Stainbank, Stephanie; Spezzaferri, Silvia; De Boever, Eva; Bouvier, Anne-Sophie; Chilcott, Colin; de Leau, Erica S; Foubert, Anneleen; Kunkelova, Tereza; Pichevin, Laetitia; Raddatz, Jacek; Rüggeberg, Andres; Wright, James D; Yu, Siyao M; Zhang, Manlin; Kroon, Dick (2022): Long-term, high-resolution foraminiferal geochemical records (δ¹⁸O, δ¹³C) from IODP Site 359-U1467 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.939911
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Abstract:
Due to their large heat and moisture storage capabilities, the tropics are fundamental in modulating both regional and global climate. Furthermore, their thermal response during past extreme warming periods, such as super interglacials, is not fully resolved. In this regard, we present high-resolution (analytical) foraminiferal geochemical (δ^18^O and Mg/Ca) records for the last 1800 kyr from the shallow (487 m) Inner Sea drift deposits of the Maldives archipelago in the equatorial Indian Ocean. Considering the diagenetic susceptibility of these proxies, in carbonate-rich environments, we assess the integrity of a suite of commonly used planktonic and benthic foraminifera geochemical datasets (Globigerinoides ruber (white), Globigerinita glutinata (with bulla), Pulleniatina obliquiloculata (with cortex) and Cibicides mabahethi) and their use for future paleoceanographic reconstructions.
Using a combination of spot Secondary Ion Mass Spectrometer, Electron Probe Micro-Analyzer and Scanning Electron Microscope image data, it is evident that authigenic overgrowths are present on both the external and internal test (shell) surfaces, yet the degree down-core as well as the associated bias is shown to be variable across the investigated species and proxies. Given the elevated authigenic overgrowth Mg/Ca (∼12–22 mmol/mol) and δ^18^O values (closer to the benthic isotopic compositions) the whole-test planktonic G. ruber (w) geochemical records are notably impacted beyond ∼627.4 ka (24.7 mcd). Yet, considering the setting (i.e. bottom water location) for overgrowth formation, the benthic foraminifera δ^18^O record is markedly less impacted with only minor diagenetic bias beyond ∼790.0 ka (28.7 mcd). Even though only the top of the G. ruber (w) and C. mabahethi records (whole-test data) would be suitable for paleo-reconstructions of absolute values (i.e. sea surface temperature, salinity, seawater δ^18^O), the long-term cycles, while dampened, appear to be preserved. Furthermore, planktonic species with thicker-tests (i.e. P. obliquiloculata (w/c)) might be better suited, in comparison to thinner-test counter-parts (i.e. G. glutinata (w/b), G. ruber (w)), for traditional whole-test geochemical studies in shallow, carbonate-rich environments. A thicker test equates to a smaller overall bias from the authigenic overgrowth. Overall, if the diagenetic impact is constrained, as done in this study, these types of diagenetically altered geochemical records can still significantly contribute to studies relating to past tropical seawater temperatures, latitudinal scale ocean current shifts and South Asian Monsoon dynamics.
Supplement to:
Stainbank, Stephanie; Spezzaferri, Silvia; De Boever, Eva; Bouvier, Anne-Sophie; Chilcott, Colin; de Leau, Erica S; Foubert, Anneleen; Kunkelova, Tereza; Pichevin, Laetitia; Raddatz, Jacek; Rüggeberg, Andres; Wright, James D; Yu, Siyao M; Zhang, Manlin; Kroon, Dick (2020): Assessing the impact of diagenesis on foraminiferal geochemistry from a low latitude, shallow-water drift deposit. Earth and Planetary Science Letters, 545, 116390, https://doi.org/10.1016/j.epsl.2020.116390
Related to:
Stainbank, Stephanie; Spezzaferri, Silvia; De Boever, Eva; Bouvier, Anne-Sophie; Chilcott, Colin; de Leau, Erica S; Foubert, Anneleen; Kunkelova, Tereza; Pichevin, Laetitia; Raddatz, Jacek; Rüggeberg, Andres; Wright, James D; Yu, Siyao M; Zhang, Manlin; Kroon, Dick (2020): Long-term, high-resolution foraminiferal geochemical records (element/Ca) from IODP Site 359-U1467. PANGAEA, https://doi.org/10.1594/PANGAEA.914882
