Sedwick, Peter; Harris, Peter Townsend; Robertson, Lisette G; McMurtry, Gary M; Cremer, Maximilian D (2001): (Table 2) Age determination of sediment cores from the continental shelf of Mac Roberston Land, East Antarctica [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.847814, Supplement to: Sedwick, P et al. (2001): Holocene sediment records from the continental shelf of Mac. Robertson Land, East Antarctica. Paleoceanography, 16(2), 212-225, https://doi.org/10.1029/2000PA000504
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Abstract:
Geochemical records are presented for five sediment cores from basins on the continental shelf of Mac. Robertson Land, East Antarctica. The cores contain 2-4 m thick sequences of hemipelagic, siliceous mud and ooze (SMO) deposited under seasonally open marine conditions. The inner and middle shelf SMO sequences are massive dark olive green material, whereas the outer shelf SMO sequences are dark olive material interspersed with light olive green layers ~1-10 cm thick. The biogenic material is dominated by marine diatoms including Fragilariopsis curta, Fragilariopsis cylindrus, and Chaetoceros spp. in the dark-colored SMO and Corethron criophilum in the light-colored layers. Radiocarbon dates suggest that the cores provide continuous accumulation records extending from < 1 kyr before present (B.P.) back as far as 4-15 kyr B.P., with estimated accumulation rates of 0.07-5 mm/yr. The three core records from the middle and outer shelf suggest six episodes of increased accumulation of biogenic material at ~5.5 kyr B.P. (all three cores), 1, 2, and 6.2 kyr B.P. (two of the three cores), and 3.8 and 10.8 kyr B.P. (one core), most of which coincide with Corethron layers. We interpret these features as the result of enhanced diatom production over the outer shelf, possibly related to climatic warm periods. The absence of such features in the inner shelf core records is thought to reflect a relatively constant level of seasonal diatom production in adjacent waters maintained by a coastal polynya.
Further details:
Stuiver, Minze; Polach, Henry A (1977): Discussion: Reporting of 14C Data. Radiocarbon, 19(3), 355-363, https://doi.org/10.1017/S0033822200003672
Coverage:
Median Latitude: -67.433333 * Median Longitude: 64.441667 * South-bound Latitude: -67.800000 * West-bound Longitude: 63.150000 * North-bound Latitude: -67.050000 * East-bound Longitude: 65.800000
Minimum DEPTH, sediment/rock: 0.005 m * Maximum DEPTH, sediment/rock: 3.675 m
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Sedwick, Peter | |||
| 2 | Sample code/label | Sample label | Sedwick, Peter | OZ = Australian Nuclear Science and Technology Organization, NZ O New Zealand Institute of Geological and Nuclear Sciences | ||
| 3 | DEPTH, sediment/rock | Depth sed | m | Sedwick, Peter | Geocode | |
| 4 | δ13C, organic carbon | δ13C Corg | ‰ PDB | Sedwick, Peter | ||
| 5 | Comment | Comment | Sedwick, Peter | |||
| 6 | Age, dated | Age dated | ka | Sedwick, Peter | Age, 14C AMS | as defined by Stuiver and Polack (1977) |
| 7 | Age, dated standard deviation | Age dated std dev | ± | Sedwick, Peter | Age, 14C AMS | |
| 8 | Calendar age | Cal age | ka BP | Sedwick, Peter | Age, 14C calibrated | assumes surface sediment age of 1733 radiocarbon years BP |
| 9 | Laboratory code/label | Lab label | Sedwick, Peter |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
248 data points