Stromatolites in the mesoproterozoic Itaiacoca Group (se Brazil): paleoenvironmental inferences and comparisons with other similar forms

Filho, William Sallun; Fairchild, Thomas R.

doi:10.1590/s0001-37652000000400021

Cited by 3 publications

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“…In the Brazilian Precambrian record, microbial structures have been described in many sedimentary basins, including different types of stromatolites and associated structures (Dardenne and Campos Neto 1975;Souza and Müller 1984;Zaine 1991;Sallun Filho and Fairchild 2000;Nogueira et al 2003;Zucatti Da Rosa 2005;Warren et al 2014;Fairchild and Sanchez 2015;Romero et al 2016). The most studied Neoproterozoic unit from South America is undoubtedly the Bambuí Group in eastern Brazil.…”

Section: Introductionmentioning

confidence: 99%

Simple Structures and Complex Stories: Potential Microbially Induced Sedimentary Structures in the Ediacaran Serra De Santa Helena Formation, Bambuí Group, Eastern Brazil

Okubo

Inglez

Uhlein

et al. 2023

Palaios

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Microbially induced sedimentary structures (MISS) are abundant in Ediacaran and lower Cambrian successions. However, the relationship between MISS distribution and facies has not been thoroughly explored in Ediacaran–Cambrian successions in South America. This study documents the occurrence of MISS and other potential biogenic structures from the late Ediacaran Serra de Santa Helena Formation in the Bambuí Group of eastern Brazil. This unit overlies the Cloudina-bearing Sete Lagoas Formation and is a mixed carbonate-siliciclastic succession devoid of macroscopic body fossils. Potential microbial structures include wrinkled structures such as “elephant-skin” and Kinneyia-like textures, as well as pustular structures and abundant positive epirelief discoidal structures. Another putative biogenic structure is a mm-wide meandering groove resembling a simple locomotion trail of a small vagile benthic metazoan. Microbial surface textures (i.e., “elephant skin” and Kinneyia-type wrinkles) were mainly observed in heterolithic deposits, usually at the interface between sandstone and siltstone/shale. On the other hand, discs show a facies-independent distribution, observed in heterolithic as well as carbonate and marl deposits. Petrographic analyses of these discs suggest that they have complex origins and some of them may be diagenetic structures. Thus, while facies may have strongly controlled the preservation of MISS-related structures and textures in the Serra de Santa Helena Formation, their abundance and diversity in tidal flat deposits indicate the wide distribution of matgrounds in these shallow marine paleoenvironments. Also, we demonstrate how detailed description and classification of simple features, such as discoidal structures, is an important task for paleoenvironmental reconstruction of marine ecosystems at the Ediacaran–Cambrian transition when the microbially bounded substrates played important roles in the dynamics of coastal environments.

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Section: Introductionmentioning

confidence: 99%

Simple Structures and Complex Stories: Potential Microbially Induced Sedimentary Structures in the Ediacaran Serra De Santa Helena Formation, Bambuí Group, Eastern Brazil

Okubo

Inglez

Uhlein

et al. 2023

Palaios

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“…The deposition of the Itaiacoca Group has been interpreted as related with different tectonic settings, including deposits of tidal plain environment close to the coast (Petri and Suguio, 1969), grabens and rifts with formation of elongated and restricted basins (Hasui et al, 1984b(Hasui et al, , 1986, aulacogen basins (Chiodi Filho, 1983, 1984, continental shelf developed in a rifted continental margin basin (Takahashi et al, 1984Souza, 1990Souza, , 1992Campanha, 1991;Frascá, 1992;Sallun Filho, 1999), sedimentation in a relatively deep depositional setting, sub-coast and below fair-weather wave base (Sallun Filho and Fairchild, 2000, 2005, intra arc basin (Soares, 1987a, Andean type (Campanha et al, 1987) and B type subduction settings , delta systems (Trein et al, 1985), arc island (Campanha, 2002) and passive margin developed on a stable region (Reis Neto, 1994;Campanha and Sadowski, 1999).…”

