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铁是硅酸盐熔体中最重要的变价元素,对岩浆的物理和化学性质起着重要作用。三价铁和总铁的比例(Fe~(3+)/ΣFe)反映了岩浆过程中的氧化还原状态。Fe3+/ΣFe不仅直接受氧逸度控制,而且还受化学成分、温度和压力的影响。本研究通过实验岩石学的方法探讨硅酸盐熔体中铁的结构变化以及Fe3+/ΣFe与压力之间的关系,进而对早期岩浆海的氧化还原环境进行模拟,从而对早期大气的组成进行制约。Fe3+/ΣFe比值可以通过穆斯堡尔谱以及X-射线吸收近边结构(XANES)进行测量,其中穆斯堡尔
Iron is the most important variable element in silicate melts and plays an important role in the physical and chemical properties of magmas. The ratio of ferric iron to total iron (Fe ~ (3 +) / ΣFe) reflects the state of redox in magma. Fe3 + / ΣFe not only directly by the oxygen fugacity control, but also by the chemical composition, temperature and pressure. In this study, we investigated the structural change of Fe in silicate melt and the relationship between Fe3 + / ΣFe and pressure through experimental petrology, and then simulated the redox environment of the early magmatic sea, so as to constrain the composition of the early atmosphere. The Fe3 + / ΣFe ratio can be measured by Mossbauer spectroscopy and X-ray absorption near-edge structures (XANES), of which Mossburg