Conference Paper

Meteoritic component in the Cretaceous-Paleogene boundary Fish Clay at Højerup (Stevns Klint, Denmark): the Ir abundance.

May 2010

Conference: Proceedings of the 15th Congress of Geologists of Serbia with International Participation, Belgrade, Serbia, 26-29 May, Book of Abstracts, 171-172.

Authors:

University of Niš

Budimir S. Ilic

Faculty of Medicine, University of Niš, 18000 Niš, Serbia

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Article

Magnetic Analysis of K/T Boundary Layer Clay from Stevns Klint, Denmark

August 1993 · Meteoritics

S. J. Morden

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 ... [Show full abstract] 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.