Dausmann, Veit (2018) Present and past changes in continental weathering and ocean circulation from radiogenic Nd, Hf and Pb isotopes. (PhD/ Doctoral thesis), Christian-Albrechts-Universität, Kiel, V, 175 pp.

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Abstract

The past and present variability of ocean circulation and weathering inputs can be reconstructed from the geochemical composition of seawater and marine sediments. Among other proxies, the radiogenic isotope compositions of neodymium (Nd), hafnium (Hf) and lead (Pb) have been applied to reliably trace variations in the ocean that have been related to climate change. However, not all mechanisms and processes governing the geochemical cycling and redistribution of these isotopes are understood in sufficient detail. In order to improve the understanding of some of these mechanisms, the subject of the studies presented in this thesis are the evolution of the radiogenic isotopes of Nd, Hf and Pb in the hydrosphere from the first release into solution during continental weathering via the cycling in present day seawater to the marine sediments, where the information about variations in past ocean circulation and weathering inputs is stored.

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