The fractionation of a Recent sediment for organic geochemical analysis

Thompson, S.; Eglinton, G.

doi:10.1016/0016-7037(78)90132-1

Cited by 112 publications

(56 citation statements)

References 11 publications

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“…Bacteria were (Russell-Hunter, 1970). Ratios in this range have been found in previous studies where either terrestrial soils (Cameron and Posner, 1979;Turchenek and Oades, 1979) or aquatic sediments (Thompson and Eglinton, 1978;Tanoue and Handa, 1979) were fractionated; even lower values (2 to 6) have been reported for bulk samples of deep-sea sediments (Miiller, 1977) while some near-shore surface sediments had values between 3 and 25 with about 40 % of the samples between 5.5 and 8.5 (Bader, 1955). The composition of most of the organic matter from the sediments sampled during this study is unknown, but assuming a C : N ratio of 3.5 for bacteria (R. L. Ferguson, unpub.…”

Section: Particle S I Z E (Pm)supporting

confidence: 72%

Effect of Particle Size on Organic Content and Microbial Abundance Within Four Marine Sediments

Cammen¹

1982

Mar. Ecol. Prog. Ser.

109

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Sieved size fractions of 4 marine sediments were examined for 4 quantities presumably related to nutritional value -organic carbon, bacteria, chlorophyll a and C : N ratio of organic matterin order to determine whether they showed a consistent relation with particle size. However, there was no predictable relationship between these quantities and particle size either within or among the 4 sediments. Despite wide variations in organic carbon, bacterial abundance and chlorophyll a content, C : N ratios were similar (near 7) for most of the size fractions from all 4 areas; apparently there was a large, and as yet unidentified, pool of organic carbon in these sediments other than living bacteria or microalgae with a C : N ratio near 7. Variation of microbial abundance between winter and summer was inconsistent, but bacteria always accounted for less than 2 % of the organic carbon in the sediment. This study emphasizes the difficulty in attempting to predict nutritional value of sediments from bulk samples.

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Section: Particle S I Z E (Pm)supporting

confidence: 72%

Effect of Particle Size on Organic Content and Microbial Abundance Within Four Marine Sediments

Cammen¹

1982

Mar. Ecol. Prog. Ser.

109

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“…The A~4C values may also be a function of sedimentary grain size. Coarse particles are rich in fresh plant debris while fine-grained particles contain more fossil organic matter (THOMPSON and EGLINTON, 1978). ThUS one might expect that At4C values would vary at any given sediment depth depending on grain size.…”

Section: Origin Of Al4c Gradients In Mid-basin and Shelf Organic Phasmentioning

confidence: 99%

Isotopic signatures (14C, 13C, 15N) as tracers of sources and cycling of soluble and particulate organic matter in the Santa Monica Basin, California

Williams

Robertson

Soutar

et al. 1992

Progress in Oceanography

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“…The lithological characteristics of the samples may also bear on the relative size of their lipid input from autochthonous and allochthonous sources, since higher plant material may be concentrated in coarser-grained sediment fractions (Thompson and Eglinton, 1978).…”

Section: Sample Comparisonsmentioning

confidence: 99%

Preliminary Lipid Analyses of Two Quaternary Sediments from the Middle America Trench, Southern Mexico Transect, Deep Sea Drilling Project Leg 66

Brassell¹,

Eglinton²,

Maxwell³

1982

Initial Reports of the Deep Sea Drilling Project

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We investigated the solvent-extractable hydrocarbons, ketones, alcohols, and carboxylic acids of two Quaternary sediments from the Middle America Trench (Sections 487-2-3 and 491-1-5). These lipids are derived from a mixed input of autochthonous and allochthonous materials, with minor contributions from thermally mature sources. Their compositions are typical of those of immature Quaternary marine sediments, and their lipid distributions show many similarities to those of Japan Trench sediments. INTRODUCTIONThe solvent-extractable lipids of two Quaternary sediments (Sections 487-2-3 and 491-1-5) from the oceanic plate and central slope of the Middle America Trench were investigated by gas chromatography and computerized gas chromatography-mass spectrometry. The sections were chosen to permit the comparison of environments on either side of the trench. This preliminary report describes the lipid compositions of these two samples and interprets them in terms of their input sources, conditions of deposition, and extent of diagenesis. We also make a brief comparison of their lipid distributions with those of Quaternary sediments from the Japan Trench. Table 1 summarizes the lithological characteristics of the samples and includes their weights. Organic carbon determinations were not made for these samples, but the values of adjacent sections are given (site chapters, this volume).

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The fractionation of a Recent sediment for organic geochemical analysis

Cited by 112 publications

References 11 publications

Effect of Particle Size on Organic Content and Microbial Abundance Within Four Marine Sediments

Effect of Particle Size on Organic Content and Microbial Abundance Within Four Marine Sediments

Isotopic signatures (14C, 13C, 15N) as tracers of sources and cycling of soluble and particulate organic matter in the Santa Monica Basin, California

Preliminary Lipid Analyses of Two Quaternary Sediments from the Middle America Trench, Southern Mexico Transect, Deep Sea Drilling Project Leg 66

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