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MARINE GEOLOGY and GEOPHYSICS

机译：海洋地质和地球物理学

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The effect of pressure on grain-growth kinetics of olivine was investigated up to 10 GPa at 1773 K under relatively water-poor conditions. The results are interpreted using a relation (Formula presented.) to obtain the activation volume (Formula presented.) = 5.0 + 1.1 cm~3/mol for n = 2 or (Formula presented.) = 5.2+ 1.1 cm~3/mol forn = 3. The small activation volume means that grain-growth kinetics in pure olivine aggregates is fast even in the dry deep upper mantle, implying that grain-size is controlled by the pinning by other phases or by dynamic recrystallization except for the early stage after the phase transformation from wadsleyite in upwelling materials. The present results are applied to seismic wave attenuation that is likely controlled by grain-boundary processes. The inferred peak in attenuation just below the oceanic lithosphere-asthenosphere boundary from the NoMelt array is difficult to be explained by the pressure effects assuming the absorption band behavior because such a model requires a much larger activation volume than determined in this work and it also fails to explain high attenuation in the deep asthenosphere. This suggests that either melt accumulation or other processes such as elastically accommodated grain-boundary sliding (EAGBS) is responsible for the peak in attenuation. The present results are also applied to EAGBS. We suggest that the deep upper mantle is likely to be relaxed by EAGBS, which implies that the shear velocity of the deep upper mantle can be several percent smaller than that inferred from single crystal elasticity.
机译：在相对较低的条件下，在1773K下，在1773k中研究了橄榄石籽粒生长动力学的影响。使用关系（所示的公式）解释结果以获得活化体积（所示的公式。）= 5.0 + 1.1cm〜3 / mol的N = 2或（所示的公式。）= 5.2+ 1.1cm〜3 / mol Forn = 3.小的活化体积意味着纯橄榄石聚集体中的晶粒生长动力学即使在干燥的深层地幔中也很快，这意味着除了早期的循环或通过动态再结晶来控制晶粒尺寸从六濑甲矿以升值材料转换后。本结果应用于可能由晶界过程控制的地震波衰减。由于吸收带行为的压力效应，难以解释从游览阵列的海洋岩石圈的衰减中的推断峰值，因为这种模型需要比在这项工作中确定的更大较大的激活量，并且它也失败了解释深度深度深度的高衰减。这表明熔体积累或其他过程，例如弹性容纳的晶界滑动（EAGBS）是衰减中的峰值的原因。目前的结果也适用于EAGBS。我们建议深层地幔可能被EAGBS放松，这意味着深度上部地幔的剪切速度可以比从单晶弹性推断的较小百分点。

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    《Oceanographic Literature Review》 |2021年第4期|773-774|共2页
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