Extractable and pyrolyzed hydrocarbons in shallow-water carbonate sediments, Florida Bay, Florida

Mitterer, Richard M.; Dzou, I.P; Miranda, Rui; Caughey, Michael

doi:10.1016/0146-6380(88)90047-2

Cited by 9 publications

(3 citation statements)

References 25 publications

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“…The amount of carbonate is not the only factor which explains the differences between the different sediments, since the calcimetry is not statistically different for the 0-200 µm fraction (one-way ANOVA, p-value 0.5493 between the two sediment types). The organic matter content of the bivalve and gastropod shells is usually low (smaller than 0.5%; [66]). Part of the organic matter present in the bioclastic accumulations is incorporated during the biomineralisation of the shell, and mostly composed of matrix proteins, glycoproteins, and polysaccharides [67].…”

Section: Preserved Organic Matter Quantitative Aspectmentioning

confidence: 99%

“…In comparison, the Cayo Coco lagoons, with a similar setting as those in Abu Dhabi, have a TOC content up to 5.4%. Depending on the initial pool of organic matter and remineralisation by microorganisms, the amount of organic matter within the micritic muds can be significantly higher than the bioclastic sands, and are made up of greater variety of organic molecules [66]. Physical processes can possibly explain the differences between fine micritic muds and coarser bioclastic sands: wind-induced waves are the main driver in sediment transport in shallow (micro-tidal) coastal lagoons [74].…”

Section: Preserved Organic Matter Quantitative Aspectmentioning

confidence: 99%

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Microbial Origin of the Organic Matter Preserved in the Cayo Coco Lagoonal Network, Cuba

et al. 2020

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The southern part of the tropical Cayo Coco Island (Cuba) hosts a complex, highly evaporative and marine-fed lagoonal network. In the easternmost lagoon of this network, hypersaline conditions favour the development of complex sedimentary microbial ecosystems within the water column at the bottom water-sediment interface and on the shore. Some of these ecosystems are producing microbial mats and biofilms with variable mineralisation rates, depending on their location. Since the mineralisation of these microbial deposits is rare, the sedimentary record does not provide a direct window on the evolution of these ecosystems or their distribution through space and time. However, microbial deposits also produce copious amounts of organic matter, which may be used to decipher any microbial-related origin within the sedimentary record. Microbial mats and biofilms were identified as the potential source of organic material in addition to the surrounding mangrove, soils and suspended particulate matter (SPM). The origin and evolution of the sedimentary organic matter preserved within the lagoonal sediments has been analysed using geochemical parameters such as elemental (TOC, TN and [C/N]atomic ratio) and isotopic (δ13Corg and δ15NTN) signals on four sedimentary cores retrieved from different locations in the lagoon and compared with the geochemical signatures of the potential sources. Despite the high potential for organic matter accumulation in the studied lagoon, the TOC and TN downcore values in sediments that were analysed (i.e., micritic muds and bioclastic sands) remain very low compared to the sediment-water interface. The relative contributions of the different potential sources of organic matter were estimated using [C/N]atomic ratios and δ13Corg values. The δ15NTN signature was discarded as a source signature as it records synsedimentary, early diagenetic, secondary evolution of the nitrogen signal associated with OM remineralisation (i.e., denitrification). Finally, among the microbial deposits, the slime recognised in the permanently submersed zone of the waterbody appears to be the main contributor to the organic matter preserved within the sediments of the lagoon. SPM, mainly composed of microbial-rich particles, also contribute and cannot be ruled out as a source.

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Section: Preserved Organic Matter Quantitative Aspectmentioning

confidence: 99%

Section: Preserved Organic Matter Quantitative Aspectmentioning

confidence: 99%

Microbial Origin of the Organic Matter Preserved in the Cayo Coco Lagoonal Network, Cuba

et al. 2020

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“…The average TOC value of Salt Flat evaporites is lower than that of modern shallow-water carbonate sediments (average 1.0%) from Florida Bay (Mitterer et al, 1988). The average TOC value of Salt Flat evaporites is about two times higher than the average TOe value (0.24%) in carbonate rocks reported by Gehman (1962).…”

Section: Methodsmentioning

confidence: 64%

Source rock potential of shallow-water evaporites: An investigation in holocenepleistocene Salt Flat sabkah (playa), west Texas-New Mexico

Hussain

Warren

1991

Carbonates Evaporites

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Source rock potential of the shallow-waterevaporite-carbonate sequences at Salt Flat sabkha (playa) was evaluated on the basis of total organic carbon TOC), extractable organic matter and Rock Eval pyrolysis.Sedimentologicalevidenceindicatesperiodic anoxicity in the Salt Flat brine lake during evaporite deposition. Thiswascausedduring wetter intervals when inflowingrunoff rested on denser brine, forming a halocline. Brine stratification inhibited free circulation of oxygen in the lake bottom, enhancing the preservation of organic matter.

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Chemical Methods for Assessing Kerogen and Protokerogen Types and Maturity

Whelan¹,

Thompson-Rizer²

1993

Topics in Geobiology

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Extractable and pyrolyzed hydrocarbons in shallow-water carbonate sediments, Florida Bay, Florida

Cited by 9 publications

References 25 publications

Microbial Origin of the Organic Matter Preserved in the Cayo Coco Lagoonal Network, Cuba

Microbial Origin of the Organic Matter Preserved in the Cayo Coco Lagoonal Network, Cuba

Source rock potential of shallow-water evaporites: An investigation in holocenepleistocene Salt Flat sabkah (playa), west Texas-New Mexico

Chemical Methods for Assessing Kerogen and Protokerogen Types and Maturity

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