Physics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....4089r&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #4089
Physics
Scientific paper
Since the discovery of large amplitude magnetic variations on Mars by the MGS spacecraft, a number of studies have used these anomalies to propose tectonics as well as magnetization parameters of crustal blocks on the Martian crust. Magnetic anomaly data on Earth have been extremely important in constructing the paradigm of Plate Tectonics, and clearly the Martian anomalies are important in understanding the ancient Martian evolution. However, because magnetic anomalies observed at satellite altitudes are often coalesced from a number of areally small adjacent anomalies, I examine the question of how well can we infer tectonics from magnetic data collected near the mean altitude of 150 km. An investigation of magnetic anomalies at 150 km altitude of some of the unambiguous and well-established tectonic cases on Earth suggests that inferences regarding the tectonics of the underlying region made from these anomalies can be grossly incorrect. Therefore, if the aim is to understand and verify ancient Martian tectonics, data from very low altitude magnetic missions may be the only recourse.
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