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Experimental study on pumice and obsidian |
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| Authors: | K Yagi |
| Institution: | 1. Department of Geology and Mineralogy, Hokkaido University, Sapporo, Japan 2. Department of Earth and Planetary Sciences, University of Pittsburgh, Pittsburgh, U.S.A. |
| Abstract: | Thermal experiment on the pumice at atmospheric pressure shows that welding begins at about 900° C and complete melting occurs at 1350° C. It is noticed that FeO content of pumice decreases first with increasing temperature, attaining minimum value at 1100° C, and then again increases with increasing temperature. Therefore, an equilibrium is expected in the presence of liquid phase as follows: $$4FeO + O_2 = 2Fe_2 O_3 .$$ |
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