Belanger, Paul; Matthews, R K (1984): (Table 1) Oxygen and carbon isotopes for foraminiferal taxa at DSDP Hole 76-540 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.809678, Supplement to: Belanger, P; Matthews, RK (1984): The foraminiferal isotope record across the Eocene/Oligocene boundary at Deep Sea Drilling Project Site 540. In: Buffler, RT; Schlager, W; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 77, 589-592, https://doi.org/10.2973/dsdp.proc.77.124.1984
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Abstract:
We analyzed the oxygen and carbon isotopic composition of planktonic and benthic foraminifers picked from 13 late Eocene to late Oligocene samples from DSDP Site 540 (23°49.73'N, 84°22.25'W, 2926 m water depth) from the Gulf of Mexico. An enrichment occurs in 18O of about 0.5 to 0.8 per mil in both benthic foraminifers and surface-dwelling planktonic foraminifers between the latest Eocene and early Oligocene. This early Oligocene maximum is followed by lower 18O values.
A 1.2 per mil d13C decrease in both benthic and planktonic foraminiferal data occurs from the late Eocene to the late Oligocene. There is a correspondence of the 13C signal to deep-sea records; however, the amplitude of this change is greater than previously seen in deep-sea cores, possibly as a result of proximity to terrestrial sources of carbon.
The covarying isotopic changes in both benthic and planktonic foraminifers suggest global causes, such as ice volume increases and increased terrestrial carbon input to the ocean. However, during the latter part of the record (early-late Oligocene), the increases in the benthic 18O without accompanying increases observed with planktonic foraminifers suggest that changes in only one part of the system occurred; one potential explanation being a decrease in bottom-water temperatures without concomitant changes in the surface waters. The 18O differences between species of planktonic foraminifers and the difference between planktonic and benthic 18O data indicate that diagenesis problems are minimal. These preliminary results are encouraging given that these cores are partially lithified.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 23.828800 * Longitude: -84.370800
Date/Time Start: 1981-01-19T00:00:00 * Date/Time End: 1981-01-19T00:00:00
Minimum DEPTH, sediment/rock: 177.86 m * Maximum DEPTH, sediment/rock: 236.14 m
Event(s):
77-540 * Latitude: 23.828800 * Longitude: -84.370800 * Date/Time: 1981-01-19T00:00:00 * Elevation: -2926.0 m * Penetration: 745.5 m * Recovery: 335.1 m * Location: Gulf of Mexico * Campaign: Leg77 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 79 cores; 745.5 m cored; 0 m drilled; 44.9 % recovery
Comment:
Sediment depth is given in mbsf. Size analyzed is indicated for planktonic taxa; the greater-than-150-µm size fraction was analyzed for benthic foraminifers.
Parameter(s):
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
86 data points
Data
| 1 Sample label | 2 Depth sed [m] | 3 C. cubensis δ18O [‰ PDB] | 4 C. cubensis δ13C [‰ PDB] | 5 Cibicidoides spp. δ18O [‰ PDB] | 6 Cibicidoides spp. δ13C [‰ PDB] | 7 G. ampliapertura δ18O [‰ PDB] | 8 G. ampliapertura δ13C [‰ PDB] | 9 Globigerinatheka spp. δ18O [‰ PDB] | 10 Globigerinatheka spp. δ13C [‰ PDB] | 11 Hantkenina sp. δ18O [‰ PDB] | 12 Hantkenina sp. δ13C [‰ PDB] | 13 H. cushmani δ18O [‰ PDB] | 14 H. cushmani δ13C [‰ PDB] | 15 Oridorsalis spp. δ18O [‰ PDB] | 16 Oridorsalis spp. δ13C [‰ PDB] | 17 Pseudohastigerina sp. δ18O [‰ PDB] | 18 Pseudohastigerina sp. δ13C [‰ PDB] |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 77-540-20-2,86-89 | 177.86 | 1.52 | 0.24 | ||||||||||||||
| 77-540-21-2,67-70 | 187.17 | -0.74 | 0.46 | 1.46 | 0.57 | 1.60 | -0.58 | ||||||||||
| 77-540-22-1,37-41 | 194.87 | -0.37 | 0.89 | 1.57 | 0.94 | ||||||||||||
| 77-540-23-1,49-52 | 204.49 | -0.77 | 0.68 | 1.69 | 0.83 | 1.51 | 0.94 | 1.26 | -0.92 | ||||||||
| 77-540-23-3,59-62 | 207.59 | -0.87 | 1.09 | 1.23 | 0.94 | 1.51 | -0.10 | ||||||||||
| 77-540-24-1,50-53 | 214.00 | -0.26 | 1.03 | 1.05 | 0.50 | ||||||||||||
| 77-540-24-3,48-51 | 216.98 | -0.43 | 0.88 | 1.29 | 0.78 | ||||||||||||
| 77-540-24-5,45-48 | 219.95 | -0.43 | 1.16 | 1.33 | 0.95 | -0.05 | 1.19 | ||||||||||
| 77-540-25-1,50-52 | 223.50 | 0.04 | 1.22 | 1.33 | 0.97 | ||||||||||||
| 77-540-25-3,46-51 | 226.46 | -0.38 | 1.20 | 1.40 | 1.45 | 1.22 | 1.65 | ||||||||||
| 77-540-26-1,137-140 | 233.87 | 1.07 | 1.46 | -0.07 | 1.56 | 0.15 | 1.07 | -0.8 | 0.71 | ||||||||
| 77-540-26-1,51-54 | 233.01 | 0.73 | 1.06 | -0.07 | 0.82 | 0.22 | 1.4 | ||||||||||
| 77-540-26-1,51-54 | 233.01 | 0.02 | 1.06 | ||||||||||||||
| 77-540-26-3,64-67 | 236.14 | 1.03 | 1.51 | -0.61 | 1.39 | -0.04 | 1.25 |