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Iron-rich silicates in the Earth's D '' layer

机译:地球的D''层中的富铁硅酸盐

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摘要

High-pressure experiments and theoretical calculations demonstrate that an iron-rich ferromagnesian silicate phase can be synthesized at the pressure-temperature conditions near the core-mantle boundary. The iron-rich phase is up to 20% denser than any known silicate at the core-mantle boundary. The high mean atomic number of the silicate greatly reduces the seismic velocity and provides an explanation to the low-velocity and ultra-low-velocity zones. Formation of this previously undescribed phase from reaction between the silicate mantle and the iron core may be responsible for the unusual geophysical and geochemical signatures observed at the base of the lower mantle.
机译:高压实验和理论计算表明,可以在岩心-地幔边界附近的压力-温度条件下合成富铁的锰铁硅酸盐相。富铁相的密度比芯-幔边界的任何已知硅酸盐高20%。硅酸盐的高平均原子数极大地降低了地震速度,并为低速和超低速带提供了解释。由硅酸盐地幔和铁芯之间的反应形成的先前未描述的相可能是在下地幔底部观察到的异常地球物理和地球化学特征的原因。

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