Zachos, James C; Opdyke, Bradley N; Quinn, Terrence Michael; Jones, Charles E; Halliday, Alex N (1999): (Table 1) Strontium isotope ratios of planktonic foraminifera and ostracoda from ODP Hole 120-748B on the Kerguelen Plateau, Indian Ocean [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.695370, Supplement to: Zachos, JC et al. (1999): Early cenozoic glaciation, antarctic weathering, and seawater 87Sr/86Sr: is there a link? Chemical Geology, 161(1-3), 165-180, https://doi.org/10.1016/S0009-2541(99)00085-6
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Abstract:
Stable and radiogenic isotopic and sedimentological data from sub-Antarctic deep sea sediment cores reveal a temporal link between changes in seawater 87Sr/86Sr ratios and major episodes of late Eocene-early Oligocene climate change. The 87Sr/86Sr records show two major inflections, one at 38-39 Ma near the middle/late Eocene boundary, followed by another at 33.4 Ma. Similarly, the oxygen isotope, ice-rafted debris, and clay assemblage records indicate two important climatic events: the appearance of alpine glaciers and/or small ice-sheets on Antarctica in the late Eocene at 38-39 Ma, followed by a rapid transition to larger and more permanent temperate ice-sheets in the early Oligocene at 33.4 Ma. Moreover, during the early Oligocene 30-33 Ma. three to four inferred peaks in glacial activity appear to coincide with subtle steps in the 87Sr/86Sr record. The coupled variations in climate and seawater Sr isotope ratios during the Eocene/Oligocene imply a strong causal link between the two. Either changes in climate directly influenced patterns of continental weathering and hence seawater chemistry, and/or a tectonic event e.g., uplift.as reflected in weathering and seawater chemistry triggered relatively abrupt changes in global climate.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: -58.441000 * Longitude: 78.998100
Date/Time Start: 1988-03-14T07:30:00 * Date/Time End: 1988-03-15T11:00:00
Minimum DEPTH, sediment/rock: 67.00 m * Maximum DEPTH, sediment/rock: 179.60 m
Event(s):
120-748B * Latitude: -58.441000 * Longitude: 78.998100 * Date/Time Start: 1988-03-14T07:30:00 * Date/Time End: 1988-03-15T11:00:00 * Elevation: -1301.0 m * Penetration: 225.1 m * Recovery: 190.15 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg120 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 25 cores; 225.1 m cored; 0 m drilled; 84.5 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Sample code/label | Sample label | Zachos, James C | DSDP/ODP/IODP sample designation | ||
| 3 | Sample type | Samp type | Zachos, James C | |||
| 4 | Strontium-87/Strontium-86 ratio | 87Sr/86Sr | Zachos, James C | |||
| 5 | Strontium-87/Strontium-86 ratio, error | 87Sr/86Sr e | ± | Zachos, James C | 2 sigma |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
154 data points