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  • 1995-1999  (10)
Document type
Keywords
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Year
  • 1
    Book
    Book
    Geochemistry of sulphur-rich organic matter in carbohydrate/evaporite depositional environments : a research project performed by the European Network of Organic Geochemical Laboratories (ENOG) ; [research developed within the ENOG-III Project] (1998)
    Oxford : Pergamon
    Details Availability
    Keywords: Forschungsbericht
    Type of Medium: Book
    Pages: V S., S. 1837 - 1960
    Series Statement: Organic geochemistry 29.1998,8
    Language: English
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular structure of the resistant biopolymer in zygospore cell walls of Chlamydomonas monoica (1999)
    Springer
    Planta 207 (1999), S. 539-543 
    Details
    ISSN: 1432-2048
    Keywords: Key words: Algaenan ; Chlamydomonas ; Sporopollenin ; Zygospore
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. The unicellular green alga Chlamydomonas monoica Strehlow is known to produce zygospores with a cell wall that is resistant against microbial and chemical attack. This resistance is thought to be due to the presence of a sporopollenin-like material. However, the resistant nature of sporopollenin-like materials seriously hampers their structural analysis. With complementary techniques such as 13C-nuclear magnetic resonance spectroscopy, Curie-point pyrolysis-gas chromatography/mass spectroscopy and RuO4 chemical degradation, the chemical composition of resistant biopolymer in the isolated cell walls of C. monoica zygospores was determined. This material is composed of C22–C30 linear alcohols and carboxylic acids, intermolecularly linked via ester and ether-linkages similar to the resistant aliphatic biopolymers encountered in the walls of the vegetative cells of the algae Tetraedron minimum, Scenedesmus communis and Pediastrum boryanum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004250050515
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    Paper (German National Licenses)
    Fulltext
  • 3
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    Organic matter and trace element concentrations in sapropels from ODP Leg 160 sites (1999)
    PANGAEA
    In:  Supplement to: Nijenhuis, Ivar A; Bosch, Hendrik-Jan; Sinninghe Damsté, Jaap S; Brumsack, Hans-Jürgen; de Lange, Gert J (1999): Organic matter and trace element rich sapropels and black shales: a geochemical comparison. Earth and Planetary Science Letters, 169(3-4), 227-290, https://doi.org/10.1016/S0012-821X(99)00083-7
    Details
    Publication Date: 2024-01-09
    Description: A distinct Pliocene eastern Mediterranean sapropel (i-282), recovered from three Ocean Drilling Program (ODP) Leg 160 Sites, has been investigated for its organic and inorganic composition. This sapropel is characterized by high organic carbon (Corg) and trace element contents, and the presence of isorenieratene derivatives. The latter suggests that the base of the photic zone was sulphidic during formation of the sapropel. Combined with evidence of bottom water anoxia (preservation of laminae, high redox-sensitive trace element contents, and the abundance and isotopic composition of pyrite) this leads to the tentative conclusion that almost the entire water column may have been anoxic. This anoxia resulted from high productivity and not from stagnation, because an approximation of the trace element budget during sapropel formation shows that water exchange with the western Mediterranean is needed. Entire water column anoxia has been suggested earlier for several black shales. With regard to the depositional environment and the Corg content, however, only the Cenomanian=Turonian Boundary Event (CTBE) black shales appear to be comparable to this sapropel. The proposed trace element removal mechanism of scavenging and (co-)precipitation in an anoxic water column, is thought to be similar for both types of deposits. The ultimate trace element source for the sapropel, however, is seawater, whereas it is hydrothermal and fluvial input for CTBE black shales (because they have a larger temporal and spatial distribution). Nonetheless, the Corg-rich eastern Mediterranean Pliocene sapropel discussed here may be considered to be a younger analogue of CTBE black shales.
