Sancetta, Constance A; Heusser, Linda E; Hall, Michael A (1992): Stable oxygen isotope ratios, calcium carbonate and opal content in late Pliocene sediments of DSDP Hole 75-532 in the Southeast Atlantic (Table 1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.683654, Supplement to: Sancetta, CA et al. (1992): Late Pliocene climate in the Southeast Atlantic: Preliminary results from a multi-disciplinary study of DSDP Site 532. Marine Micropaleontology, 20(1), 59-75, https://doi.org/10.1016/0377-8398(92)90009-9
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Abstract:
Site 532 on the Walvis Ridge was sampled at 4000- to 800-year intervals from 2.24 to 2.60 Ma, spanning the three large glacial advances of the late Pliocene. An age model was created by correlating the oxygen isotope record to Site 607 with linear interpolations between tie-lines. The resultant age model differs from that in the site reports by more than 800,000 years, due to misidentification of a magnetic boundary. Sedimentation rates varied by an order of magnitude at this site, with minimum accumulation during glacial events. Interglacial intervals were charactrized by high marine production and high summer precipitation on land, while glacials had very low production and arid continental climate. During the large glacial events (Stages 96-100) conditions of low production and continental aridity reached their greatest intensity, but there is no evidence of a permanent mode shift in either marine or terrestrial records. Calcite concentration has a strong variation at obliquity frequencies, with maxima during interglacials, but occasionally shows a large amplitude at precessional frequencies as well, so that high concentrations occur in a few glacial intervals. As a result, color variation is not a reliable guide to glacial-scale cycles at this site. Composition of the phytoplankton assemblage is diverse and highly variable, and we have not been able to distinguish a clear indicator of upwelling-related production. Spectral analysis reveals obliquity and precessional signals in the pollen data, while several diatom records contain combination tones, indicating that these data represent a complicated response to both local and high-latitude forcing.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: -19.743500 * Longitude: 10.518800
Date/Time Start: 1980-08-20T00:00:00 * Date/Time End: 1980-08-20T00:00:00
Minimum DEPTH, sediment/rock: 70.02 m * Maximum DEPTH, sediment/rock: 96.82 m
Event(s):
75-532 * Latitude: -19.743500 * Longitude: 10.518800 * Date/Time: 1980-08-20T00:00:00 * Elevation: -1331.0 m * Penetration: 250.8 m * Recovery: 232 m * Location: South Atlantic * Campaign: Leg75 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 59 cores; 242.8 m cored; 8 m drilled; 95.6 % recovery
Comment:
Age model relies upon matching the isotope record to that at DSDP Site 94-607 in the North Atlantic (Raymo et al., 1989)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | AGE | Age | ka BP | Geocode | ||
| 3 | Uvigerina spp., δ18O | Uvigerina spp. δ18O | ‰ PDB | Sancetta, Constance A | Isotope ratio mass spectrometry | |
| 4 | Calcium carbonate | CaCO3 | % | Sancetta, Constance A | Carbonate bomb (Müller & Gastner, 1971) | |
| 5 | Opal, biogenic silica | bSiO2 | % | Sancetta, Constance A | Opal, extraction; Mortlock & Froelich, 1989 |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
702 data points