Raitzsch, Markus; Kuhnert, Henning; Groeneveld, Jeroen; Bickert, Torsten (2008): Magnesium/Calcium ratios in benthic foraminifera from surface sediments [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.759564, Supplement to: Raitzsch, M et al. (2008): Benthic foraminifer Mg/Ca anomalies in South Atlantic core top sediments and their implications for paleothermometry. Geochemistry, Geophysics, Geosystems, 9(5), Q05010, https://doi.org/10.1029/2007GC001788
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Abstract:
We used modern epibenthic foraminifer tests of Cibicidoides mundulus and Planulina wuellerstorfi from South Atlantic core top sediments in order to establish Mg/Ca-temperature relationships for the temperature range from 0 to 15°C. We obtained the following calibrations: Mg/Ca (mmol/mol) = 0.830*exp(0.145*BWT (°C)) for P. wuellerstorfi, and Mg/Ca (mmol/mol) = 0.627*exp(0.143*BWT (°C)) for C. mundulus. However, a number of tests, especially those bathed in North Atlantic Deep Water, revealed higher Mg/Ca ratios than predicted from the calibration. Our data suggest that d[CO3 2-] of bottom water exerts a significant control on dMg/Ca (temperature-corrected) of C. mundulus (dMg/Ca = 0.017*d[CO3 2-] -0.14), while dMg/Ca of P. wuellerstorfi is more likely to be governed by TCO2 (dMg/Ca = -0.007*TCO2 + 15). Since both d[CO3 2-] and TCO2 are closely linked to [CO3 2-], it is inferred that carbonate ion acts as secondary control, after temperature, on benthic shell Mg/Ca below -4°C. A drop in [CO3 2-] by 25 ?mol/kg at 4 km water depth, as suggested for the Last Glacial Maximum, would decrease Mg/Ca by up to 0.4 mmol/mol, which leads to an underestimation of bottom water temperature by -3.5°C. Therefore our results indicate that the Mg/Ca thermometer should be used cautiously for benthic foraminifers where changes in the carbonate chemistry are present in the paleoceanographic record.
Project(s):
Funding:
German Research Foundation (DFG), grant/award no. 5472008: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
Coverage:
Median Latitude: -28.834968 * Median Longitude: -19.330520 * South-bound Latitude: -48.013333 * West-bound Longitude: -58.518200 * North-bound Latitude: -1.665000 * East-bound Longitude: 17.755000
Date/Time Start: 1988-03-12T00:00:00 * Date/Time End: 2003-02-27T00:00:00
Minimum DEPTH, sediment/rock: 0.005 m * Maximum DEPTH, sediment/rock: 0.005 m
Event(s):
GeoB1041-1 * Latitude: -3.480000 * Longitude: -7.591667 * Date/Time: 1988-03-12T00:00:00 * Elevation: -4035.0 m * Penetration: 0.42 m * Location: Walvis Ridge * Campaign: M6/6 * Basis: Meteor (1986) * Method/Device: Giant box corer (GKG) * Comment: Karb.-schl., Forams
GeoB1105-3 * Latitude: -1.665000 * Longitude: -12.428330 * Date/Time: 1989-02-25T00:00:00 * Elevation: -3231.0 m * Penetration: 0.36 m * Recovery: 0.32 m * Location: Equatorial Atlantic * Campaign: M9/4 * Basis: Meteor (1986) * Method/Device: Giant box corer (GKG) * Comment: Karbonatschlamm
GeoB1113-7 * Latitude: -5.745000 * Longitude: -11.035000 * Date/Time: 1989-03-02T00:00:00 * Elevation: -2373.0 m * Penetration: 0.35 m * Recovery: 0.25 m * Location: Equatorial Atlantic * Campaign: M9/4 * Basis: Meteor (1986) * Method/Device: Giant box corer (GKG) * Comment: Foram.-sand, tonig
Parameter(s):
# | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
---|---|---|---|---|---|---|
1 | Event label | Event | ||||
2 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
3 | Depth, top/min | Depth top | m | |||
4 | Depth, bottom/max | Depth bot | m | |||
5 | Planulina wuellerstorfi, Magnesium/Calcium ratio | P. wuellerstorfi Mg/Ca | mmol/mol | Raitzsch, Markus | LA-ICP-MS Thermo Finnigan Element 2 | |
