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Lear, Caroline H; Mawbey, Elaine M; Rosenthal, Yair (2010): (Table S3) Benthic foraminiferal Mg/Ca, Li/Ca and stable isotope ratios of ODP Site 122-761 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.831022, Supplement to: Lear, CH et al. (2010): Cenozoic benthic foraminiferal Mg/Ca and Li/Ca records: Toward unlocking temperatures and saturation states. Paleoceanography, 25(4), PA4215, https://doi.org/10.1029/2009PA001880

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Abstract:
The sensitivities of benthic foraminiferal Mg/Ca and Li/Ca to bottom water temperature and carbonate saturation state have recently been assessed. Here we present a new approach that uses paired Mg/Ca and Li/Ca records to calculate simultaneous changes in temperature and saturation state. Using previously published records, we first use this approach to document a cooling of deep ocean waters associated with the establishment of the Antarctic ice sheet at the Eocene-Oligocene climate transition. We then apply this approach to new records of the Middle Miocene Climate Transition from ODP Site 761 to estimate variations in bottom water temperature and the oxygen isotopic composition of seawater. We estimate that the oxygen isotopic composition of seawater varied by ~1 per mil between the deglacial extreme of the Miocene Climatic Optimum and the glacial maximum following the Middle Miocene Climate Transition, indicating large amplitude variations in ice volume. However, the longer-term change between 15.3 and 12.5 Ma is marked by a ~1°C cooling of deep waters, and an increase in the oxygen isotopic composition of seawater of ~0.6 per mil. We find that bottom water saturation state increased in the lead up to the Middle Miocene Climate Transition and decreased shortly after. This supports decreasing pCO2 as a driver for global cooling and ice sheet expansion, in agreement with existing boron isotope and leaf stomatal index CO2 records but in contrast to the published alkenone CO2 records.
Further details:
Bryan, Sean P; Marchitto, Thomas M (2010): Mg/Ca-temperature proxy in benthic foraminifera from the Florida Strait. PANGAEA, https://doi.org/10.1594/PANGAEA.831060
Lear, Caroline H; Rosenthal, Yair; Slowey, Niall C (2002): Benthic foraminiferal Mg/Ca ratios. PANGAEA, https://doi.org/10.1594/PANGAEA.831131
Project(s):
Coverage:
Latitude: -16.737333 * Longitude: 115.535000
Date/Time Start: 1988-07-19T00:00:00 * Date/Time End: 1988-07-25T00:00:00
Minimum Elevation: -2179.0 m * Maximum Elevation: -2179.0 m
Event(s):
122-761 * Latitude: -16.737333 * Longitude: 115.535000 * Date/Time Start: 1988-07-19T00:00:00 * Date/Time End: 1988-07-25T00:00:00 * Elevation: -2179.0 m * Penetration: 732.9 m * Recovery: 281.2 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg122 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 67 cores; 732.9 m cored; 0 m drilled; 38.4% recovery
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
AGEAgeka BPGeocode
Oridorsalis umbonatus, Lithium/Calcium ratioO. umbonatus Li/Caµmol/molLear, Caroline HInductively coupled plasma - mass spectrometry (ICP-MS)size fraction 250-355 µm
Oridorsalis umbonatus, Magnesium/Calcium ratioO. umbonatus Mg/Cammol/molLear, Caroline HInductively coupled plasma - mass spectrometry (ICP-MS)size fraction 250-355 µm
Oridorsalis umbonatus, Lithium/Calcium ratioO. umbonatus Li/Caµmol/molLear, Caroline HCalculated moving averages5 point
Oridorsalis umbonatus, Magnesium/Calcium ratioO. umbonatus Mg/Cammol/molLear, Caroline HCalculated moving averages5 point
Size fraction > 0.063 mm, sand>63 µm%Lear, Caroline HGrain size, sieving
Size fraction > 0.063 mm, sand>63 µm%Lear, Caroline HCalculated moving averages5 point
Δ carbonate ion contentΔ[CO3]2-µmol/kgLear, Caroline HCalculatedassuming D[CO3]2- at 16.975 Ma = 0 µmol/kg using 'corrected' BWT
Δ carbonate ion contentΔ[CO3]2-µmol/kgLear, Caroline HCalculatedassuming D[CO3]2- at 16.975 Ma = 0 µmol/kg using 'uncorrected' BWT
10 Bottom water temperatureBWT°CLear, Caroline HCalculatedassuming BWT at 16.975 Ma = 10.25
11 Bottom water temperatureBWT°CLear, Caroline HCalculatedassuming no saturation correction necessary (above threshold)
12 Cibicidoides mundulus, δ18OC. mundulus δ18O‰ PDBLear, Caroline HMass spectrometer Finnigan MAT 252unadjusted, size fraction 250-355 µm
13 Cibicidoides mundulus, δ18OC. mundulus δ18O‰ PDBLear, Caroline HCalculated moving averages5 point, undajusted
14 Cibicidoides mundulus, δ13CC. mundulus δ13C‰ PDBLear, Caroline HMass spectrometer Finnigan MAT 252unadjusted, size fraction 250-355 µm
15 Cibicidoides mundulus, δ13CC. mundulus δ13C‰ PDBLear, Caroline HCalculated moving averages5 point, undajusted
16 δ18Oδ18OLear, Caroline Hwith respect to PDB, seawater, using corrected BWT
17 δ18Oδ18OLear, Caroline Hwith respect to PDB, seawater, using uncorrected BWT
Size:
2998 data points

