Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgre..11205008a&link_type=abstract
Journal of Geophysical Research, Volume 112, Issue E5, CiteID E05008
Physics
4
Planetary Sciences: Solid Surface Planets: Interiors (8147), Planetary Sciences: Solid Surface Planets: Magnetic Fields And Magnetism, Planetary Sciences: Solid Surface Planets: Tectonics (8149), Planetary Sciences: Solid Surface Planets: Volcanism (6063, 8148, 8450), Planetary Sciences: Solid Surface Planets: General Or Miscellaneous
Scientific paper
This paper examines the magnetization that can be acquired by the lower crust of Mars in the absence of a core field but in the presence of the magnetic field of the upper crust that is magnetized by the core field. A uniformly magnetized vertical prism of a square horizontal cross section is considered to be a magnetic source in the upper crust for simplicity. Three thicknesses of 40, 60, and 80 km and six horizontal dimensions of 180, 300, 600, 900, 1200, and 1500 km are considered for the prism. To estimate the upper limit for the contribution of the lower crust to the observed magnetic anomalies, a potentially magnetic layer of 100 km thickness is adopted. Coarse-grain hematite is uniformly distributed in the lower crust with 4, 10, 20, or 30% concentration of hematite. The first is equivalent to the oceanic extrusive basalt as far as its thermo-remanent magnetization (TRM) is concerned. It is shown that the magnetization of the lower crust has minor effects on the strong magnetic anomalies of Mars over the southern hemisphere. However, if the lower crust has 20 to 30% coarse-grain hematite, which is highly unlikely, it may have appreciable contributions to small magnetic anomalies of Mars with horizontal dimensions smaller than 200 km.
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