Other
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p23a1238k&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #P23A-1238
Other
[5440] Planetary Sciences: Solid Surface Planets / Magnetic Fields And Magnetism, [5475] Planetary Sciences: Solid Surface Planets / Tectonics
Scientific paper
Many models of the martian magnetic field have been produced since the Mars Global Explorer (MGS) experiment was carried out beginning in 1999. The earlier models clearly showed linear anomalies in the Terra Cimmeria/Sirenum regions and isolated anomalies elsewhere but did not reveal much detail about the global pattern of the anomalies. The most revealing map of martian crustal magnetic anomalies produced to date is the GSFC ΔBr map. This map, representing the mean change of the radial component of the field with latitude, is though to be an excellent proxy for the Bθ component at MGS mapping altitude. The ΔBr map is thought to be largely free of the effects of external field and allows exceptional detail of the magnetic anomalies, particularly in areas of Mars where the field is relatively weak. Hypotheses of the origin of the magnetic anomalies on Mars have included sea floor spreading, hydrothermal alteration, accretion of terranes, magmatic intrusions, and mega-impact. It is well established that the magnetic anomalies on Mars have changed greatly in intensity since the cessation of the core field. For example, the anomalies are weak or non-existent within the large impact basins, and the great volcanoes of Mars have obliterated most traces of former magnetization. In this study we present a structural analysis of lineation patterns derived from the ΔBr magnetic map. Orientation diagrams indicate that the magnetic anomalies of Mars appear to form a concentric multi-ring pattern offset from the present day pole but centered within the Borealis basin. However, several regions of Mars appear to have been rotated to some extent, probably by subsequent tectonic processes.
Kobayashi Daisuke
Sprenke Kenneth F.
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