Huguet, Carme; de Lange, Gert J; Gustafsson, Örjan; Middelburg, Jack J; Sinninghe Damsté, Jaap S; Schouten, Stefan (2008): (Table 1) TOC, δ¹³C, and preservation factors of turbidite sediments [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.818287, Supplement to: Huguet, C et al. (2008): Selective preservation of soil organic matter in oxidized marine sediments (Madeira Abyssal Plain). Geochimica et Cosmochimica Acta, 72(24), 6061-6068, https://doi.org/10.1016/j.gca.2008.09.021
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Abstract:
In ocean margin sediments both marine and terrestrial organic matter (OM) are buried but the factors governing their relative preservation and degradation are not well understood. In this study, we analysed the degree of preservation of marine isoprenoidal and soil-derived branched glycerol dialkyl glycerol tetraethers (GDGTs) upon long-term oxygen exposure in OM-rich turbidites from the Madeira Abyssal Plain by analyzing GDGT concentrations across oxidation fronts. Relative to the anoxic part of the turbidites ca. 7-20% of the soil-derived branched GDGTs were preserved in the oxidized part while only 0.2-3% of the marine isoprenoid GDGT crenarchaeol was preserved. Due to these different preservation factors the Branched Isoprenoid Tetraether (BIT) index, a ratio between crenarchaeol and the major branched GDGTs that is used as a tracer for soil-derived organic matter, substantially increases from 0.02 to 0.4. Split Flow Thin Cell (SPLITT) separation of turbidite sediments showed that the enhanced preservation of soil-derived carbon was a general phenomenon across the fine particle size ranges (<38 mm). Calculations reveal that, despite their relatively similar chemical structures, degradation rates of crenarchaeol are 2-fold higher than those of soil-derived branched GDGTs, suggesting preferential soil OM preservation possibly due to matrix protection.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 31.624117 * Median Longitude: -24.527240 * South-bound Latitude: 30.790800 * West-bound Longitude: -24.870550 * North-bound Latitude: 32.050000 * East-bound Longitude: -24.201670
Date/Time Start: 1994-08-11T00:00:00 * Date/Time End: 1994-08-20T00:00:00
Minimum DEPTH, sediment/rock: 10.6850 m * Maximum DEPTH, sediment/rock: 10.9700 m
Event(s):
157-951 * Latitude: 32.031550 * Longitude: -24.870550 * Date/Time Start: 1994-08-11T00:00:00 * Date/Time End: 1994-08-15T00:00:00 * Elevation: -5448.0 m * Penetration: 608.2 m * Recovery: 336 m * Location: South Atlantic Ocean * Campaign: Leg157 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 38 cores; 353.2 m cored; 0 m drilled; 95.1% recovery
157-952 * Latitude: 30.790800 * Longitude: -24.509500 * Date/Time Start: 1994-08-15T00:00:00 * Date/Time End: 1994-08-20T00:00:00 * Elevation: -5443.0 m * Penetration: 425.9 m * Recovery: 415.2 m * Location: Canarias Sea * Campaign: Leg157 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 45 cores; 425.9 m cored; 0 m drilled; 97.5% recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Huguet, Carme | DSDP/ODP/IODP sample designation | ||
| 3 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 4 | Carbon, organic, total | TOC | % | Huguet, Carme | ||
| 5 | δ13C, organic carbon | δ13C Corg | ‰ PDB | Huguet, Carme | ||
| 6 | Preservation factor | Pf | % | Huguet, Carme | TOC | |
| 7 | Preservation factor | Pf | % | Huguet, Carme | crenarchaeol | |
| 8 | Preservation factor | Pf | % | Huguet, Carme | branched GDGTs |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
80 data points