6 | Planulina wuellerstorfi, Magnesium/Calcium ratio, standard deviation | P. wuellerstorfi Mg/Ca std dev | ± | Raitzsch, Markus | ||
7 | Cibicidoides mundulus, Magnesium/Calcium ratio | C. mundulus Mg/Ca | mmol/mol | Raitzsch, Markus | LA-ICP-MS Thermo Finnigan Element 2 | |
8 | Cibicidoides mundulus, Magnesium/Calcium ratio, standard deviation | C. mundulus Mg/Ca std dev | ± | Raitzsch, Markus |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
246 data points
Data
1 Event | 2 Depth sed [m] | 3 Depth top [m] | 4 Depth bot [m] | 5 P. wuellerstorfi Mg/Ca [mmol/mol] | 6 P. wuellerstorfi Mg/Ca std dev [±] | 7 C. mundulus Mg/Ca [mmol/mol] | 8 C. mundulus Mg/Ca std dev [±] |
---|---|---|---|---|---|---|---|
GeoB1041-1 | 0.005 | 0.000 | 0.010 | 1.57 | 0.17 | ||
GeoB1105-3 | 0.005 | 0.000 | 0.010 | 1.73 | 0.33 | ||
GeoB1113-7 | 0.005 | 0.000 | 0.010 | 1.74 | 0.68 | ||
GeoB1118-2 | 0.005 | 0.000 | 0.010 | 0.99 | 0.27 | ||
GeoB1203-2 | 0.005 | 0.000 | 0.010 | 1.44 | 0.48 | ||
GeoB1216-2 | 0.005 | 0.000 | 0.010 | 1.38 | 0.27 | 1.70 | 0.51 |
GeoB1217-1 | 0.005 | 0.000 | 0.010 | 1.33 | 0.35 | 1.42 | 0.44 |
GeoB1218-1 | 0.005 | 0.000 | 0.010 | 1.72 | 0.64 | 1.78 | 0.34 |
GeoB1707-2 | 0.005 | 0.000 | 0.010 | 1.51 | 0.20 | ||
GeoB1710-2 | 0.005 | 0.000 | 0.010 | 1.50 | 0.34 | 1.25 | 0.25 |
GeoB1711-5 | 0.005 | 0.000 | 0.010 | 1.20 | 0.22 | 1.06 | 0.20 |
GeoB1712-2 | 0.005 | 0.000 | 0.010 | 1.50 | 0.30 | 1.12 | 0.16 |
GeoB1713-6 | 0.005 | 0.000 | 0.010 | 1.21 | 0.23 | ||
GeoB1715-3 | 0.005 | 0.000 | 0.010 | 1.08 | 0.36 | ||
GeoB1719-2 | 0.005 | 0.000 | 0.010 | 1.34 | 0.44 | ||
GeoB1720-4 | 0.005 | 0.000 | 0.010 | 1.42 | 0.28 | ||
GeoB1721-5 | 0.005 | 0.000 | 0.010 | 1.79 | 0.43 | ||
GeoB1726-2 | 0.005 | 0.000 | 0.010 | 1.87 | 0.47 | 1.75 | 0.36 |
GeoB1728-3 | 0.005 | 0.000 | 0.010 | 1.74 | 0.27 | 1.70 | 0.33 |
GeoB1729-2 | 0.005 | 0.000 | 0.010 | 1.49 | 0.32 | 1.16 | 0.40 |
GeoB2102-1 | 0.005 | 0.000 | 0.010 | 1.98 | 0.38 | ||
GeoB2105-3 | 0.005 | 0.000 | 0.010 | 5.47 | 0.47 | ||
GeoB2106-1 | 0.005 | 0.000 | 0.010 | 1.88 | 0.47 | ||
GeoB2107-5 | 0.005 | 0.000 | 0.010 | 1.48 | 0.36 | 1.10 | 0.64 |
GeoB2715-1 | 0.005 | 0.000 | 0.010 | 1.02 | 0.26 | ||
GeoB2718-2 | 0.005 | 0.000 | 0.010 | 0.94 | 0.23 | 0.91 | 0.28 |
GeoB2727-1 | 0.005 | 0.000 | 0.010 | 1.04 | 0.29 | ||
GeoB3602-2 | 0.005 | 0.000 | 0.010 | 1.16 | 0.27 | ||
GeoB3603-1 | 0.005 | 0.000 | 0.010 | 1.28 | 0.46 | 1.55 | 0.41 |
GeoB3803-1 | 0.005 | 0.000 | 0.010 | 1.30 | 0.46 | 1.21 | 0.23 |
GeoB3804-2 | 0.005 | 0.000 | 0.010 | 1.54 | 0.46 | 1.65 | 0.58 |
GeoB3807-1 | 0.005 | 0.000 | 0.010 | 2.01 | 0.63 | ||
GeoB3808-7 | 0.005 | 0.000 | 0.010 | 1.58 | 0.43 | 1.62 | 0.55 |
GeoB3809-1 | 0.005 | 0.000 | 0.010 | 1.73 | 0.57 | 1.52 | 0.45 |
GeoB3810-2 | 0.005 | 0.000 | 0.010 | 1.76 | 0.77 | ||
GeoB3812-2 | 0.005 | 0.000 | 0.010 | 1.40 | 0.42 | 0.95 | 0.49 |
GeoB3822-1 | 0.005 | 0.000 | 0.010 | 0.84 | 0.31 | 0.52 | 0.10 |
GeoB3827-1 | 0.005 | 0.000 | 0.010 | 1.37 | 0.21 | 0.71 | 0.25 |
GeoB6202-5 | 0.005 | 0.000 | 0.010 | 1.55 | 0.66 | 1.60 | 0.43 |
GeoB6205-1 | 0.005 | 0.000 | 0.010 | 1.43 | 0.38 | 1.70 | 0.44 |
GeoB6208-1 | 0.005 | 0.000 | 0.010 | 0.84 | 0.33 | ||
GeoB6216-1 | 0.005 | 0.000 | 0.010 | 1.55 | 0.22 | ||
GeoB6222-2 | 0.005 | 0.000 | 0.010 | 1.23 | 0.43 | ||
GeoB6309-2 | 0.005 | 0.000 | 0.010 | 1.15 | 0.42 | 0.95 | 0.25 |
GeoB6330-1 | 0.005 | 0.000 | 0.010 | 0.95 | 0.22 | ||
GeoB6334-2 | 0.005 | 0.000 | 0.010 | 1.27 | 0.49 | 1.12 | 0.20 |
GeoB6336-2 | 0.005 | 0.000 | 0.010 | 1.17 | 0.24 | ||
GeoB8403-1 | 0.005 | 0.000 | 0.010 | 3.12 | 1.49 | ||
GeoB8430-2 | 0.005 | 0.000 | 0.010 | 2.02 | 0.50 | ||
GeoB8462-4 | 0.005 | 0.000 | 0.010 | 1.07 | 0.25 |