Computer Science
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.351..223v&link_type=abstract
Nature, Volume 351, Issue 6323, pp. 223-225 (1991).
Computer Science
16
Scientific paper
RECORDS of geomagnetic reversals 'frozen' into the magnetic components of sediments provide a means to study the time-dependent behaviour of the geomagnetic field during polarity transitions. Although sedimentary records have the advantage of being readily available and continuous, the process by which they acquire a remanent magnetization is still not fully understood1. Magnetites, which lose their magnetization at relatively high temperatures (<~580 °C), are generally considered to carry the primary remanence of the sediment—that is, to record the palaeomagnetic direction. Here we describe two reversed-to-normal transitional records from marine marls in which this high-temperature component shows a delayed remanence acquisition relative to a lower-temperature component. In these samples, therefore, the high-temperature component does not reflect geo-magnetic changes during the reversal. At least for marine marls, detailed palaeomagnetic, rock-magnetic and geochemical studies are apparently necessary to judge the validity of reversal records.
Langereis Cor G.
van Hoof A. M. A.
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