An indigenous origin for the South Pole Aitken basin thorium anomaly

Details An indigenous origin for the South Pole Aitken basin thorium anomaly An indigenous origin for the South Pole Aitken basin thorium anomaly

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3213203g&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 13, CiteID L13203

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7

Planetary Sciences: Solid Surface Planets: Composition (1060, 3672), Planetary Sciences: Solid Surface Planets: Interiors (8147), Planetary Sciences: Solar System Objects: Moon (1221)

Scientific paper

The northwest portion of the Moon's South Pole-Aitken basin contains an anomalously high abundance of thorium as determined by Apollo and Lunar Prospector gamma-ray spectroscopy. The anomaly's proximity to the antipode of the Imbrium basin has led several investigators to suggest that the anomaly is the result of convergence of thorium-enriched ejecta from the Imbrium impact. Examination of this complex region with new higher-resolution thorium data and several other datasets reveals that a convergence of ejecta cannot explain the anomaly. Alternatively, we propose an indigenous and likely ancient source.

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