Physics – Geophysics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmgp31c0109k&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #GP31C-0109
Physics
Geophysics
1519 Magnetic Mineralogy And Petrology, 3662 Meteorite Mineralogy And Petrology (1028, 6240), 5109 Magnetic And Electrical Properties (0925), 6030 Magnetic Fields And Magnetism, 6240 Meteorites And Tektites (1028, 3662)
Scientific paper
Neuschwanstein meteorite (enstatite chondrite EL-6) fall occurred on April 6, 2002 close to Neuschwanstein castle in Bavaria, Germany. Total three meteorite bodies were found on the fall site. Two fragments coming from a 1750g body found on July 14, 2002 were obtained to the Division of Geophysics, University of Helsinki. The low temperature magnetic properties were investigated using KLY-3 and KLY-4 kappabridges equipped with low temperature control unit. During the low-temperature susceptibility measurements an unknown kink feature was observed at ~150 K on all measured samples. The closest known magnetic transition is the curie temperature Tc ~170 K of synthetic FeCr2S4 mentioned in Müller et al., 2006. FeCr2S4 is naturally present in enstatite chondrites and iron meteorites in the form of mineral daubreelite and was reported to be present in the Neuschwanstein meteorite in Zipfel and Dreibus, 2003. The extensive study of magnetic susceptibility of Neuschwanstein meteorite and daubreelite extract form Coahuila iron meteorite (hexahedrite, II A) was conducted in order to investigate the low temperature magnetic susceptibility of those materials and its field and frequency dependence. The results indicate Tc of natural daubreelite extract from Coahuila meteorite to be ~160 K what is slightly lower than the Tc of synthetic FeCr2S4 reported in Müller et al., 2006. The magnetic susceptibility of natural daubreelite from Coahuila meteorite and of ~150 K feature in Neuschwanstein meteorite show no field dependence of magnetic susceptibility. Due to the similarity in the low temperature magnetic susceptibility behaviour of Neuschwanstein meteorite and daubreelite extract from Coahuila meteorite we link the Neuschwanstein ~150 K feature to the Tc of daubreelite present in this meteorite. The 10 K difference of the Tc of daubreelite in Neuschwanstein and Coahuila meteorites can be attributed to the presence of impurities or structural deformations in the daubreelite crystals. Daubreelite with its Tc ~160 K may be significant magnetic mineral in cold space environment. However, warming to the terrestrial temperatures results in magnetic unblocking and lost of the magnetic information. The low temperature susceptibility measurements can be used to identify the presence of daubreelite in meteorites. References: C. Muller, V. Zestrea, V. Tsurkan, S. Horn, R. Tidecks and A. Wixforth (2006): SPIN-LATTICE COUPLING IN THE FERRIMAGNETIC SEMICONDUCTOR FeCr2S4 PROBED BY SURFACE ACOUSTIC WAVES. J. Appl. Phys. 99(2), 023906, 2006. J. Zipfel and G. Dreibus (2003): BULK CHEMISTRY OF NEUSCHWANSTEIN (EL6). 66th Annual Meteoritical Society Meeting (2003) Abstract no. A103.
Kletetschka Gunther
Kohout Tomas
Lehtinen Markku
Pesonen Lauri J.
Wasilewski Peter J.
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