An n-alkane proxy for the sedimentary input of submerged/floating freshwater aquatic macrophytes

Ficken, Katherine J.; Li, B; Swain, D. L.; Eglinton, G.

doi:10.1016/s0146-6380(00)00081-4

Cited by 1,423 publications

(1,002 citation statements)

References 9 publications

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“…Dried samples were extracted with dichloromethane (DCM) using ASE (Accelerated Solvent Extraction) at 75˚C and 50 bar for 20 min to obtain the complete free lipid fraction including polar compounds. This approach is comparable to methods applied to modern sediments by Hinrichs et al (2000), Lutz et al (2000), Budge andParrish (1998), andFicken et al (2000). Excess solvent was removed by evaporation under reduced pressure and the organic extract was again taken up in small amounts of DCM.…”

Section: Sampling and Analysismentioning

confidence: 92%

“…The partial predominance of Typha, and Potamogeton can be responsible only for the enhanced abundance of C20 and C22 fatty acids (Fig. 3b) (Cranwell 1984, Ficken et al 2000 but probably not for the significant occurrence of C36 compounds. In addition, long-chain n-alkanes mainly with a strong odd over even predominance in n-C25 to n-C35 range and some sterols are present.…”

Section: Molecular Composition Of Lipids From the Landward Sitesmentioning

confidence: 99%

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Organic matter composition in the sediment of three Brazilian coastal lagoons: district of Macaé, Rio de Janeiro (Brazil)

Zink

Furtado

Casper

et al. 2004

An. Acad. Bras. Ciênc.

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Freshwater lagoons comprise important coastal ecosystems and natural buffers between urbanized land areas and open ocean in the Rio de Janeiro State, Brazil. Studies of sediment and water chemistry, zooplankton and bacterial communities to assess the extent of anthropogenic disturbance are available. Here we contribute with an organic-geochemical approach supplemented by some microbiological aspects to complete the characterization of these lagoonal ecosystems. Bulk organic matter and extractable lipids (aliphatic hydrocarbons, alcohols and fatty acids, sterols) were investigated from two locations per lagoon: at the seaward site and landward ends -and at two depth intervals (0-3 and 3-6 cm) per site. Urbanized Imboacica Lagoon received increased anthropogenic input over the most recent years represented by the topmost 3 cm of sediment, whereas deeper sediment layers are less affected by human influence. Eutrophication or nutrient availability favored enhanced algal/cyanobacterial growth. In remote Cabiúnas and Comprida Lagoons pristine conditions are preserved. Organic matter from vascular plants dominates (chain length of free lipids up to C36), which is exceptionally well preserved by acidic lagoonal waters. Differentiation between landward and seaward sites in these two lagoons is less well established due to much smaller surface/volume to catchment ratios. No anthropogenic influences are yet detectable in sediments of Cabiúnas and Comprida Lagoons.

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Section: Sampling and Analysismentioning

confidence: 92%

Section: Molecular Composition Of Lipids From the Landward Sitesmentioning

confidence: 99%

Organic matter composition in the sediment of three Brazilian coastal lagoons: district of Macaé, Rio de Janeiro (Brazil)

Zink

Furtado

Casper

et al. 2004

An. Acad. Bras. Ciênc.

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“…Ordovician and Silurian samples in the HCM contain biomarkers that suggest a marine source for the organic matter owing to (i) the dominance of low molecular weight n-alkanes (<n-C 23 ) (Spiro et al, 1983), (ii) the unimodal distribution of n-alkanes in almost all of the samples (excepting samples OR6 and SB1) (Ficken et al, 2000;Gelpi et al, 1970;Tissot and Welte, 1984), (iii) high n-C 17 /n-C 23 ratio (apart from OR6 and SB5) (Peters et al, 2005;Riboulleau et al, 2007), and (iv) a high relative abundance of C 23 and low relative contents of C 19 and C 20 tricyclic terpanes in all samples (Ahmed et al, 2014;Peters et al, 2005;Zumberge, 1984). The organic matter in OR6 and SB5 also has marine characteristics but with slight differences compared to other samples.…”

Section: Origin Of Organic Mattermentioning

confidence: 99%

Organic geochemical characteristics of black shales across the Ordovician–Silurian boundary in the Holy Cross Mountains, central Poland