Data

Download dataset as tab-delimited text — use the following character encoding:


Age [ka BP]

O. umbonatus Li/Ca [µmol/mol]
(size fraction 250-355 µm, Ind...)

O. umbonatus Mg/Ca [mmol/mol]
(size fraction 250-355 µm, Ind...)

O. umbonatus Li/Ca [µmol/mol]
(5 point, Calculated moving av...)

O. umbonatus Mg/Ca [mmol/mol]
(5 point, Calculated moving av...)

>63 µm [%]
(Grain size, sieving)

>63 µm [%]
(5 point, Calculated moving av...)

Δ[CO3]2- [µmol/kg]
(assuming D[CO3]2- at 16.975 M...)

Δ[CO3]2- [µmol/kg]
(assuming D[CO3]2- at 16.975 M...)
10 
BWT [°C]
(assuming BWT at 16.975 Ma = 1...)
11 
BWT [°C]
(assuming no saturation correc...)
12 
C. mundulus δ18O [‰ PDB]
(unadjusted, size fraction 250...)
13 
C. mundulus δ18O [‰ PDB]
(5 point, undajusted, Calculat...)
14 
C. mundulus δ13C [‰ PDB]
(unadjusted, size fraction 250...)
15 
C. mundulus δ13C [‰ PDB]
(5 point, undajusted, Calculat...)
16 
δ18O []
(with respect to PDB, seawater...)
17 
δ18O []
(with respect to PDB, seawater...)
1716214.72.58311.420.95
1697513.72.60330.00.010.310.31.341.380.310.31
1669314.62.7414.12.553334-5.4-11.810.39.91.501.430.861.000.290.19
1668514.22.3813.72.543434-10.6-22.810.69.91.561.440.891.030.370.18
1666613.52.4613.62.513635-13.8-29.710.59.51.361.450.940.910.360.11
1664712.32.5413.42.473235-18.2-39.310.69.21.461.361.100.940.28-0.06
1659113.32.4113.22.493935-18.5-39.910.89.41.391.320.780.930.29-0.05
1646713.52.5613.42.493634-16.4-35.310.69.41.051.331.010.960.26-0.04
1643313.42.4813.82.563134-7.7-16.610.610.01.361.330.810.970.250.11
1641614.52.4713.82.553333-9.1-19.610.69.91.371.321.091.060.240.08
1640614.42.9013.72.483032-13.7-29.710.49.41.481.341.181.110.21-0.05
1638213.02.3513.62.463232-16.0-34.710.49.21.331.371.211.160.23-0.06
1636613.32.2213.22.413231-23.2-50.110.58.71.161.381.251.200.27-0.16
1633312.82.3812.82.353029-30.8-66.510.58.21.491.341.091.210.23-0.33
1631712.52.2213.22.453129-21.5-46.410.69.01.421.331.281.210.26-0.13
1628612.62.5812.92.492127-22.0-47.311.09.41.291.401.221.180.420.01
1627014.62.8312.92.503025-20.8-44.611.09.51.301.371.221.220.410.03
1620811.92.4112.52.512525-23.9-51.211.39.61.481.321.121.150.42-0.01
1619312.92.4712.62.461827-25.7-55.311.19.21.371.251.281.080.28-0.19
1617810.72.2512.22.353127-37.0-79.810.98.21.161.230.901.070.23-0.45
1614813.12.3612.32.333027-37.5-81.010.88.00.921.170.881.040.14-0.55
1611912.42.2712.52.332929-36.0-77.710.68.01.201.151.191.050.08-0.58
1610412.22.3112.92.412729-26.8-57.910.78.71.191.160.961.110.11-0.39
1607513.92.4412.92.412929-26.3-56.810.78.71.261.201.331.200.14-0.34
1606112.72.6613.02.403128-25.8-55.710.68.71.251.211.191.260.12-0.35
1601813.22.3713.12.463027-21.1-45.510.79.11.121.181.361.350.12-0.27
1600413.02.2312.82.422327-26.8-57.810.88.81.231.131.461.350.10-0.39
