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Authors: Zuddas, P.* 
Inguaggiato, C.* 
Censi, P.* 
D'Alessandro, W.* 
Title: Zr- Hf fractionation during Water-Rock Interaction
Issue Date: 16-Oct-2016
Publisher: Elsevier - Procedia Earth and Planetary Science vol. 17
DOI: 10.1016/j.proeps.2016.12.179
Keywords: Zr/Hf ratio
natural waters
Subject Classification03. Hydrosphere::03.04. Chemical and biological::03.04.03. Chemistry of waters 
03. Hydrosphere::03.04. Chemical and biological::03.04.06. Hydrothermal systems 
Abstract: Zr and Hf are two elements having same ionic charge and similar ionic size at a given coordination number. Despite the Zr/Hf ratio is considered to be quite constant in meteorites and lithospheric rocks, seawaters collected from the surface down to varying depths of several Pacific Ocean stations reveal that the Zr/Hf ratio increases by one order of magnitude. Very recent studies have shown that, in both ground waters and lake waters, the Zr/Hf ratio is either higher or lower compared to the interacting minerals displaying a large variability in the distribution of these twin elements. In this communication the possible processes responsible for such a large fractionation are discussed but further work is needed to test the validity of these interpretations. This basic problem of scientific significance needs more attention from the water-rock interaction community.
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