Publication Date:
2023-06-27
Description:
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.
Keywords:
Age, dated; Age, dated standard deviation; Age, electron spin resonance (ESR); Age model, optional; Age model, stable isotope stratigraphy; ARK-IV/3; Calculated from weight/volume; DEPTH, sediment/rock; Dose rate, standard deviation; Equivalent dose; Fram Strait; GIK21535-10 PS11/430-10; KL; Method comment; Piston corer (BGR type); Polarstern; Potassium; Potassium, standard deviation; PS11; PS1535-10; Thorium-230; Thorium-230, standard deviation; Thorium-232; Thorium-232, standard deviation; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard deviation; Uranium-238; Uranium-238, standard deviation; Water content, standard deviation; Water content, wet mass
Type:
Dataset
Format:
text/tab-separated-values, 162 data points
