Other
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmgp22a..04h&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #GP22A-04
Other
1521 Paleointensity, 1540 Rock And Mineral Magnetism, 6022 Impact Phenomena, 6055 Surfaces And Interiors, 6250 Moon (1221)
Scientific paper
Lunar Prospector (LP) electron reflectometer data indicate a variety of magnetic signatures associated with lunar impact sites, ranging from nearly complete demagnetization signatures to central magnetic anomalies. Smaller impact craters (D < ˜150 km) of all ages show evidence of demagnetization, with a higher percentage of younger craters displaying clear symmetric demagnetization signatures. Among larger impact structures, those of Imbrian and younger age still tend to show demagnetization, while older impact sites of Nectarian and Pre-Nectarian age often have central magnetic anomalies (sometimes superimposed upon a larger demagnetized region) with peak fields ranging from a few nanotesla to ˜100 nT. Most demagnetization signatures extend beyond the main rim of the visible impact structure, sometimes to a distance of several main rim radii. Consideration of the peak shock pressures produced by impacts indicates that most of the demagnetized region should not be heated above the Curie point, therefore indicating the importance of shock demagnetization in producing the observed demagnetization signatures. Central magnetic anomalies, on the other hand, tend to lie inside the transient cavity region of larger impact structures, suggesting that these features could be produced by thermal remanence in impact melt rocks, shock remanence in the highly shocked central uplift regions, or a combination thereof. Careful analyses of magnetic features associated with lunar impact sites, and comparison with terrestrial data from both laboratory experiments and field work, can be used to constrain the age history and physical characteristics of lunar remanent magnetism.
Halekas Jasper S.
Lin Robert P.
Mitchell David Leroy
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