On the paleomagnetic pole positions of Mars

Details On the paleomagnetic pole positions of Mars On the paleomagnetic pole positions of Mars

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....13952b&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #13952

Computer Science

Scientific paper

Before indulging in detailed modeling of the strong and complex magnetic anomalies of Mars, it is desirable to estimate the magnetization direction of their source bodies. The interpretation of the satellite magnetic anomalies of the Earth is facilitated because major magnetic anomalies arise from strong magnetic sources in the lower crust that are induced magnetized at the presence of the core field, and thus the direction of their magnetization is parallel to the core field. This is not, however, the case for Mars. The Martian magnetic source bodies carry remanent magnetization of unknown direction and intensity. The interpretation of the Martian magnetic anomalies is doubly non-unique. The magnetizing core field was likely non-vertical over the majority of the Martian surface. It requires accurate identification and modeling techniques of isolated magnetic anomalies to determine the paleomagnetic pole positions. We use the areobreaking and science phase magnetic data obtained within 100--200 km altitudes and the mapping phase magnetic data acquired at about 400 km altitude to reassess the paleomagnetic pole positions. Rather than extracting data from a spherical harmonic model, we use all three components of the orbital magnetic data and directly model them using vertical prisms of elliptical cross section. Many different techniques in space and spectral domains are used to assess the reliability of the small and isolated magnetic anomalies measured at high altitudes. Many of the new pole positions agree, but not identically, with the previous results. We will discuss the methods we used, and implications of the paleopole positions on the crustal magnetization, tectonics, and the polar wandering of Mars.

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