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High-Pressure Geoscience Special Feature: Seismological support for the metastable superplume model sharp features and phase changes within the lower mantle

机译:高压地球科学特色:对亚稳态超胶体模型的地震学支持下地幔内的鲜明特征和相变

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摘要

Recently, a metastable thermal-chemical convection model was proposed to explain the African Superplume. Its bulk tabular shape remains relatively stable while its interior undergoes significant stirring with low-velocity conduits along its edges and down-welling near the middle. Here, we perform a mapping of chemistry and temperature into P and S velocity variations and replace a seismically derived structure with this hybrid model. Synthetic seismogram sections generated for this 2D model are then compared directly with corresponding seismic observations of P (P, PCP, and PKP) and S (S, SCS, and SKS) phases. These results explain the anticorrelation between the bulk velocity and shear velocity and the sharpness and level of SKS travel time delays. In addition, we present evidence for the existence of a D” triplication (a putative phase change) beneath the down-welling structure.
机译:最近,提出了一种亚稳态热化学对流模型来解释非洲超级肥肉。它的大块板状形状保持相对稳定,而内部则受到沿其边缘的低速导管的搅动,并在中部附近向下凹陷。在这里,我们将化学和温度映射到P和S速度变化中,并用此混合模型替换地震衍生的结构。然后将为此2D模型生成的合成地震图剖面直接与P(P,PCP和PKP)和S(S,SCS和SKS)相的相应地震观测值进行比较。这些结果说明了体速度和剪切速度与SKS传播时间延迟的锐度和水平之间的反相关性。此外,我们提供了在井下结构下方存在D”重复(推定相变)的证据。

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