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Seismic tomography and geochemical evidence for lunar mantle heterogeneity: Comparing with Earth

机译：月球地幔非均质性的地震层析成像和地球化学证据：与地球比较

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摘要

We present seismic tomography and geochemical evidence for the existence of significant lateral heterogeneities in the lunar mantle and make a comparison with the Earth's heterogeneity and seismicity. The Procel-Iarum KREEPTerrane (PKT) is a unique province on the nearside of the Moon. It constitutes only about 15% or less of the lunar surface, but appears to owe a large portion of the Moon's radioactive heat-producing elements. We found a correlation between the Thorium (Th) abundance distribution and seismic tomography of the lunar nearside. The area with high Th abundance exhibits a distinct low shear-wave velocity, and the low-velocity anomaly extends down to 300-400 km depth below the PKT, suggesting that the thermal and compositional anomaly has a depth extent of 300-400 km in the lunar mantle. The distribution of deep moonquakes shows a correlation with the seismic-velocity variations in the deep lunar mantle, similar to the earthquakes which are affected or controlled by structural heterogeneities in the terrestrial crust and upper mantle. The presence of deep moonquakes and seismic-velocity heterogeneities in the mantle implies that the interior of the present Moon may be still thermally active.
机译：我们提供了月球地幔中存在明显的横向非均质性的地震层析成像和地球化学证据，并与地球的非均质性和地震性进行了比较。 Procel-Iarum KREEPTerrane（PKT）是位于月球附近的独特省份。它只占月球表面的约15％或更少，但似乎欠月亮的大部分放射性生热元素。我们发现the（Th）的丰度分布与月球近侧地震层析成像之间的相关性。 Th丰度高的区域表现出明显的低剪切波速度，并且低速异常一直延伸到PKT下方300-400 km深度，这表明热和成分异常的深度范围为300-400 km。月球幔。深地震的分布显示出与月球深部地震动速度变化的相关性，类似于受地壳和上地幔结构异质性影响或控制的地震。地幔中存在深层地震和地震速度非均质性意味着当前月球内部可能仍处于热活跃状态。

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