Peral, Marion; Caley, Thibaut; Malaizé, Bruno; Barathieu, Héloïse; Dassié, Émilie: Low resolution Mg/Ca on planktonic foraminiferal calcite from MD96-2048 (Pleistocene) - T. sacculifer [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.983363 (dataset in review)
Abstract:
This study was conducted to evaluate discrepancies between SST proxies and to assess their sensitivity to oceanographic changes. These data contribute to improved proxy interpretation, particularly for paleoceanographic reconstructions in subtropical ocean settings. This dataset provides sea surface temperature (SST) reconstructions over the past 1.25 million years from sediment core MD96-2048, collected at 660 m water depth near Delagoa Bight in the southwestern Indian Ocean (26°10.482′S, 34°01.148′E) during the Marion Dufresne MD104 cruise. The dataset includes Mg/Ca ratios geochemical records from planktonic foraminifera, presented at low resolutions (10 datapoints). Mg/Ca analyses were conducted on Trilobatus sacculifer (new data presented here), and compared with Mg/Ca on Globigerinoides ruber (published by Caley et al., 2011; doi:10.5194/cp-7-1285-2011) using inductively coupled plasma optical emission spectrometry (ICP-OES). Clumped isotope measurements were performed on G. ruber and are available in the EarthChem dataset. The age model is based on benthic foraminiferal δ¹⁸O stratigraphy from the same core (Caley et al., 2011, doi:10.5194/cp-7-1285-2011). The dataset spans the Quaternary period, with temporal coverage from 0 to 1.25 million years before present. Sampling resolution for Mg/Ca of T. sacculifer is very low (10 datapoints over the last 1.25 Ma), allowing for investigation of differences between Mg/Ca and clumped isotopes.
SSTs were primarily calculated using the T. sacculifer Mg/Ca–temperature calibration from Anand et al. (2003, doi:10.1029/2002PA000846), applying the equation with the constant A assumed for this morphotype (with sac). To account for salinity-related biases in Mg/Ca, calibration adjustments based on Gray and Evans (2019, doi:10.1029/2018PA003517) were also incorporated. Data are provided as tabulated time series of raw geochemical measurements and calculated SST estimates.
Supplement to:
Peral, Marion; Caley, Thibaut; Malaizé, Bruno; Extier, Thomas; Rossignol, Linda; Barathieu, Héloïse; Dassié, Émilie; Bassinot, Franck; Blamart, Dominique; Daëron, Mathieu (in review): Understanding the relationship between foraminiferal Mg/Ca and clumped isotope thermometers. Geochimica et Cosmochimica Acta
References:
Anand, Pallavi; Elderfield, Henry; Conte, Maureen H (2003): Calibration of Mg/Ca thermometry in planktonic foraminifera from a sediment trap time series. Paleoceanography, 18(2), 1050, https://doi.org/10.1029/2002PA000846
Caley, Thibaut; Kim, Ji-Hoon; Malaizé, Bruno; Giraudeau, Jacques; Laepple, Thomas; Caillon, Nicolas; Charlier, Karine; Rebaubier, Hélène; Rossignol, Pascale E; Castañeda, Isla S; Schouten, Stefan; Sinninghe Damsté, Jaap S (2011): High-latitude obliquity as a dominant forcing in the Agulhas current system. Climate of the Past, 7(4), 1285-1296, https://doi.org/10.5194/cp-7-1285-2011
Gray, William Robert; Evans, David (2019): Nonthermal Influences on Mg/Ca in Planktonic Foraminifera: A Review of Culture Studies and Application to the Last Glacial Maximum. Paleoceanography and Paleoclimatology, 34(3), 306-315, https://doi.org/10.1029/2018PA003517
Coverage:
Latitude: -26.166700 * Longitude: 34.016700
Minimum DEPTH, sediment/rock: 0.00 m * Maximum DEPTH, sediment/rock: 20.50 m
Event(s):
MD96-2048 * Latitude: -26.166700 * Longitude: 34.016700 * Elevation: -660.0 m * Campaign: MD104 (PEGASE) * Basis: Marion Dufresne (1995) * Method/Device: Calypso Corer (CALYPSO)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Peral, Marion | Geocode | |
| 2 | Age | Age | Ma | Peral, Marion | ||
| 3 | Magnesium/Calcium ratio | Mg/Ca | Peral, Marion | According to Caley et al. (2011) | ||
| 4 | Temperature, water | Temp | °C | Peral, Marion | Calculated, according to Anand et al. (2003) | For T. sacculifer with sac - A not assumed |
| 5 | Temperature, water, standard deviation | Temp std dev | ± | Peral, Marion | Calculated, according to Anand et al. (2003) | |
| 6 | Temperature, water | Temp | °C | Peral, Marion | Calculated, according to Gray and Evans (2019) | T. sacculifer equation |
| 7 | Temperature, water, standard deviation | Temp std dev | ± | Peral, Marion | Calculated, according to Gray and Evans (2019) |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Size:
60 data points