On the question of the Ar-40 excess in lunar soils

Details On the question of the Ar-40 excess in lunar soils On the question of the Ar-40 excess in lunar soils

Mar 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977rspta.285..385s&link_type=abstract

(Royal Society, Discussion on the Moon - A New Appraisal from Space Missions and Laboratory Analyses, London, England, June 9-12

Physics

2

Argon Isotopes, Feldspars, Lunar Soil, Olivine, Abundance, Lunar Evolution, Lunar Magnetic Fields, Potassium, Pyroxenes, Trapping

Scientific paper

The retrapping mechanism proposed to explain the excess Ar-40 in lunar soil samples is discussed. Questions arise from the following experimental facts. Gas release in linear heating experiments is similar for excess Ar-40 and for solar-wind Ar-36, the latter having much higher implantation energy. In feldspar and olivine-pyroxene separates from a lunar soil, the Ar-40/Ar-36 ratio of surface-correlated argon is different. In feldspar grain-size separates, potassium and Ar-36 appear linearly correlated. Possible influences of the moon's ancient magnetic properties on the efficiency of the retrapping mechanism are discussed. Arguments supporting the notion of a second process, the transient K coating, are presented. The problem remains unsettled, and further studies are needed.

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