Alternations of open and closed lakes in the Lower Aptian Codó Formation (Parnaíba Basin, Brazil)

Bobco, Fabia Emanuela Rafaloski; Trombetta, Mariane Cristina; Ferreira, Laís de Oliveira; Silveira, Luís Fernando; Kroth, Mateus; Mendonça, Joalice de Oliveira; Filho, João Graciano Mendonça; Sedorko, Daniel; Araújo, Bruno César; Borghi, Leonardo

doi:10.1016/j.sedgeo.2023.106478

Cited by 6 publications

(2 citation statements)

References 88 publications

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“…This way, the lagoon could largely retain the relatively stable, higher salinities, despite intermittent fluvial inflow and introduction of non-marine ostracod faunal elements indicative of lower salinities." Bobco et al (2023), using a multiproxy approach, identified five depositional stages: expanded lake, brackish ephemeral lake, perennial shallow lake, evaporitic sabkha, and stratified lake. They also proposed alternating between open, semi-closed, and closed lakes, with occasional marine incursions.…”

Section: Paleoenvironmentsmentioning

confidence: 99%

“…Despite the work already done, there is still no clear understanding of the paleoenvironmental evolution of the Codó Formation. In general, the studies have identified a lacustrine system with occasional marine incursions, generally at the top Antonioli & Arai, 2002;Bastos et al, 2014Bastos et al, , 2022Lindoso et al, 2016;Sousa et al, 2019;Bobco et al, 2023). On the other hand, some works recognized a lacustrine paleoenvironment without direct marine influence (Paz & Rossetti, 2001;Bahniuk et al, 2015).…”

Section: Paleoenvironmentsmentioning

confidence: 99%

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The critical role of accurate fossil identification: the case of the ostracods of the Codó Formation, NE Brazil

Coimbra,

Petró

2023

Rev. bras. paleontol.

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The Class Ostracoda comprises bivalve microcrustaceans with great diversity and abundance in the Lower Cretaceous paleolakes of Brazil and the world. With species generally well-preserved and of relatively short biochrons, it has provided high-resolution biostratigraphic frameworks that permit long-distance correlations. In this context, the Lower Cretaceous biozones of the NE Brazilian basins have allowed the establishment of correlations between coeval geological sections not only in this region but also with those of the Brazilian marginal basins, including the rocks of the pre-salt deposits, as well as with West African basins. In addition to biostratigraphy, these microfossils have proved indispensable in paleoenvironmental and paleogeographical analyses, including studies on the opening of the South Atlantic Ocean. However, some publications have emerged that, regrettably, exhibit errors in species identification and/or the accurate interpretation of biostratigraphic works. These mistakes have led to proposed modifications in both the biochron and geographic distribution of index taxa and taxonomic synonymizations that are incongruent with the current state of knowledge of the species. Consequently, these inaccuracies have given rise to erroneous biochronostratigraphic correlations and paleoenvironmental inferences. In this context, we meticulously examine the current understanding of the taxonomy of ostracods from the Codó Formation (NE Brazil), which is essential for the debate on the use of Lower Cretaceous ostracods in stratigraphy. Keywords: biostratigraphy, paleoecology, microfossils, Lower Cretaceous, Brazil.

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Section: Paleoenvironmentsmentioning

confidence: 99%

Section: Paleoenvironmentsmentioning

confidence: 99%

The critical role of accurate fossil identification: the case of the ostracods of the Codó Formation, NE Brazil

Coimbra,

Petró

2023

Rev. bras. paleontol.

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Advances in Limnogeology: The lake‐basin‐type model revisited 25 years after…anomalies, conundrums and upgrades

Benavente,

Bohacs

2024

The Depositional Record

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The lake‐basin‐type model classified the stratigraphic record of ancient lake systems according to rates of potential accommodation relative to sediment + water supply. The model convolved all modes and paths of water supply (direct fall, surficial, subsurface) with amounts and types of sediment supply (clastic, biogenic, chemical) into a single basin‐filling volume term (sediment + water); its major strength was its widespread applicability. This was supported by subsequent investigations confirming the utility of this approach, but it also revealed some important limitations due to simplifications in the original model. The model has been expanded here to address all inland waters (lakes, ponds, wetlands, playas) as well as adding two major subdivisions of the sediment + water term: (1) water supply paths and (2) the volume of water supply relative to sediment supply. Water supply flow paths in the subsurface are subdivided into ‘throughflow’, ‘recharge’ and ‘discharge’. Each of these groundwater hydrology states can be defined quite precisely by the ratio of net outflow to inflow, from persistently open to consistently closed. These paths can be deciphered using stable carbonate and oxygen isotope composition of primary lacustrine limestones, detailed sedimentology, stratigraphy, palaeontology and mineralogy. Distinguishing water supply paths provides additional insights into playa systems and the occurrence and character of evaporites and carbonates. The volume ratio of water to sediment supply most directly influences the water depths of lakes, ponds and wetlands, which affect water body hydrodynamics and ecosystem behaviour as well as the details of stratal stacking and depositional sequences. It helps fine‐tune estimates of the distribution of sediment texture, bedding, composition and organic matter content. The aim of this contribution is to address questions about the fundamental types of inland water bodies and to explain the new lake‐basin subtypes and provide examples that illustrate their potential to enable higher‐resolution, robust analysis of inland water systems and their stratigraphic records.

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Tracking environmental changes in an Early Cretaceous epicontinental sea: Sedimentology and geochemistry of the Romualdo Formation (Araripe Basin, NE Brazil)

Ferreira,

Chagas,

Bobco

et al. 2025

Cretaceous Research

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Alternations of open and closed lakes in the Lower Aptian Codó Formation (Parnaíba Basin, Brazil)

Cited by 6 publications

References 88 publications

The critical role of accurate fossil identification: the case of the ostracods of the Codó Formation, NE Brazil

The critical role of accurate fossil identification: the case of the ostracods of the Codó Formation, NE Brazil

Advances in Limnogeology: The lake‐basin‐type model revisited 25 years after…anomalies, conundrums and upgrades

Tracking environmental changes in an Early Cretaceous epicontinental sea: Sedimentology and geochemistry of the Romualdo Formation (Araripe Basin, NE Brazil)

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