Indication of a geomagnetic low-inclination excursion in supposed Middle Weichselian interstadial marine clay at Rubjerg, Denmark

Details Indication of a geomagnetic low-inclination excursion in supposed Middle Weichselian interstadial marine clay at Rubjerg, Denmark Indication of a geomagnetic low-inclination excursion in supposed Middle Weichselian interstadial marine clay at Rubjerg, Denmark

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pepi...18..238a&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 18, Issue 3, p. 238-246.

Physics

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Scientific paper

Palaeomagnetic measurements have been made on specimens from Late Pleistocene sediments of a piston boring at Rubjerg in Vendsyssel, northern Jutland. The stratigraphy of the deposits is based on content of foraminifera. A total of 70 relatively oriented specimens were investigated palaeomagnetically. Normal steep inclinations close to that of the axial dipole field were found in the Upper Saxicava Sand and in the Younger Yoldia Clay (radiocarbon dated at 14,650 +/- 190-12,650 +/- 180 B.P.), and a secular variation with an amplitude of 10-12° in the inclincation and a ``period'' roughly estimated at about 350-400 years was found in the Younger Yoldia Clay. Seventeen relatively oriented specimens from undisturbed older marine deposits revealed a stable low inclination of 11° with α95 = 3°. The age of this apparent geomagnetic excursion falls somewhere between 23,000 and 40,000 B.P. (Older Yoldia Clay). Among other known geomagnetic excursions and events within this interval are Laschamp in France, Mono Lake in California and Lake Mungo in Australia. Until more definite ages have been obtained, the excursion is provisionally named the ``Rubjerg Excursion''.

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