Biomarkers in Cretaceous sedimentary rocks from the Codó Formation - Parnaíba Basin: Paleoenvironmental assessment

Sousa, Edymilaís da Silva; Júnior, Gustavo R. Sousa; Silva, Andrenilton F.; Reis, Francisco de A.M.; Sousa, Alek A.C. de; Cioccari, Giovani Matte; Capilla, Ramsés; Souza, Igor Viegas Alves Fernandes de; Imamura, Paulo M.; Rodrigues, R. F.; Lopes, José Arimateia Dantas; Lima, Sidney Gonçalo de

doi:10.1016/j.jsames.2019.03.025

Cited by 14 publications

(3 citation statements)

References 23 publications

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“…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%

“…Lindoso et al (2016), studying fossil fish assemblages recovered from outcrops near Brejo town, Maranhão State, inferred a restricted lacustrine environment with little marine influence. Sousa et al (2019), through analyzes of the composition of organic matter and biomarkers, identified a saline to hypersaline paleoenvironment, with the influence of organic matter of marine origin. Bastos et al (2022) conducted a study involving biomarkers, nitrogen isotopes and organic carbon isotopes, revealing a sequence of events within the Codó Formation.…”

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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“…Gammacerane is an important biomarker and may derive from tetrahymanols, which are existed in marine sediments (El-Sabagh et al, 2020;Martins et al, 2020). High gammacerane contents are typical of high-salinity environments and commonly result from hypersalinity and suboxidation at depth (Sousaa et al, 2019). Therefore, the abundance of gammacerane can be used to recognize the existence of stratified water columns in the hydrocarbon generation environments of marine and nonmarine organic matter (Holba et al, 2003).…”

Section: Depositional Environmentsmentioning

confidence: 99%

Geochemical and Petrographic Characterization of Marine-Continental Transitional Facies Shale (Qilian Basin, China): Origin of Organic Matter Input, Depositional Environments and Hydrocarbon Generation Potential

Wang

Sun

et al. 2021

Front. Earth Sci.

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This study, for the first time, investigates the source, keroger pattern, evolution degree, sedimentary environment, and evaluates the hydrocarbon generating ability of marine-continental transitional facies shale from the Ebao area of the Qilian Basin in western China. The organic-rich shales of the marine-continental transitional facies were subjected to total organic carbon (TOC), rock pyrolysis, the biomarkers and kerogen microscopy analyses. The kerogen microscopy analyses indicated that the sample from ZK001 well and ZK2002 well had a mass of vitrinite and small number of exinite, so kerogen type was mainly humic. According to vitrinite reflectance, the organic matter was in the stage of maturity to high maturity. The organic analyses indicated that the shale samples possessed the features of the higher TOC and a mixed of terrestrial and marine sources and maturity to high maturity. These features were compatible with the characterized of kerogen microscopy characteristics. A lot of organic materials in the studied shales form ZK001 well and ZK2002 well could be because there were fine protection under salt lake facies and hypoxic marine environment. Therefore, the studied shales of marine-continental transitional facies shale had very good hydrocarbon generating ability as a result of the existence of a lot of high maturity organic materials of humic.

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Organic matter deposition and paleoenvironmental implications across the Cenomanian-Turonian boundary of the Subalpine Basin (SE France): Local and global controls

Fonseca

Filho

Lézin

et al. 2020

International Journal of Coal Geology

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Biomarkers in Cretaceous sedimentary rocks from the Codó Formation - Parnaíba Basin: Paleoenvironmental assessment

Cited by 14 publications

References 23 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

Geochemical and Petrographic Characterization of Marine-Continental Transitional Facies Shale (Qilian Basin, China): Origin of Organic Matter Input, Depositional Environments and Hydrocarbon Generation Potential

Organic matter deposition and paleoenvironmental implications across the Cenomanian-Turonian boundary of the Subalpine Basin (SE France): Local and global controls

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