Paleoenvironmental redox evolution of Ediacaran-Cambrian restricted seas in the core of West Gondwana: Insights from trace-metal geochemistry and stratigraphy of the Bambuí Group, east Brazil

Guacaneme, Cristian; Caetano-Filho, Sérgio; Paula‐Santos, Gustavo M.; Babinski, Marly; Fraga-Ferreira, Paula Luiza; Bedoya-Rueda, Carolina; Kuchenbecker, Matheus; Reis, Humberto Luís Siqueira; Trindade, Ricardo Iván Ferreira da

doi:10.1016/j.jsames.2022.103998

Cited by 3 publications

(1 citation statement)

References 67 publications

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“…The interactions between various microbial communities and different types of substrates led to the formation of a variety of microbially induced sedimentary surface textures described in this paper. The abundant MISS in the Serra de Santa Helena Formation are consistent with the interpretation of progressive restriction of the Bambuí basin (Paula-Santos et al 2017; Caxito et al 2021; Guacaneme et al 2022), where typical late Ediacaran and early Cambrian macrofaunas were not present, but benthic microbial assemblages thrived.…”

Section: Implications For the Paleobiological Record Of The Bambuí Basinsupporting

confidence: 85%

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: Implications For the Paleobiological Record Of The Bambuí Basinsupporting

confidence: 85%

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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Trace elements in sedimentary pyrite track redox and nutrient fluctuations in the Ediacaran/Cambrian Bambuí Group, Brazil

et al. 2023

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Multiple sulfur isotopes and stratigraphic constraints for the 34S enrichments in the late Ediacaran-Cambrian pyrite-sulfur record: A product of supercontinent assembly and restricted seas

Caetano-Filho,

Sansjofre,

Paula-Santos

et al. 2024

Gondwana Research

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Paleoenvironmental redox evolution of Ediacaran-Cambrian restricted seas in the core of West Gondwana: Insights from trace-metal geochemistry and stratigraphy of the Bambuí Group, east Brazil

Cited by 3 publications

References 67 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

Trace elements in sedimentary pyrite track redox and nutrient fluctuations in the Ediacaran/Cambrian Bambuí Group, Brazil

Multiple sulfur isotopes and stratigraphic constraints for the 34S enrichments in the late Ediacaran-Cambrian pyrite-sulfur record: A product of supercontinent assembly and restricted seas

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