Distribution of crustal magnetic fields on Mars: Shock effects of basin-forming impacts
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Hood_et_al-2003-Geophysical_Re ...
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Univ Arizona, Lunar and Planetary LabIssue Date
2003-03
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AMER GEOPHYSICAL UNIONCitation
Distribution of crustal magnetic fields on Mars: Shock effects of basin-forming impacts 2003, 30 (6) Geophysical Research LettersJournal
Geophysical Research LettersRights
Copyright 2003 by the American Geophysical Union.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Crustal magnetic fields on Mars are inhomogeneously distributed with the strongest fields occurring over the southern highlands in a longitude sector between approximately 130°E and 240°E. Using analytic approximations and empirical scaling laws, it is estimated that much of the weakly magnetized southern highlands (i.e., that between 110°W and 130°E) was shocked to pressures exceeding 1–2 GPa during the Hellas and Argyre impacts. Possible primary remanence carriers in the martian crust include iron oxides and iron sulfides (pyrrhotite). If pyrrhotite is the main remanence carrier, extensive demagnetization of crustal regions (∼90%) may occur at shock pressures of 2 GPa or more. Thus, at least for this remanence carrier, impact shock demagnetization can potentially explain the distribution of crustal fields in the southern highlands.Note
6 month embargo; First published: 20 March 2003ISSN
00948276Version
Final published versionSponsors
Supported by a grant from the NASA Mars Data Analysis Program.Additional Links
http://doi.wiley.com/10.1029/2002GL016657ae974a485f413a2113503eed53cd6c53
10.1029/2002GL016657