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| DOI | 10.1016/j.epsl.2021.116808 |
| The relative behaviour of bulk and shear modulus as an indicator of the iron spin transition in the lower mantle | |
| Kennett B.L.N. | |
| 发表日期 | 2021 |
| ISSN | 0012821X |
| 卷号 | 559 |
| 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 |
| 关键词 | bulk modulusdeep EarthEarth modelsshear modulusspin 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 |
| 语种 | 英语 |
| 来源期刊 | Earth and Planetary Science Letters
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/203160 |
| 作者单位 | Research School of Earth Sciences, The Australian National University, Canberra ACT, 2601, Australia |
| 推荐引用方式 GB/T 7714 | 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],2021,559. |
| APA | Kennett B.L.N..(2021).The relative behaviour of bulk and shear modulus as an indicator of the iron spin transition in the lower mantle.Earth and Planetary Science Letters,559. |
| MLA | Kennett B.L.N.."The relative behaviour of bulk and shear modulus as an indicator of the iron spin transition in the lower mantle".Earth and Planetary Science Letters 559(2021). |
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