Brzelinski, Swaantje; Fischer, Alexa; Friedrich, Oliver (2026): Late Oligocene (26.2-25.2 Ma) stable oxygen isotopes and Mg/Ca of benthic foraminifera from ODP Site 113-689 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.988411
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Published: 2026-01-08 • DOI registered: 2026-01-08
Abstract:
This dataset features stable oxygen isotopes and Mg/Ca ratios of foraminifera from ODP Site 689, Maud Rise (64.5°S, 3.1°E, 2080 m water depth) spanning the late Oligocene (26.2 to 25.2 Ma). The age model was established following the magnetostratigraphic constraints of Florindo and Roberts (2005, doi:10.1130/B25541.1) and tuned to the age model of IODP Site 342-U1406 (van Peer et al., 2024, doi:10.1038/s41467-024-54186-1). The stable oxygen isotopes (d18O, in ‰ VPDB) were analysed on the benthic foraminiferal species Oridorsalis umbonatus and Cibicidoides mundulus, using a ThermoFinnigan MAT253Plus gas source mass spectrometer equipped with a Thermo Fisher Scientific Kiel IV carbonate device at Heidelberg University. The isotopic values are reported relative to the Vienna Pee Dee Belemnite (VPDB) standard, through the analysis of an in-house standard (Solnhofen limestone) calibrated to IAEA-603. Mg/Ca ratios analyses were performed on the benthic foraminiferal species Oridorsalis umbonatus, using an Agilent Inductively Coupled Plasma-Optical Emission Spectrometer 720 at Heidelberg University. The reported Mg/Ca values were normalised relative to the ECRM 752-1 standard.
Keyword(s):
Supplement to:
Creac'h, Layla; Brzelinski, Swaantje; Lippold, Jörg; Gutjahr, Marcus; Frank, Martin; Fischer, Alexa; Friedrich, Oliver (in review): Short term Antarctic ice-sheet dynamics during the late Oligocene. Communications Earth & Environment
References:
Florindo, Fabio; Roberts, Andrew P (2005): Eocene-Oligocene magnetobiochronology of ODP Sites 689 and 690, Maud Rise, Weddell Sea, Antarctica. Geological Society of America Bulletin, 117(1-2), 46-66, https://doi.org/10.1130/B25541.1
van Peer, Tim E; Liebrand, Diederik; Taylor, Victoria E; Brzelinski, Swaantje; Wolf, Iris; Bornemann, André; Friedrich, Oliver; Bohaty, Steven M; Xuan, Chuang; Lippert, Peter C; Wilson, Paul A (2024): Eccentricity pacing and rapid termination of the early Antarctic ice ages. Nature Communications, 15(1), 10600, https://doi.org/10.1038/s41467-024-54186-1
Funding:
German Research Foundation (DFG), grant/award no. 428548445: Short-term waxing and waning of Antarctic ice sheets during the late Oligocene
Coverage:
Latitude: -64.517000 * Longitude: 3.100400
Date/Time Start: 1987-01-18T12:30:00 * Date/Time End: 1987-01-19T09:00:00
Minimum DEPTH, sediment/rock: 69.42 m * Maximum DEPTH, sediment/rock: 77.48 m
Event(s):
113-689D * Latitude: -64.517000 * Longitude: 3.100400 * Date/Time Start: 1987-01-18T12:30:00 * Date/Time End: 1987-01-19T09:00:00 * Elevation: -2091.0 m * Penetration: 133.8 m * Recovery: 115.97 m * Location: South Atlantic Ocean * Campaign: Leg113 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 12 cores; 115.7 m cored; 0 m drilled; 100.2 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample code/label | Sample label | Creac'h, Layla | DSDP/ODP/IODP sample designation | ||
| 2 | DEPTH, sediment/rock | Depth sed | m | Creac'h, Layla | Geocode | |
| 3 | Age | Age | Ma | Creac'h, Layla | ||
| 4 | Cibicidoides mundulus, δ18O | C. mundulus δ18O | ‰ PDB | Creac'h, Layla | Isotope ratio mass spectrometer (IRMS), Thermo Fisher, MAT253 | vs. VPDB |
| 5 | Oridorsalis umbonatus, δ18O | O. umbonatus δ18O | ‰ PDB | Creac'h, Layla | Isotope ratio mass spectrometer (IRMS), Thermo Fisher, MAT253 | vs. VPDB |
| 6 | Oridorsalis umbonatus, Magnesium/Calcium ratio | O. umbonatus Mg/Ca | mmol/mol | Creac'h, Layla | Inductively coupled plasma optical emission spectrometer (ICP-OES), Agilent 720 |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1650 data points