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Tracing ocean circulation and weathering using radiogenic isotopes: An isotope geochemical approach to reconstruct glacialinter,Used
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This dissertation aims to develop, evaluate and use new radiogenic isotopic proxies for paleoceanographic and paleoclimatic reconstructions at submillennial resolution. The FeMn oxyhydroxide fraction in marine pelagic sediments is an ideal archive for this purpose because seawaterderived trace metals such as neodymium (Nd), hafnium (Hf) and lead (Pb) can be chemically extracted from this fraction. This archive was already successfully used in earlier studies for the reconstruction of the seawater Nd isotope evolution in the South Atlantic, but no such record at submillennial resolution exists for the North Atlantic. For Hf and Pb isotopes, not a single record using the FeMn oxyhydroxide fraction exists to date. Especially Hf and Pb isotopes in seawater, however, potentially yield valuable information about shortterm climatic changes, intensity of glaciation and the prevailing weathering regime on the continents. Therefore, using seawaterderived Hf and Pb isotopes in conjunction with Nd isotopes from the same seawaterderived fraction allow determining the provenance of a water mass and the climatic conditions prevailing at the continental source area.
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