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玄武岩中云母为金云母,其余皆为金云母到镁黑云母之间的一种特别富Mg的黑云母。在这些黑云母中MgO、TiO_2、Fe_2O_3含量明显偏高,而Al_2O_3和FeO较低。穆斯堡尔谱研究说明这些黑云母的Fe~(2+)四极分裂值比一般黑云母的小(Fe~(2+)Mz为2.35)。黑云母结晶时氧逸度较高,并保存了母岩浆SiO_2高和Al_2O_3低的特点,喷出时受到高温氧化作用的影响。
The basaltic mica is phlogopite, and the rest are a particularly rich Mg-rich biotite from phlogopite to magnesia biotite. In these biotite, the content of MgO, TiO_2, Fe_2O_3 is obviously higher, while the content of Al_2O_3 and FeO is lower. Mossbauer spectroscopy study shows that these biotite Fe2 + quadrupole splitting value than the average biotite (Fe2Mz) 2.35). When the biotite is crystallized, the oxygen fugacity is high, and the characteristics of the parent magma SiO 2 high and Al 2 O 3 low are preserved, which are affected by the high-temperature oxidation upon ejection.