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  • Data  (27)
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  • 1
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    Alkenone-derived UK'37 data and sea surface temperatures (SST) of sediment core GT91-1
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Age; Alkenone, unsaturation index UK'37; Calculated after Conte et al. (2006); GC; Gravity corer; GT91-1; Gulf of Taranto; Sea surface temperature
    Type: Dataset
    Format: text/tab-separated-values, 348 data points
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  • 2
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    Alkenone-derived UK'37 data and sea surface temperatures (SST) of sediment cores from the Gulf of Taranto (Italy)
    PANGAEA
    In:  Supplement to: Versteegh, Gerard J M; de Leeuw, Jan W; Taricco, Carla; Romero, A (2007): Temperature and productivity influences on UK'37 and their possible relation to solar forcing of the Mediterranean winter. Geochemistry, Geophysics, Geosystems, 8, Q9005, https://doi.org/10.1029/2006GC001543
    Details
    Publication Date: 2023-05-12
    Description: Auxiliary data include one file with alkenone-derived UK'37 data and sea surface temperatures (SST). On these data Figs. 7 and 8 of the manuscript are based. The SST are derived from UK'37 by using the transfer function: SST = 29.876 UK'37 - 1.334 of Conte et al. (2006). The data are against the ages (in A.D.) of samples derived from cores GT91-1 (39[deg]59'23"N, 17[deg]45'25"E), GT89-3 and GT90-3 (both 39[deg]45'43"N, 17[deg]53'55"E ). Also included are composite records for UK'37 and SST. For creating the composite records, GT-89-3 was taken as reference core. In the overlapping period the GT89-3 data seem in general lower than the GT91-1 data. To accommodate for this in the composite record, the average difference (0.0343 UK'37 units; equivalent to 1.023 [deg]C) was subtracted from the GT91-1 record. Hereafter, for each depth in the overlapping interval the respective values (UK'37 or SST) of GT89-3 and GT91-1 were averaged. We have also averaged with 16 additional alkenone measurements, from 1793 to 1851, performed in the GT90-3 core.
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 3
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    (Table 1) Organic carbon contents and vitrinite reflection in sediments from DSDP Holes 63-467, 63-471, and 64-481A
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Description: A number of C25 and C30 highly branched isoprenoid (HBI) sulphur compounds (E.G., thiolanes, 1-oxo-thiolanes, thiophenes, and benzo[b]thiophenes) with 2,6,10,14-tetramethyl-7-(3-methylpentyl)pentadecane and 2,6,10,14,18-pentamethyl-7-(3-methylpentyl)nonadecane carbon skeletons were identified in sediments, ranging from Holocene to Upper Cretaceous. These identifications are based on mass spectral characterisation, desulphurisation, and, in some cases, by comparison of mass spectral and relative retention time data with those of authentic standards. The presence of unsaturated C25 and C30 HBI thiolanes in a Recent sediment from the Black Sea (age 3-6 ka) strongly supports their formation during early diagenesis. The co-occurrence of HBI polyenes (C25 and C30) and unsaturated HBI thiolanes (C25 and C30) possessing two double bonds less than the corresponding HBI polyenes, in this Recent sediment, testifies to the formation of unsaturated HBI thiolanes by a reaction of inorganic sulphur species with double bonds of the HBI polyenes. Furthermore, a diagenetic scheme for HBI sulphur compounds is proposed based on the identification of HBI sulphur compounds in sediment samples with different maturity levels.
    Keywords: 63-467; 63-471; 64-481A; Carbon, organic, total; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Epoch; Event label; Glomar Challenger; Latitude of event; Leg63; Leg64; Longitude of event; North Pacific/FAN; North Pacific/GAP; North Pacific/Gulf of California/BASIN; Rock type; Sample code/label; Vitrinite reflection
    Type: Dataset
    Format: text/tab-separated-values, 25 data points
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  • 4
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    Alkenone-derived UK'37 data and sea surface temperatures (SST) of sediment core GT89-3
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Age; Alkenone, unsaturation index UK'37; Calculated after Conte et al. (2006); GC; Gravity corer; GT89-3; Gulf of Taranto; Sea surface temperature
    Type: Dataset
    Format: text/tab-separated-values, 352 data points
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  • 5
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    Alkenone-derived UK'37 data and sea surface temperatures (SST) of sediment core GT90-3
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Age; Alkenone, unsaturation index UK'37; Calculated after Conte et al. (2006); GC; Gravity corer; GT90-3; Gulf of Taranto; Sea surface temperature
    Type: Dataset
    Format: text/tab-separated-values, 212 data points
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  • 6
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    Alkenone-derived UK'37 data and sea surface temperatures (SST) of a combined sediment core
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Age; Alkenone, unsaturation index UK'37; Calculated after Conte et al. (2006); GC; Gravity corer; GT89-3; Gulf of Taranto; Sea surface temperature
    Type: Dataset
    Format: text/tab-separated-values, 494 data points
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  • 7
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    Total organic carbon content and isorenieratene concentrations from three holes of ODP Leg 160 (2002)
    PANGAEA
    In:  Supplement to: Menzel, D W; Hopmans, Ellen C; van Bergen, P F; de Leeuw, Jan W; Sinninghe Damsté, Jaap S (2002): Development of photic zone euxinia in the eastern Mediterranean Basin during deposition of Pliocene sapropels. Marine Geology, 189(3-4), 215-226, https://doi.org/10.1016/S0025-3227(02)00479-6
    Details
    Publication Date: 2024-01-09
    Description: Carotenoids were analysed in ca. 1-cm thick subsamples of three laterally time-equivalent sapropels from a west-east transect of the eastern Mediterranean Basin to study euxinic periods during Pliocene sapropel formation. The amount of intact isorenieratene (summed all-trans and cis isomers), ranged from non-detectable at the base and top of a sapropel up to 140 µg/g sediment in the central parts. Isorenieratene accumulation rates at the central and western site are remarkably similar and increase sharply to levels of up to 3.0 mg/m**2/ yr in the central part of the sapropel and then drop to low levels. This pattern indicates an expansion of euxinic conditions reaching into the photic zone, followed by deepening of the chemocline during deposition of this Pliocene sapropel. The sapropel from the easternmost site of the basin, which contains less organic carbon, shows much lower isorenieratene accumulation rates and even absence of isorenieratene in the central part of the sapropel. Ba/Al ratios indicate enhanced palaeoproductivity during sapropel formation, supporting previously proposed models, according to which increased productivity is the driving force for the generation of euxinic conditions.
    Keywords: 160-964D; 160-967C; 160-969E; DRILL; Drilling/drill rig; Eastern Basin; Joides Resolution; Leg160; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 8
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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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  • 9
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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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  • 10
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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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