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Feakins, Sarah J; Eglinton, Timothy Ian; deMenocal, Peter B (2007): Biomarker records of DSDP Hole 24-231 and terrestrial sediments [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.763246, Supplement to: Feakins, SJ et al. (2007): A comparison of biomarker records of northeast African vegetation from lacustrine and marine sediments (ca. 3.40 Ma). Organic Geochemistry, 38(10), 1607-1624, https://doi.org/10.1016/j.orggeochem.2007.06.008

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Abstract:
ntegrated terrestrial and marine records of northeast African vegetation are needed to provide long high resolution records of environmental variability with established links to specific terrestrial environments. In this study, we compare records of terrestrial vegetation preserved in marine sediments in the Gulf of Aden [Deep Sea Drilling Project (DSDP) Site 231] and an outcrop of lacustrine sediments in the Turkana Basin, Kenya, part of the East African Rift System. We analyzed higher plant biomarkers in sediments from both deposits of known equivalent age, corresponding to a ca. 50-100 ka humid interval prior to the b-Tulu Bor eruption ca. 3.40 Ma, when the Lokochot Lake occupied part of the Turkana Basin. Molecular abundance distributions indicate that long chain n-alkanoic acids in marine sediments are the most reliable proxy for terrestrial vegetation (Carbon Preference Index, CPI = 4.5), with more cautious interpretation needed for n-alkanes and lacustrine archives. Marine sediments record carbon isotopic variability in terrestrial biomarkers of 2-3 per mil, roughly equivalent to 20% variability in the C3/C4 vegetation contribution. The proportion of C4 vegetation apparently increased at times of low terrigenous dust input. Terrestrial sediments reveal much larger (2-10 per mil) shifts in n-alkanoic acid delta13C values. However, molecular abundance and isotopic composition suggest that microbial sources may also contribute fatty acids, contaminating the lacustrine sedimentary record of terrestrial vegetation.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 7.775100 * Median Longitude: 42.247600 * South-bound Latitude: 3.660000 * West-bound Longitude: 36.250000 * North-bound Latitude: 11.890200 * East-bound Longitude: 48.245200
Date/Time Start: 1972-05-04T00:00:00 * Date/Time End: 1972-05-04T00:00:00
Event(s):
24-231 * Latitude: 11.890200 * Longitude: 48.245200 * Date/Time: 1972-05-04T00:00:00 * Elevation: -2152.0 m * Penetration: 584 m * Recovery: 425.8 m * Location: Indian Ocean/Gulf of Aden/BASIN * Campaign: Leg24 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 64 cores; 583.7 m cored; 0 m drilled; 72.9 % recovery
Wargolo * Latitude: 3.660000 * Longitude: 36.250000 * Location: Kenya * Method/Device: Outcrop sample (OUTCROP)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Feakins, SJ; Eglinton, TI; deMenocal, PB (2007): (Table 2a) Molecular abundances of n-alkanoic acid biomarkres in DSDP Hole 24-231. https://doi.org/10.1594/PANGAEA.763241
  2. Feakins, SJ; Eglinton, TI; deMenocal, PB (2007): (Table 3a) Carbon isotopic composition of n-alkanes and n-alkanoic acid biomarkers of DSDP Hole 24-231. https://doi.org/10.1594/PANGAEA.763244
  3. Feakins, SJ; Eglinton, TI; deMenocal, PB (2007): (Table 2b) Molecular abundances of n-alkanoic acid biomarkres of terrestrial samples from Wargolo, Turkana Basin. https://doi.org/10.1594/PANGAEA.763242
  4. Feakins, SJ; Eglinton, TI; deMenocal, PB (2007): (Table 3b) Carbon isotopic composition of n-alkanes and n-alkanoic acid biomarkers of terrestrial samples of Wargolo, Turkan Basin. https://doi.org/10.1594/PANGAEA.763245