Vincent, Edith; Killingley, John S; Berger, Wolfgang H (1980): Stable isotope ratios of benthic and planktonic foraminifera from Late Miocene sediments of DSDP Hole 24-238 on the Central Indian Ocean Ridge (Appendix 1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.682289, Supplement to: Vincent, E et al. (1980): The Magnetic Epoch-6 carbon shift: A change in the ocean´s 13C/12C ratio 6.2 million years ago. Marine Micropaleontology, 5, 185-203, https://doi.org/10.1016/0377-8398(80)90010-9
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Abstract:
Tropical Indian Ocean planktonic and benthic foraminifera have 13C/12C ratios which change abruptly within Magnetic Epoch 6 about 6.2 million years ago. All species analyzed in the Late Miocene section of DSDP Site 238 show a shift towards lighter values of delta13C by about 0.8‰. The oxygen isotope signal indicates that the pre-shift period is climatically quiet while the post-shift period has strong fluctuations. We suggest that the shift reflects a sudden increase in the rate of supply of organic carbon from coastal lowlands and from shelves exposed by regression, as well as a change in deep circulation patterns and ocean fertility. The event marks the transition of the ocean-atmosphere system from a quiet Early and Middle Neogene climatic regime toward a Late Neogene regime characterized by climatic amplifying mechanisms (albedo feedback, bottom water production) located around the northern North Atlantic. The beginning of this regime may have been strongly influenced by the isolation of the Mediterranean basin.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: -11.153500 * Longitude: 70.526000
Date/Time Start: 1972-06-16T00:00:00 * Date/Time End: 1972-06-16T00:00:00
Minimum DEPTH, sediment/rock: 132.66 m * Maximum DEPTH, sediment/rock: 280.06 m
Event(s):
24-238 * Latitude: -11.153500 * Longitude: 70.526000 * Date/Time: 1972-06-16T00:00:00 * Elevation: -2832.0 m * Penetration: 586.5 m * Recovery: 424 m * Location: Indian Ocean//FRACTURE ZONE * Campaign: Leg24 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 63 cores; 577 m cored; 9.5 m drilled; 73.5 % 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 | Vincent, Edith | DSDP/ODP/IODP sample designation | ||
| 3 | Globigerinoides sacculifer, δ18O | G. sacculifer δ18O | ‰ PDB | Vincent, Edith | 350-420 µm size fraction | |
| 4 | Globigerinoides sacculifer, δ13C | G. sacculifer δ13C | ‰ PDB | Vincent, Edith | 350-420 µm size fraction | |
| 5 | Globoquadrina altispira, δ18O | G. altispira δ18O | ‰ PDB | Vincent, Edith | 350-420 µm size fraction | |
| 6 | Globoquadrina altispira, δ13C | G. altispira δ13C | ‰ PDB | Vincent, Edith | 350-420 µm size fraction | |
| 7 | Globoquadrina venezuelana, δ18O | G. venezuelana δ18O | ‰ PDB | Vincent, Edith | 420-590 µm size fraction | |
| 8 | Globoquadrina venezuelana, δ13C | G. venezuelana δ13C | ‰ PDB | Vincent, Edith | 420-590 µm size fraction | |
| 9 | Cassidulina subglobosa, δ18O | C. subglobosa δ18O | ‰ PDB | Vincent, Edith | >250 µm size fraction | |
| 10 | Cassidulina subglobosa, δ13C | C. subglobosa δ13C | ‰ PDB | Vincent, Edith | >250 µm size fraction | |
| 11 | Favocassidulina favus, δ18O | F. favus δ18O | ‰ PDB | Vincent, Edith | >250 µm size fraction | |
| 12 | Favocassidulina favus, δ13C | F. favus δ13C | ‰ PDB | Vincent, Edith | >250 µm size fraction | |
| 13 | Oridorsalis umbonatus, δ18O | O. umbonatus δ18O | ‰ PDB | Vincent, Edith | >250 µm size fraction | |
| 14 | Oridorsalis umbonatus, δ13C | O. umbonatus δ13C | ‰ PDB | Vincent, Edith | >250 µm size fraction | |
| 15 | Planulina wuellerstorfi, δ18O | P. wuellerstorfi δ18O | ‰ PDB | Vincent, Edith | >250 µm size fraction | |
| 16 | Planulina wuellerstorfi, δ13C | P. wuellerstorfi δ13C | ‰ PDB | Vincent, Edith | >250 µm size fraction | |
| 17 | Uvigerina spp., δ18O | Uvigerina spp. δ18O | ‰ PDB | Vincent, Edith | >250 µm size fraction | |
| 18 | Uvigerina spp., δ13C | Uvigerina spp. δ13C | ‰ PDB | Vincent, Edith | >250 µm size fraction |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
467 data points