Molecular Stratigraphic Study of Sediments from Holes 658A and 660A, Leg 108

Poynter, J. G.; Farrimond, Paul; Brassell, Simon C.; Eglinton, G.

doi:10.2973/odp.proc.sr.108.161.1989

Cited by 21 publications

(21 citation statements)

References 25 publications

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“…More details of the techniques employed can be found elsewhere (e.g. Poynter et al 1989;ten Haven et al 1990a). Quantitative analysis of individual compounds was performed relative to known amounts of added internal standards.…”

Section: Methodsmentioning

confidence: 99%

“…Due to rapid instrumental advancements in the seventies, especially in the field of gas chromatographymass spectrometry, and an increased knowledge of the natural product precursor/geochemical marker product relationships on the molecular level during the last two decades the analyses of more polar fractions are now routinely carried out. In our ODP studies (ten Haven et al 1989;ten Haven & RullkOtter 1991;ten Haven & Kroon 1991;Poynter et al 1989;Farrimond et al 1990a, b) we analysed the total solvent extracts of sediments directly by GC and GC-MS after converting acid and alcohol functionalities into methyl esters and trimethylsilyl ethers, respectively. For more detailed compound identifications some extracts were chromatographically separated, and the subfractions thus obtained analysed by GC and GC-MS (after appropriate derivatization).…”

Section: Extractable Lipidsmentioning

confidence: 99%

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Variations in the content and composition of organic matter in sediments underlying active upwelling regimes: a study from ODP Legs 108, 112, and 117

Haven

Eglinton

Farrimond

et al. 1992

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An overview is presented of organic geochemical studies on sediments underlying the active upwelling cells off Northwest Africa (ODP Leg 108; Site 658), off Peru (Leg 112; Sites 679, 681, 684, 686) and off Oman (Leg 117; Sites 723, 725, 728). The investigated sediments are all characterized by high organic carbon contents (0.5-9% Corg), being the sedimentary expression of an increased primary bioproductivity induced by upwelling currents of deep nutrient-rich waters. The organic matter is predominantly of marine origin with variable admixtures of a terrigenous component; the highest relative contribution is found at Site 658. The extractable lipids are composed of a wide variety of compounds, of which the most characteristic and abundant compounds were quantified. Long-chain unsaturated ketones usually dominate. Steroids, alkanediols and their corresponding keto-ols are also present in high concentrations, although strong variations in their abundances were noted. In addition, organic sulphur compounds are omnipresent and reveal strong variations in their distribution, but do not make a major contribution to the total amount of extractable lipids.

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Section: Methodsmentioning

confidence: 99%

Section: Extractable Lipidsmentioning

confidence: 99%

Variations in the content and composition of organic matter in sediments underlying active upwelling regimes: a study from ODP Legs 108, 112, and 117

Haven

Eglinton

Farrimond

et al. 1992

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“…The temperature information is apparently preserved in the face of degradation, which is not true for micropaleontological methods of temperature reconstruction (see Thompson, 1981). A number of studies have now characterized glacial-interglacial temperature changes by the alkenone method (Brassell et al, 1986;Eglinton et al, 1992;Jasper and Gagosian, 1989;Lyle et al, 1992;Poynter et al, 1989;Schneider et al, 1995). Only two reports have been published that extend alkenone paleotemperature estimates in the Pacific Ocean to the last interglacial; these both come from sediments collected near the equator (Farrimond et al, 1990;Lyle etal., 1992).…”

Section: Introductionmentioning

confidence: 99%

Glacial-Interglacial Sea-Surface Temperature Record Inferred from Alkenone Unsaturation indices, Site 893, Santa Barbara Basin

