Wilson, Paul A; Opdyke, Bradley N (1996): (Table 1) Chemical and isotopic compositions of rudist aragonite and magnesian calcite cements from ODP Hole 144-877A [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.712045
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Abstract:
The classic paleotemperature record based on d18O data from pelagic foraminiferal calcite suggests that equatorial sea-surface temperatures during the Maastrichtian (~12-20°C) were much cooler than today (~27-29°C). Such cool equatorial temperatures contradict basic theories of tropical atmospheric and ocean dynamics. We report d18O data from remarkably well preserved rudist aragonite and magnesian calcite cements of Maastrichtian age (~69+/-1 Ma) from the carbonate platform of Wodejebato guyot in the western Pacific. These data suggest that equatorial sea-surface temperatures in the Maastrichtian (best estimate ~27-32°C) were at least as warm as today. This finding helps reconcile the geologic d18O record with ocean-atmospheric dynamic theory and implies a reduction in the poleward heat flux required by global climate simulations of greenhouse conditions.
Related to:
Wilson, Paul A; Opdyke, Bradley N (1996): Equatorial sea-surface temperatures for the Maastrichtian revealed through remarkable preservation of metastable carbonate. Geology, 24(6), 555-558, https://doi.org/10.1130/0091-7613(1996)024%3C0555:ESSTFT%3E2.3.CO;2
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 12.019100 * Longitude: 164.922100
Date/Time Start: 1992-06-19T05:53:00 * Date/Time End: 1992-06-21T10:10:00
Minimum DEPTH, sediment/rock: 41 m * Maximum DEPTH, sediment/rock: 41 m
Event(s):
144-877A * Latitude: 12.019100 * Longitude: 164.922100 * Date/Time Start: 1992-06-19T05:53:00 * Date/Time End: 1992-06-21T10:10:00 * Elevation: -1366.0 m * Penetration: 190.5 m * Recovery: 25.23 m * Location: North Pacific Ocean * Campaign: Leg144 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 20 cores; 190.4 m cored; 0 m drilled; 13.3 % recovery
Comment:
Zero values mean below detection limit.
Parameter(s):
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
42 data points
Data
| 1 Depth sed [m] | 2 Sample label (DSDP/ODP/IODP sample designation) | 3 Samp type | 4 NOBS [#] | 5 Mg [%] (minimum) | 6 Mg [%] (maximum) | 7 Mg [%] (Calculated average/mean values) | 8 Sr [%] (minimum) | 9 Sr [%] (maximum) | 10 Sr [%] (Calculated average/mean values) | 11 Fe [%] (minimum) | 12 Fe [%] (maximum) | 13 Fe [%] (Calculated average/mean values) | 14 Mn [%] (minimum) | 15 Mn [%] (maximum) | 16 Mn [%] (Calculated average/mean values) | 17 δ13C carb [‰ PDB] (minimum) | 18 δ13C carb [‰ PDB] (maximum) | 19 δ13C carb [‰ PDB] (Calculated average/mean values) | 20 δ18O carb [‰ PDB] (minimum) | 21 δ18O carb [‰ PDB] (maximum) | 22 δ18O carb [‰ PDB] (Calculated average/mean values) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 41 | 144-877A-5R-3 | Cement (Mg-calcite) | 8 | 0.894 | 1.600 | 1.290 | 0.075 | 0.152 | 0.110 | 0.002 | 0.031 | 0.021 | 0 | 0 | 0 | 2.44 | 2.98 | 2.83 | -2.63 | -2.19 | -2.40 |
| 41 | 144-877A-5R-3 | Rudist (aragonite) | 14 | 0.022 | 0.092 | 0.052 | 0.208 | 0.306 | 0.248 | 0.000 | 0.182 | 0.024 | 0 | 0 | 0 | 2.40 | 3.87 | 2.89 | -2.83 | -1.99 | -2.69 |