Early Lunar Magnetism

Details Early Lunar Magnetism Early Lunar Magnetism

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sci...323..356g&link_type=abstract

Science, Volume 323, Issue 5912, pp. 356- (2009).

Mathematics

Logic

38

Scientific paper

It is uncertain whether the Moon ever formed a metallic core or generated a core dynamo. The lunar crust and returned samples are magnetized, but the source of this magnetization could be meteoroid impacts rather than a dynamo. Here, we report magnetic measurements and 40Ar/39Ar thermochronological calculations for the oldest known unshocked lunar rock, troctolite 76535. These data imply that there was a long-lived field on the Moon of at least 1 microtesla ~4.2 billion years ago. The early age, substantial intensity, and long lifetime of this field support the hypothesis of an ancient lunar core dynamo.

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