Distribution of crustal magnetic fields on Mars: Shock effects of basin-forming impacts
AffiliationUniv Arizona, Lunar and Planetary Lab
MetadataShow full item record
PublisherAMER GEOPHYSICAL UNION
CitationDistribution of crustal magnetic fields on Mars: Shock effects of basin-forming impacts 2003, 30 (6) Geophysical Research Letters
JournalGeophysical Research Letters
RightsCopyright 2003 by the American Geophysical Union.
Collection InformationThis 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 firstname.lastname@example.org.
AbstractCrustal 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.
Note6 month embargo; First published: 20 March 2003
VersionFinal published version
SponsorsSupported by a grant from the NASA Mars Data Analysis Program.