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In this paper the method of estimation of partial oxygen pressure (Po_2) associated with lave is reconsidered on the thermodynamic bases, and some results of experiment to know how Na ion in lave has ...an effect on the Fe^〈+3〉-Fe^〈+2〉-O^〈-2〉 equilibrium are reported. It is explicit that each lava has its own equilibrium constant of iron redex reactions. Fe^〈+3〉 is more stable than Fe^〈+2〉 with rising temperature in sodium glass and alkalirhyolite at air atmosphere.. This is opposite to normal state which Fe^〈+2〉 is more stable than Fe^〈+3〉 with rising temperature. Besides, the geologic "Po_2-barometer" of olivine and pyroxene is discussed to estimate the oxygen partial pressure associated with lava.続きを見る
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Mendeley出力
18_02_p367