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Hönisch, Bärbel; Bickert, Torsten; Hemming, N Gary (2008): Stable carbon and oxygen isotope ratios of Cibicidoides wuellerstorfi (Table 1). PANGAEA,, Supplement to: Hönisch, B et al. (2008): Modern and Pleistocene boron isotope composition of the benthic foraminifer Cibicidoides wuellerstorfi. Earth and Planetary Science Letters, 272(1-2), 309-318,

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Here we present the first species-specific study of boron isotopes in the epibenthic foraminifer species Cibicidoides wuellerstorfi. Coretop samples from a water depth profile from 1000 to 4500 m on the northern flank of the Walvis Ridge are 4.4 per mil lower than the values expected, based on calculations of the delta 11B(borate) of ambient seawater. Similar values for this foraminifer species are presented from ODP site 668B at the Sierra Leone Rise, in the equatorial Atlantic. The consistency between data of the same species suggests the offsets are primary, rather than diagenetic. Glacial C. wuellerstorfi from ODP 668B and Walvis Ridge have boron isotope compositions only slightly different to interglacial samples, that is no larger than +0.10 pH units, or +23 µmol/kg in [CO3[2-]] above the reconstructed glacial lysocline, and -0.07 pH units, or -14 µmol/kg in [CO3[2-]] below. We use these results to suggest that glacial deep water pH in the Atlantic was similar to interglacial pH. The new data resolve the inconsistency between the previously reported high bottom water pH and the lack of significant carbonate preservation of the glacial deep ocean.
Median Latitude: -23.254487 * Median Longitude: 6.527307 * South-bound Latitude: -24.690000 * West-bound Longitude: 5.028333 * North-bound Latitude: -21.586667 * East-bound Longitude: 11.703333
Date/Time Start: 1988-03-04T00:00:00 * Date/Time End: 1992-01-11T00:00:00
Minimum DEPTH, sediment/rock: 0.005 m * Maximum DEPTH, sediment/rock: 0.380 m
GeoB1032-2 * Latitude: -22.913333 * Longitude: 6.026667 * Date/Time: 1988-03-04T00:00:00 * Elevation: -2490.0 m * Penetration: 0.32 m * Location: Walvis Ridge * Campaign: M6/6 * Basis: Meteor (1986) * Method/Device: Giant box corer (GKG) * Comment: Foram.-schl., weiß, Pterop.
GeoB1032-3 * Latitude: -22.915000 * Longitude: 6.036667 * Date/Time: 1988-03-04T00:00:00 * Elevation: -2505.0 m * Penetration: 12 m * Location: Angola Basin * Campaign: M6/6 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL) * Comment: Foram.-schlamm, sandig
GeoB1034-1 * Latitude: -21.721667 * Longitude: 5.430000 * Date/Time: 1988-03-04T00:00:00 * Elevation: -3731.0 m * Penetration: 0.25 m * Location: Walvis Ridge * Campaign: M6/6 * Basis: Meteor (1986) * Method/Device: Giant box corer (GKG) * Comment: Foram.-schlamm, weiß
Age assignments according to benthic oxygen isotope stratigraphy of GeoB cores (Bickert and Mackensen, 2003)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Latitude of eventLatitude
3Longitude of eventLongitude
4Elevation of eventElevationm
5DEPTH, sediment/rockDepth sedmGeocode
6AGEAgeka BPGeocode
7Cibicidoides wuellerstorfi, δ13CC. wuellerstorfi δ13C‰ PDBHönisch, BärbelIsotope ratio mass spectrometry
8Cibicidoides wuellerstorfi, δ18OC. wuellerstorfi δ18O‰ PDBHönisch, BärbelIsotope ratio mass spectrometry
26 data points

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