The origin and fate of lipids in the Japan Trench

Brassell, Simon C.; Comet, Paul A.; Eglinton, G.; Isaacson, P.; McEvoy, J.; Maxwell, James R.; Thomson, I.D.; Tibbetts, P. J. C.; Volkman, John K.

doi:10.1016/0079-1946(79)90120-4

Cited by 46 publications

(27 citation statements)

References 37 publications

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“…However, femenes have also been identified in microorganisms (HOWARD et al, 1984) and have been found in sedimentary environments devoid ofhigher plant inputs . In some cases, their occurrence has been attributed to microbial sources (BRASSELL et al, 1980). 17/3(H),21/3(H)-bishomohopanol (XXIIb) and the other Other oxo-, hydroxy-, and methoxy-triterpenoid compohopanoid alcohols (Table 6) may also originate from pronents have also been found but not yet fully identified.…”

Section: Hopanoids and Gammaceroidsmentioning

confidence: 99%

Sedimentary lipid biogeochemistry of an hypereutrophic alkaline lagoon

Grimalt

Yruela

Sáiz‐Jiménez

et al. 1991

Geochimica et Cosmochimica Acta

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Section: Hopanoids and Gammaceroidsmentioning

confidence: 99%

Sedimentary lipid biogeochemistry of an hypereutrophic alkaline lagoon

Grimalt

Yruela

Sáiz‐Jiménez

et al. 1991

Geochimica et Cosmochimica Acta

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“…Also, an additional input of chlorophyll during sapropel formation as a result of an increased primary productivity increases the phytol concentration in the sapropels, but a quantitative estimate of this additional input cannot be made. Phytol reflects an autochthonous rather than an allochthonous input, because it is not expected to survive intact during transporta-159 tion from the continent to the deep sea (Brassell et al, 1980).…”

Section: Table IIImentioning

confidence: 99%

Late Quaternary Mediterranean sapropels II. Organic geochemistry and palynology of S1 sapropels and associated sediments

Haven¹,

Baas²,

Leeuw³

et al. 1987

Chemical Geology

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Ten Haven, H.L., Baas, M., De Leeuw, J.W., Schenck, P.A. and Brinkhuis, H., 1987. Late Quaternary Mediterranean sapropels, II. Organic geochemistry and palynology of $1 sapropels and associated sediments. Chem. Geol., 64: 149-167.Six S~ sapropel samples from the eastern Mediterranean were investigated organic geochemically to study the lateral variation within this organic-rich layer. Five of these samples were also analyzed palynologically. In addition, some sediment samples from below and overlying the sapropel intervals were investigated for their organic geochemical characteristics.Organic matter of S ~ sapropels is of a mixed marine, terrigenous and bacterial origin. A trend of relatively increasing amounts of continentally derived organic matter towards more seaward and deeper realms can be observed from both palynological and organic geochemical data. This trend is supported to some extent by 5 l:~C-values of the organic matter.The sapropelic intervals deposited on the Nile Cone are characterized by expanded thicknesses and a "diluted" organic carbon content due to a higher sedimentation rate. The environmental conditions ( in terms of preservation ) during sapropel formation over the eastern Mediterranean were probably not uniform. At site 29 the conditions were favourable for the deposition of sapropel with a higher organic carbon content than at the other locations. This might have been caused by better preservation conditions. An increasing discharge from the river Nile seems to be the driving force for formation of the S~ sapropels. Based on this assumption a model for sapropel formation is proposed. Although not all the data could be explained properly by this model, most phenomena can be explained.

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“…The 17ß(H),21j8(H)-hopanes dominate and indicate that the sediments have been exposed only to low thermal stress. The predominance of neohop-13(18)-enes over hop-17(21)-enes probably reflects the oxic depositional environment because the former compounds appear to be the more stable isomers toward oxidation (see Brassell et al, 1980). The occurrence of small amounts of C 29 sterols, likely to be of terrigenous origin, in Sample 122-760B-8R-CC, 16-21 cm ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Petrography and Geochemistry of Organic Matter in Triassic and Cretaceous Deep-Sea Sediments from the Wombat and Exmouth Plateaus and nearby Abyssal Plains off Northwest Australia

Rullkötter¹,

Littke²,

Radke³

et al. 1992

Proceedings of the Ocean Drilling Program

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Triassic (Carnian-Rhaetian) continental margin sediments from the Wombat Plateau off northwest Australia (Sites 759, 760, 761, and 764) contain mainly detrital organic matter of terrestrial higher plant origin. Although deposited in a nearshore deltaic environment, little liptinitic material was preserved. The dominant vitrinites and inertinites are hydrogen-lean, and the small quantities of extractable bitumen contain w-alkanes and bacterial hopanoid hydrocarbons as the most dominant single gas-chromatography-amenable compounds.Lower Cretaceous sediments on the central Exmouth Plateau (Sites 762 and 763) farther south in general have an organic matter composition similar to that in the Wombat Plateau sediments with the exception of a smaller particle size of vitrinites and inertinites, indicating more distal transport and probably deposition in deeper water. Nevertheless, organic matter preservation is slightly better than in the Triassic sediments. Long-chain fatty acids, as well as aliphatic ketones and alcohols, are common constituents in the Lower Cretaceous sediments in addition to n-alkanes and hopanoid hydrocarbons.Thin, black shale layers at the Cenomanian/Turonian boundary, although present at several sites (Sites 762 and 763 on the Exmouth Plateau, Site 765 in the Argo Abyssal Plain, and Site 766 on the continental margin of the Gascoyne Abyssal Plain), are particularly enriched in organic matter only at Site 763 (up to 26%). These organic-matter-rich layers contain mainly bituminite of probable fecal-pellet origin. Considering the high organic carbon content, the moderate hydrogen indices of 350-450 milligrams of hydrocarbon-type material per gram of C org , the maceral composition, and the low sedimentation rates in the middle Cretaceous, we suggest that these black shales were accumulated in an area of oxygen-depleted bottom-water mass (oceanwide reduced circulation?) underlying an oxygen-rich water column (in which most of the primary biomass other than fecal pellets is destroyed) and a zone of relatively high bioproductivity. Differences in organic matter accumulation at the Cenomanian/ Turonian boundary at different sites off northwest Australia are ascribed to regional variations in primary bioproductivity.

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The origin and fate of lipids in the Japan Trench

Cited by 46 publications

References 37 publications

Sedimentary lipid biogeochemistry of an hypereutrophic alkaline lagoon

Sedimentary lipid biogeochemistry of an hypereutrophic alkaline lagoon

Late Quaternary Mediterranean sapropels II. Organic geochemistry and palynology of S1 sapropels and associated sediments

Petrography and Geochemistry of Organic Matter in Triassic and Cretaceous Deep-Sea Sediments from the Wombat and Exmouth Plateaus and nearby Abyssal Plains off Northwest Australia

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