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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. 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):
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):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepthmGeocode
2AGEAgeka BPGeocode
3Sample code/labelSample labelBerger, Wolfgang HDSDP/ODP/IODP sample designation
4Sample IDSample IDBerger, Wolfgang HSample number
5Depth, top/minDepth topmBerger, Wolfgang H
6Depth, sediment revisedDepth revisedmBerger, Wolfgang H
7Age, minimum/youngAge minkaBerger, Wolfgang HInitial age by upper depth
8Size fraction > 0.063 mm, sand>63 µm%Berger, Wolfgang Htotal dry sediment
9Size fraction > 0.250 mm>250 µm%Berger, Wolfgang Htotal sand
10Cibicidoides wuellerstorfi, δ18OC. wuellerstorfi δ18O‰ PDBBerger, Wolfgang HMass spectrometer Finnigan MAT 252
11Cibicidoides wuellerstorfi, δ13CC. wuellerstorfi δ13C‰ PDBBerger, Wolfgang HMass spectrometer Finnigan MAT 252
12Uvigerina peregrina, δ18OU. peregrina δ18O‰ PDBBerger, Wolfgang HMass spectrometer Finnigan MAT 252
13Uvigerina peregrina, δ13CU. peregrina δ13C‰ PDBBerger, Wolfgang HMass spectrometer Finnigan MAT 252
14δ18O, carbonateδ18O carb‰ PDBBerger, Wolfgang HCalculated, see reference(s)d18O index
15δ13C, carbonateδ13C carb‰ PDBBerger, Wolfgang HCalculated, see reference(s)d13C index
16Uvigerina spp.Uvigerina spp.#/gBerger, Wolfgang HCounting >250 µm fraction
17Foraminifera, benthicForam bent#/gBerger, Wolfgang HCounting 150-250 µm fraction
18Diatom abundanceDiatom abundBerger, Wolfgang HSmear slide analysisestimated diatom abundance (EDA), indices are subjective estimates of ranked abundance from barren to extremely abundant [0 to 6]
19AggregatesAggBerger, Wolfgang HSmear slide analysissulfide and oxide aggregates (SOA), indices are subjective estimates of ranked abundance from barren to extremely abundant [0 to 6]
20CommentCommentBerger, Wolfgang H1 = 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
Size:
3184 data points

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