1597612.92.5813.02.412325-25.2-54.510.68.71.031.111.401.360.03-0.44
1596212.12.2713.32.422524-21.7-46.910.48.81.041.061.361.33-0.06-0.46
1593413.82.6113.52.482323-16.2-34.910.59.31.111.071.211.32-0.03-0.33
1590714.62.4413.92.452422-13.8-30.010.19.00.911.121.211.31-0.09-0.34
1586614.12.5014.22.491921-7.9-17.410.09.41.281.191.441.34-0.03-0.18
1585215.02.4414.02.442021-13.8-30.110.08.91.261.251.321.440.02-0.24
1580713.72.4813.62.452120-16.8-36.310.39.01.411.331.501.530.17-0.14
1579912.62.3313.52.352221-24.5-53.310.08.21.371.351.721.570.13-0.32
1578512.92.4913.62.372120-21.8-47.410.08.31.321.361.651.620.12-0.28
1577213.22.0213.62.401920-20.7-45.110.18.61.381.421.671.670.22-0.16
1570515.92.5114.12.422020-14.4-31.59.98.81.301.451.581.660.18-0.09
1569213.32.6314.22.421919-12.4-27.29.78.81.701.391.751.630.10-0.14
1563915.12.4414.32.461918-9.9-21.79.99.11.521.411.631.660.15-0.04
1561313.82.5014.22.491518-7.8-17.110.09.41.051.471.511.680.250.10
1556013.22.2214.22.451917-10.5-23.09.99.11.451.411.831.620.15-0.05
1554115.82.6914.62.421516-8.4-18.89.58.81.601.391.671.610.03-0.13
1553313.32.4114.32.521617-5.7-12.410.19.61.441.471.441.590.260.16
1552017.02.2914.72.5916162.45.110.010.21.401.481.591.530.260.31
1550712.22.9914.52.551717-2.0-4.510.19.91.451.451.421.540.240.21
1548015.22.5514.82.5517161.52.99.89.91.491.441.521.610.170.19
1545414.62.5314.32.591616-1.0-2.210.310.31.441.421.721.570.290.27
1544015.12.4014.92.441616-4.4-10.19.38.91.401.451.791.640.05-0.04
1542714.62.4914.82.441616-5.0-11.49.49.01.341.451.421.690.08-0.02
1540815.22.2214.62.491816-4.5-10.09.89.41.591.431.731.620.150.06
1540014.72.5814.72.471517-4.6-10.49.69.31.501.401.801.560.08-0.01
1529113.42.7814.42.471417-8.4-18.59.89.21.301.401.351.560.13-0.03
1527815.62.3013.72.512018-11.9-25.610.59.61.251.311.481.470.20-0.02
1526413.02.4513.42.512019-15.5-33.410.79.61.351.261.461.380.22-0.06
1523612.02.4613.92.502020-10.9-23.610.39.51.131.271.281.390.13-0.07
1522212.82.5813.52.572120-10.7-22.810.910.11.291.291.331.400.280.09
1520815.92.7413.82.562020-8.6-18.510.610.01.331.311.381.420.240.08
1518013.72.6314.12.541919-6.8-14.810.39.81.331.391.531.510.240.12
1512414.42.3814.42.551819-3.3-7.210.29.91.461.391.571.550.200.14
1510913.72.3414.02.481919-11.3-24.510.19.31.561.381.711.600.19-0.02
1509514.22.6514.22.421919-13.1-28.69.88.81.251.391.551.590.10-0.14
1508114.22.3714.12.452021-12.6-27.410.09.01.321.381.631.590.14-0.09
1506614.62.3514.32.461922-9.3-20.59.89.11.351.341.471.520.08-0.10
1502313.72.5314.22.402724-14.1-30.99.78.61.411.341.591.470.03-0.24
1497814.92.4014.02.392625-16.3-35.79.88.51.391.331.381.410.04-0.27
1493413.72.3413.82.402826-18.0-39.210.08.61.231.301.281.350.07-0.27
1488813.32.3313.62.372625-21.2-46.010.08.41.261.261.321.300.03-0.37
