Zirconium concentration ocean

Group 4 elemental profiles in the ocean are shown in Fig. 12.6. Titanium (Ti), zirconium (Zr) and hafnium (Hf) exhibit substantial covariance in their distributions, and the correspondence between Zr and Hf is particularly close. In the Atlantic Ocean, Zr/Hf concentration ratios (Godfrey et at., 1996) generally range between 170 and 240. 

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