Computer Science
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....7743k&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #7743
Computer Science
Scientific paper
In early solar system history there are several electromagnetic processes expected that may be capable of magnetizing the primitive solid particles condensating from the Solar Nebula. The record of these magnetic events can be observed during laboratory studies of meteorites found on the Earth. Different terrestrial processes can affect the magneto mineralogy, can cause changes in magnetic parameters, and can overprint the primary magnetic record. The effect of surface heating (when falling through the atmosphere) was the subject of the study with the Murchison meteorite. Using the Allende meteorite we studied the effect of the shock pressure generated by the friction of the atmosphere during the meteorite fall. Some of the meteorites are found several days after the fall, some of them are deposited in the desert or on the Antarctic ice for thousands of years. Most of them contain visible traces of terrestrial oxidation and weathering. We used the sample of the LL chondrite found in the Libya desert (perhaps thousands years ago), sample of the iron meteorite Campo del Cielo (found in Argentina 5000 years after the fall), and sample of the H 5 Zebrak meteorite (found only several days after the fall) for weathering simulations. To document the results of our experiments we used low and high temperature measurements of magnetic susceptibility, measurements of magnetic remanence and its stability and hysteresis parameters. The results tell us, that the terrestrial processes are efficient factor in changing magnetic properties and can overprint the primary magnetic record. Therefore extreme care has to be taken when selecting samples for primary magnetic component study. Acknowledgements: This work is supported by Charles University Grant Agency, Czech Republic and would not be possible without the help of following people: Jakub Haloda, Petr Jakes, Marcela Bukovanska, Jaroslav Kadlec, Libuse Kohoutova, Vladimir Kohout.
Kletetschka Gunther
Kobr M.
Kohout Tomas
Pruner Petr
Wasilewski Peter J.
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