Terrestrial and marine n-alcohol inputs and degradation processes relating to a sudden turbidity current in the Zaire canyon

Treignier, C.; Derenne, Sylvie; Saliot, A.

doi:10.1016/j.orggeochem.2006.03.010

Cited by 56 publications

(63 citation statements)

References 33 publications

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“…Another explanation could have been predator-prey interactions regulating the meiobenthic stock sizes (Soltwedel, 1997) biomarkers of pelagic and terrestrial origin of particles were measured at control site C (Treignier et al, 2006). This station revealed the highest short/long ratio (6.4) of n-alcohols, which is indicative of a major marine plankton input (Treignier et al, 2006;Treignier et al, this volume). However, the value suggests that control site C is likely to receive terrestrial material.…”

Section: Deep-sea Control Sites In the Gulf Of Guineamentioning

confidence: 96%

“…The finest particles of the upper part of the turbidity currents are even able to overflow the canyon flanks, but these phenomena might not occur at each turbidity event. The organic matter of the turbiditic overflow has a strong terrigenous signal, and its influence is visible in the total organic carbon content as well as in the n-alcohol composition (Treignier et al, 2006). Andersen et al, 2004).…”

Section: Study Areamentioning

confidence: 99%

“…It was hypothesised that the identified discrepancies between lower meiofaunal standing stocks and high pigment values may indicate a dislocation of (phyto-) detritus possibly caused by a coastal branch of the Benguela Current and the Congo River outflow (Soltwedel, 1997). Another explanation could have been predator-prey interactions regulating the meiobenthic stock sizes (Soltwedel, 1997) biomarkers of pelagic and terrestrial origin of particles were measured at control site C (Treignier et al, 2006). This station revealed the highest short/long ratio (6.4) of n-alcohols, which is indicative of a major marine plankton input (Treignier et al, 2006;Treignier et al, this volume).…”

Section: Deep-sea Control Sites In the Gulf Of Guineamentioning

confidence: 99%

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Deep-sea habitat heterogeneity influence on meiofaunal communities in the Gulf of Guinea

Gaever

Galéron

Sibuet

et al. 2009

Deep Sea Research Part II: Topical Studies in Oceanography

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To estimate the degree of spatial heterogeneity of benthic deep-sea communities, we carried out a multiple-scale (from m's to 200 km) investigation in the Congo-Angola margins (Equatorial West African margin, 3150-4800 m) in which we examined the metazoan meiofauna at a variety of habitats along the Congo Channel system and in the associated cold seep. We investigate the structure, density, vertical distribution patterns in the sediment and biomass of meiofaunal communities in the Gulf of Guinea and how they are controlled by hydrologic and biogeochemical processes. The meiofaunal communities in the Gulf of Guinea were shaped by heterogeneous conditions on the margin, and reflect the multiple-scale spatial variability that corresponds with different identified habitats. The two control sites, located at >100 km away from the canyon, were inhabited by very dense and the most diverse meiobenthic communities. Similar meiobenthic communities inhabited the transition zone between the canyon and the cold seep. Sites located along the Congo Channel were obviously affected by the local high-velocity bottom currents and unstable sedimentary conditions in this active submarine system. Extremely low meiobenthic densities and very low proportions in the most surficial sediment layers provided evidence for recently highly disturbed sediments at these sites. The ROV Victor 6000 provided images of the cold seep, showing a patchy distribution of several types of patchy distributed megafaunal communities dominated by three key symbiotic taxa (Mytilidae, Vesicomyidae and Siboglinidae). These cold seep sediments were colonised by a unique meiobenthic community, characterised by a high small-scale (m's) patchiness, low species richness and the prominent dominance of two large-sized nematode species: Sabatieria mortenseni, which is a cosmopolitan nematode known from littoral habitats, and an undescribed Desmodora species. The high individual body weight of Sabatieria mortenseni and its dominance at the cold seep site resulted in a significantly higher nematode biomass at the seep compared to the surrounding sites. In addition, the vertical A c c e p t e d m a n u s c r i p t 2 nematode profiles, with maximum proportions in subsurficial layers, points to a chemosynthesis-based meiobenthic community in this cold seep, in contrast to the phytodetritus-based communities at the control sites and at the transition zone.