Mustafa

Sephton

Watson

et al. 2015

Marine and Petroleum Geology

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Black shales in the Holy Cross Mountains area of Poland provide a record of environmental change across the Ordovician-Silurian boundary. The changing depositional conditions have generated a variation in organic matter contents above and below the boundary. Investigating the organic constitution of these black shales has the potential to reveal how their organic matter contents were generated and how suitable these rocks and their lateral equivalents may be for exploitation as shale and Silurian rocks, these rocks were buried and subjected to thermal maturation. Rock Eval and Mustafa, K.A., Sephton M.A., Spathopoulos, F., Watson, J.S., Krzywiec, P. Organic geochemical characteristics of black shales across the Ordovician-Silurian boundary in the Holy Cross Mountains, Central Poland, Marine and Petroleum Geology, doi:10.1016/j.marpetgeo.2015.08.018. 2 biomarker thermal maturity parameters all indicate that the organic matter is mature and lies within the oil window. The Ordovician and Silurian shales have direct relevance to recent attempts to discover and exploit shale gas reservoirs in Poland. Our data and interpretations suggest that the relatively low TOC values (<2%) and low maturities for gas generation render these rocks unsuitable for commercial shale gas production. The progressive improvement in conditions for preserving organic matter across the Ordovician-Silurian boundary does, however, leave the possibility that more suitable deposits occur in Early Silurian rocks in other parts of the basin.

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“…Nevertheless, this proxy is able to trace lake carbon cycling and/or lake productivity on various ecological to geological timescales and will add to the limited methods available to address key questions relevant to the global carbon cycle. 14 [37] G. Rau, Science 1978, 201, 901. …”

Section: Resultsmentioning

confidence: 99%

“…Productivity changes also influence fractionation, since algae preferentially use the lighter isotope as it is energetically more efficient. Increased productivity leads to higher δ 13 C bulk values [13] provided carbon supply does not change, for example, the bulk value may be strongly influenced by organic detritus produced by floating and submerged aquatic macrophytes, which may be very abundant in shallow lakes [14] . For these reasons, the use of δ 13 C bulk is a useful but a blunt tool for the reconstruction of lake carbon cycles and new methods are needed.…”

Section: Introductionmentioning

confidence: 99%

Developing a methodology for carbon isotope analysis of lacustrine diatoms

Hurrell

Barker

Leng

et al. 2011

Rapid Comm Mass Spectrometry

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Stable isotope analysis of sedimentary carbon in lakes can help reveal changes in terrestrial and aquatic carbon cycles. A method based on a single, photosynthetic organism, where host effects are minimised, should offer more precision than carbon isotope studies of bulk lake sediments. Here we systematically develop a method for use on fossil lacustrine diatom frustules, adapted from previous studies in marine environments. A step-wise cleaning experiment on diatomaceous lake sediments from Lake Challa, Mt, Kilimanjaro, was made to demonstrate the necessary treatment stages to remove external sedimentary carbon. Changes in soluble carbon compounds during these cleaning experiments were measured using GC/MS. Mass spectrometry methods were refined to measure the small percentage carbon of these samples and details of these methods are presented.Samples of cleaned diatoms containing <1% carbon yielded robust results. Carbon isotope analysis of diatom samples containing different species mixtures were performed and showed suggestive differences, although the effects lay within current experimental error and require further work.Unlike work on oxygen and silicon isotopes from diatom frustules, mineral contamination had no discernable impact on the diatom carbon isotope ratios from these sediments. The range of values found in the lakes investigated thus far can be interpreted with reference to the supply and nature of carbon from the catchment as well as demand generated from lake primary productivity.3

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An n-alkane proxy for the sedimentary input of submerged/floating freshwater aquatic macrophytes

Cited by 1,423 publications

References 9 publications

Organic matter composition in the sediment of three Brazilian coastal lagoons: district of Macaé, Rio de Janeiro (Brazil)

Organic matter composition in the sediment of three Brazilian coastal lagoons: district of Macaé, Rio de Janeiro (Brazil)

Organic geochemical characteristics of black shales across the Ordovician–Silurian boundary in the Holy Cross Mountains, central Poland

Developing a methodology for carbon isotope analysis of lacustrine diatoms

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