS BRECHAS MINERALIZADAS DO DEPÓSITO DE Au-Cu-(±ETR-U) DE IGARAPÉ BAHIA, PROVÍNCIA MINERAL DE CARAJÁS

Brazilian Journal of Geology (1999)

Edison Tazava Claudinei Gouveia de Oliveira Newton Souza Gomes

Nos ultimos anos, diversos trabalhos tem reportado a presenca de minerais da serie da pirosmalita [(Fe,Mn)8Si6O15(OH,CI)10] em depositos de sulfetos macicos vulcano-exalativos e depositos de Fe-Mn metamorfizados. Neste trabalho, apresentamos uma descricao inedita da ferropirosmalita no deposito de Au-Cu-(±ETR-U) de Igarape Bahia, localizado no distrito auro-cuprifero da Provincia Mineral de Carajas. Admite-se que esse deposito foi gerado por processos similares aqueles envolvidos na genese dos depositos da classe oxidos de ferro-(Au-Cu-U-ETR) do tipo Olympic Dam. A ferropirosmalita descrita ocorre sob dois contextos: i) associada a veios e venulas carbonaticas; e ii) associada a brechas heteroliticas compostas por fragmentos de formacao ferrifera bandada, metavulcânicas basicas e matriz rica em magnetita, calcopirita, bornita, pirita, siderita, minerais ricos em urânio e elementos terras raras, anfibolio, stilpnomelana, clorita e quartzo. O crescimento da ferropirosmalita teria envolvido a substituicao de minerais ricos em ferro (clorita, magnetita e siderita), controlado pela introducao de fluidos magmaticos ricos em cloro. A percolacao dos fluidos foi induzida pela permeabilidade elevada das brechas e tambem pela descontinuidade ao longo das paredes de venulas carbonaticas. O modo de ocorrencia da ferropirosmalita e o seu crescimento em equilibrio com anfibolio (ferro-hornblenda actinolitica) sao sugestivos de crescimento metassomatico para o mineral, supostamente sob condicoes termicas na transicao das facies xisto verde/anfibolito. A ferropirosmalita descrita no deposito de Au-Cu-(±ETR-U) de Igarape Bahia representa assim um exemplo pouco comum da formacao desse mineral sob condicao hidrotermal/magmatica.

10.5327/rbg.v29i3.704

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PETROGRAFIA E EVOLUÇÃO DIAGENÉTICA DOS ARENITOS DA PORÇÃO NORTE E NORDESTE DA BACIA BAURU (CRETÁCEO SUPERIOR)

Brazilian Journal of Geology (2005)

Alessandro Batezelli Newton Souza Gomes José Alexandre de Jesus Perinotto

The Bauru Basin is an intracratonic basin in the southeast of Brazil, formed during the Late Cretaceous by reactivation Precambrian faults zone (Tres Lagoas, Presidente Prudente and Riberiao Preto). The main lithology are mudstones, sandstones and conglomerates, deposited in an alluvia/lacustrine system. Petrographic analyses developed in its north/northeast portion, specially in the Uberaba and Marilia formations, allowed to characterize mineralogically and texturally the sandstones of Bauru Group, to establish the diagenetic sequence and the provenance of the grains. The results of analyses have permitted to qualify the sandstones as lithosandstones/feldspars lithosandstones, soft grains non-compact, mineralogically composed by quartz, feldspars, lithics fragments (basalts, alkaline rocks, sedimentary rocks deriving from paleozoic units of the Parana Basin, and metamorphic from precambrian basement), and heavy minerals (pyroxene, amphibole, biotite, apatite, titanite, Ti oxides, tourmaline, epidote, garnets almandite and melanite). The eodiagenesis is determined by mechanically infiltrated clay as a result of sieve effect, palagonitization processes in the basalt fragments, cementation by calcite, dolomite, hematite, and calcrete genesis. In the mesodiagenesis the mainly processes resulted in the paligorskite, silex, quartz, feldspar, and zeolite autigenesis, besides cementation by espathic calcite and silicate substitution. The absence of volcanic mineral, ashes, or anyone volcanic activity evidence during the sedimentation period, allowed to conclude that the .volcanic contribution. mentioned by many authors in the last years, is restricted to the basalt and others volcanic fragments eroded from Serra Geral Formation and Alkaline Intrusions of the Alto Paranaiba Uplift and Alkaline Complex of South Goias. This permitted qualify the sandstones as epiclastic deposits.

Chalcedony

10.5327/rbg.v35i3.1171

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The occurrence of microdiamonds in Mesoproterozoic Chapada Diamantina intrusive rocks: Bahia / Brazil

Anais da Academia Brasileira de Ciências (2007)

Gislaine Amorés Battilani Newton Souza Gomes Wilson J. Guerra

The origin of diamonds from Serra do Espinhaço in Diamantina region (State of Minas Gerais) and in Chapada Diamantina, Lençóis region (State of Bahia) remains uncertain, even taking into account the ample research carried out during the last decades. The lack of typical satellite minerals in both districts makes a kimberlitic source for these diamonds uncertain. In mid 18th century the occurrence of a metamorphosed igneous rock composed of martite, sericite and tourmaline was described in Diamantina region and named hematitic phyllite, considered by some researchers as a possible diamond source. Similar rocks were found in Lençóis and examined petrographically and their heavy mineral concentration was investigated by means of scanning electron microscopy (SEM). Petrographic analyses indicated an igneous origin for these rocks and SEM analyses showed the discovery of microdiamonds. Geochronological studies using the Ar/Ar technique in muscovites yielded minimum ages of 1515 ± 3 Ma, which may correlate with 1710 ± 12 Ma from U-Pb method in igneous zircons from the hematitic phyllites. Both rock types also have the same mineral and chemical composition which leads to the conclusion that the intrusive rocks were protolith of the hematitic phyllites. This first discovery of microdiamonds in intrusive rocks opens the possibility of new investigation models for diamond mineralization in Brazilian Proterozoic terrains.

Sericite

10.1590/s0001-37652007000200013

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Citations (19)

PETROGRAFIA E EVOLUÇÃO DIAGENÉTICA DOS ARENITOS DA PORÇÃO NORTE E NORDESTE DA BACIA BAURU (CRETÁCEO SUPERIOR)

Revista Brasileira de Geociências (2005)

Alessandro Batezelli Newton Souza Gomes José Alexandre de Jesus Perinotto

10.25249/0375-7536.2005353311322

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Citations (18)