Loubere, Paul (1987): (Table 3) Oxygen isotope ratios of benthic foraminifera from DSDP Hole 80-548 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.761049, Supplement to: Loubere, P (1987): Changes in mid-depth North Atlantic and Mediterranean circulation during the Late Pliocene - Isotopic and sedimentological evidence. Marine Geology, 77(1-2), 15-38, https://doi.org/10.1016/0025-3227(87)90081-8
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Abstract:
Presently, the intermediate depths of the North Atlantic Ocean are occupied by a great lens of warm, saline water whose source is the Mediterranean Sea. This water flows both westward and northward, finally entering the Norwegian Sea where it may contribute to the formation of North Atlantic Deep Water. The Late Neogene history of Mediterranean Outflow in the Atlantic can be monitored at DSDP-IPOD Site 548 on the continental slope Southwest of Ireland using benthic Foraminifera oxygen isotope values. Isotopic data from 154 samples indicate that Mediterranean water was absent from the mid-depth North Atlantic from 3.4 to 3.2 Ma ago. However, at about 2.9 Ma ago the isotopic values at Site 548 diverge from those recorded from the deep North Atlantic and they can be interpreted to indicate the appearance of a new water mass, possibly Mediterranean water, in the North Atlantic water column. This appearance may be related to climatic changes that occurred around the Mediterranean Basin at about 2.9 Ma ago. The analysis of 189 samples for grain-size distributions shows that a significant increase in the silt-size fraction occurs at the same level that isotopic analysis indicates a change in bottom waters at Site 548. The grainsize data support the hypothesis that mid-depth water-mass changes occurred at about 2.9 Ma ago.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 48.915800 * Longitude: -12.164000
Date/Time Start: 1981-06-10T00:00:00 * Date/Time End: 1981-06-10T00:00:00
Minimum Elevation: -1251.0 m * Maximum Elevation: -1251.0 m
Event(s):
80-548 * Latitude: 48.915800 * Longitude: -12.164000 * Date/Time: 1981-06-10T00:00:00 * Elevation: -1251.0 m * Penetration: 211 m * Recovery: 210.2 m * Location: North Atlantic/SPUR * Campaign: Leg80 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 35 cores; 211 m cored; 0 m drilled; 99.6 % recovery
Comment:
For the age model of DSDP Hole 80-548 see Loubere (1987) data set: doi:10.1594/PANGAEA.761043.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample code/label | Sample label | Loubere, Paul | DSDP/ODP/IODP sample designation | ||
| 2 | Cibicidoides kullenbergi, δ18O | C. kullenbergi δ18O | ‰ PDB | Loubere, Paul | Mass spectrometry | |
| 3 | Cibicidoides spp., δ18O | Cibicidoides spp. δ18O | ‰ PDB | Loubere, Paul | Mass spectrometry | Cibicidoides kullenbergi + C. robertsonianus |
| 4 | Cibicidoides robertsonianus, δ18O | C. robertsonianus δ18O | ‰ PDB | Loubere, Paul | Mass spectrometry | |
| 5 | Globocassidulina subglobosa, δ18O | G. subglobosa δ18O | ‰ PDB | Loubere, Paul | Mass spectrometry | |
| 6 | Uvigerina auberiana, δ18O | U. auberiana δ18O | ‰ PDB | Loubere, Paul | Mass spectrometry | |
| 7 | Uvigerina peregrina, δ18O | U. peregrina δ18O | ‰ PDB | Loubere, Paul | Mass spectrometry | |
| 8 | Uvigerina spp., δ18O | Uvigerina spp. δ18O | ‰ PDB | Loubere, Paul | Mass spectrometry | Uvigerina peregrina + U. auberiana |
| 9 | Laboratory | Lab | Loubere, Paul |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
436 data points