Environmental conditions of deposition of the Lower Cretaceous lacustrine carbonates of the Barra Velha Formation, Santos Basin (Brazil), based on stable carbon and oxygen isotopes: A continental record of pCO2 during the onset of the Oceanic Anoxic Event 1a (OAE 1a) interval?

Pietzsch, Raphael; Tedeschi, Leonardo R.; Oliveira, Daniel Martins de; Anjos, Camila Wense Dias dos; Vazquez, Joselito C.; Figueiredo, Milene Freitas

doi:10.1016/j.chemgeo.2019.119457

Cited by 39 publications

(36 citation statements)

References 49 publications

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“…Recent work has also implied that synthetic versions of these lakes can help combat global climate change by assisting in the production of algal biofuels [13]. Meanwhile, the discovery of vast hydrocarbon reservoirs in ancient alkaline lake deposits on the south Atlantic coastal margins has prompted renewed interest in these systems from energy producers [14][15][16][17][18][19][20][21][22]. Altogether, the diversity of researchers studying alkaline lakes and their deposits demonstrates that these systems are dynamic, biogeochemical hotspots worthy of continued study.…”

Section: Introduction 1motivation and Direction Of The Reviewmentioning

confidence: 99%

A Series of Data-Driven Hypotheses for Inferring Biogeochemical Conditions in Alkaline Lakes and Their Deposits Based on the Behavior of Mg and SiO2

2021

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Alkaline (pH > 8.5) lakes have been common features of Earth’s surface environments throughout its history and are currently among the most biologically productive environments on the planet. The chemistry of alkaline lakes favors the deposition of aluminum-poor magnesian clays (e.g., sepiolite, stevensite, and kerolite) whose chemistry and mineralogy may provide a useful record of the biogeochemistry of the lake waters from which they were precipitated. In this forward-looking review, we present six data-driven, testable hypotheses devoted to furthering our understanding of the biogeochemical conditions in paleolake waters based on the geochemical behavior of Mg and SiO2. In the development of these hypotheses, we bring together a compilation of modern lake water chemistry, recently published and new experimental data, and empirical, thermodynamic, and kinetic relationships developed from these data. We subdivide the hypotheses and supporting evidence into three categories: (1) interpreting paleolake chemistry from mineralogy; (2) interpreting the impact of diatoms on alkaline lake sedimentation; and (3) interpreting depositional mineralogy based on water chemistry. We demonstrate the need for further investigation by discussing evidence both for and against each hypothesis, which, in turn, highlights the gaps in our knowledge and the importance of furthering our understanding of the relevant geological and biological systems. The focused testing of these hypotheses against modern occurrences and the geologic record of alkaline lakes can have profound implications for the interpretation of the paleo-biogeochemistry and paleohabitability of these systems on Earth and beyond.

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Section: Introduction 1motivation and Direction Of The Reviewmentioning

confidence: 99%

A Series of Data-Driven Hypotheses for Inferring Biogeochemical Conditions in Alkaline Lakes and Their Deposits Based on the Behavior of Mg and SiO2

2021

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“…(B) Carbonate facies associations (FAs) from the Crato Formation. (C) Aptian successions from the Parnaíba, Campos and Santos basins (information from Bahniuk et al ., 2015; Lima et al ., 2020; Pietzsch et al ., 2020).…”

Section: Discussionmentioning

confidence: 99%

“…Strontium isotope ratios (0.7134 to 0.7137) suggest that the Pre‐Salt sag reservoirs of the Santos and Campos basins were deposited in a lacustrine system (Tedeschi et al ., 2017; Pietzsch et al ., 2018, 2020; Farias et al ., 2019), even though the salt above is tentatively assigned to marine deposition (see Szatimari & Milani, 2016, and references therein). No correlation between δ 13 C and δ 18 O values is observed in the Santos–Campos section (see Fig.…”

Section: Discussionmentioning

confidence: 99%

“…No correlation between δ 13 C and δ 18 O values is observed in the Santos–Campos section (see Fig. 19); however, facies analysis and mineralogy content are suggestive of deposition in shallow and endorheic conditions (Pietzsch et al ., 2020). Although 87 Sr/ 86 Sr measurements are still lacking for the Crato Formation deposits, and the carbon isotope values of the limestones are more variable than those measured for the Campos Basin, the carbonate sections of both basins share analogue conditions (i.e.…”

Section: Discussionmentioning

confidence: 99%

“…The Aptian Cod o Formation (Parna ıba Basin), also in the north-eastern Brazilian interior, bears carbonate deposits that can be correlated with those of the Crato Formation (Varejão et al, 2016). There, microbialites developed in a closed lacustrine system with d 18 O between Bahniuk et al, 2015;Lima et al, 2020;Pietzsch et al, 2020).…”

Section: Implications For a Pre-salt Analoguementioning

confidence: 99%

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Mixed siliciclastic–carbonate sedimentation in an evolving epicontinental sea: Aptian record of marginal marine settings in the interior basins of north‐eastern Brazil

et al. 2021

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The Aptian evaporitic transitional sequence (sag phase) of the Brazilian marginal basins records the first connection between the Central and South Atlantic oceans in the equatorial area. During this phase, lacustrine carbonate reservoirs and giant salt deposits developed in the southern basins of Santos and Campos, forming world-class petroleum reservoirs. The sag succession is also well-preserved in the interior rift basins of north-eastern Brazil, where upper Aptian strata are represented by a continuous section. This contribution presents an interpretation of the evolution of a third-order depositional sequence comprising lacustrine limestones, marine siliciclastic facies and evaporite deposits of the intracontinental Araripe Basin. The Lowstand Systems Tract is characterized by fluvial deposits filling accommodation generated during the syn-rift phase. The overlying deposits comprise marine facies with preservation of dinoflagellates and marine ichnotaxa, evidencing marine deposition in bayhead delta settings. The transgressive surface is represented by limestones, including the Konservat-Lagerst€ atte laminites, onlapping the basement rocks. Above, tide-dominated bay deposits with distinct subtidal, intertidal and supratidal portions are recorded. The Maximum Flooding Surface is a dark shale below foreshore to shoreface facies, marking the beginning of the Highstand Systems Tract, culminating with deposition of evaporites (gypsum and anhydrite). The stratigraphic architecture and palaeocurrents measured in different facies associations suggest that marine waters reached the basin from the south. The data unequivocally records late Aptian marine ingressions of an incipient South Atlantic Ocean over the interior basins of north-eastern Brazil, while lacustrine conditions were still prevailing in the Pre-Salt sag units of the Santos and Campos basins.

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The role of phosphate on non-skeletal carbonate production in a Cretaceous alkaline lake

Pietzsch

Tosca

Gomes

et al. 2022

Geochimica et Cosmochimica Acta

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Environmental conditions of deposition of the Lower Cretaceous lacustrine carbonates of the Barra Velha Formation, Santos Basin (Brazil), based on stable carbon and oxygen isotopes: A continental record of pCO2 during the onset of the Oceanic Anoxic Event 1a (OAE 1a) interval?

Cited by 39 publications

References 49 publications

A Series of Data-Driven Hypotheses for Inferring Biogeochemical Conditions in Alkaline Lakes and Their Deposits Based on the Behavior of Mg and SiO2

A Series of Data-Driven Hypotheses for Inferring Biogeochemical Conditions in Alkaline Lakes and Their Deposits Based on the Behavior of Mg and SiO2

Mixed siliciclastic–carbonate sedimentation in an evolving epicontinental sea: Aptian record of marginal marine settings in the interior basins of north‐eastern Brazil

The role of phosphate on non-skeletal carbonate production in a Cretaceous alkaline lake

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