    Keywords: 160-964D; 160-964E; 160-966C; 160-967C; 160-969E; DRILL; Drilling/drill rig; Eastern Basin; Joides Resolution; Leg160; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 4
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    Ogranic geochemistry and SST reconstruction for Pliocene and Miocene Madeira Abyssal Plain turbidites (1998)
    PANGAEA
    In:  Supplement to: Hoefs, Marcel JL; Versteegh, Gerard J M; Rijpstra, W Irene C; de Leeuw, Jan W; Sinninghe Damsté, Jaap S (1998): Postdepositional oxic degradation of alkenones: Implications for the measurement of palaeo sea surface temperatures. Paleoceanography, 13(1), 42-49, https://doi.org/10.1029/97PA02893
    Details
    Publication Date: 2024-01-09
    Description: Free and 'bound' long-chain alkenones (C37:2 and C37:3) in oxidized and unoxidized sections of four organic matter-rich Pliocene and Miocene Madeira Abyssal Plain turbidites (one from Ocean Drilling Program site 951B and three from site 952A) were analyzed to determine the effect of severe post depositional oxidation on the value of Uk'37. The profiles of both alkenones across the redox boundary show a preferential degradation of the C37:3 compared to the C37:2 compound. Because of the high initial Uk'37 values and the way of calculating the Uk'37 this degradation hardly influences the Uk'37 profiles. However, for lower Uk'37 values, measured selective degradation would increase Uk'37 up to 0.17 units, equivalent to 5°C. For most of the Uk'37 band-width, much smaller degradation already increases Uk'37 beyond the analytical error (0.017 units). Consequently, for interpreting the Uk'37 record in terms of past sea surface temperatures, selective degradation needs serious consideration.
    Keywords: Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 5
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    (Table 1) Geochemistry of Sapropels of the Mediterranean Sea (1997)
    PANGAEA
    In:  Supplement to: Passier, Hilde F; Bosch, Hendrik-Jan; Nijenhuis, Ivar A; Lourens, Lucas Joost; Böttcher, Michael Ernst; Leenders, Anke; Sinninghe Damsté, Jaap S; de Lange, Gert J; de Leeuw, Jan W (1999): Sulphidic Mediterranean surface waters during Pliocene sapropel formation. Nature, 397(6715), 146-149, https://doi.org/10.1038/16441
    Details
    Publication Date: 2024-01-09
    Description: Sapropels -organic-matter rich layers- are common in Neogene sediments of the eastern Mediterranean Sea. The formation of these layers has been attributed to climate-related increases in organic-matter production (Calvert et al., 1992, doi:10.1038/359223a0; Rossignol-Strick et al., 1982, doi:10.1038/295105a0; Rohling, 1994, doi:10.1016/0025-3227(94)90202-X) and increased organic-matter preservation due to oxygen depletion in more stagnant bottom waters (Rossignol-Strick et al., 1982, doi:10.1038/295105a0; Rohling, 1994, doi:10.1016/0025-3227(94)90202-X). Here we report that eastern Mediterranean Pliocene sapropels (Emeis et al., 1996, doi:10.2973/odp.proc.ir.160.102.1996) contain molecular fossils of a compound (isorenieratene) known to be synthesized by photosynthetic green sulphur bacteria, suggesting that sulphidic (euxinic) -and therefore anoxic- conditions prevailed in the photic zone of the water column. These sapropels also have a high trace-metal content, which is probably due to the efficient scavenging of these metals by precipitating sulphides in a euxinic water column. The abundance and sulphur-isotope composition of pyrite are consistent with iron sulphide formation in the water column. We conclude that basin-wide water-column euxinia occurred over substantial periods during Pliocene sapropel formation in the eastern Mediterranean Sea, and that the ultimate degradation of the increased organic-matter production was strongly influential in generating and sustaining the euxinic conditions.
    Keywords: 160-964D; 160-964E; 160-966C; 160-967C; 160-969E; Accumulation rate, total organic carbon; AGE; Barium; Cadmium; Carbon, organic, total; Code; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Eastern Basin; Enrichment factor; Event label; Isorenieratene derivative; Joides Resolution; Leg160; Molybdenum; Nickel; Ocean Drilling Program; ODP; Sample code/label; Selenium; Sulfur of pyrite; Vanadium; δ34S, pyrite
    Type: Dataset
    Format: text/tab-separated-values, 145 data points
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    DATA PANGAEA
  • 6
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    Organic carbon and total sulfur content and concentrations of selected molecular fossils for C/T black shales (Table 1) (1998)
    PANGAEA
    In:  Supplement to: Sinninghe Damsté, Jaap S; Köster, Jürgen (1998): A euxinic southern North Atlantic Ocean during the Cenomanian/Turonian oceanic anoxic event. Earth and Planetary Science Letters, 158(3-4), 165-173, https://doi.org/10.1016/S0012-821X(98)00052-1
    Details
    Publication Date: 2024-01-09
    Description: During mid-Cretaceous times large amounts of organic carbon (Corg) became sequestered in 'black shales', possibly due to 'oceanic anoxic events' characterized by the development of an extended oxygen minimum zone (OMZ). Here, we provide the first direct evidence for an open ocean OMZ in the Cenomanian/Turonian (C/T) southern North Atlantic and in fact show that the base of the photic zone was euxinic as revealed by molecular fossils from photosynthetic green sulfur bacteria in C/T black shales. This, together with evidence for bottom water anoxia and accumulation of redox-sensitive trace metals and hydrogen-rich organic matter, indicates a continuously euxinic water column. Concurrent with the high Corg accumulation rates, which are 15-150 times greater in the southern than in the northern North Atlantic, and the low biological productivity, this suggests that preservation controlled the accumulation of Corg in C/T black shales.
