Pudsey, Carol J (1990): Paleomagnetic age assigments of ODP Site 113-697 (Table 1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.746490, Supplement to: Pudsey, CJ (1990): Grain size and diatom content of hemipelagic sediments at Site 697, ODP Leg 113: a record of Pliocene-Pleistocene climate. In: Barker, PF; Kennett, JP; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 113, 111-120, https://doi.org/10.2973/odp.proc.sr.113.147.1990
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Abstract:
At Site 697 a 320 m thick Pleistocene and Pliocene section was recovered, consisting of hemipelagic terrigenous mud with varying amounts of diatoms, thin altered ash layers, and ice-rafted debris (IRD). Sedimentation rates range from 41 m/m.y. (upper Pleistocene) to 150 m/m.y. (lower Pliocene). Diatom percentage and sediment grain-size have been measured for the whole section with approximately one sample per 5,000 yr. IRD is most abundant in the lower Pliocene (sediments older than 4.5 Ma) following the first major West Antarctic glaciation. A decrease in IRD to near-zero above 3.2 Ma may record a transition from valley glaciers to a grounded ice-sheet on West Antarctica. Bottom current flow, recorded in sediments as the proportion of silt, was at a maximum around 3.0-3.3 Ma then gradually decreased until 0.5 Ma. In the upper Pleistocene, maxima in diatom percentage are assumed to occur during interglacials, implying reduced sea-ice cover; maxima in silt percentage correspond to diatom maxima, implying stronger bottom water flow during interglacials.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: -61.810500 * Longitude: -40.291800
Date/Time Start: 1987-03-02T00:00:00 * Date/Time End: 1987-03-07T00:00:00
Minimum DEPTH, sediment/rock: 2.97 m * Maximum DEPTH, sediment/rock: 295.70 m
Event(s):
113-697 * Latitude: -61.810500 * Longitude: -40.291800 * Date/Time Start: 1987-03-02T00:00:00 * Date/Time End: 1987-03-07T00:00:00 * Elevation: -3492.0 m * Penetration: 343.8 m * Recovery: 214.9 m * Location: Weddell Sea * Campaign: Leg113 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 35 cores; 333 m cored; 0 m drilled; 64.5% recovery
Comment:
Analysts: Hamilton and O'Brien (in prep.). Magentic reversals inferred to lie within gaps in the section are omitted.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Datum level | DL | Pudsey, Carol J | |||
| 2 | Age model | Age model | ka | Pudsey, Carol J | ||
| 3 | DEPTH, sediment/rock | Depth sed | m | Geocode |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
32 data points