Anderson, Patricia A; Charles, Christopher D; Berger, Wolfgang H (2001): (Table AT1) Grain size distribution and stable isotope record of benthic foraminifera of ODP Hole 175-1085A [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.203893, Supplement to: Anderson, PA et al. (2001): Walvis Paradox confirmed for the Early Quaternary at the Southern End of the Namibia upwelling system, ODP Site 10851. In: Wefer, G; Berger, WH; Richter, C (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 175, 1-31, https://doi.org/10.2973/odp.proc.sr.175.201.2001
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Abstract:
The Walvis Paradox states that opal accumulation fluctuates in counterphase to general productivity on Walvis Ridge, off northern Namibia. Sediments of early Quaternary age from Site 1085 (Cores 175-1085A-7H to 10H, off South Africa) were studied to check the phase relationships of general productivity and opal deposition in the region off the Oranje River, near the southern end of the Namibia upwelling system. The proxies used are delta18O of Cibicidoides wuellerstorfi, delta13C of C. wuellerstorfi, benthic foraminifers per gram (BF/g), Uvigerina spp. per gram (U/g), estimated diatom abundance (EDA) and sulfide and oxide aggregates (SOA) in the coarse fraction. EDA and BF/g are taken to indicate diatom and organic matter productivity, respectively. Oxygen isotopes were used to determine phase within the glacial-interglacial cycles.
The phase relationships between the different proxies emerge when applying internal stacking methods. For Core 175-1085A-7H, five prescribed 41-k.y. cycles were combined into an average 41-k.y. cycle for the different indices. Productivity indices (BF/g and U/g) tend to follow delta18O in the accustomed manner (with glacial periods showing maximum productivity), but not EDA, whose maximum appears closer to interglacials, offset toward cooling. Thus, phase relationships are similar to those on Walvis Ridge, extending the Walvis Paradox to the southern end of the Namibia upwelling system for the early Quaternary. A tentative reconstruction of the phase of intensity of mixing is given, based on the two productivity indicators EDA and BF/g. Mixing is strongest during the glacial maximum.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: -29.374410 * Longitude: 13.990110
Date/Time Start: 1997-09-26T00:15:00 * Date/Time End: 1997-09-29T18:15:00
Minimum DEPTH, sediment/rock: 51.22 m * Maximum DEPTH, sediment/rock: 87.61 m
Event(s):
175-1085A * Latitude: -29.374410 * Longitude: 13.990110 * Date/Time Start: 1997-09-26T00:15:00 * Date/Time End: 1997-09-29T18:15:00 * Elevation: -1713.2 m * Penetration: 604 m * Recovery: 594.39 m * Location: Benguela Current, South Atlantic Ocean * Campaign: Leg175 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 64 cores; 604 m cored; 0 m drilled; 98.4 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | AGE | Age | ka BP | Geocode | ||
| 3 | Sample code/label | Sample label | Berger, Wolfgang H | DSDP/ODP/IODP sample designation | ||
| 4 | Sample ID | Sample ID | Berger, Wolfgang H | Sample number | ||
| 5 | Depth, top/min | Depth top | m | Berger, Wolfgang H | ||
| 6 | Depth, sediment revised | Depth revised | m | Berger, Wolfgang H | ||
| 7 | Age, minimum/young | Age min | ka | Berger, Wolfgang H | Initial age by upper depth | |
| 8 | Size fraction > 0.063 mm, sand | >63 µm | % | Berger, Wolfgang H | total dry sediment | |
| 9 | Size fraction > 0.250 mm | >250 µm | % | Berger, Wolfgang H | total sand | |
| 10 | Cibicidoides wuellerstorfi, δ18O | C. wuellerstorfi δ18O | ‰ PDB | Berger, Wolfgang H | Mass spectrometer Finnigan MAT 252 | |
| 11 | Cibicidoides wuellerstorfi, δ13C | C. wuellerstorfi δ13C | ‰ PDB | Berger, Wolfgang H | Mass spectrometer Finnigan MAT 252 | |
| 12 | Uvigerina peregrina, δ18O | U. peregrina δ18O | ‰ PDB | Berger, Wolfgang H | Mass spectrometer Finnigan MAT 252 | |
| 13 | Uvigerina peregrina, δ13C | U. peregrina δ13C | ‰ PDB | Berger, Wolfgang H | Mass spectrometer Finnigan MAT 252 | |
| 14 | δ18O, carbonate | δ18O carb | ‰ PDB | Berger, Wolfgang H | Calculated, see reference(s) | d18O index |
| 15 | δ13C, carbonate | δ13C carb | ‰ PDB | Berger, Wolfgang H | Calculated, see reference(s) | d13C index |
| 16 | Uvigerina spp. | Uvigerina spp. | #/g | Berger, Wolfgang H | Counting >250 µm fraction | |
| 17 | Foraminifera, benthic | Foram benth | #/g | Berger, Wolfgang H | Counting 150-250 µm fraction | |
| 18 | Diatom abundance | Diatom abund | Berger, Wolfgang H | Smear slide analysis | estimated diatom abundance (EDA), indices are subjective estimates of ranked abundance from barren to extremely abundant [0 to 6] | |
| 19 | Aggregates | Agg | Berger, Wolfgang H | Smear slide analysis | sulfide and oxide aggregates (SOA), indices are subjective estimates of ranked abundance from barren to extremely abundant [0 to 6] | |
| 20 | Comment | Comment | Berger, Wolfgang H | 1 = clean sample; 2 = clumps; 3 = fibers; 4 = cement; 5 = casts; 6 = Uvigerina matrix; 7 = fish teeth, bones, and otoliths; 8 = radiolarians; 9 = sponge spicules; 10 = orange metal; 11 = rounded corners from too much sieve |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3184 data points
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