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| Main Authors: | , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2025
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| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.984536 |
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| _version_ | 1867169169358716928 |
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| author | Huang, Huang Frank, Martin |
| author_facet | Huang, Huang Frank, Martin |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Lead (Pb) isotope measurements are performed in the ferromanganese crust PS75/247-2, dredged on the southern flank of Haxby Seamount in the Pacific sector of the SO. We apply laser ablation coupled with multiple-collector inductively coupled plasma mass spectrometry (LA-MC-ICPMS) and two-dimensional (2D) mapping techniques. This combined novel approach enables us to confidently resolve orbital Pb isotope variations for the past 800 ka. Pb isotope is a sensitive water mass tracer and our results reveal systematically higher 208Pb/206Pb ratios during lukewarm interglacials than during more recent interglacials while 206Pb/204Pb ratios remained similar, suggesting reduced vertical deep-water mixing in the Southern Ocean during lukewarm interglacials. By enhancing deep-sea carbon sequestration and thereby lowering atmospheric CO2, strengthened deep Southern Ocean stratification likely imposed critical impacts on the lukewarm interglacial climates. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_984536 |
| institution | PANGAEA |
| language | en |
| publishDate | 2025 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Pleistocene Pb isotope records of crust Haxby from PS75/247-2 Huang, Huang Frank, Martin Age, dated; ANT-XXVI/3; Dredge; DRG; Haxby Seamount (Marie Byrd Seamounts); Lead-206/Lead-204 ratio; Lead-208/Lead-206 ratio; MC-ICPMS; Multicollector-inductively coupled plasma mass spectrometer; Polarstern; PS75; PS75/247-2 Lead (Pb) isotope measurements are performed in the ferromanganese crust PS75/247-2, dredged on the southern flank of Haxby Seamount in the Pacific sector of the SO. We apply laser ablation coupled with multiple-collector inductively coupled plasma mass spectrometry (LA-MC-ICPMS) and two-dimensional (2D) mapping techniques. This combined novel approach enables us to confidently resolve orbital Pb isotope variations for the past 800 ka. Pb isotope is a sensitive water mass tracer and our results reveal systematically higher 208Pb/206Pb ratios during lukewarm interglacials than during more recent interglacials while 206Pb/204Pb ratios remained similar, suggesting reduced vertical deep-water mixing in the Southern Ocean during lukewarm interglacials. By enhancing deep-sea carbon sequestration and thereby lowering atmospheric CO2, strengthened deep Southern Ocean stratification likely imposed critical impacts on the lukewarm interglacial climates. |
| title | Pleistocene Pb isotope records of crust Haxby from PS75/247-2 |
| topic | Age, dated; ANT-XXVI/3; Dredge; DRG; Haxby Seamount (Marie Byrd Seamounts); Lead-206/Lead-204 ratio; Lead-208/Lead-206 ratio; MC-ICPMS; Multicollector-inductively coupled plasma mass spectrometer; Polarstern; PS75; PS75/247-2 |
| url | https://doi.org/10.1594/PANGAEA.984536 |