Other
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmgp24a..01g&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #GP24A-01
Other
6250 Moon (1221), 1510 Dynamo: Theories And Simulations, 1533 Remagnetization, 1595 Planetary Magnetism: All Frequencies And Wavelengths
Scientific paper
One of the biggest mysteries remaining from the Apollo era has been the origin of magnetization in lunar rocks. It is difficult to explain how a body as small as the Moon could have generated a magnetic field of sufficient intensity and duration to account for the magnetization in lunar rocks. Available data suggest that the onset of the putative lunar dynamo was delayed until 3.9 Ga, which might be at odds with an origin of the Moon by giant impact. Furthermore, magnetization in essentially zero-age lunar glasses seems to suggest that a lunar dynamo operated on the Moon up until very recently. These and other observations have led many to question the fidelity with which lunar rocks record ancient magnetic fields on the Moon. A clear concern is that thermal cycling on the lunar surface may have significantly demagnetized any such ancient magnetization. Consequently, it has been proposed that lunar rock magnetism is at least partly the product of viscous magnetization by more recent magnetic fields like those from the spacecraft and Earth. Here we present quantitative time-temperature relations for remagnetization of kamacite (Fe1-xNix for x < 0.10) which show that much of the magnetization in ancient Apollo samples and spacecraft-detected anomalies is thermally stable over billions of years and likely originated on the surface of the Moon. Use of these relations in context with a rock's inferred thermal history will ensure the reliability of future magnetism studies.
Garrick-Bethell Ian
Weiss Benjamin P.
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