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磁铁矿Fe_3O_4是前震旦纪含铁石英岩的主要金属氧化物之一。因此对磁铁矿中氧同位素组成的研究,有利于进一步解决前震旦纪含铁石英岩的成因问题。 磁铁矿中氧的提取我们采用五氟化溴法。氧同位素分析结果以δO~(18)‰表示。δ值表示分析样品与工作标准之间O~(18)/O~(16)比的千分偏差。如下式所示:
Magnetite Fe_3O_4 is one of the major metal oxides of pre-Sinian iron-bearing quartzite. Therefore, the study of the oxygen isotopic composition of magnetite is conducive to further solve the genetic problem of pre-Sinian iron-bearing quartzite. Oxygen extraction from magnetite We use the bromine pentafluoride method. Oxygen isotope analysis results to δO ~ (18) ‰ said. The δ value represents the thousandth deviation of the O 18 / O 16 ratio between the analytical sample and the working standard. As shown below: