Flower, Benjamin P (1997): (Table 1) Strontium isotope ratios (87Sr/86Sr) of Neogloboquadrina pachyderma (sinistrally coiling) tests from ODP Hole 151-910A [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.712046
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Abstract:
The sediment sequence at Ocean Drilling Program (ODP) Site 910 (556 m water depth) on the Yermak Plateau in the Arctic Ocean features a remarkable "overconsolidated section" from ~19 to 70-95 m below sea floor (m bsf), marked by large increases in bulk density and sediment strength. The ODP Leg 151 Shipboard Scientific Party interpreted the overconsolidated section to be caused by (1) grounding of a marine-based ice sheet, derived from Svalbard and perhaps the Barents Sea ice sheet, and/or (2) coarser-grained glacial sedimentation, which allowed increased compaction. Here I present planktonic foraminiferal d18O data based on Neogloboquadrina pachyderma (sinistrally coiling) that date the termination of overconsolidation near the boundary between isotope stages 16 and 17 (ca. 660 ka). No evidence is found for coarser grained sedimentation, because lithic fragments >150 µm exhibit similar mean concentrations throughout the upper 24.5 m bsf. The overconsolidated section may reflect more extensive ice-sheet grounding prior to ca. 660 ka, suggesting a major change in state of the Svalbard ice sheets during the mid-Quaternary. Furthermore, continuous sedimentation since that time argues against a pervasive Arctic ice shelf impinged on the Yermak Plateau during the past 660 k.y. These findings suggest that Svalbard ice-sheet history was largely independent of circum-Arctic ice-sheet history during the middle to late Quaternary.
Related to:
Flower, Benjamin P (1997): Overconsolidated section on the Yermak Plateau, Arctic Ocean: Ice sheet grounding prior to ca. 660 ka? Geology, 25(2), 147-150, https://doi.org/10.1130/0091-7613(1997)025%3C0147:OSOTYP%3E2.3.CO;2
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 80.264700 * Longitude: 6.590000
Date/Time Start: 1993-08-17T15:30:00 * Date/Time End: 1993-08-17T23:38:00
Minimum Elevation: -567.0 m * Maximum Elevation: -567.0 m
Event(s):
151-910A * Latitude: 80.264700 * Longitude: 6.590000 * Date/Time Start: 1993-08-17T15:30:00 * Date/Time End: 1993-08-17T23:38:00 * Elevation: -567.0 m * Penetration: 34 m * Recovery: 24.26 m * Location: North Greenland Sea * Campaign: Leg151 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 5 cores; 34 m cored; 0 m drilled; 71.4 % recovery
Comment:
Values normalized to NBS987 (National Bureau of Standards) value of 0.710248.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Depth, top/min | Depth top | m | Flower, Benjamin P | ||
| 2 | Depth, bottom/max | Depth bot | m | Flower, Benjamin P | ||
| 3 | Sample code/label | Sample label | Flower, Benjamin P | DSDP/ODP/IODP sample designation | ||
| 4 | Strontium-87/Strontium-86 ratio | 87Sr/86Sr | Flower, Benjamin P | Isotope ratio mass spectrometry |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
12 data points