Mineralogical and chemical composition of Ediacaran-Cambrian pelitic rocks of The Tamengo and Guaicurus formations, (Corumbá Group - MS, Brazil): Stratigraphic positioning and paleoenvironmental interpretations

Fazio, G.; Guimarães, Edi Mendes; Walde, Detlef W.G.; Carmo, Dermeval Aparecido do; Adôrno, Rodrigo Rodrigues; Vieira, Lucieth Cruz; Denezine, Matheus; Silva, Carolina Blois da; Godoy, Hygor Viana de; Borges, Patrícia Caixeta; Pinho, David

doi:10.1016/j.jsames.2018.11.025

Cited by 8 publications

(14 citation statements)

References 37 publications

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“…10A). The defining criteria that led to the classification of a ramp depositional system for the Tamengo Formation includes the lateral continuity of facies and the absence of any facies that suggest build‐up of an extensive, steep‐sided, rimmed platform (Fazio et al ., 2018; Oliveira et al ., 2019).…”

Section: Discussionmentioning

confidence: 99%

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Sedimentary facies, fossil distribution and depositional setting of the late Ediacaran Tamengo Formation (Brazil)

et al. 2020

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Mixed carbonate-siliciclastic deposits of the Tamengo Formation (terminal Ediacaran), record the rise of calcifying metazoans and the origin of exoskeletons in animals. To explore the relationships between environmental setting and the first appearance of calcified metazoans and their ecology, this study presents detailed sedimentological and stratigraphic data of eight sections that capture the final stages of the Ediacaran (550 to 543 Ma). This study combines stratigraphic characterization with detailed facies descriptions and evaluates lateral heterogeneity and overall ramp sedimentation integrated with fossil distribution. The Tamengo Formation represents a storm-dominated ramp. The outer to mid-ramp is composed of very finegrained siliciclastic rocks containing Corumbella body fossils and thinbedded mudstone/wackestone containing Cloudina. The mid-inner ramp is dominated by wackestone/packstone with abundant Cloudina skeletal debris and ooid packstone/grainstone shoal deposits. Locally, fragments of Corumbella and Cloudina are found on the same horizon, which is a result of their high accumulation rate, resulting from the reworking and mixing of epifaunal organisms. In spite of taphonomic biases, the general distribution of Corumbella and Cloudina across the unit suggests that these organisms have been transported across ramp and/or probably show a differential response of fauna preservation. When compared to other occurrences worldwide, this dataset indicates an already complex ecosystem in the Ediacaran, where these early animals were capable of adapting to specific environmental niches.

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Section: Discussionmentioning

confidence: 99%

“…4A). F1 is composed of quartz, smectite, chlorite and illite as major components (Fazio et al ., 2018). F1 can be fissile as well as display a well‐developed very thin lamination.…”

Section: Facies Analysismentioning

confidence: 99%

Sedimentary facies, fossil distribution and depositional setting of the late Ediacaran Tamengo Formation (Brazil)

et al. 2020

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“…The limestone succession is interrupted by few centimeter to decimeter thick beds of shales and marls, formed by clay to silt-size detrital grains, especially quartz, with massive to finely laminated structures and variable carbonate, occurring as cement or microscopic nodules (Figure 5E). Fazio et al (2019) noted also the presence of gypsum pseudomorphs.…”

Section: Corcal Sectionmentioning

confidence: 90%

“…deposited in a deeper environment, below the storm wave base (Boggiani, 1998;Gaucher et al, 2003;Oliveira, 2010). The boundary between the Tamengo and Guaicurus formations is still controversial, as it probably contains a hiatus and then the transition to the Cambrian (Adôrno et al, 2019a;Fazio et al, 2019).…”

Section: Geological Setting and Lithostratigraphymentioning

confidence: 99%

“…The average sample spacing resulted of ~20 cm. Some intervals were completed using the lithostratigraphic logs of Adôrno et al (2017) and Fazio et al (2019), as highlighted in Figures 2, 3. This choice was taken for intervals that were already sufficiently detailed in these previous studies, or that were not possible to access.…”

Section: Fieldwork and Lithostratigraphymentioning

confidence: 99%

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New Facies Model and Carbon Isotope Stratigraphy for an Ediacaran Carbonate Platform From South America (Tamengo Formation—Corumbá Group, SW Brazil)

et al. 2022

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The Ediacaran is a period characterized by the diversification of early animals and extensive neritic carbonate deposits. These deposits are still not well understood in terms of facies and carbon isotope composition (δ13C). In this study we focus on the Tamengo Formation, in southwestern Brazil, which constitutes one of the most continuous and well-preserved sedimentary record of the late Ediacaran in South America. We present new detailed lithofacies and stable isotopes data from two representative sections (Corcal and Laginha) and revise the paleoenvironmental and stratigraphic interpretation of the Tamengo Formation. The Corcal section consists of neritic deposits including shallow-water limestone beds, alternated with shale and subordinate marl beds. These facies yield specimens of the Ediacaran fossils Cloudina lucianoi and Corumbella werneri. On the other hand, the Laginha section shows more heterogeneous facies, such as impure carbonates, breccias, marls, and subordinate mudstone beds, as well as no evidence of Corumbella werneri. The stable carbon isotope record is also different between the two sections, despite belonging to the same unit. The Corcal section displays higher and more homogeneous δ13C values, consistent with those of Ediacaran successions worldwide. The Laginha section, instead, displays more variable δ13C values, which suggest the influence of local and post depositional processes. The difference between the two sections was attributed to the different distance from the shore. We propose that the difference is due to topographic variations of the continental platform, which, at the Laginha site, was steeper and controlled by extensional faults. Therefore, the Corcal section is a better reference for the Tamengo Formation, whereas the Laginha is more particular and influenced by local factors. Besides, the lithofacies associations of the Tamengo Formation are like those of the Doushantuo and Dengying formatios, in South China, with no significant biogenic carbonate buildups, and different from those of other important Ediacaran units, such as the Nama Group in Nmibia and the Buah Formation in Oman. Our work highlights the complexity and heterogeneity of Ediacaran carbonate platforms and of their carbon isotopic composition. In addition, we characterize the Corcal section as a possible reference for the Ediacaran in South America.

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A shift in redox conditions near the Ediacaran/Cambrian transition and its possible influence on early animal evolution, Corumbá Group, Brazil

Caxito,

Sperling,

Fazio

et al. 2024

Geoscience Frontiers

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Mineralogical and chemical composition of Ediacaran-Cambrian pelitic rocks of The Tamengo and Guaicurus formations, (Corumbá Group - MS, Brazil): Stratigraphic positioning and paleoenvironmental interpretations

Cited by 8 publications

References 37 publications

Sedimentary facies, fossil distribution and depositional setting of the late Ediacaran Tamengo Formation (Brazil)

Sedimentary facies, fossil distribution and depositional setting of the late Ediacaran Tamengo Formation (Brazil)

New Facies Model and Carbon Isotope Stratigraphy for an Ediacaran Carbonate Platform From South America (Tamengo Formation—Corumbá Group, SW Brazil)

A shift in redox conditions near the Ediacaran/Cambrian transition and its possible influence on early animal evolution, Corumbá Group, Brazil

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