Non-uniqueness of the modeled magnetization vectors used in determining paleopoles on Mars

Details Non-uniqueness of the modeled magnetization vectors used in determining paleopoles on Mars Non-uniqueness of the modeled magnetization vectors used in determining paleopoles on Mars

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phdt........24b&link_type=abstract

PhD Thesis, Proquest Dissertations And Theses 2005. Section 0209, Part 0373 60 pages; [M.S. dissertation].United States -- Illin

Computer Science

Scientific paper

This study investigates the non-uniqueness of current magnetization models derived from magnetic anomalies on Mars observed by the Mars Global Surveyor spacecraft. The alternative multiple source configurations developed in this study demonstrate that these sources can explain the anomalies designated as M10 and M3 on Mars equally well as the models derived by Arkani-Hamed (2001, 2002), Arkani-Hamed and Boutin (2003, 2004), Hood and Zakharian (2001) and Richmond and Hood (2003) based on large elliptical or circular prismatic sources, and Frawley and Taylor (2004) based on Helbig method. The results of this study suggest that many of the large isolated magnetic anomalies observed on Mars could be produced by the coalescence effect of differently magnetized smaller sources. The resulting scatter in paleopole locations computed from the alternative multiple source configurations covers nearly 40% of the surface of Mars and, thus, the utility of these paleopole locations in deciphering the ancient tectonics is questioned. Furthermore, the paleopoles computed from the large elliptical or circular prismatic sources require the following special assumptions: (1) Only small lateral lithospheric movement, if any, between the sources of identified anomaly since acquisition of their magnetization. (2) Correct estimation of the source geometry---shape and size. Results suggest on Mars the magnetic model based on the AAS field is likely to yield better source characteristics than modeling of Z-component magnetic field. (Abstract shortened by UMI.)

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