(Table 3) Foraminiferal 87Sr/86Sr ratios and ages of ODP Hole 162-986D sediments ...

• Main Authors: Forsberg, Carl Fredrik, Solheim, Anders, Elverhoi, Anders, Jansen, Eystein, Channell, James E T, Andersen, Espen Sletten
• Format: Dataset
• Language: English
• Published: PANGAEA 1999
• Subjects: Sample code/label; Age, dated material; DEPTH, sediment/rock; Strontium-87/Strontium-86 ratio; Age, dated; Age, minimum/young; Age, maximum/old; Drilling/drill rig; DSDP/ODP/IODP sample designation; Age, strontium isotope, LOWESS fit Howarth & McArthur 1997; Leg162; Joides Resolution; Ocean Drilling Program ODP; Barents Sea; Svalbard; Svalbard margin
• Online Access: https://dx.doi.org/10.1594/pangaea.805206; https://doi.pangaea.de/10.1594/PANGAEA.805206

Site 986 was drilled to 965 meters below seafloor (mbsf) on the western Svalbard margin to record the onset of glaciations and to date and document the glacial evolution in the Svalbard-Barents Sea region during the Pliocene-Pleistocene. In this paper, results of sedimentological analyses are discussed in light of seismic stratigraphy and new age determinations. The latter were difficult to obtain in the glacial deposits, and datums are sparse. Through combined paleomagnetic data, biostratigraphy, and Sr isotopes, however, an overall chronology for the main evolutionary steps is suggested. The cored sequence at Site 986 is younger than 2.6 Ma, and the lower 60 m of the section contains no evidence of a major glacial influence. An initial glaciation is interpreted to have occurred at ~2.3 Ma, resulting in increased sand deposition from debris flows at Site 986 and forming a prominent seismic reflector, R7. However, glaciers probably did not reach the shelf break until ~1.6-1.7 Ma (Reflector R6), after which ... : Sediment depth is given in mbsf. See also doi:10.1594/PANGAEA.805084 for a different Sr age determination of ODP Hole 162-986D. ...