Marcus Vinícius Dorneles Remus

Universidade Federal do Rio Grande do Sul

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Léo Afrâneo Hartmann

Universidade Federal do Rio Grande do Sul

Norberto Dani

Universidade Federal do Rio Grande do Sul

Cristiano Lana

Universidade Federal de Ouro Preto

Guilherme Sonntag Hoerlle

Universidade Federal do Rio Grande do Sul

Kerstin Saalmann

Norwegian Geological Survey

Kelvyn Mikael Vaccari Ruppel

Universidade Federal do Rio Grande do Sul

Luiz Fernando De Ros

Universidade Federal do Rio Grande do Sul

Maria Lídia Vignol-Lelarge

Universidade Federal do Rio Grande do Sul

Neal J. McNaughton

Curtin University

T. Cerva-Alves

Universidade Federal do Rio Grande do Sul

Cooperative Institutions

Universidade Federal do Rio Grande do Sul

Instituto de Geociencias

Universidade Federal do Rio Grande

National Council for Scientific and Technological Development

Universidade de São Paulo

University of Rio Grande and Rio Grande Community College

University of Western Australia

Universidade Federal de Ouro Preto

Petrobras (Brazil)

Serviço Geológico do Brasil - CPRM

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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)

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)

Insights into sedimentary provenance and the evolution of the Potiguar Basin, NE Brazil, using U–Pb ages and Lu–Hf isotopes in detrital zircons

Marine and Petroleum Geology (2021)

Anderson Baesso Marcus Vinícius Dorneles Remus B.R.B. Pereira Ana Ramalho Alkmim Cristiano Lana

Basement

Orogeny

Geochronology

Baltic Shield

Overprinting

10.1016/j.marpetgeo.2021.105170

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Citations (5)

Metalogênese do Depósito de Cobre Cerro dos Martins, RS -Revisão e Geoquímica Isotópica de SR, S, O e C-

Pesquisas em Geociências (2004)

João Angelo Toniolo Marcus Vinícius Dorneles Remus Moacir José Buenano Macambira Cândido Augusto Veloso Moura

This paper presents the geology, chemical data, Pb-Pb zircon ages, sulfur, carbon, oxygen, strontium isotopes and fluid inclusions of Cerro dos Martins copper deposit. The deposit is hosted by the Neoproterozoic volcano-sedimentary sequence of the Camaquã Basin in the Rio Grande do Sul Shield, southern Brazil. The ores consist of a set of Cu-sulfide NW-trending veins and disseminations within of the Bom Jardim Group. Chalcocite and bornite are the main ore minerals, whereas carbonates, barite, quartz and hematite are the gangue. The volcanic host rocks show an alkaline affinity. An intrusive quartz-diorite body, also shown alkaline affinity, yield a 550±5 Ma zircon age (initial 87Sr/86Sr of 0,704), which is considered the minimum age of the copper mineralization. The δ34SCDT of sulfides ranges from –6.2 to +0.9‰. Hematite in the mineral paragenesis suggests oxidizing conditions, which would shift the original magmatic sulfur isotopic compositions (δ34S ~ 0‰) to negative values. Barite with δ34SCDT from +9.25 to +10.65‰ may also indicate oxidation due to mixing of a hot rising fluid with cold meteoric water. The δ13CPDB of calcite from gangue, in the range of – 1,90 to – 4,45% is interpreted as originated from mixing sources – magmatic and fluids contaminated by basement marbles. Studies on primary aqueous biphasic fluid inclusions show homogenisation temperatures with average of 215°C. Water in equilibrium with calcite from hydrothermal fluid show calculated values of δ O18 SMOW between 3 and 14‰, suggesting derivation from a magmatic source with some contributions from meteoric water. 87Sr/86Sr from these calcite show values between 0, 7068 – 0, 7087, typical from upper crust. Hence, the Cerro dos Martins copper deposit is interpreted to have had origin by a mixing between a magmatic-hydrotermal fluids related to the alkaline-shoshonitic, post-collisional magmatic event (595-550 Ma) of the Dom Feliciano Orogeny and basement rocks. Exploration models for copper deposits in this shield should consider the alkaline magmatism in the genesis of deposits.