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Section: Deep-sea Control Sites In the Gulf Of Guineamentioning

confidence: 96%

Section: Study Areamentioning

confidence: 99%

Section: Deep-sea Control Sites In the Gulf Of Guineamentioning

confidence: 99%

See 1 more Smart Citation

Deep-sea habitat heterogeneity influence on meiofaunal communities in the Gulf of Guinea

Gaever

Galéron

Sibuet

et al. 2009

Deep Sea Research Part II: Topical Studies in Oceanography

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“…The initial goal of the study performed by Treignier et al [14] was to study the sedimentary systems on the West African continental margin and the benthic ecosystem of the Zaire canyon in relation to organic matter inputs, as the quantity and quality might influence its development. Two criteria were used: the relative abundance of short (<C 20 ) and long-chain (>C 22 ) n-alkohols derived from marine organisms and higher plants, respectively, and the ratio of odd to evencarbon numbered <C 20 n-alkohols to assess the extent of alteration.…”

Section: Evidencing Terrigenous Organic Matter Inputs Associated Withmentioning

confidence: 99%

Sources markers in aerosols, oceanic particles and sediments

Saliot

2009

Eur. Phys. J. Conferences

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Abstract. This review presents some diagnostic criteria used for identifying and quantifying terrestrial organic matter inputs to the ocean. Coupled to the isotopic composition of total organic carbon, the analysis of stable biomarkers permits to trace higher plant contributions in aerosols, dusts, sedimenting particles and dissolved phase in the water column and ultimately in recent and ancient sediments and soils. Some applications are presented, based on the analysis of n-alkyl compounds by a combination of gas chromatography and mass spectrometry (n-alkanes, n-alkanols, n-alkanoic acids and wax esters). Another approach has been developed using the analysis of macromolecular compounds present in higher plants. Abundances of the phenolic compounds from lignin, benzene carboxylic acids obtained during cupric oxide oxidation, Curie pyrolysis are used to characterise terrestrial organic matter sources and inputs. Finally due to the importance of biomass burning in continent-ocean transfers, biomarkers are presented in the polycyclic aromatic hydrocarbon class and for monosaccharide derivatives from the breakdown of cellulose.

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“…have been reported (e.g., Hedges and Keil, 1995;Thomsen et al, 2001;Laurier et al, 2003;Treignier et al, 2006), there have been only a few geochemical studies of older turbiditic sedimentary sequences for reconstruction of long time-scale paleoenvironments and material-cycling systems. Hoefs et al (2002) reported the organic geochemical investigations of Miocene to Pleistocene turbiditic sequences collected by Ocean Drilling Program (ODP) Leg 157 on the Madeira Abyssal Plain (MAP) off northern Africa, which showed variations in biomarker compositions that were attributed to redox conditions (oxygen exposure time) of the depositional environment.…”

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confidence: 99%

Heterogeneities of hydrocarbon compositions in mudstones of a turbiditic sequence of the Miocene Kawabata Formation in Yubari, central Hokkaido, Japan

Okano

Sawada

2008

Geochem. J.

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Biomarker analyses of aliphatic and aromatic hydrocarbons were conducted on the upper and lower parts of individual mudstones in a turbiditic sequence of the Miocene Kawabata Formation, Yubari, central Hokkaido, Japan. The relative abundances of terrigenous biomarkers such as long-chain n-alkanes, C 29 steranes and oleanenes as well as biomarkers produced in coastal areas such as dinosteranes tend to be higher in the lower parts of mudstones than those of the upper ones in the turbiditic sequence. Also, pristane/phytane ratios, which are proxies for depositional environment, significantly vary between the upper and lower parts of mudstones in the turbiditic sequence. These results suggest that these variations reflect the types and phases of transport and redeposition by turbidity systems rather than postdepositional diagenesis. Such heterogeneous distributions in most of biomarker compositions within the mudstone layers may lead to a severe bias for reconstructing paleoenvironment and paleoecology. Nevertheless, the higher plant parameters (HPPs) such as the retene/cadalene ratios are consistently homogenous within the mudstones. Moreover, paleovegetation reconstructed from HPPs are concordant with a previous paleobotanical study. Thus, it seems that these biomarker records in the turbidite sediments are reliable and strongly applicable for reconstructing terrestrial paleovegetation.

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Terrestrial and marine n-alcohol inputs and degradation processes relating to a sudden turbidity current in the Zaire canyon

Cited by 56 publications

References 33 publications

Deep-sea habitat heterogeneity influence on meiofaunal communities in the Gulf of Guinea

Deep-sea habitat heterogeneity influence on meiofaunal communities in the Gulf of Guinea

Sources markers in aerosols, oceanic particles and sediments

Heterogeneities of hydrocarbon compositions in mudstones of a turbiditic sequence of the Miocene Kawabata Formation in Yubari, central Hokkaido, Japan

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