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

Dapeng Zhao, Tomoko Arai, Lucy Liu, Eiji Otani

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

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 Procellarum KREEP Terrane (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.

Original languageEnglish
Pages (from-to)29-36
Number of pages8
JournalGlobal and Planetary Change
Volume90-91
DOIs
Publication statusPublished - 2012 Jun 1

Keywords

  • Apollo missions
  • Moon
  • Moonquakes
  • Procellarum KREEP Terrane
  • Seismic tomography
  • Thorium abundance

ASJC Scopus subject areas

  • Global and Planetary Change
  • Oceanography

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