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当存在CO_2气体时,用热力学观点,对钛铁矿和钛磁铁矿的稳定性作了评价.当温度大于270℃、压力为1,000巴和温度大于300℃、压力为2,000巴时,含钛铁矿_90赤铁矿_10组分的钛铁矿分解成菱铁矿-赤铁矿-锐钛矿集合体.当压力为1,000巴、温度大于345℃,以及压力为2,000巴、温度大于385℃时,含钛尖晶石_50磁铁矿_50组分的钛磁铁矿分解成与上述相同的集合体.在玄武质岩类的低级变质作用过程中,只需几百巴的CO_2分压力,就足以把钛铁矿和钛磁铁矿改造成菱铁矿-赤铁矿-锐钛矿集合体.
The stability of ilmenite and titanomagnetite was evaluated thermodynamically in the presence of CO 2 gas.When the temperature was above 270 ° C and the pressure was 1,000 bar and the temperature was above 300 ° C and the pressure was 2,000 bar, Iron Ore_90 Hematite_10 The ilmenite is decomposed into siderite - hematite - anatase aggregates. When the pressure is 1,000 bar, the temperature is above 345 ° C, and the pressure is 2,000 bar, the temperature is above At 385 ° C, the titanomagnetite containing titanium-spinel-50 magnetite-50 components decomposes into the same assemblages as above, and in the low-grade metamorphism of basaltic rocks only a few hundred bar CO 2 partial pressure, is enough to transform ilmenite and titanium magnetite into siderite - hematite - anatase assembly.