Stable carbon and oxygen isotope ratios of Cibicidoides wuellerstorfi (Table 1)
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| Sprache: | en |
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PANGAEA
2008
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| _version_ | 1867169966322614272 |
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| author | Hönisch, Bärbel Bickert, Torsten Hemming, N Gary |
| author_facet | Hönisch, Bärbel Bickert, Torsten Hemming, N Gary |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_725482 |
| institution | PANGAEA |
| language | en |
| publishDate | 2008 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Stable carbon and oxygen isotope ratios of Cibicidoides wuellerstorfi (Table 1) Hönisch, Bärbel Bickert, Torsten Hemming, N Gary AGE; Angola Basin; Cape Basin; Cibicidoides wuellerstorfi, δ13C; Cibicidoides wuellerstorfi, δ18O; DEPTH, sediment/rock; Elevation of event; Event label; GeoB1032-2; GeoB1032-3; GeoB1034-1; GeoB1034-3; GeoB1035-2; GeoB1035-4; GeoB1211-1; GeoB1211-3; GeoB1214-1; GeoB1214-2; GeoB1220-1; GeoB1220-2; GeoB1710-2; Giant box corer; GKG; Gravity corer (Kiel type); Isotope ratio mass spectrometry; Latitude of event; Longitude of event; M12/1; M20/2; M6/6; Meteor (1986); MUC; MultiCorer; Namibia Continental Margin; SL; Walvis Ridge 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. |
| title | Stable carbon and oxygen isotope ratios of Cibicidoides wuellerstorfi (Table 1) |
| topic | AGE; Angola Basin; Cape Basin; Cibicidoides wuellerstorfi, δ13C; Cibicidoides wuellerstorfi, δ18O; DEPTH, sediment/rock; Elevation of event; Event label; GeoB1032-2; GeoB1032-3; GeoB1034-1; GeoB1034-3; GeoB1035-2; GeoB1035-4; GeoB1211-1; GeoB1211-3; GeoB1214-1; GeoB1214-2; GeoB1220-1; GeoB1220-2; GeoB1710-2; Giant box corer; GKG; Gravity corer (Kiel type); Isotope ratio mass spectrometry; Latitude of event; Longitude of event; M12/1; M20/2; M6/6; Meteor (1986); MUC; MultiCorer; Namibia Continental Margin; SL; Walvis Ridge |
| url | https://doi.org/10.1594/PANGAEA.725482 |