(Table 1) Radionuclides and ESR dating of sediment cores PS1535-10 and PS1535-8 ...

• Main Authors: Hoffmann, Dirk L, Woda, Clemens, Strobl, Christopher, Mangini, Augusto
• Format: Dataset
• Language: English
• Published: PANGAEA 2001
• Subjects: DEPTH, sediment/rock; Age model, optional; Method comment; Equivalent dose; Dose rate, standard deviation; Thorium-232; Thorium-232, standard deviation; Thorium-230; Thorium-230, standard deviation; Uranium-238; Uranium-238, standard deviation; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard deviation; Potassium; Potassium, standard deviation; Water content, wet mass; Water content, standard deviation; Age, dated; Age, dated standard deviation; Piston corer BGR type; Age model, stable isotope stratigraphy; Calculated from mass/volume; Age, electron spin resonance ESR; ARK-IV/3; Polarstern; Arctic; Foraminifera*
• Online Access: https://dx.doi.org/10.1594/pangaea.120604; https://doi.pangaea.de/10.1594/PANGAEA.120604

ESR-spectra of foraminifera in arctic sediment cores display the [CO2]- -signal (g=2.0006). Research on the thermal behaviour of the [CO2]- -signal shows that both natural and artificial irradiation generates a precursor and a thermal unstable component of the [CO2]- -signal. The precursor can be transfered to the stable radical, and unstable radicals can be removed by heating. The signal-change by heating depends on the irradiation dose. Because of the varying response on thermal treatment, the dose-response curves show systematic differences depending on the applied procedure (single- or multi-aliquot method with or without heating). A model for the description of the [CO2]- -signal-change is presented. The combination of two exponential saturation functions seems to be an adequate analytical description of the dose-response curve of the [CO2]- -signal in foraminifera. Due to the limited thermal stability this signal can be used for dating foraminifera with ages up to about 190 ka. ... : Samples at 0.37-4.63 from core PS1535-8, samples at 5.48 and 7 m from core PS1535-10 ...