Norberto Dani

Universidade Federal do Rio Grande do Sul

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Marcus Vinícius Dorneles Remus

Universidade Federal do Rio Grande do Sul

Guilherme Sonntag Hoerlle

Universidade Federal do Rio Grande do Sul

Rafael da Rocha Ribeiro

Universidade Federal do Rio Grande do Sul

Jefferson Cárdia Simões

Universidade Federal do Rio Grande do Sul

Edson Ramírez

Higher University of San Andrés

Cristiano Lana

Universidade Federal de Ouro Preto

Rafael S. dos Reis

Universidade Federal do Rio Grande do Sul

Luiz Fernando De Ros

Universidade Federal do Rio Grande do Sul

Kelvyn Mikael Vaccari Ruppel

Universidade Federal do Rio Grande do Sul

André Sampaio Mexias

Universidade Federal do Rio Grande do Sul

Cooperative Institutions

Universidade Federal do Rio Grande do Sul

Instituto de Geociencias

Universidade Federal do Rio Grande

Centre National de la Recherche Scientifique

University of Rio Grande and Rio Grande Community College

Petrobras (Brazil)

National Council for Scientific and Technological Development

Universidade de São Paulo

Université de Poitiers

Brazilian Institute of Geography and Statistics

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Proveniência sedimentar: métodos e técnicas analíticas aplicadas

Revista Brasileira de Geociências (2008)

Marcus Vinícius Dorneles Remus Rogério Schiffer Souza José Cupertino Luiz Fernando De Ros Norberto Dani

The analysis of sedimentary provenance is a tool increasingly used in basin analysis and particularly in the exploration for clastic hydrocarbon reservoirs. The original sand composition directly controls the types and intensity of the diagenetic processes promoting porosity reduction and generation in the sandstones. Therefore, provenance studies identifing the distribution of the original sands composition in time and space are fundamental for the prediction of potential sandstone reservoirs. Provenance analysis provides the mineralogic and lithologic composition of the source areas, infering their geographic location, climate and topography, determining the main routes of sand distribution, and the distance and time of transportation. The diversity of detrital heavy minerals occurring in sandstones and the occurrence in paragenesis diagnostic of specific source rocks make the analysis of heavy minerals the most sensitive and robust technique for provenance studies. The combination of detrital heavy minerals with quantitative whole-rock petrography, feldspars composition, quartz and rock fragments types allows to establish the complex history of the sediments from their source areas to the depositional sites. Furthermore, modern microanalytical techniques allow the precise determination of the chemical composition of individual grains through electron microprobe (e.g. garnets and tourmalines), the ages of zircon, monazite and titanite through SHRIMP (Sensitive High Resolution Ion Microprobe) or ICPMS - LA (Inductively-Coupled Plasma Mass Spectrometry by Laser Ablation). These parameters directly connect the grains of the sandstones with the composition and age of the igneous or metamorphic rocks of the source terrains. Additionally, apatite and zircon fission track studies may determine the main ages of uplift and erosion of the source terrains. Integrated provenance studies of sandstones from specific areas of several Brazilian margin basins (Santos, Campos, Espírito Santo, Jequitinhonha and Pelotas) allowed the identification of the main source-areas and routes of sediment dispersal. These works shall substantially contribute, together with diagenetic studies, for the reduction of risks envolved in the exploration for clastic reservoirs in the Brazilian margin basins.

Lithic fragment

Detritus

Heavy mineral

10.25249/0375-7536.2008382s166185

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Citations (9)

A importância do estudo biogeoquímico na mobilidade dos elementos residuais em ambiente supergênico

Brazilian Journal of Geology (1990)

Maria do Carmo Lima e Cunha Norberto Dani Milton Luiz Laquintinie Formoso

Consideracoes sobre a mobilidade dos elementos residuais em ambiente supergdnico sao feitas sob a optica biogeoqufmica, visando uma melhor compreensao da distribuicao dos elementos menores e tracos na biosfera. Os resultados obtidos demonstram que mesmo aqueles elementos menos moveis como Al, o Ti e o Zr sao absorvidos pela especie Baccharis uncinetta em quantidades consideraveis. Alem disso, a referida especie revelou uma capacidade de concentrar Al que lhe confere um carater de acumuladora e tolerante aos teores excessivos deste elemento.