Section: The Itaiacoca Groupmentioning

confidence: 99%

“…In the southwestern portion of the Neoproterozoic Ribeira Belt (Apiaí terrane), between Itapeva and Ribeirão Branco region (SP) (Figure 4.1), are present three main Proterozoic litostratigraphic units: the Itaiacoca Group, the Bairro dos Prestes Formation and the Apiaí-Mirim Complex (Figure 4.2), differentiated in ages and lithological associations (Forero-Ortega et al, 2018). The Itaiacoca Group (Almeida, 1944;Souza, 1990Souza, , 1992 is composed mainly by metapelites and phyllites (Água Nova Formation) with thin intercalations of metatuffs (Forero-Ortega et al, 2018) in transitional contact with calcitic and dolomitic metalimestones (Bairro dos Campos Formation) with Conophyton type stromatoliths (Almeida, 1944;Fairchild, 1977;Sallun Filho, 1999;Sallun Filho and Fairchild, 2000, 2005,…”

Section: Geological Contextmentioning

confidence: 99%

Tectonic compartimentation of an area in the Ribeira belt, between Itapeva and Ribeirão Branco (SP): Itaiacoca Group and Bairro dos Prestes Formation

Forero-Ortega¹

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E foste um difícil começo Afasta o que não conheço E quem vem de outro sonho feliz de cidade Aprende depressa a chamar-te de realidade Porque és o avesso do avesso do avesso do avesso Sampa-Caetano Veloso Vengo de una tierra Que le sobra corazón y voluntad Sueño con el día En que le sobre la razón para cantar Confesión-Marta Gómez Manos que tiemblan, manos que sudan Manos de tierra, maíz y sal Manos que tocan dejando el alma Manos de sangre, de viento y mar Manos de mujeres-Marta Gómez And though the seas are raging You will speak and tame them In You I find my rest You are in control In control-Hillsong To Anjobeli AGRADECIMENTOS É incalculável e inestimável o crescimento acadêmico e pessoal que obtive em minha estadia no Brasil, este foi possível graças a muitas pessoas e instituições. Agradeço ao Professor Doutor Ginaldo Campanha pela confiança, contínua orientação, inumeráveis discussões acadêmicas, liberdade científica no desenvolvimento do projeto e inesgotáveis correções que incluem um pouco de ortografía portuguesa. O senhor é um grande exemplo de pesquisador e ser humano! Ao Professor Doutor Fredeiro Meira Faleiros, pelo apoio fornecido no desenvolvimento do projeto, por ter me ensinado a técnica de orientação cristalográfica de eixos-c do quartzo, e pelas sugestões e orientações nas análises microestruturaies e geoquímicas. Aos professores Renato Paes, Renato de Moraes, Gergely Szabó, Rogério Guitarrari e Patricio Montecinos, pela orientação nas dúvidas que surgiram no desenvolvimento das técnicas usadas no projeto. E ao geólogo André Pires pela ajuda em campo. Ao pessoal técnico e administrativo do Instituto de Geociências da USP, especialmente a Vasco Loios, Katherine Kutsumbos e Alexandre Blumer, pelo apoio dado. À CAPES pela bolsa de mestrado, com a qual mantive os passos deste caminhar, assim como à FAPESP (2015/04487-7) pelo apoio nas jornadas de campo e análises realizadas.

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Pure shear-dominated transpression and vertical extrusion in a strike-slip fault splay from the Itapirapuã Shear Zone, Ribeira Belt, Brazil

et al. 2020

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Stromatolites in the mesoproterozoic Itaiacoca Group (se Brazil): paleoenvironmental inferences and comparisons with other similar forms

Cited by 3 publications

References 0 publications

Simple Structures and Complex Stories: Potential Microbially Induced Sedimentary Structures in the Ediacaran Serra De Santa Helena Formation, Bambuí Group, Eastern Brazil

Simple Structures and Complex Stories: Potential Microbially Induced Sedimentary Structures in the Ediacaran Serra De Santa Helena Formation, Bambuí Group, Eastern Brazil

Tectonic compartimentation of an area in the Ribeira belt, between Itapeva and Ribeirão Branco (SP): Itaiacoca Group and Bairro dos Prestes Formation

Pure shear-dominated transpression and vertical extrusion in a strike-slip fault splay from the Itapirapuã Shear Zone, Ribeira Belt, Brazil

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