Coarse fraction, radiocarbon datings, and planktic stable isotope data from sediment core PS93/031-5 (NW Fram Strait)
The coarse fraction content and the oxygen and carbon isotopic compositions of two morphotyes of planktic foraminifers Neogloboquadrina pachyderma were determined from sediment samples obtained from sediment core PS93/031-5. The age model is based on 9 radiocarbon datings obtained on ~2000 specimens...
| Main Authors: | , |
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| Format: | Other/Unknown Material |
| Language: | English |
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PANGAEA
2021
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| Subjects: | |
| Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.930425 https://doi.org/10.1594/PANGAEA.930425 |
| Summary: | The coarse fraction content and the oxygen and carbon isotopic compositions of two morphotyes of planktic foraminifers Neogloboquadrina pachyderma were determined from sediment samples obtained from sediment core PS93/031-5. The age model is based on 9 radiocarbon datings obtained on ~2000 specimens of N. pachyderma each. Grain size measurements occurred in May-July 2017. Stable isotope measurements were performed in August 2018 to February 2019. Radiocarbon datings were performed in August 2018 to April 2019. According to the radiocarbon datings (no reservoir correction applied) the sediment core covers the Late Quaternary time interval from 4,023 to 18,135 years before present (1950 CE). No sediments are present from the interval 11,170-15,950 years before present (hiatus at 25 cm core depth). When a conversion to calibrated years is performed with the program Calib 8.2 (http://calib.org/calib/), using the IntCal20 data set and applying a reservoir correction of 550 years, the core covers the interval of 3,750-23,230 years before present, with the hiatus covering the interval 12,660-18,550 years. Sediment core PS93/031-5 was obtained during RV POLARSTERN expedition PS93.1 in the northwestern Fram Strait on the Northeast Greenland continental margin from 2,135 m water depth. The data were collected to reconstruct the Late Quaternary paleoenvironment in the northwestern Fram Strait, the glacial history of the northeast Greenland shelf, and the export of freshwater from the Arctic to the North Atlantic in the last ca. 21,000 years. Sediment slices of approx. 5 mm thickness were taken from sediment core PS93/031-5 every 0.5 cm (~30 g dry sediment per sample). Sediments were freeze-dried, weighed, and washed with deionized water through a 63 µm mesh. The remaining coarse fraction was dried at 50°C and weighed. Coarse fraction percentages were calculated as [coarse fraction weight] * 100 / [dry bulk weight]. Planktic foraminifers Neogloboquadrina pachyderma were hand-picked from the 100-250 µm fraction for stable ... |
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