Keigwin, Lloyd D (1980): (Table 2) Stable carbon and oxygen isotope ratios of foraminifera of DSDP Holes 29-277 and 31-292 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.770309, Supplement to: Keigwin, LD (1980): Palaeoceanographic change in the Pacific at the Eocene-Oligocene boundary. Nature, 287(5784), 722-725, https://doi.org/10.1038/287722a0
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Abstract:
Oxygen isotopic studies both of benthic formanifera (Emiliani, 1954, doi:10.1126/science.119.3103.853; Savin et al., 1975, doi:10.1130/0016-7606(1975)86<1499:TMP>2.0.CO;2; Shackleton and Kennett, 1975, doi:10.2973/dsdp.proc.29.117.1975; Savin, 1977, doi:10.1146/annurev.ea.05.050177.001535) and shallow-marine carbonates ( Dorman, 1966; Devereux, 1967; Buchart, 1978, doi:10.1038/275121a0) have provided a useful monitor of marine palaeotemperatures. The Deep Sea Drilling Project (DSDP) has provided cores from many ocean basins to conduct detailed stable isotopic and palaeoceanographic studies of the Cenozoic and late Mesozoic. DSDP Sites 277 and 292, separated by ~60° latitude in Palaeogene times, each record an 18O enrichment in benthic foraminifera of nearly 1 per mil beginning at the Eocene-Oligocene boundary. Planktonic foraminiferal trends are similar to benthic trends in the high latitude southwest Pacific Ocean, but tropical planktonics show only a minor (~0.3 per mil) increase which may reflect a change in seawater composition. These results suggest a sudden cooling of Pacific deep waters and high latitude surface waters forms a useful stratigraphic marker for the Eocene-Oligocene boundary. This boundary is particularly important because of its association with several worldwide palaeo-oceanographic and biogeographic changes. These include a sudden drop in the calcite compensation depth of 1–2 km (van Andel et al., 1975; van Andel, 1975, doi:10.1016/0012-821X(75)90086-2); a decrease in planktonic microfossil diversity (Lipps, 1970, 10.2307/2406711; Kennett, 1978, doi:10.1016/0377-8398(78)90017-8; Sancetta, 1979, doi:10.1016/0377-8398(79)90025-2); a change in planktonic biogeographic patterns (Kennett, 1978, doi:10.1016/0377-8398(78)90017-8; Sancetta, 1979, doi:10.1016/0377-8398(79)90025-2; Haq and Lohmann, 1976, doi:10.1016/0377-8398(76)90008-6); and increased erosion of deep-sea sediments over wide areas (Kennet et al., 1972; Moore et al., 1978).
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: -18.202650 * Median Longitude: 145.421050 * South-bound Latitude: -52.223800 * West-bound Longitude: 124.650800 * North-bound Latitude: 15.818500 * East-bound Longitude: 166.191300
Date/Time Start: 1973-03-11T00:00:00 * Date/Time End: 1973-06-26T00:00:00
Minimum DEPTH, sediment/rock: 147.40 m * Maximum DEPTH, sediment/rock: 342.50 m
Event(s):
29-277 * Latitude: -52.223800 * Longitude: 166.191300 * Date/Time: 1973-03-11T00:00:00 * Elevation: -1214.0 m * Penetration: 472.5 m * Recovery: 253.4 m * Location: Antarctic Ocean/PLATEAU * Campaign: Leg29 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 45 cores; 425 m cored; 0 m drilled; 59.6 % recovery
31-292 * Latitude: 15.818500 * Longitude: 124.650800 * Date/Time: 1973-06-26T00:00:00 * Elevation: -2943.0 m * Penetration: 443.5 m * Recovery: 242.8 m * Location: North Pacific/Philippine Sea/CONT RISE * Campaign: Leg31 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 46 cores; 434 m cored; 9.5 m drilled; 56 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Keigwin, Lloyd D | DSDP/ODP/IODP sample designation | ||
| 3 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 4 | Oridorsalis sp., δ18O | Ordiorsalis δ18O | ‰ PDB | Keigwin, Lloyd D | Isotope ratio mass spectrometry | |
| 5 | Oridorsalis sp., δ13C | Oridorsalis δ13C | ‰ PDB | Keigwin, Lloyd D | Isotope ratio mass spectrometry | |
| 6 | Globigerina angiporoides, δ18O | G. angiporoides δ18O | ‰ PDB | Keigwin, Lloyd D | Isotope ratio mass spectrometry | |
| 7 | Globigerina angiporoides, δ13C | G. angiporoides δ13C | ‰ PDB | Keigwin, Lloyd D | Isotope ratio mass spectrometry | |
| 8 | Globigerina ampliapertura, δ18O | G. ampliapertura δ18O | ‰ PDB | Keigwin, Lloyd D | Isotope ratio mass spectrometry | |
| 9 | Globigerina ampliapertura, δ13C | G. ampliapertura δ13C | ‰ PDB | Keigwin, Lloyd D | Isotope ratio mass spectrometry |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
249 data points