Stainbank, Stephanie; Spezzaferri, Silvia; Kroon, Dick; de Leau, Erica S; Rüggeberg, Andres (2018): The Planktonic foraminifera Globigerinoides eoconglobatus n. sp. in a glacial–interglacial context: IODP359 Sites U1467 and U1468. Swiss Journal of Geosciences, 111(3), 511-522, https://doi.org/10.1007/s00015-018-0304-9
Original version:
Stainbank, Stephanie; Spezzaferri, Silvia; De Boever, Eva; Bouvier, Anne-Sophie; Chilcott, Colin; de Leau, Erica S; Foubert, Anneleen; Kunkelova, Tereza; Pichevin, Laetitia; Raddatz, Jacek; Rüggeberg, Andres; Wright, James D; Yu, Siyao M; Zhang, Manlin; Kroon, Dick (2020): Long-term, high-resolution foraminiferal geochemical records (δ¹⁸O, δ¹³C) from IODP Site 359-U1467. PANGAEA, https://doi.org/10.1594/PANGAEA.914883
Coverage:
Median Latitude: 4.850514 * Median Longitude: 73.283668 * South-bound Latitude: 4.850425 * West-bound Longitude: 73.283662 * North-bound Latitude: 4.850603 * East-bound Longitude: 73.283673
Date/Time Start: 2015-10-29T04:00:00 * Date/Time End: 2015-11-03T19:10:00
Minimum Elevation: -487.5 m * Maximum Elevation: -487.2 m
Event(s):
359-U1467B * Latitude: 4.850425 * Longitude: 73.283673 * Date/Time Start: 2015-10-29T04:00:00 * Date/Time End: 2015-11-01T06:05:00 * Elevation: -487.5 m * Penetration: 617.2 m * Recovery: 560.39 m * Campaign: Exp359 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: Cored interval 617.2 m, Recover 91 %, Offsetz 20 m north of Hole U1467A
359-U1467C * Latitude: 4.850603 * Longitude: 73.283662 * Date/Time Start: 2015-11-01T06:05:00 * Date/Time End: 2015-11-03T19:10:00 * Elevation: -487.2 m * Penetration: 714.0 m * Recovery: 266.15 m * Campaign: Exp359 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: Cored interval 332.1 m, Recover 80 %, Offsetz 20 m north of Hole U1467B
Comment:
Version 2, 2022-01-10: Previous version doi:10.1594/PANGAEA.914883.The new version includes updated Core 359-U1467C-1H-2 sample labels.
Parameter(s):
# | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
---|---|---|---|---|---|---|
1 | Event label | Event | Stainbank, Stephanie | |||
2 | AGE | Age | ka BP | Stainbank, Stephanie | Geocode | |
3 | Depth, composite | Depth comp | mcd | Stainbank, Stephanie | ||
4 | Sample code/label | Sample label | Stainbank, Stephanie | DSDP/ODP/IODP sample designation | ||
5 | Globigerinoides ruber white, δ13C | G. ruber w δ13C | ‰ PDB | Stainbank, Stephanie | Mass spectrometer (MSPEC) | Size fraction: 212-250 µm |
6 | Globigerinoides ruber white, δ18O | G. ruber w δ18O | ‰ PDB | Stainbank, Stephanie | Mass spectrometer (MSPEC) | Size fraction: 212-250 µm |
7 | Sample comment | Sample comment | Stainbank, Stephanie | Comment/Reference | ||
8 | Pulleniatina obliquiloculata, δ13C | P. obliquiloculata δ13C | ‰ PDB | Stainbank, Stephanie | Mass spectrometer (MSPEC) | With cortex; size fraction: 355-400 µm |
9 | Pulleniatina obliquiloculata, δ18O | P. obliquiloculata δ18O | ‰ PDB | Stainbank, Stephanie | Mass spectrometer (MSPEC) | With cortex; size fraction: 355-400 µm |
10 | Globigerinita glutinata, δ13C | G. glutinata δ13C | ‰ PDB | Stainbank, Stephanie | Mass spectrometer (MSPEC) | With bulla; size fraction: 125-150 µm |
11 | Globigerinita glutinata, δ18O | G. glutinata δ18O | ‰ PDB | Stainbank, Stephanie | Mass spectrometer (MSPEC) | With bulla; size fraction: 125-150 µm |
12 | Cibicides mabahethi, δ13C | C. mabahethi δ13C | ‰ PDB | Stainbank, Stephanie | Mass spectrometer (MSPEC) | Size fraction: >180 µm |
13 | Cibicides mabahethi, δ18O | C. mabahethi δ18O | ‰ PDB | Stainbank, Stephanie | Mass spectrometer (MSPEC) | Size fraction: >180 µm |
14 | Sample comment | Sample comment | Stainbank, Stephanie | Comment/Reference |
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Creative Commons Attribution 4.0 International (CC-BY-4.0)
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11221 data points
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