氧逸度（fO2）就是有效的氧分压。氧分压是指混合气体总压之下的氧的分压力，以PO2表示。
目前，某些研究者推出几种流体包裹体的氧逸度计算公式和相应的图表。
At present several formulae for calculating oxygen fugacities on the basis of fluid inclusion da-ta and corresponding diagrams and tables have been proposed by some researchers.
认为形成这一类型矿床的流体是一种高氧逸度、高硫逸度的中低温酸性流体。
It is concluded that the fluid forming this type of copper-gold deposit is one high oxygen and sulphur fugacity and low-to-moderate temperature acid fluid.
但在高位岩浆房中，随着分离结晶作用的进行，岩浆的温度和氧逸度逐渐降低。
However, the temperatures and oxygen fugacity of magmas at high level magma chamber decreased along with fractional crystallization.
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