Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmgp21c0041g&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #GP21C-0041
Physics
1518 Magnetic Fabrics And Anisotropy, 1519 Magnetic Mineralogy And Petrology, 1540 Rock And Mineral Magnetism, 6240 Meteorites And Tektites
Scientific paper
We conducted a rock magnetic, magnetic anisotropy and paleomagnetic study of the brecciated LL6 bensour meteorite a few months after its fall on Earth. Magnetic properties, in particular hysteresis loops before and after heating, as well as high field anisotropy indicate that tetrataenite is the major magnetic mineral. A very strong coherent susceptibility and remanence anisotropy is evidenced and interpreted as due to the last large impact responsible for the post-metamorphic and post-brecciation compaction of this material. Demagnetization of mutually oriented sub-samples evidences three components of magnetization. Medium and high coercivity components carried by tetrataenite are randomly distributed down to a scale of 0.1 cc. They represent the magnetization acquired by tetrataenite during its formation by low-temperature atomic ordering of taenite, but the link with the original magnetization of taenite and kamacite grains, acquired during cooling of the parent body after metamorphism, is unknown. Alternatively this randomness may be due to a post-metamorphic thermoremanent magnetization subsequently randomized by brecciation. A non random low-coercivity component is also evidenced. We show that it clearly predates the fall of the meteorite on Earth and postdates the last major impact on the meteorite parent body. The coercivity spectrum of this component as well as the close relation with the impact-related petrofabric indicate that the low coercivity component is likely related to this major impact, possibly in quasi-absence of ambient magnetic field.
Denise M.
Gattacceca Jérôme
Rochette Pierre
No associations
LandOfFree
Shock and Anisotropy Related Magnetization in a Freshly Fallen LL Ordinary Chondrite does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Shock and Anisotropy Related Magnetization in a Freshly Fallen LL Ordinary Chondrite, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Shock and Anisotropy Related Magnetization in a Freshly Fallen LL Ordinary Chondrite will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1427094