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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Seismological evidence for thermo-chemical heterogeneity in Earth's continental mantle
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Seismological evidence for thermo-chemical heterogeneity in Earth's continental mantle

机译：地球大陆地幔中热化学异质性的地震证据

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摘要

Earth's thermo-chemical structure exerts a fundamental control on mantle convection, plate tectonics, and surface volcanism. There are indications that mantle convection occurs as an intermittent-stage process between layered and whole mantle convection in interaction with a compositional stratification at 660 km depth. However, the presence and possible role of any compositional layering in the mantle remains to be ascertained and understood. By interfacing inversion of a novel global seismic data set with petrologic phase equilibrium calculations, we show that a compositional boundary is not required to explain short- and long-period seismic data sensitive to the upper mantle and transition zone beneath stable continental regions; yet, radial enrichment in basaltic material reproduces part of the complexity present in the data recorded near subduction zones and volcanically active regions. Our findings further indicate that: 1) cratonic regions are characterized by low mantle potential temperatures and significant lateral variability in mantle composition; and 2) chemical equilibration seems more difficult to achieve beneath stable cratonic regions. These findings suggest that the lithologic integrity of the subducted basalt and harzburgite may be better preserved for geologically significant times underneath cratonic regions. (c) 2020 Elsevier B.V. All rights reserved.
机译：地球的热化学结构对地幔对流，板块构造和表面火山施加了根本控制。存在迹象表明，在660km深度的相互作用中的分层和整个地幔对流之间的间歇性阶段过程中发生偶然阶段的过程。然而，任何组合物层在地幔中的存在和可能的作用仍有待确定和理解。通过用岩石相均衡计算的新型全球地震数据集的反演，我们表明不需要构成边界来解释稳定的大陆区域下面的上部地幔和过渡区敏感的短期和长期地震数据;然而，玄武岩材料中的径向富集再现存在于俯冲区域附近的数据中存在的复杂性的一部分。我们的研究结果进一步表明：1）裂隙区域的特征在于低搭式潜在温度和地幔组合物的显着横向变异性; 2）化学平衡似乎更难以实现稳定的克拉内地区。这些研究结果表明，在克拉内地区下面的地质上有很大倍增时，可以更好地保存桥面玄武岩和哈尔茨堡的岩性完整性。 （c）2020 Elsevier B.v.保留所有权利。

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