Fluorine and chlorine behavior in chlorine-rich volcanic rocks from White Island, New Zealand |
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| Authors: | Katsuro Anazawa C Peter Wood Patrick RL Browne |
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| Institution: | aGeothermal Institute, The University of Auckland, Private Bag 92019, Auckland, New Zealand;bInstitute of Geological and Nuclear Sciences, Wairakei Research Centre, Private Bag 2000, Taupo, New Zealand;cInstitute of Earth Sciences and Engineering, The University of Auckland, Private Bag 92019, Auckland, New Zealand |
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| Abstract: | Extraordinarily high chlorine-bearing volcanic bombs were erupted from White Island volcano on January 25, 1987. The concentrations of fluorine and chlorine were measured in these paralava bombs and their likely parent rocks. The paralavas contain glass with over 1.0 wt.% and up to 1.7% of chlorine. The F/Cl ratios and their relationship with other constituents show that the fluorine and chlorine in the bombs were derived from hydrothermal fluid, most likely concentrated brine in an active Crater Pool. |
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| Keywords: | Ion chromatography Chlorine Hydrothermal system Volcanic rock Paralava White Island |
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