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Anomalous Behavior of Zirconium and Hafnium in Volcanic Fumarolic Fluids

Abstract : The Zirconium and Hafnium concentrations in worldwide fumaroles fed by magmatic fluids reveal that the Zr/Hf ratio is inversely related to the temperature of emission. Lower Zr/Hf ratio values below the chondritic signature are found in fluids having the highest temperature while super-chondritic Zr/Hf ratio values are found in lower temperatures. Sub-chondritic values of the Zr/Hf ratio may be related to larger volatility of Hf-chloride gas species with respect to Zr-Cl gas species, while super-chondritic ratios may correspond to fluid-rock processes resulting from cooling of uprising magmatic fluids. We propose that sub-chondritic Zr/Hf ratio values in fumaroles associated with high temperature may be an appropriate marker of fast magmatic rising representing a new sensitive tool for volcanic risks strategies.
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Submitted on : Friday, August 5, 2022 - 11:55:58 AM
Last modification on : Sunday, August 7, 2022 - 3:43:41 AM

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P. Censi, P. Zuddas, A. Caracausi, F. Sortino, M. Cangemi, et al.. Anomalous Behavior of Zirconium and Hafnium in Volcanic Fumarolic Fluids. Geophysical Research Letters, 2022, 49, ⟨10.1029/2021GL094674⟩. ⟨insu-03746431⟩

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