globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116808
论文题名:
The relative behaviour of bulk and shear modulus as an indicator of the iron spin transition in the lower mantle
作者: Kennett B.L.N.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 559
语种: 英语
中文关键词: bulk modulus ; deep Earth ; Earth models ; shear modulus ; spin transition
英文关键词: Elastic moduli ; Iron ; Minerals ; Shear strain ; Spin dynamics ; Earth structures ; High spin state ; Increasing temperatures ; Iron-bearing minerals ; Linear relation ; Residual effects ; Spin crossovers ; Spin transition ; Shear flow ; body wave ; bulk modulus ; iron ; mantle source ; mineral resource ; rock mechanics ; shear modulus ; temperature profile ; transition zone ; Indicator indicator
英文摘要: For a regular material, in a single state, the effect of increasing pressure is to produce a linear relation between shear modulus (G), bulk modulus (K) and pressure (p). Such a dependence on pressure fits the behaviour of individual mineral and mineral composites well. For the iron bearing minerals in the lower mantle, the transition from the high-spin state to the low-spin state with increasing pressure produces deviations from this simple behaviour, due to a much larger reduction of the bulk modulus than the shear modulus in the spin crossover. There are linear zones in the dependence of the modulus ratio G/K on pressure scaled by bulk modulus (p/K) above and below the transition, with a complex excursion to high ratios in between. With increasing temperature the spin transition is smoothed out in depth, and is expected to be smooth along a mantle geotherm. For the ak135 body-wave model of radial Earth structure there is a slight, but distinct, change of slope in the relation between the modulus ratio and scaled pressure corresponding to a depth range around 1550 km. This feature is strongly suggestive of a residual effect of a 3-D averaged spin transition in the ferropericlase component of the lower mantle. © 2021
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165538
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作者单位: Research School of Earth Sciences, The Australian National University, Canberra ACT, 2601, Australia

Recommended Citation:
Kennett B.L.N.. The relative behaviour of bulk and shear modulus as an indicator of the iron spin transition in the lower mantle[J]. Earth and Planetary Science Letters,2021-01-01,559
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