1487313.42.4013.72.372425-21.2-46.110.08.41.221.241.171.300.01-0.38
1485812.92.4013.82.322325-22.9-50.09.78.01.171.261.371.31-0.05-0.48
1484214.92.3914.12.342325-19.2-42.09.58.11.341.251.351.31-0.09-0.45
1482714.42.0914.32.342925-16.8-36.89.48.11.291.201.351.31-0.18-0.50
1481214.72.4115.02.372926-7.4-16.89.08.41.221.191.311.27-0.30-0.45
1479614.52.4215.12.402327-5.4-12.49.18.60.991.171.171.26-0.29-0.40
1478016.72.5415.32.4526260.0-0.79.19.01.101.171.171.29-0.29-0.30
1474915.02.5515.02.452726-3.1-7.39.39.01.251.171.331.29-0.24-0.30
1473315.72.3215.12.472626-0.9-2.59.39.21.281.251.481.30-0.14-0.17
1471713.22.4114.52.492726-6.1-13.59.89.41.211.261.291.31-0.01-0.13
1470114.82.5514.72.502426-2.7-6.19.79.51.401.281.231.35-0.01-0.07
1466913.72.6114.32.542726-4.0-8.710.29.91.161.321.241.400.140.07
1465316.22.6314.72.5628260.40.710.010.01.361.321.501.450.080.09
1463713.72.5314.72.5425270.40.59.99.91.491.291.721.520.020.03
1462015.02.4715.12.5525274.69.69.69.91.181.301.571.55-0.020.06
1460415.12.4914.82.492826-2.5-5.89.69.41.231.321.581.550.00-0.06
1458715.62.6515.12.4827280.40.39.39.31.261.271.371.50-0.12-0.12
1457114.62.3115.12.482328-0.8-2.29.49.31.461.321.531.48-0.06-0.08
1455415.32.5115.22.4835270.71.09.39.31.251.351.461.45-0.05-0.04
1453814.62.4415.02.422527-5.1-11.79.28.81.431.381.471.48-0.05-0.15
1450415.72.5115.22.5026272.44.79.39.51.361.391.411.430.000.03
1447014.72.3215.32.5123243.67.39.39.61.411.471.531.400.070.13
1441915.82.7215.32.4624220.50.59.19.11.491.561.301.350.110.11
1438415.62.5515.32.4919242.75.29.29.41.641.601.281.370.180.22
1436714.72.1815.62.5219257.816.39.19.71.891.631.251.360.200.33
1431115.82.6815.42.4432270.60.79.09.01.561.601.481.310.120.12
1429316.22.4915.62.4232280.70.78.88.81.581.591.481.230.060.06
1415314.72.3215.72.4730295.410.98.89.21.301.611.081.340.100.19
1391016.42.4315.52.422827-0.4-1.68.98.81.601.690.861.400.170.15
1381315.52.4215.32.402527-3.7-8.78.98.62.011.721.801.420.220.14
1379414.42.4315.32.432227-0.9-2.79.08.91.931.841.761.540.360.33
1377515.22.3914.92.422827-5.9-13.49.38.81.751.931.621.700.530.41
1375515.22.4714.92.403028-7.7-17.39.28.61.921.941.651.610.520.37
1371614.02.4115.22.433030-2.3-5.69.08.82.021.981.691.530.520.46
1361715.52.2815.52.423029-0.4-1.68.98.82.102.061.341.460.550.53
1359716.22.5815.62.4131290.70.78.78.72.112.011.381.350.470.47
1357716.32.3615.82.3924271.62.58.58.52.172.031.281.250.420.44
1355715.92.4415.82.3729270.0-1.18.48.41.672.001.091.190.380.37
1351715.12.3015.62.342427-3.4-8.58.48.12.082.041.201.070.420.34
1347715.42.1715.52.312727-6.7-15.58.47.91.982.011.011.030.390.25
1341615.42.4415.52.262927-9.9-22.68.27.42.282.050.771.060.380.18
1337615.62.2215.62.292628-7.1-16.58.27.72.052.001.081.070.340.19
