Evidence for Terrestrial Magnetic Contamination of the Chondritic Meteorites

Details Evidence for Terrestrial Magnetic Contamination of the Chondritic Meteorites Evidence for Terrestrial Magnetic Contamination of the Chondritic Meteorites

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmgp21c0044k&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #GP21C-0044

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1540 Rock And Mineral Magnetism, 1594 Instruments And Techniques

Scientific paper

Ordinary chondrites represent primitive material of the Solar System. They provide essential information about the conditions in the early solar nebula. Part of this information can be extracted by analyzing the magnetic properties of meteorites. However, the magnetic record and associated rock magnetic properties are sensitive to the meteorite's numerous post-formation processes including various metamorphic events during planet formation period or terrestrial residence following the meteorite's fall. As shown by the Moravka (H 5-6) and Zebrak (H 5) samples, some ordinary chondrites do not carry stable magnetic remanent record. The loss of primary magnetic remanence (if any) can be associated with metamorphic events that may have taken place before the encounter with the Earth. The soft magnetic component may indicate a viscous terrestrial magnetic contamination. Another (EL 6) meteorite is an example o f a fresh fall. The magnetic material of this chondrite seems to be sensitive to low temperature (< 350 K) ambient magnetic field contamination. The meteorite (H 4) (from the El Baharya "strewn field" of the Libya desert) carries visible traces of terrestrial oxidation and weathering. The magnetic mineral assembly contains products of terrestrial oxidation and the magnetic record present was probably strongly influenced by terrestrial remagnetization. Therefore, numerous space and terrestrial processes reduce the chance of observing a primary magnetic record in ordinary chondrites.

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