Hoefs, Marcel JL; Versteegh, Gerard J M; Rijpstra, W Irene C; de Leeuw, Jan W; Sinninghe Damsté, Jaap S (1998): Ogranic geochemistry and SST reconstruction for Pliocene and Miocene Madeira Abyssal Plain turbidites [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.866399, Supplement to: Hoefs, MJL et al. (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
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Abstract:
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.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 31.411150 * Median Longitude: -24.690050 * South-bound Latitude: 30.790800 * West-bound Longitude: -24.870600 * North-bound Latitude: 32.031500 * East-bound Longitude: -24.509500
Date/Time Start: 1994-08-13T11:40:00 * Date/Time End: 1994-08-20T11:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Hoefs, MJL; Versteegh, GJM; Rijpstra, WIC et al. (1998): (Table 2) Degradation factor, degradation ratios UK'37 and SST reconstruction for ODP Holes 157-952A and 157-951B sediments. https://doi.org/10.1594/PANGAEA.866398
- Hoefs, MJL; Versteegh, GJM; Rijpstra, WIC et al. (1998): (Table 1) TOC and free and bound alkenones in ODP Holes 157-952A and 157-951B sediments. https://doi.org/10.1594/PANGAEA.866396