Barker, Stephen; Broecker, Wallace S; Clark, Elizabeth; Hajdas, Irka (2007): (Table 1) Age determination on various planktonic foraminifera from Ontong Java Plateau core top sediments [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.833118, Supplement to: Barker, S et al. (2007): Radiocarbon age offsets of foraminifera resulting from differential dissolution and fragmentation within the sedimentary bioturbated zone. Paleoceanography, 22(2), PA2205, https://doi.org/10.1029/2006PA001354
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Abstract:
Shells of coexisting species of planktonic foraminifera from the Ontong Java Plateau reveal radiocarbon age offsets of up to 2200 years. Similar offsets are found between fragments and whole shells of single species. Steady state modelling of dissolution and bioturbation within the sedimentary mixed layer predicts age differences of up to several kiloyears due to the interplay between differential dissolution and fragmentation of foraminifer shells and bioturbation. The observation that fragile foraminiferal shells are systematically older than those of more robust species is more difficult to explain. Mechanisms of chemical erosion, interface dissolution, and sediment redistribution are all apparently unable to explain this phenomenon. A possible solution is presented in which a particular species may be represented by two distinct classes of shells which are more or less robust. In this case, differential dissolution and fragmentation causes an increase in the mean age as the fragile class contributes less to the remaining intact shells. This study highlights the vulnerability of low sedimentation rate cores to the effects of dissolution and bioturbation.
Coverage:
Median Latitude: 0.003623 * Median Longitude: 160.843623 * South-bound Latitude: 0.000000 * West-bound Longitude: 158.000000 * North-bound Latitude: 0.013833 * East-bound Longitude: 162.734660
Minimum DEPTH, sediment/rock: 0 m * Maximum DEPTH, sediment/rock: 0 m
Event(s):
MW9109-36BC * Latitude: 0.000000 * Longitude: 158.000000 * Elevation: -2320.0 m * Location: Ontong Java Plateau * Campaign: MW9109 * Basis: Moana Wave * Method/Device: Box corer (BC)
MW9109-56BC * Latitude: 0.000000 * Longitude: 162.000000 * Elevation: -4040.0 m * Location: Ontong Java Plateau * Campaign: MW9109 * Basis: Moana Wave * Method/Device: Box corer (BC)
MW9109-63BC * Latitude: 0.013833 * Longitude: 160.639833 * Elevation: -3158.0 m * Location: Pacific * Campaign: MW9109 * Basis: Moana Wave * Method/Device: Piston corer (PC)
Comment:
All samples represent the 0 -3 cm interval. Measured by AMS at ETH, Zurich.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Latitude of event | Latitude | ||||
| 2 | Longitude of event | Longitude | ||||
| 3 | Optional event label | Event 2 | ||||
| 4 | Event label | Event | ||||
| 5 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 6 | Age, dated material | Dated material | Barker, Stephen | |||
| 7 | Sample mass | Samp m | mg | Barker, Stephen | ||
| 8 | Age, dated | Age dated | ka | Barker, Stephen | Age, 14C AMS | ages are for whole shells unless otherwise indicate |
| 9 | Age, dated standard deviation | Age dated std dev | ± | Barker, Stephen | Age, 14C AMS | sample weigths for the two leaching experiments are the combined weight of the leach and residual analyses |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
78 data points