The early diagenesis of aliphatic hydrocarbons and organic matter in sedimentary particulates from Dabob Bay, Washington

Prahl, Fredrick G.; Bennett, J.T.; Carpenter, Roy

doi:10.1016/0016-7037(80)90196-9

Cited by 308 publications

(126 citation statements)

References 27 publications

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“…This is because freshwater systems have a wide range inorganic δ 13 C values (-15 to 0‰ PDB: Boutton, 1991) compared to marine systems. Other specific indicators of organic source, such as steroid compounds and planktonic organisms, has a C/N ratio of 6 to 9 (Bordowskiy, 1965a;Prahl et al, 1980;Biggs et al, 1983). In contrast, terrestrial vascular plants and their derivates in sediments have C/N ratios of 15 or higher (Bordowskiy, 1965b;Ertel and Hedges, 1984;Post et al, 1985;Ertel et al, 1986;Hedges et al, 1986;Orem et al, 1991).…”

Section: Introductionmentioning

confidence: 99%

C/N ratios in a sediment core from Nakaumi Lagoon, southwest Japan. Usefulness as an organic source indicator.

2001

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The weight ratio of total organic carbon to total nitrogen (C/N ratio) in 20 meters of sediment core from Nakaumi Lagoon (coastal brackish lake), Japan is examined for its suitability as an organic source indicator. The C/N ratio depth profile is compared to the depth profiles of other proxies, i.e., weight ratio of total organic carbon to total organic nitrogen (C/N org. ratio), stanol compositions, n-alkane compositions and the hydrogen-index by Rock-Eval pyrolysis.The C/N ratios of the lagoonal sediments, which have been deposited over the last ca. 8,000 years, have a different profile from that of the C/N org. ratio and other proxies due to the effects of a constant level of inorganic nitrogen (N inorg. : ca. 0.04%) in the sediments. When C org. content is less than 1 wt%, the presence of N inorg. lowers the C/N ratio considerably, giving an inaccurate indication of organic source. C-N and C/N ratio-C org. plots are useful for evaluating the effect of N inorg. ; if the depth profiles of the C/N ratio and C org. content exhibit similar trends, this is taken as a warning that the apparent variation in the C/N ratio should be carefully examined in conjunction with the other plots and proxies. It is also found that the C/N org. ratio itself also tends to increase due to the preferential decomposition of nitrogen compounds, and that in sediments containing high proportions of planktonic organic matter (OM), the sensitivity of the C/N ratio to changes in the proportions of planktonic-terrestrial OM is relatively low. lignin phenols, are not easily analyzed due to chemical complexity. Hence, the C/N ratio, having recently become easier to obtain through the popularization of rapid elemental analysis techniques, appears to be an effective and simple indicator of organic source, particularly in lacustrine depositional environments, including estuaries.The C/N ratio in aquatic systems is governed by the mixing of terrestrial and autochthonous OM

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Section: Introductionmentioning

confidence: 99%

C/N ratios in a sediment core from Nakaumi Lagoon, southwest Japan. Usefulness as an organic source indicator.

2001

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“…tively (Schubert and Calvert, 2001;Prahl et al, 1980). HF4-18 has an average C/N values of 6.99 (5.4-8.96, n = 30), i.e., close to 5.65 ± 1.86 (n = 12) which represents the value of fresh sea bird droppings and seal feces in the Antarctic region.…”

Section: Fig 4 Correlations Between Total Organic Carbon (Toc) Totmentioning

confidence: 92%

A preliminary study of elemental geochemistry and its potential application in Antarctic Seal palaeoecology

et al. 2005

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The elemental geochemical composition of sediments influenced by seal excrements in the Antarctic Fildes Peninsula has been examined in order to establish the source of organic matter, identify potential bio-elements and explore their potential palaeoecological implications. The combination of total organic carbon concentration (TOC), total nitrogen concentration (TN), organic carbon isotope (d 13 C) and atomic C/N ratio shows that the organic matter in the sediments with many seal hairs has a marine origin, predominantly derived from seal excrements. Among the determined element/ oxide concentrations, S, Se, F, Zn, Hg, FeO and P 2 O 5 were found to be remarkably enriched in the sediments influenced by seal excrements with respect to the sediments with few or without seal hairs, and their concentrations displayed strong and positive correlations with organic matter abundance, indicating that they had the same source and transportation mechanism as the in situ organic material. A comparison of these element/oxide concentrations with the seal hair numbers showed that they had similar distribution patterns with depth, and the correlations were positive and statistically significant. Based upon these results, S, Se, F, Zn, Hg, FeO and P 2 O 5 in the seal excrement sediments were identified as potential bio-elements and their concentrations could potentially be used as inorganic geochemical indicators for tracking seal palaeoecological processes in the Antarctic region.

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“…Proteins account for the greatest part of the OM in organisms, together with lipids and carbohydrates, but the proportional abundance varies. Thus, C/N provides information about the proportion of algal and land plant contribution to OM (Prahl et al, 1980;Meyers, 1994;Kaushal and Bindford, 1999). OM derived from lake algae has atomic C/N values typically between 4 and 10, whereas vascular plants usually have values of 20 and greater (Ertel and Hedges, 1985;Hedges et al, 1986;Meyers, 1994).…”

Section: Cjn Ratiomentioning

confidence: 99%

Lipid biomarkers in Lake Enol (Asturias, Northern Spain): Coupled natural and human induced environmental history

Ortíz

Sánchez‐Palencia

Torres

et al. 2016

Organic Geochemistry

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The early diagenesis of aliphatic hydrocarbons and organic matter in sedimentary particulates from Dabob Bay, Washington

Cited by 308 publications

References 27 publications

C/N ratios in a sediment core from Nakaumi Lagoon, southwest Japan. Usefulness as an organic source indicator.

C/N ratios in a sediment core from Nakaumi Lagoon, southwest Japan. Usefulness as an organic source indicator.

A preliminary study of elemental geochemistry and its potential application in Antarctic Seal palaeoecology

Lipid biomarkers in Lake Enol (Asturias, Northern Spain): Coupled natural and human induced environmental history

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