Sedimentological and Geochemical Characterization of the Lagoa Feia Formation, Rift Phase of the Campos Basin, Brazil

Trindade, L.A.F.; Dias, Jeferson Luiz; Mello, M.R.

doi:10.1007/978-3-642-78911-3_9

Cited by 14 publications

(4 citation statements)

References 13 publications

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“…Gypsum [CaSO 4 • 2H 2 O] and anhydrite [CaSO 4 ] have been documented as forming intra-sedimentary nodules during syn-sedimentary diagenetic events in alkaline lacustrine environments from Lagoa Feia Formation in Campos Basin (Bertani and Carozzi, 1985;Trindade et al, 1995). However, significant sulphate accumulations are apparently lacking within the lacustrine carbonate-dominated sag intervals in Campos, Santos and Kwanza Basins (Wright and Barnett, 2015;Saller et al, 2016).…”

Section: Mineral Paragenesismentioning

confidence: 99%

The hydrochemical evolution of alkaline volcanic lakes: a model to understand the South Atlantic Pre-salt mineral assemblages

Mercedes‐Martín¹,

Ayora

Tritlla

et al. 2019

Earth-Science Reviews

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Section: Mineral Paragenesismentioning

confidence: 99%

The hydrochemical evolution of alkaline volcanic lakes: a model to understand the South Atlantic Pre-salt mineral assemblages

Mercedes‐Martín¹,

Ayora

Tritlla

et al. 2019

Earth-Science Reviews

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“…conditions in the context of plate tectonics, as initiated by Tissot and Welte (1984), helps understanding the occurrence of organic-rich sediments. For instance, good source rocks deposited in the early phases of opening of the Atlantic ocean during Lower Cretaceous: the Bucomazi formation, Congo coastal basin (Burwood et al 1995), the La Luna and Querequal formations in Venezuela (Talwani 2002), and the Lagoa Feia formation in Campos basin, offshore Brazil (Trindade et al 1995). This helped exploration to find large accumulations in the Southern Atlantic presalt units.…”

Section: Originmentioning

confidence: 99%

Surface Geochemistry

Ludwig

Casey

2017

Encyclopedia of Earth Sciences Series

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De Chancourtois A-EB (1862) Mémoire sur un classement naturel des corps simples ou radicaux appelé vis tellurique. Comptes Rendus 54:757-761 Emsley J (2011) Nature's building blocks: everything you need to know about the elements. Oxford University Press, Oxford Goldschmidt VM (1925) Geochemische verteilungsgesetze der element, Part V. Isomorphie und polymorphie der sesquioxyde. Die lanthaniden kontraktion und ihre konsequenzen. Oslo Goldschmidt VM (1926) Geochemische verteilungsgesetze der elemente. Skrifter Norske Videnskaps. Akad, Oslo Goldschmidt VM (1937) The principles of distribution of chemical elements in minerals and rocks. The seventh Hugo Müller Lecture, delivered before the chemical society.

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“…The highest salt concentration at which such methanogenesis (from H 2 þ CO 2 ) occurs in nature is in the 88‰ bottom waters of Mono Lake, California (Fig. Modern halophilic methanogens can form rich microbial communities in the density-stratified waters of deep-seafloor brine lakes, including suprasalt allochthon areas on the deep Mediterranean seafloor where some anoxic bottom brines have evolved to the bittern stage (MgCl 2 saturation; van der Wielen et al, 2005). The resulting accumulation of hydrogen and volatile fatty acids (VFA) in saline sediment beneath brine columns more saline than this, implies that catabolism via interspecies hydrogen transfer hardly occurs at all in more hypersaline environments .…”

Section: Metabolism In Producers and Consumersmentioning

confidence: 99%

“…Trindade et al, 1995Mello & Maxwell, 1991 Evaporitic source rocks: mesohaline responses to cycles of "famine or feast" in layered brines 367 Ocean but evaporation in the shallow waters of the archipelago of islands and shoals created waters of increased salinity and in some cases local strong brines and evaporites, which sank and flowed as saline bottom currents (from 34-42‰) into deeper water. These organic-rich shales were deposited in anoxic brackish to saline lakes.…”

mentioning

confidence: 99%

Evaporitic source rocks: mesohaline responses to cycles of “famine or feast” in layered brines

Warren¹

2010

Quaternary Carbonate and Evaporite Sedimentary Facies and Their Ancient Analogues

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Organic matter in modern saline systems tends to accumulate in bottom sediments beneath a density-stratified mass of saline water where layered hydrologies are subject to oscillations in salinity and brine level. Organic matter is not produced at a constant rate in such systems; rather, it is generated in pulses by a halotolerant community in response to relatively short times of less stressful conditions (brackish to mesohaline) that occur in the upper part of the layered hydrology. Accumulations of organic matter can occur in any layered brine lake or epeiric seaway when an upper less-saline water mass forms on top of nutrient-rich brines, or in wet mudflats wherever waters freshen in and above the uppermost few millimetres of a microbial mat. A flourishing community of halotolerant algae, bacteria and archaeal photosynthesizers drives the resulting biomass bloom. Brine freshening is a time of "feast" characterized by very high levels of organic productivity. In a stratified brine column (oligotrophic and meromictic) the typical producers are planktonic algal or cyanobacterial communities inhabiting the upper mesohaline portion of the stratified water mass. In mesohaline holomictic waters, where light penetrates to the water bottom, the organic-producing layer is typically the upper algal and bacterial portion of a benthic laminated microbialite characterized by elevated numbers of cyanobacteria.Short pulses of extremely high productivity in the upper freshened part of a stratified brine column create a high volume of organic detritus settling through the column and/or the enhanced construction of benthic microbial mats in regions where freshened waters reach the hypersaline base of the column. With the end of the freshening event, ongoing intensely arid conditions mean that salinity, temperature and osmotic stress increase rapidly in the previously freshened water mass. This leads to a time of mass dieoff of the once flourishing mesohaline community ("famine"). First, these increasingly salty waters no longer support haloxene forms. Then, halotolerant life dies back, and finally by the halite precipitation stage, only a few halophilic archaea and bacteria remain in the brine column (typically acting as heterotrophs and fermenters). Repeated pulses of organic matter, created during a feasting event followed by a famine event, create laminated organic-enriched sediment on an anoxic bottom.There are three, possibly four, major mesohaline density-stratified settings where organic-rich laminites (petroleum source rocks) accumulated in ancient "famine or feast" saline settings: (1) basin-centre lows in marine-fed evaporitic drawdown basins, associated with basinwide evaporites; (2) mesohaline intra-shelf lows on epeiric platforms, associated with platform evaporites; (3) saline-bottomed lows in under-filled perennial saline lacustrine basins; (4) closed seafloor depressions in halokinetic deepwater marine slope and rise terrains. An inherently restrictive hydrology means that the same mesohaline settings show a prop...

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Sedimentological and Geochemical Characterization of the Lagoa Feia Formation, Rift Phase of the Campos Basin, Brazil

Cited by 14 publications

References 13 publications

The hydrochemical evolution of alkaline volcanic lakes: a model to understand the South Atlantic Pre-salt mineral assemblages

The hydrochemical evolution of alkaline volcanic lakes: a model to understand the South Atlantic Pre-salt mineral assemblages

Surface Geochemistry

Evaporitic source rocks: mesohaline responses to cycles of “famine or feast” in layered brines

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