Palaeomagnetism and magnetomineralogy of a Holocene lake sediment from Vågsøy, western Norway

Details Palaeomagnetism and magnetomineralogy of a Holocene lake sediment from Vågsøy, western Norway Palaeomagnetism and magnetomineralogy of a Holocene lake sediment from Vågsøy, western Norway

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pepi...27..143l&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 27, Issue 2, p. 143-150.

Physics

2

Scientific paper

Stable remanent directions encountered in three oriented lake-sediment cores, covering 6 m of gyttja deposits, reveal declination swings with amplitudes of the order of +/- 50°. Anomalously low inclinations, scattered around the horizontal in the upper 2 m of core, is attributed to compressional disturbances of the alignment of magnetic grains during the coring procedure. Four 14C dates obtained (1250, 1940, 4600 and 6330 y B.P.) have enabled a correlation with features `c'-`g' of the British Geomagnetic Master Curve). For the older part of the curve, features `h' and `i', the correlation is questionable. Magneto-mineralogical parameters and qualitative chemical analysis of individual grains by secondary X-ray emission analysis reveal the presence of pure magnetite grains. Scanning electron micrographs show a dominant proportion of concoidal slightly elongated grains (10-80 μm). A few almost-perfect octahedral magnetite crystals can be related to outcrops of augen gneisses in the vicinity confirming a detrital origin of these grains.
Present address: Department of Geology, Quaternary Institute, University of Bergen, N-5000 Bergen, Norway.

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