    Keywords: 103-641A; 11-105; 14-144; 41-367; 41-368; 51-417D; 80-551; 93-603B; Area/locality; Carbon, organic, total; Concentration of molecular fossils; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Element analyser CS, LECO; Elevation of event; Event label; Gas chromatography - Mass spectrometry (GC-MS); Glomar Challenger; Hopane isomerization; Joides Resolution; Latitude of event; Leg103; Leg11; Leg14; Leg41; Leg51; Leg80; Leg93; Longitude of event; North Atlantic/BASIN; North Atlantic/CONT RISE; North Atlantic/ESCARPMENT; North Atlantic/HILL; Ocean Drilling Program; ODP; Paleoelevation; Sample code/label; South Atlantic Ocean; Sulfur, total
    Type: Dataset
    Format: text/tab-separated-values, 183 data points
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    DATA PANGAEA
  • 7
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    (Table 1) TOC and free and bound alkenones in ODP Holes 157-952A and 157-951B sediments (1998)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 157-951B; 157-952A; Alkenone, C37:2; Alkenone, C37:3; Canarias Sea; Carbon, organic, total; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Epoch; Event label; Joides Resolution; Leg157; Ocean Drilling Program; ODP; Sample code/label; South Atlantic Ocean
    Type: Dataset
    Format: text/tab-separated-values, 77 data points
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    DATA PANGAEA
  • 8
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    (Table 2) Degradation factor, degradation ratios UK'37 and SST reconstruction for ODP Holes 157-952A and 157-951B sediments (1998)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 157-951B; 157-952A; Alkenone, unsaturation index UK'37; Calculated from UK'37 (Prahl et al., 1988); Canarias Sea; Degradation factor; Degradation rate; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Joides Resolution; Leg157; Ocean Drilling Program; ODP; Ratio; Sample code/label; Sea surface temperature, annual mean; South Atlantic Ocean
    Type: Dataset
    Format: text/tab-separated-values, 114 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 9
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    (Table 1) Sapropel location in ODP Leg 160 sites (1999)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 160-964D; 160-964E; 160-966C; 160-967C; 160-969E; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Eastern Basin; Event label; Joides Resolution; Leg160; Ocean Drilling Program; ODP; Sample code/label; Sample code/label 2; Sample comment
    Type: Dataset
    Format: text/tab-separated-values, 18 data points
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    DATA PANGAEA
  • 10
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    (Table 2) Trace element concentrations of sapropels from ODP Leg 160 sites (1999)
    PANGAEA
    Details
    Publication Date: 2024-04-16
    Keywords: 160-964D; 160-964E; 160-966C; 160-967C; 160-969E; Antimony; Antimony, maximum; Arsenic; Arsenic, maximum; Cadmium; Cadmium, maximum; Carbon, organic, total; Carbon, organic, total, maximum; Chromium; Chromium, maximum; Cobalt; Cobalt, maximum; Comment; Copper; Copper, maximum; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Eastern Basin; Element analyser, Fisons NA 1500 NCS; Event label; Inductively coupled plasma atomic emission spectroscope (ICP-AES); Joides Resolution; Leg160; Molybdenum; Molybdenum, maximum; Nickel; Nickel, maximum; Ocean Drilling Program; ODP; Sample code/label; Sample code/label 2; Sample comment; Selenium; Selenium, maximum; Vanadium; Vanadium, maximum; Zinc; Zinc, maximum
    Type: Dataset
    Format: text/tab-separated-values, 222 data points
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    DATA PANGAEA
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