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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 >Seismic evidence for a rapidly varying compositional anomaly at the base of the Earth's mantle beneath the Indian Ocean
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Seismic evidence for a rapidly varying compositional anomaly at the base of the Earth's mantle beneath the Indian Ocean

机译：地震证据表明印度洋下方地幔底部的成分异常迅速变化

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摘要

Seismic observations recorded by an African seismic array reveal a low velocity anomaly at the base of the mantle beneath the Indian Ocean, with steeply dipping edges, rapidly varying thicknesses and geometries, and anomalously low shear wave velocities decreasing from -2% at 200 km above the core-mantle boundary to -9% to -12% at the coremantle boundary (relative to the preliminary reference Earth model). these characteristics unambiguously suggest that it is a compositional anomaly and its velocity structures can be well explained by partial melt driven by a compositional change produced early in the Earth's history. This chemical anomaly geographically coincides with the DUPAL geochemical anomaly observed in island volcanoes around the Indian Ocean and may provide an explanation for its distinctive isotope characteristics observed at the Earth's surface.
机译：非洲地震阵列记录的地震观测结果显示，印度洋下方地幔底部存在低速异常，边缘倾角陡峭，厚度和几何形状迅速变化，并且异常低剪切波速度从高于200 km时的-2％降低相对于初步参考地球模型，在核心层边界处的核心层边界为-9％到-12％。这些特征清楚地表明这是一个组成异常，其速度结构可以通过地球历史早期产生的组成变化驱动的部分熔体很好地解释。这种化学异常在地理上与在印度洋周围的岛屿火山中观测到的DUPAL地球化学异常相吻合，并可能为在地球表面观测到的独特同位素特征提供了解释。

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