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除温度、浓度、压力等外,氧逸度(fO_2)的大小也是重要的物理化学参数之一,在矿物、岩石、矿床以及地球化学等领域中,受到人们的广泛重视,成为天然岩石及实验岩石的重要研究课题之一.对于fO_2,除了用氧探针等手段进行直接测定外.也可利用含变价元素的造岩矿物,对岩浆结晶时的fO_2.条件,进行间接的估算,如利用钛铁氧化物固溶体(USP-Mt,IIm-Hem)组成,利用橄榄石的Fa量,辉石的Fs量,黑云母的含铁量和价态及它们的结晶温度估算fO_2等.
In addition to temperature, concentration and pressure, the size of oxygen fugacity (fO_2) is also one of the important physicochemical parameters. It has been widely considered in the fields of minerals, rocks, deposits and geochemistry to become natural rocks and experiments Rock research is one of the important issues for fO_2, in addition to the use of oxygen probes and other means of direct measurement, but also can be used with variable price element rock minerals, magma crystallization of fO_2 conditions, indirect estimates, such as the use of (USP-Mt, IIm-Hem) composition, the use of olivine Fa amount, Fs amount of pyroxene, biotite iron content and valence state and their crystallization temperature estimation fO_2 and so on.