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Spectroscopic isotope ratio analysis on speleothem fluid inclusions - analytics and paleoclimatic case studies
In this thesis the reconstruction of climatic conditions and paleotemperatures by the analysis of oxygen (δ18O) and hydrogen (δ2H) isotopes of fluid inclusions in speleothems from two different climatic zones (mid-latitudes and tropics) was performed. An extraction and processing system for fluid inclusion analysis with laser spectroscopy was developed and characterized with respect to the memory or amount effect. I could exclude disturbance effects and achieve a precision of 0.5‰ for δ18O and 1.5‰ for δ2H in replicated measurements with water volumes >0.2μl. The analysis of stable water isotopes allows the determination of paleotemperatures using the classic carbonate thermometer as well as the application of the δ2H/T - relationship with a precision down to ±0.45°C. For the western tropical Atlantic I identified a cooling during the Heinrich stadials (2 and 3) of ~3°C applying the classic carbonate oxygen isotope thermometer. Beyond direct temperature determination, the analysis of fluid inclusions provides information about karst water availability during stalagmite formation. For instance, the δ18O and δ2H values of two speleothems from Germany and Puerto Rico, show slopes of +2.3±1.1 and +3.7±0.2, respectively, that are significantly lower compared to meteoric water lines (slope of ~8). This clear evaporation signal in the related fluid inclusions probably indicates evaporation effects (cave or epikarst), which are enhanced during drier climate conditions.
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500 Naturwissenschaften und Mathematik
500 Natural sciences and mathematics
530 Physik
530 Physics
550 Geowissenschaften
550 Earth sciences