Fractionation of the geochemical twins Zr–Hf and Nb–Ta during scavenging from seawater by hydrogenetic ferromanganese crusts

• Published in: Geochimica et cosmochimica acta Vol. 140; pp. 468 - 487
• Main Authors: Schmidt, Katja, Bau, Michael, Hein, James R., Koschinsky, Andrea
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.09.2014
• Subjects: Crusts; Geochemistry; Hafnium; Iron; Niobium; Sea water; Tantalum; Zirconium

In contrast to igneous systems, the geochemical twins Zr and Hf are decoupled from each other in seawater, and specific Zr/Hf ratios appear to be characteristic of individual marine water masses. Hydrogenetic marine ferromanganese (Fe–Mn) crusts which accumulate trace metals from seawater may be an...