Partial resolution of sources of n-alkanes in the saline portion of the Parachute Creek Member, Green River Formation (Piceance Creek Basin, Colorado)

Collister, James W.; Lichtfouse, Éric; Hieshima, G.B.; Hayes, John M.

doi:10.1016/0146-6380(94)90010-8

Cited by 111 publications

(50 citation statements)

References 49 publications

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“…It can be noted that n-alkanes in the range C 25 to C 35 exhibiting an odd predominance and an isotopic composition in the range -30 to -27‰ have been shown to occur in extracts of various low maturity sediments (Rieley et al, 1991;Collister et al, 1992;Lichtfouse and Collister, 1992;Lichtfouse et al, 1994;Collister et al, 1994). Based on their isotope ratios and distributions, these n-alkanes should not be chiefly derived from terrestrial waxes but more likely from algal lipids.…”

Section: N-alkane Distributions and Isotopic Compositionsmentioning

confidence: 99%

Possible algal origin of long chain odd n-alkanes in immature sediments as revealed by distributions and carbon isotope ratios

Lichtfouse¹,

Derenne²,

Mariotti³

et al. 1994

Organic Geochemistry

121

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Section: N-alkane Distributions and Isotopic Compositionsmentioning

confidence: 99%

Possible algal origin of long chain odd n-alkanes in immature sediments as revealed by distributions and carbon isotope ratios

Lichtfouse¹,

Derenne²,

Mariotti³

et al. 1994

Organic Geochemistry

121

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“…For this analysis, a mixing model based on the formula used by Collister et al (1994b) The notation for the model is based on the conventions of Collister (1992) and Collister et al (1994b). It is also similar to the approach used by Lichtfouse and Eglinton (1996).…”

Section: I4mentioning

confidence: 99%

Biogeochemical applications of compound-specific radiocarbon analysis

Pearson¹

1999

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Compound-specific carbon isotopic (013C and !J.14C) data are reported for lipid biomarkers isolated from Santa Monica Basin (SMB) and Santa Barbara Basin (SBB) surface sediments. These organic compounds represent phytoplanktonic, zooplanktonic, bacterial, archaeal, terrestrial, and fossil carbon sources. The lipids include long-chain n-alkanes, fatty acids (as FAMEs), n-alcohols, C 30 mid-chain ketols and diols, sterols, hopanols, and ether-linked C4o-biphytanes of Archaea.The data show that the carbon source for most of the biomarkers is marine euphotic zone primary production or subsequent heterotrophic consumption of this biomass. Two lipid classes represent exceptions to this finding. !J.14C values for the n-alkanes are consistent with mixed fossil and contemporary terrestrial plant sources.The archaeal isoprenoid data reflect chemoautotrophic growth below the euphotic zone.The biomarker class most clearly representing marine phytoplanktonic production is the sterols. It is suggested, therefore, that the sterols could serve as paleoceanographic tracers for surface-water DIC.The isotopic data are used to construct two algebraic models. The first calculates the contributions of fossil and modem vascular plant carbon to 5MB n-alkanes. This model indicates that the !J.14C of the modern component is +235%0 (post-bomb) or 0%0 (pre-bomb). The second model uses these values to determine the origin of sedimentary TOe. The results are comparable to estimates based on other approaches and suggest that -60% of 5MB TOC is of marine origin, modern terrestrial and fossil sources contribute -10% each, and the remaining -20% is of unknown origin.iii For all of our mothers.iv ACKNOWLEDGEMENTS

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“…18 CAM (crassulacean acid metabolism) plants use both C3 and C4 carbon fixation pathways, so the δ 13 C range are intermediate (-23 and -29‰). 10 Isotopic fractionation in photosynthetic marine organisms is more complex, being controlled by the concentration of dissolved CO 2 , nutrients availability, pH and physiological factors such as cell size, growth rate, and membrane permeability. 19,20 The δ 13 C values of aquatic plants are usually less negative than that of terrestrial plants.…”

