Computer Science
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997m%26ps...32..803c&link_type=abstract
Meteoritics & Planetary Science, vol. 32, no. 6, pages 803-811
Computer Science
34
Scientific paper
The magnetic properties of samples of seven Martian meteorites (EET79001, Zagami, Nakhla, Lafayette, Governador Yaladares, Chassigny and ALH 84001) have been investigated. All possess a weak, very stable primary natural remanent rnagnetization (NRM), and some have less stable secondary components. In some cases the latter are associated with magnetic contamination of the samples, imparted since their recovery, and with viscous magnetization, acquired during exposure of the meteorites to the geomagnetic field since they fell. The magnetic properties are carried by a small content (<1%) of titanomagnetite and, in ALH 84001, possibly by magnetite as well. The most likely source of the primary NRM is a thermoremanent magnetization, acquired when the meteorite material last cooled from a high temperature in the presence of a magnetic field. Current evidence is that this was 1.3 Ga ago for the nakhlites and Chassigny and 180 Ma for shergottites: the time of the last relevant cooling of ALH 84001 is not presently known. Preliminary estimates of the strength of the magnetizing field are in the range 0.5-5 deg T, at least an order of magnitude greater than the present field. It is tentatively concluded that the magnetic field was generated by a dynamo process in a Martian core with appropriate structure and properties.
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