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首页> 外文期刊>The American mineralogist >Elasticity of single-crystal periclase at high pressure and temperature: The effect of iron on the elasticity and seismic parameters of ferropericlase in the lower mantle
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Elasticity of single-crystal periclase at high pressure and temperature: The effect of iron on the elasticity and seismic parameters of ferropericlase in the lower mantle

机译：高压和温度下单晶髓质的弹性：铁对较低地幔中铁锰酶弹性和地震参数的影响

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In this study, we measured the sound velocities of single-crystal periclase by Brillouin light scattering (BLS) combined with in situ synchrotron X-ray diffraction (XRD) up to similar to 30 GPa and 900 K in an externally heated diamond-anvil cell (EHDAC). Our experimental results were used to evaluate the combined effects of pressure and temperature on the elastic moduli of single-crystal periclase using third-order Eulerian finite-strain equations. All of the elastic moduli increased with increasing pressure but decreased with increasing temperature, except the off-diagonal modulus C-12, which remained almost constant up to similar to 30 GPa and 900 K. The derived aggregate adiabatic bulk and shear moduli (K-S0, G(0)) at ambient conditions were 162.8(+/- 0.2) and 130.3(+/- 0.2) GPa, respectively, consistent with literature results. The pressure derivatives of the bulk [(partial derivative K-S/partial derivative P)(300 K)] and shear moduli [(partial derivative G/partial derivative P)(300 K)] at ambient conditions were 3.94(+/- 0.05) and 2.17(+/- 0.02), respectively, whereas the temperature derivatives of these moduli [(partial derivative K-S/partial derivative T)(P) and (partial derivative G/partial derivative T)(P)] at ambient conditions were -0.025(+/- 0.001) and -0.020(+/- 0.001) GPa/K, respectively. A comparison of our experimental results with the high-pressure (P) and high-temperature (T) elastic moduli of ferropericlase (Fp) in the literature showed that all the elastic moduli of Fp were linearly correlated with the FeO content up to approximately 20 mol%. These results allowed us to build a comprehensive thermoelastic model for Fp to evaluate the effect of Fe-Mg substitution on the elasticity and seismic parameters of Fp at the relevant P-T conditions of the lower mantle. Our modeling results showed that both the increase of the Fe content in Fp and the increasing depth could change the compressional wave anisotropy (AV(P)) and shear wave splitting anisotrop
机译：在这项研究中，我们通过在外部加热的金刚石 - 砧座中，通过布里渊光散射（BLS）用布里渊光散射（BLS）通过原位同步散射X射线衍射（XRD）与20GPa和900k相似的单晶蠕变的声速（ehdac）。我们的实验结果用于评估压力和温度对单晶蠕变的综合影响使用三阶欧拉有限应变方程。所有弹性模量随着压力的增加而增加，但随着温度的增加而降低，除了偏离对角线模量C-12，它仍然几乎恒定到类似于30GPa和900k。衍生的聚集体绝热散装和剪切模量（k-在环境条件下S0，G（0））分别是162.8（+/- 0.2）和130.3（+/- 0.2）GPA，与文献结果一致。在环境条件下，体积[（部分衍生物Ks /部分衍生物P）（300k）]和剪切模量[（部分衍生物G /偏衍生物P）（300k）]的压力衍生物为3.94（+/- 0.05）分别为2.17（+/- 0.02），而在环境条件下，这些模量[（部分衍生物Ks /部分衍生物T）（P）和（部分衍生物G /偏衍生物T）（P）]的温度衍生物是 - 0.025（+/- 0.001）和-0.020（+/- 0.001）GPA / k。我们在文献中与高压（P）和高温（FP）的高压（P）和高温（T）弹性模态的实验结果的比较表明，FP的所有弹性模量与FEO含量线性相关，高达约20摩尔％。这些结果使我们能够为FP构建一个综合的热弹性模型，以评估Fe-Mg取代对下披露的相关P-T条件下FP的弹性和地震参数的影响。我们的建模结果表明，FP中的Fe含量的增加和越来越深度的增加可能会改变压缩波各向异性（AV（P））和剪切波分裂鸟类

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