Magnetic coercivity and intensity of Mars crust: Dichotomy formation via unicellular convection mechanism

Details Magnetic coercivity and intensity of Mars crust: Dichotomy formation via unicellular convection mechanism Magnetic coercivity and intensity of Mars crust: Dichotomy formation via unicellular convection mechanism

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmgp43a0884k&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #GP43A-0884

Physics

1517 Magnetic Anomalies: Modeling And Interpretation, 1518 Magnetic Fabrics And Anisotropy, 1519 Magnetic Mineralogy And Petrology, 5440 Magnetic Fields And Magnetism, 5499 General Or Miscellaneous

Scientific paper

Intense magnetic anomalies over the Mars surface indicate that during the early history of Mars large portions of Mars crust formed in the presence of global magnetic field. Distribution of the magnetic anomalies can be divided into three zones. Zone 1 is where the magnetic signature is negligible or of low intensity. Zone 2 is the region of intermediate crustal anomalies and Zone 3 is where there are magnetic anomalies of extreme magnetic intensity. Crater demagnetization behavior suggests that at least part of the Zone 3 located near the South Pole is generated by rocks with large magnetic coercivity. TRM analyses with terrestrial rocks suggest that compositional banding significantly enhances the TRM intensity. Both magnetic coercivity and intensity values near the South pole suggest presence of a deformation and compositional zoning of the rock in the Mars crust. This can be most simply explained by contractional deformation due to density contrasts above the down welling zone at the South Pole and formation of new crust above the upwelling zone at the North pole.

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