4.8 Article

Seismological expression of the iron spin crossover in ferropericlase in the Earth's lower mantle

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Summary: For regular materials, increasing pressure leads to a linear relationship between shear modulus (G), bulk modulus (K) and pressure (p), but with deviations in iron bearing minerals due to a spin crossover effect. As temperature increases, the spin transition is expected to smooth out along a mantle geotherm. The slight change in modulus ratio and scaled pressure around 1550 km depth suggests a residual effect of a 3-D averaged spin transition in the ferropericlase component of the lower mantle.

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