Le, Jianning; Mix, Alan C; Shackleton, Nicholas J (1995): (Appendix) Relative abundance of planktonic foraminifera in ODP Site 138-846 late Quaternary sediments [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.808207, Supplement to: Le, J et al. (1995): Late Quaternary paleoceanography in the eastern Equatorial Pacific Ocean from planktonic foraminifers: a high-resolution record from Site 846. In: Pisias, NG; Mayer, LA; Janecek, TR; Palmer-Julson, A; van Andel, TH (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 138, 675-693, https://doi.org/10.2973/odp.proc.sr.138.138.1995
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Abstract:
High-resolution records of d18O and relative abundances of planktonic foraminifers were generated for ODP Leg 138 Site 846 for the past 800 k.y., with an average sampling interval of 3.6 k.y. The time scale was constructed by correlating the benthic d18O record to the SPECMAP and ODP Site 677 d18O time scales using the mapping function technique of Martinson et al. (1981). Our observations show that variations in the foraminiferal assemblages, although influenced by dissolution, are interpretable in terms of changing characteristics of upper ocean waters.
Carbonate dissolution as indicated by fragmentation of planktonic foraminifers shows concentrated variance that is coherent with d18O at the 100 and 41 k.y. orbital periods. At these periods, maximum dissolution occurs during interglacial extremes. This finding differs from previous studies that have indicated that in this region percent carbonate minimum lags global ice volume minimum.
N. dutertrei and dextral N. pachyderma dominate the assemblages, but do not show consistent relationships relative to glacial-interglacial cycles. However, less abundant species G. ruber, G. menardii, G. glutinata and G. sacculifer show positive and G. bulloides negative correlation with the d18O record. Q-mode factor analysis of the Site 846 assemblages and comparison with modern assemblages suggest the following. Prior to and during interglacials, the area was considerably warmer and more subtropical than at present; during glacials, the area was colder than at present with greater upwelling and advection off the eastern boundary, and possibly a stronger Peru Current; the equatorial ôcool tongueö was also possibly stronger.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: -3.095000 * Longitude: -90.818330
Date/Time Start: 1991-05-21T00:00:00 * Date/Time End: 1991-05-26T00:00:00
Minimum DEPTH, sediment/rock: 0.12 m * Maximum DEPTH, sediment/rock: 26.67 m
Event(s):
138-846 * Latitude: -3.095000 * Longitude: -90.818330 * Date/Time Start: 1991-05-21T00:00:00 * Date/Time End: 1991-05-26T00:00:00 * Elevation: -3296.0 m * Penetration: 871.5 m * Recovery: 821.61 m * Location: South Pacific Ocean * Campaign: Leg138 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 92 cores; 865.5 m cored; 0 m drilled; 94.9 % recovery
Comment:
Sediment depth is given in mcd (Shipboard composite depth).
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample code/label | Sample label | Le, Jianning | DSDP/ODP/IODP sample designation | ||
| 2 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 3 | Depth, composite revised | Depth comp r | rmcd | Le, Jianning | Intercore correlation | |
| 4 | Orbulina universa | O. universa | % | Le, Jianning | Counting >150 µm fraction | |
| 5 | Globigerinoides ruber | G. ruber | % | Le, Jianning | Counting >150 µm fraction | |
| 6 | Globigerinoides tenellus | G. tenellus | % | Le, Jianning | Counting >150 µm fraction | |
| 7 | Globigerinoides sacculifer | G. sacculifer | % | Le, Jianning | Counting >150 µm fraction | |
| 8 | Globigerinella aequilateralis | G. aequilateralis | % | Le, Jianning | Counting >150 µm fraction | |
| 9 | Globigerinella calida | G. calida | % | Le, Jianning | Counting >150 µm fraction | |
| 10 | Globigerina bulloides | G. bulloides | % | Le, Jianning | Counting >150 µm fraction | |
| 11 | Globigerina rubescens | G. rubescens | % | Le, Jianning | Counting >150 µm fraction | |
| 12 | Globigerina rubescens | G. rubescens | # | Le, Jianning | Counting >150 µm fraction | |
| 13 | Neogloboquadrina pachyderma dextral | N. pachyderma d | % | Le, Jianning | Counting >150 µm fraction | |
| 14 | Neogloboquadrina dutertrei | N. dutertrei | % | Le, Jianning | Counting >150 µm fraction |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
5736 data points
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