Oxygen Fugacities Directly Measured in Magmatic Gases

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Abstract
An electrochemical device was used to measure the fugacity of oxygen ( f O 2 ) in holes drilled through the crust of Makaopuhi lava lake, Kilauea Volcano, Hawaii. Results obtained within 6 months of the lake formation show that log f O 2 normally varies linearly with the reciprocal of the absolute temperature, and that chemical changes occurring in the cooling tholeiitic basalt are reflected in the f O 2 values measured in the holes.