Journal
EARTH AND PLANETARY SCIENCE LETTERS
Volume 404, Issue -, Pages 89-97Publisher
ELSEVIER
DOI: 10.1016/j.epsl.2014.07.010
Keywords
Moon; core dynamo; paleomagnetism; planetary magnetism
Categories
Funding
- NASA Lunar Advanced Science and Exploration Research Program [NNX08AY96G]
- People Programme (Marie Curie Actions) of the European Union under Research Executive Agency [298355]
- Ann and Gordon Getty Foundation
- NSF Graduate Research Fellowship [1122374]
- NASA Earth and Space Science Fellowship [NNX08BA18H]
- NASA [NNX08AY96G, 92060, NNX08BA18H, 90677] Funding Source: Federal RePORTER
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Recent analyses of Apollo samples have demonstrated that a core dynamo existed on the Moon between at least 4.25 and 3.56 billion years ago (Ga) with surface field intensities reaching similar to 70 mu T. However, it is unknown when the Moon's magnetic field declined. Determining the temporal evolution of the dynamo is important because it constrains secular changes in power at the lunar core-mantle boundary and, by implication, the Moon's thermal and orbital evolution and the field generation mechanism. Here we present paleomagnetic data from several younger mare basalts which demonstrate that the surface magnetic field had declined precipitously to
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