Paragenesis

δ34S

Breccia

10.22456/1807-9806.19573

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Citations (5)

Distal Magmatic-Hydrothermal Origin for the Camaquã Cu (Au-Ag) and Santa Maria Pb, Zn (Cu-Ag) Deposits, Southern Brazil

Gondwana Research (2000)

Marcus Vinícius Dorneles Remus Léo Afrâneo Hartmann Neal J. McNaughton David I. Groves J.L. Reischl

Base metal

Back-arc basin

10.1016/s1342-937x(05)70094-0

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Citations (55)

Gold in the Neoproterozoic juvenile Bossoroca Volcanic Arc of southernmost Brazil: isotopic constraints on timing and sources

Journal of South American Earth Sciences (1999)

Marcus Vinícius Dorneles Remus Neal J. McNaughton Léo Afrâneo Hartmann Jair Carlos Koppe Ian R. Fletcher

Greenschist

Volcanic arc

10.1016/s0895-9811(99)00026-7

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Citations (75)

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)

Tectonic Evolution of Two Contrasting Schist Belts in Southernmost Brazil: A Plate Tectonic Model for the Brasiliano Orogeny

International Geology Review (2005)

Kerstin Saalmann Léo Afrâneo Hartmann Marcus Vinícius Dorneles Remus

Abstract Two Brasiliano schist belts (Porongos belt and São Gabriel block) of contrasting geotectonic setting exhibiting a distinct structural evolution are exposed in the southern Brazilian shield east of the Rio de la Plata craton. Trace-element and isotope data (Sm-Nd, Rb-Sr) demonstrate that the São Gabriel block and Porongos belt represent two distinct tectonostratigraphic blocks, with the former consisting of Neoproterozoic juvenile rocks, and the latter being characterized by intense reworking of old continental crust. The São Gabriel block in the west consists of Neoproterozoic relics of two Brasiliano magmatic arcs, an intra-oceanic arc, and a younger continental arc or active continental margin. The Porongos belt located on the Encantadas block, in contrast, formed in a passive-margin setting on thinned continental crust in an extensional or transtensional regime. Basin formation was accompanied by volcanism due to partial melting of the stretched continental crust. Comparison of the structural evolution and age data provide constraints on the timing of tectonic juxtaposition of the two terranes. Plate tectonic evolution started with opening of an oceanic basin to the east of the Rio de la Plata craton since at least 0.9 Ga, possibly earlier. First subduction occurred at about 0.87 Ga, leading to accretion of an intra-oceanic island arc to the passive margin of the Rio de la Plata craton. An active continental margin developed above a west-directed subduction zone beneath the block consisting of the Rio de la Plata craton and the attached island arc. At the same time, the Porongos basin formed on stretched continental crust of the Encantadas passive margin. The final stage of the São Gabriel event represents the collision of the Rio de la Plata craton with the Encantadas block between about 700 to 660 Ma. Progressive shortening resulted in SE-directed brittle thrust faulting in the São Gabriel block, and left-lateral ductile shear at the Dorsal de Canguçu Shear Zone (DCSZ) led to DB4 NW-vergent folding and thrusting in the Porongos belt. Activity at the DCSZ ceased at about 620 Ma, whereas deformation became localized in transcurrent shear zones accompanied by synkinematic granite intrusions in the Dom Feliciano belt farther to the east. Post-tectonic granites of 600-580 Ma are widespread in both western and eastern areas. However, shearing continued in localized fault zones lasting at least until 540 Ma as recorded by fault-related granites.

Continental Margin

Back-arc basin

Island arc

Orogeny

Passive margin

Continental arc

10.2747/0020-6814.47.12.1234

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Citations (24)

Neoproterozoic magmatic arc assembly in the southern Brazilian Shield - constraints for a plate tectonic model for the Brasiliano orogeny

Geotectonic Research (2007)

Kerstin Saalmann Marcus Vinícius Dorneles Remus Léo Afrâneo Hartmann

Orogeny

Back-arc basin

10.1127/1864-5658/07/0095-0041

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Citations (5)

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)