Section: Introductionmentioning

confidence: 99%

“…6 During the last decades, the carbon isotopic analysis of some biomarkers have been widely used as a valuable tool to better distinguish the sources of organic matter in marine environments. 5,[7][8][9][10][11][12][13][14] The carbon isotope composition in the biosynthesized organic material depends on both the isotopic composition of the carbon source used by organisms and the isotope discrimination that occurs during carbon fixation, which includes the steps of absorption and intracellular diffusion, and also the biosynthesis of the cell components. 15 Thus, when two classes of organisms present an overlap in the n-alkane distribution, additional information can be obtained from the specific compound isotopic composition.…”

mentioning

confidence: 99%

“…15 Thus, when two classes of organisms present an overlap in the n-alkane distribution, additional information can be obtained from the specific compound isotopic composition. 10 The development of gas chromatography coupled to isotope ratio mass spectrometer via a combustion interface (GC-C-IRMS) has made possible the establishment of the compoundspecific δ 13 C of n-alkanes, which leads to a significant improvement regarding the characterization of these compounds sources. 6,16 Differences between the δ 13 C values of plant tissue are related to the isotopic fractionation during photosynthesis.…”

mentioning

confidence: 99%

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Compound-Specific δ13C of n-Alkanes: Clean-Up Methods Appraisal and Application to Recent Sediments of a Highly Contaminated Bay

Ceccopieri

Scofield

Almeida

et al. 2018

J. Braz. Chem. Soc.

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Different clean-up methods to determine isotopic composition of n-alkanes were tested. Sources of organic matter in Guanabara Bay were re-examined through the δ 13 C of individual n-alkanes in surface sediment samples. The n-alkanes were efficiently isolated without significant losses of the compounds of interest. The δ 13 C of n-alkanes (n-C 17 to n-C 35 ) ranged between -34.0 and -26.4‰. More depleted δ 13 C values associated to higher carbon preference index (CPI > 4) suggest prevalence of biogenic n-alkanes from terrestrial origin in the inner stations influenced by inputs from mangrove areas. Small isotopic differences between odd and even-numbered chains and 13 C-enrichment in long-chain homologues indicate a petrogenic hydrocarbons contribution. Higher concentrations of short-chain compounds associated to a more 13 C-enriched total organic carbon (TOC) were found near the most intense sewage discharges. Results show that δ 13 C of n-alkanes can be applied to a highly degraded system as the Guanabara Bay and help improve the characterization of the organic matter. Keywords: GC-C-IRMS, UCM, urea adduction, organic matter, Guanabara Bay IntroductionThe composition and distribution of hydrocarbons in sediment samples provide information about the organic matter sources and transformation processes occurring in the environment. 1 Studies on n-alkanes have often been conducted to assess the origin of hydrocarbons, such as biogenic (marine or terrestrial) or petrogenic, found in the marine environment. The assessment makes use of the difference in the n-alkane chain length to draw conclusions on the sources of organic matter. In higher plants, for example, n-alkanes from epicuticular waxes show long chains and an odd over even-numbered carbon chain predominance. 2 Algae are characterized by shorter chain lengths with no expressive odd-over-even preference. 3 In contrast, n-alkanes in fossil fuels have a wide composition range, without predominance of odd or even-numbered chains. 4 However, despite these typical fingerprints, there are cases in which n-alkane profile of different classes of organisms overlap, resulting in ambiguous interpretations of the organic material sources. 5 Given this multiplicity of origins, an interpretation of the different sources exclusively by the concentrations of n-alkanes is very limited in more complex environments. 6 During the last decades, the carbon isotopic analysis of some biomarkers have been widely used as a valuable tool to better distinguish the sources of organic matter in marine environments. 5,[7][8][9][10][11][12][13][14] The carbon isotope composition in the biosynthesized organic material depends on both the isotopic composition of the carbon source used by organisms and the isotope discrimination that occurs during carbon fixation, which includes the steps of absorption and intracellular diffusion, and also the biosynthesis of the cell components. 15 Thus, when two classes of organisms present an overlap in the n-alkane distribution, additional information can b...

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Partial resolution of sources of n-alkanes in the saline portion of the Parachute Creek Member, Green River Formation (Piceance Creek Basin, Colorado)

Cited by 111 publications

References 49 publications

Possible algal origin of long chain odd n-alkanes in immature sediments as revealed by distributions and carbon isotope ratios

Possible algal origin of long chain odd n-alkanes in immature sediments as revealed by distributions and carbon isotope ratios

Biogeochemical applications of compound-specific radiocarbon analysis

Compound-Specific δ13C of n-Alkanes: Clean-Up Methods Appraisal and Application to Recent Sediments of a Highly Contaminated Bay

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