Herbert¹,

Yasuda²,

Burnett³

1995

Proceedings of the Ocean Drilling Program

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Samples from Ocean Drilling Program Hole 893A were analyzed for paleotemperatures by determining the "U k , 7 " unsaturation index at about 3 k.y. resolution over the past 162 ka. Values of the unsaturation index at Hole 893A range from 0.415 to 0.696, corresponding to a total range in estimated paleotemperature of 8°C. Most of the variance is paced by the 41 k.y. obliquity cycle, although 100 k.y. eccentricity and 21 k.y. precessional components are present as well. The pattern of alkenone unsaturation indices over time is quite different from that produced by planktonic foraminiferal paleoclimatic proxies. We conclude that the alkenone record approximates the history of sea-surface temperature in the Santa Barbara Basin over the time period studied. Alkenone data suggest that Santa Barbara Basin sea-surface temperatures exceeded present values by about 4°d uring oxygen isotope Stage 5e. The Younger Dryas event may be represented as a 3° cooling that spanned several k.y. The predominance of the obliquity cycle in inferred glacial-interglacial changes in sea-surface temperature most likely reflects a real divergence of North Pacific sea-surface temperature from the classical picture of glacial-interglacial change based on oxygen isotope analyses. Alkenone abundances in the sediment vary by nearly two orders of magnitude. High abundances coincide with laminated facies, suggesting that oxygen content of basinal waters plays an important role in the preservation of these compounds.

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“…For example, the abundance and within class distributions of longchain, saturated (>C20)n-alkanes, n-alkanols, and n-alkanoic acids record terrigenous inputs to marine sediments [Prahl et al, 1988;Poynter et al, 1989a;McCaffrey et al, 1990;Santos et al, 1994;Madureira et al, 1995]. These long-chain compounds are major components of higher plant leaf waxes which are stored in large quantities in soils, lake and coastal sediments, and hence can be considered as terrigenous lipid story, and the most complete picture can only be built using a wide range of proxies from the same samples and cores.…”

Section: Introductionmentioning

confidence: 99%

Late Quaternary high‐resolution biomarker and other sedimentary climate proxies in a Northeast Atlantic Core

Madureira¹,

Kreveld²,

Eglinton³

et al. 1997

Paleoceanography

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Abstract. We studied variations in terrigenous input and sea surface temperature over the last 208 ka using a multiproxy approach, involving direct comparison of terrigenous and marine molecular biomarker, foraminiferal abundance, and other sedimentological data for the same horizons in a single northeast Atlantic core (core T88-9P; 48o23 ' N, 25o05 ' W, 3193 m water depth, 790 cm core length) with a well-resolved •5180 stratigraphy. The abundances of three landderived, long-chain compound classes, the n-alkanes (C27, C29, and C 3 l), the n-alkanoic acids (C24, C26, and C28), and the n-alkanols (C24, C26, and C28) show glacial/interglacial related changes in the past 208 ka which generally parallel the weight percent noncarbonate. The abundances of these three compound classes are higher in glacial than in interglacial sediments. Such changes are consistent with the expected higher dust inputs during glaciations as well as enhanced advection of particulate matter in current systems. Ice-rafted debris (Heinrich events) may also contribute to the terrigenous biomarker record. The sea surface temperature (SST) signals derived from the alkenone unsaturation index (uK'37) give an average SST during interglacial periods of 13øC, which is about 3-4øC higher than the average glacial SST estimate. The uK'37 -derived SST values dropped markedly in some Heinrich layers, while sometimes leading the onset of the layer; the percent Neogloboquadrina pachyderma(s), which is another frequently used qualitative temperature proxy, generally shows maxima coinciding with the layers. Our results show that most Heinrich layers were produced during times of intensely cold waters in the eastern North Atlantic. They demonstrate that sufficient alkenones are present in the sediments for alkenone stratigraphy to be used as a tool for the assessment of short-term variations in sea surface temperatures even in these oligotrophic North Atlantic waters.

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Molecular Stratigraphic Study of Sediments from Holes 658A and 660A, Leg 108

Cited by 21 publications

References 25 publications

Variations in the content and composition of organic matter in sediments underlying active upwelling regimes: a study from ODP Legs 108, 112, and 117

Variations in the content and composition of organic matter in sediments underlying active upwelling regimes: a study from ODP Legs 108, 112, and 117

Glacial-Interglacial Sea-Surface Temperature Record Inferred from Alkenone Unsaturation indices, Site 893, Santa Barbara Basin

Late Quaternary high‐resolution biomarker and other sedimentary climate proxies in a Northeast Atlantic Core

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