Sedimentary records of reversal transitions - Magnetization smoothing artefact or geomagnetic field behaviour?

Details Sedimentary records of reversal transitions - Magnetization smoothing artefact or geomagnetic field behaviour? Sedimentary records of reversal transitions - Magnetization smoothing artefact or geomagnetic field behaviour?

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.2007w&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 20, p. 2007-2010.

Physics

13

Geomagnetism, Paleomagnetism, Sedimentary Rocks, Data Smoothing, Magnetic Poles

Scientific paper

A critical overview of smoothing in the recording of geomagnetic field behavior during reversals in sedimentary records is presented. It is shown that smoothing over unrealistically long time scales is required to generate intermediate directions of magnetization which are purely mixtures of pretransitional and posttransitional directions in sediments whose remanence is primarily depositional remanence. It is concluded that, provided that magnetization directions are properly cleaned to give single component directions, the preferential longitudes of reversal VGP paths will be due to field behavior and not to an artefact of the magnetization process. If mixtures of primary magnetization acquired at the time of the formation of the rock and secondary magnetization acquired later are measured, then artefacts will be generated.

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