1335515.82.2015.52.322729-5.4-12.88.48.01.842.001.221.120.390.27
1333515.82.4215.22.353229-7.0-16.08.88.21.871.931.241.200.400.25
1331515.12.3515.12.382930-6.1-13.98.98.51.991.941.271.240.460.33
1327413.72.5815.12.413129-4.6-10.79.18.71.891.991.201.230.550.45
1325315.22.3515.02.422829-5.5-12.59.28.82.132.001.271.190.570.46
1323315.62.3515.02.412629-5.8-13.29.28.72.102.001.191.180.570.46
1321215.22.4415.22.322928-8.6-19.58.78.01.882.011.011.140.450.28
1319215.02.3315.22.343028-7.8-17.88.78.12.012.011.211.100.480.32
1317115.02.1415.02.332829-10.5-23.58.98.01.951.971.031.050.460.25
1313015.12.4415.02.312830-12.0-26.98.87.82.141.981.051.060.450.21
1310914.62.3015.02.323131-11.2-25.08.87.91.862.000.931.010.470.25
1308915.22.3215.02.363133-8.3-18.68.98.31.952.031.080.970.530.37
1306815.12.3915.02.303633-11.7-26.38.77.82.092.010.940.970.460.23
1304815.22.3515.02.333733-9.9-22.28.88.02.092.040.860.990.520.33
1302715.12.1515.22.353234-7.8-17.78.88.22.072.121.030.970.590.44
1300614.62.4515.42.332835-6.6-15.38.58.02.022.131.040.960.540.40
1298615.72.4015.52.303735-7.3-17.08.37.72.332.190.961.010.540.39
1296516.42.2815.72.374036-1.0-3.18.58.32.142.220.931.000.610.58
1294515.72.2015.82.313737-3.3-8.38.27.92.372.281.080.980.600.52
1288316.12.5115.62.283736-7.1-16.58.27.62.242.270.990.980.590.44
1286215.22.1615.52.273335-9.5-21.78.37.52.312.280.960.980.630.43
1284214.82.2415.72.353434-2.5-6.48.48.22.282.260.920.930.640.58
1282115.42.2415.42.313634-7.6-17.48.57.82.202.250.920.880.640.49
1280116.82.5915.72.383233-0.9-2.98.58.42.272.220.850.880.630.60
1278014.82.3115.82.4034332.74.98.58.72.192.170.730.880.580.61
1276016.42.5015.52.4328320.91.18.88.82.142.170.980.880.650.66
1273915.82.3815.32.393432-3.4-8.18.98.62.052.170.910.890.660.59
1271913.92.3415.12.413032-4.3-10.09.18.72.212.210.920.930.760.66
1269915.72.4315.02.393232-6.8-15.49.18.52.272.230.930.930.770.64
1267813.72.4014.92.393332-7.3-16.49.18.52.382.260.930.930.810.67
1263815.92.4015.42.413233-1.8-4.68.88.72.232.280.950.940.760.72
1261715.62.3715.12.353133-8.0-18.18.88.22.212.280.950.940.770.61
1259716.12.4315.52.343632-5.0-11.78.68.12.302.280.960.960.700.59
1257714.22.1615.42.323334-6.9-15.98.57.92.282.280.900.940.680.54
1255715.52.3615.52.313036-6.6-15.38.47.82.372.301.050.950.670.53
1253715.72.2715.32.313837-8.5-19.48.57.82.242.310.860.960.720.55
1251716.12.3215.32.344538-6.5-14.98.68.12.322.321.000.990.760.62
1249715.12.4414.92.333839-11.4-25.58.98.02.352.281.010.950.780.55
1247714.42.3014.72.373738-11.1-24.69.28.42.352.291.010.970.870.66
1245713.32.3114.72.313536-14.1-31.29.07.92.142.250.900.930.760.49
1241814.62.4714.52.293335-17.5-38.79.17.72.332.190.950.880.720.39
1239816.32.0314.52.293434-17.7-39.09.17.72.092.160.770.830.700.36
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