10.5327/rbg.v20i1.325

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Citations (3)

Dickite in shallow oil reservoirs from Recôncavo Basin, Brazil: diagenetic implications for basin evolution

Clay Minerals (2008)

Ján Bóna Norberto Dani Marcelo Ketzer Luiz Fernando De Ros

Abstract Fluvial and aeolian sandstones of the Sergi Formation are the most important reservoirs of the Recôncavo Basin, Brazil. Optical and scanning electron microscopy, X-ray diffraction and infrared spectroscopy revealed the occurrence of dickite, a clay mineral indicative of deep burial conditions ( T >100ºC), in the shallow Buracica (630–870 m) and Água Grande (1300–1530 m) oilfields. Vermicular dickite replaces K-feldspar and plagioclase grains, and fills intra- and inter-granular pores. Its vermicular habit is a product of pseudomorphic kaolinite transformation during burial. The presence of dickite is in accordance with the intensity of compaction, post-compactional quartz cementation and δ 18 O values of calcite cements ( T up to 109ºC). These petrological features of deep burial, as well as apatite fission-track analyses, indicate that uplift and erosion of at least 1 km, and probably >1500 m, affected the central part of the Recôncavo Basin and possibly the entire region. This uplift has not been detected previously by conventional structural and stratigraphic models.

Cementation (geology)

10.1180/claymin.2008.043.2.06

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Citations (19)

Geochemistry, metamorphic evolution and tectonic significance of metabasites from Caçapava do Sul, southern Brazil

Brazilian Journal of Geology (2019)

Victor Bicalho Marcus Vinícius Dorneles Remus Rafael Rizzardo Norberto Dani

This paper proposes the generation and closure of a proto-ocean and formation of an island arc in the Neoproterozoic Passo Feio Metamorphic Complex (PFMC), Caçapava do Sul region, southern Brazil. The PFMC, São Gabriel Terrane, consists of a Neoproterozoic supracrustal metavolcano-sedimentary sequence intruded by the Caçapava Granite. The study uses petrography, whole-rock geochemistry and mineral chemistry to identify the geochemical affinity and tectonic environment of the amphibolites contained in PFMC, the basalts and pillow lavas of Arroio Mudador Formation and dikes intruded in nearby volcanogenic rocks of Hilário Formation. The applied methods allow the metamorphic facies classification of prehnite-pumpellyite for the basalts and pillow lavas, greenschist for the dikes and lower amphibolite for the amphibolites. The discriminant diagrams indicate from tholeiitic to alkaline affinities for the Hilário Formation dikes. The basalts, pillow lavas and amphibolites have basaltic to basaltic-andesite composition and predominant tholeiitic affinity, interpreted as derived of the same protolith. The geotectonic diagrams mostly indicate volcanic arc basalts. The proposed evolution model starts with a proto-ocean opening through the Bossoroca Arc rifting around 760Ma, where an island arc is formed (PFMC rocks), precipitation of carbonates and marls, subsequent closure, two metamorphism events and the Caçapava Granite intrusion around 562 Ma.

Pillow lava

Dike

Island arc

Protolith

Greenschist

Andesites

10.1590/2317-4889201920180039

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Citations (5)

Weathering of Viamão granodiorite, south Brazil: Part 2 – Initial porosity of un-weathered rock controls porosity development in the critical zone

Geoderma (2022)

Marine Bonnet Laurent Caner Marja Siitari‐Kauppi Arnaud Mazurier André Sampaio Mexias

The development of porosity during rock weathering is a key process controlling nutrients release, water holding capacity available for plants and water flow. Here we used X-ray Computed Tomography (XRCT) and 14C PolyMethylMethAcrylate (PMMA) autoradiography to show how cracks are created and enlarged during initial weathering stages (saprock and saprolite) of granodiorite in southern Brazil (Viamão - RS). The physical evolution is characterized by imaging the pore network, using 14C-PMMA and XRCT methods. Combined with bulk porosity measurements, they highlight the increase in porosity with the degree of weathering (un-weathered rock Φ = 1.66 %, saprolite Φ = 11.7 %). This increase is related to the joint increase of the density of the cracks (un-weathered rock D = 0.28 mm−1, saprolite D = 0.94 mm−1) and of the average opening of the microcracks (un-weathered rock w = 2.4 µm, saprolite w = 3.9 µm) and macrocracks (un-weathered rock w = 176 µm, saprolite w = 400 µm). However, these average crack openings do not account for the variability of the openings that govern the flows, characterized here by specific distribution ranging from the submicrometre to the centimetre scale. The results highlight that the pore network of the un-weathered rock plays a key role in the initial stages or incipient weathering. The density and aperture and cracks increase following the subcritical cracking concept and new pores are formed by chemo-mechanical processes. The presence/absence of initial fractures in the regolith is certainly a key parameter controlling the weathering of different rock types (mafic vs felsic).

