Molina, Giulia Silveira; Pena, Leopoldo D: U/Mn ratios on planktic foraminifera for the Marine Isotope Stage (MIS) 18 to MIS 32 interval of IODP Site 339-U1387, Gulf of Cadiz [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.996413 (dataset in review), In: Molina, Giulia Silveira; Andersen, Nils; Pena, Leopoldo D; Ogretmen, Nazik; Voelker, Antje H L: Multi-proxy record of upper Mediterranean Outflow Water oxygenation variability during the Early to Middle Pleistocene (Marine Isotope Stages 17 to 32, and MIS 51) of IODP Site U1387, Gulf of Cadiz [dataset bundled publication]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.996410 (dataset in review)
Abstract:
This dataset contains uranium/manganese (U/Mn) ratios measured on authigenic iron–manganese (Fe–Mn) oxide coatings of planktic foraminifera from IODP Site U1387 (36°48.32′N, 07°43.13′W; 559 m water depth), on the middle slope of the Faro Drift in the Gulf of Cadiz. The ratios were measured to obtain a chemical, redox-sensitive check on bottom-water oxygenation across Marine Isotope Stages (MIS) 18 to 32, in the Early to Middle Pleistocene, independent of the foraminiferal fauna. The cleaned samples were dissolved in ultra-pure 2 % nitric acid and analysed on an Agilent 7500ce inductively coupled plasma mass spectrometer (ICP-MS) at the Scientific and Technological Centres of the University of Barcelona (CCiT-UB), Spain. Uranium is enriched under reducing conditions whereas manganese precipitates under oxic conditions, so a higher U/Mn ratio reflects lower bottom-water oxygen (Gottschalk et al., 2016; Hu et al., 2023). The age model is based on correlation of the planktonic d18O record of Globigerina bulloides from Site U1387 to IODP Site U1385, which is aligned to the LR04 benthic isotope stack (Lisiecki and Raymo, 2005). Ages are also given on the Probstack time scale (Ahn et al., 2017). Being a qualitative proxy, the ratios track the direction of oxygenation change rather than an absolute oxygen concentration.
Keyword(s):
References:
Ahn, Seonmin; Khider, D; Lisiecki, Lorraine E; Lawrence, Charles E (2017): A probabilistic Pliocene–Pleistocene stack of benthic δ18O using a profile hidden Markov model. Dynamics and Statistics of the Climate System, 2(1), https://doi.org/10.1093/climsys/dzx002
Gottschalk, Julia; Skinner, Luke C; Lippold, Jörg; Vogel, Hendrik; Frank, Norbert; Jaccard, Samuel L; Waelbroeck, Claire (2016): Biological and physical controls in the Southern Ocean on past millennial-scale atmospheric CO2 changes. Nature Communications, 7(11539), https://doi.org/10.1038/ncomms11539
Hu, Rong; Bostock, Helen C; Gottschalk, Julia; Piotrowski, Alexander M (2023): Reconstructing ocean oxygenation changes from U/Ca and U/Mn in foraminiferal coatings: Proxy validation and constraints on glacial oxygenation changes. Quaternary Science Reviews, 306, 108028, https://doi.org/10.1016/j.quascirev.2023.108028
Lisiecki, Lorraine E; Raymo, Maureen E (2005): LR04 Global Pliocene-Pleistocene benthic d18O stack [dataset]. NOAA National Centers for Environmental Information, https://doi.org/10.25921/K88J-0106
Funding:
Fundação para a Ciência e Tecnologia (FCT), grant/award no. 2021.06553.BD: Impacts of early to middle Pleistocene climate change on the sea floor environment of the Gulf of Cadiz – evidence from benthic foraminifera
Coverage:
Median Latitude: 36.805410 * Median Longitude: -7.718905 * South-bound Latitude: 36.805410 * West-bound Longitude: -7.719013 * North-bound Latitude: 36.805410 * East-bound Longitude: -7.718797
Minimum Elevation: -558.7 m * Maximum Elevation: -558.2 m
Event(s):
339-U1387A * Latitude: 36.805410 * Longitude: -7.719013 * Elevation: -558.7 m * Recovery: 347.84 m * Campaign: Exp339 (Mediterranean Outflow) * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 38 cores; 352.4 m cored; 99 % recovered; 352.4 m penetrated
339-U1387B * Latitude: 36.805410 * Longitude: -7.718797 * Elevation: -558.2 m * Recovery: 327.61 m * Campaign: Exp339 (Mediterranean Outflow) * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 36 cores; 338.3 m cored; 97 % recovered; 338.3 m penetrated
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Molina, Giulia Silveira | |||
| 2 | Sample code/label | Sample label | Molina, Giulia Silveira | DSDP/ODP/IODP sample designation | ||
| 3 | Depth, sediment/rock, top/minimum | Depth sed top | m | Molina, Giulia Silveira | mbsf | |
| 4 | Depth, composite top | Depth comp top | mcd | Molina, Giulia Silveira | Intercore correlation | |
| 5 | Depth, composite, corrected, top | Depth comp corr top | c-mcd | Molina, Giulia Silveira | Intercore correlation | |
| 6 | AGE | Age | ka BP | Molina, Giulia Silveira | Age model according to Lisiecki & Raymo (2005) [LR04] | Geocode |
| 7 | AGE | Age | ka BP | Molina, Giulia Silveira | Age model according to Ahn et al. (2017) [Probstack] | Geocode |
| 8 | Uranium-238/Manganese-55 ratio | 238U/55Mn | µmol/mol | Molina, Giulia Silveira | Corrected | multi-species planktic foraminifera, >250 m fraction; 40-60 tests per sample |
| 9 | Uranium-238/Manganese-55 ratio, standard deviation | 238U/55Mn std dev | ± | Molina, Giulia Silveira | ||
| 10 | Uranium-238/Manganese-55 ratio, standard deviation, relative | 238U/55Mn std dev | % | Molina, Giulia Silveira |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
658 data points