(Table 1) Strontium isotope ratios (87Sr/86Sr) of Neogloboquadrina pachyderma (sinistrally coiling) tests from ODP Hole 151-910A ...

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 OD...

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Bibliographic Details
Main Author: Flower, Benjamin P
Format: Dataset
Language:English
Published: PANGAEA 1997
Subjects:
Depth, top/min
Depth, bottom/max
Sample code/label
Strontium-87/Strontium-86 ratio
Drilling/drill rig
DSDP/ODP/IODP sample designation
Isotope ratio mass spectrometry
Leg151
Joides Resolution
Ocean Drilling Program ODP
Arctic Ocean
Barents Sea
Foraminifera*
Ice Sheet
Neogloboquadrina pachyderma
Sea ice
Svalbard
Yermak plateau
Online Access:https://dx.doi.org/10.1594/pangaea.712046
https://doi.pangaea.de/10.1594/PANGAEA.712046
Description
Summary: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 ... : Values normalized to NBS987 (National Bureau of Standards) value of 0.710248. ...

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