Other
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993metic..28..595m&link_type=abstract
Meteoritics, volume 28, number 4, page 595.
Other
2
Interplanetary Dust
Scientific paper
Following the distribution at The 53rd Annual Meeting of the Meteoritical Society of 40 kg of Cretaceous-Tertiary boundary layer clay (Fish Clay) recovered from Stevns Klint, Denmark, a magnetic analysis of both the coarse and fine fractions was carried out. The magnetic mineralogy was found to be complex, consisting of single-domain magnetite and fine-grained sulphides of Fe. The Fe sulphide was present as ferrimagnetic pyrrhotite (Fe7S8) and other sulphides that decayed on heating to produce magnetite. A magnetic fraction of the material was separated by using a strong hand magnet. The separate from the coarse fraction was found to contain low-Ni,Fe (TC = 750-770 °C) in trace quantities. Since contamination seems unlikely, it must be concluded that the Fe has an extraterrestrial origin. Whilst partially-degraded cosmic spherules may add to the signal, their input is believed to be insignificant. The other obvious source is debris from the vapourization of a K/F impactor.
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