Saprolite

10.1016/j.geoderma.2022.116247

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Citations (3)

Supplementary material to "Relationships between Andean Glacier Ice-Core Dust Records and Amazon Basin Riverine Sediments"

Rafael S. dos Reis Rafael da Rocha Ribeiro Barbara Delmonte Edson Ramírez Norberto Dani

Ice core

Amazon basin

10.5194/tc-2021-186-supplement

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Citations (0)

Weathering of Viamão granodiorite, South Brazil: Part 1 – Clay minerals formation and increase in total porosity

Geoderma (2022)

Marine Bonnet Laurent Caner Marja Siitari‐Kauppi Arnaud Mazurier André Sampaio Mexias

Saprolite

Vermiculite

Soil production function

Parent material

10.1016/j.geoderma.2022.115968

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Citations (2)

Apatite multi-generations in the Três Estradas Carbonatite, Southern Brazil: physical and chemistry meaning and implications to phosphate ore quality

Brazilian Journal of Geology (2019)

Henrique de Maman Anzolin Norberto Dani Marcus Vinícius Dorneles Remus Rafael da Rocha Ribeiro Alfredo Rossetto Nunes

Carbonatites were recently discovered in Southern Brazil, which increased the interest to evaluate the economic potential of these uncommon rocks, especially the Três Estradas Carbonatite. Carbonates are the dominant minerals of fresh rock followed by apatite, but the weathering process makes apatite abundant. We focused on apatite from the carbonatite using conventional petrography and electronic microscopy associated with microprobe, micro-Raman and Fourier-transform infrared spectroscopy. Results demonstrate the existence of four types. The primary type is associated with the rock crystallization and the subsequent three others are associated with weathering processes. The alteration mechanism was favorable for initial carbonate leaching and subsequent increase of phosphate with late precipitation of three new apatite generations. The deduced model involves long exposure during polycyclic climate changes, intercalating periods of warm dry with humid climate. The apatite types differ chemically and morphologically and have distinctive characteristics that are suitable to be used to differentiate them. These properties should be considered in future planes of industrial processes to transform apatite into single superphosphate, a basic input for fertilizer production.

Carbonatite

Phosphorite

10.1590/2317-4889201920180092

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Citations (5)

Structural changes of potassium-saturated smectite at high pressures and high temperatures: Application for subduction zones

Applied Clay Science (2014)

Larissa Colombo Carniel Rômmulo Vieira Conceição Norberto Dani Vicente Fiorini Stefani Naira Maria Balzaretti

Illite

Pyrophyllite

10.1016/j.clay.2014.09.037

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Citations (14)

Detrital Zircon and Tourmaline Unravel Provenance and Polycyclic Origin of Cretaceous Tupanciretã Subbasin, South Brazil

Kelvyn Mikael Vaccari Ruppel Norberto Dani Marcus Vinícius Dorneles Remus Guilherme Sonntag Hoerlle Cristiano Lana

The recognition and evaluation of polycyclic processes in sedimentary units are critical for proper provenance analysis and sedimentary system interpretation. The chemical composition and textural maturity of detrital tourmalines and zircons allow for source area restriction and transport and deposition process identification. This study investigates the origin and history of post-Gondwanan sediments of the Tupanciretã Formation in southern Brazil, which lacks provenance studies. The Tupanciretã Formation is in a similar setting of the Bauru Supersequence at the uppermost portion of the Paraná Basin. Detrital zircon ages indicate sediment provenance from the Transamazonian, Grenvillian, and Brasiliano orogenic cycles of the Rio Grande do Sul Shield and younger grains (280-128 Ma) record contribution from the Choiyoi and Serra Geral igneous events, with a maximum deposition age of 127 Ma. Detrital tourmaline chemical analyses points to the Sul-riograndense Shield as the ultimate source, with metapelitic, metapsamitic and granitic origins. The predominant degrees of roundness are well rounded to rounded suggest evidence of sediment recycling from sedimentary units of the Paraná Basin, with important aeolian reworking involved. Zircon U-Pb signatures are compatible with the eastern sector of the Botucatu Formation in Rio Grande do Sul as the immediate source and the northeastern Sul-riograndense Shield as the ultimate source. Intermediate sources between the Sul-riograndense Shield and the Tupanciretã Formation were Gondwanan sedimentary units of the Paraná Basin, with possible participation from the Camaquã Basin.

Tourmaline

10.2139/ssrn.4530691

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Citations (0)