Field-dependent postdepositional grain realignment in the PDRM process: experimental evidence and implications

Details Field-dependent postdepositional grain realignment in the PDRM process: experimental evidence and implications Field-dependent postdepositional grain realignment in the PDRM process: experimental evidence and implications

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pepi...85..101l&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 85, Issue 1-2, p. 101-111.

Physics

2

Scientific paper

The field dependence of postdepositional remanent magnetization (PDRM) has been investigated by two-component PDRM acquisition experiments in deviating magnetic fields of different strengths. The experiments have been performed on samples consisting of crushed, natural magnetite grains in pseudo-single-domain (PSD) states embedded (< 0.1% by weight) in a slowly curing epoxy (Araldite). The increasing viscosity with time of the epoxy is thought to mimic consolidation processes in sediments, which gradually inhibits magnetic grain realignment. Resulting PDRM directions are partly intermediate between final and initial field directions which are unresolvable by alternating field demagnetization to 60 mT. The results suggest that partial PDRM acquired in initial low fields are modified by subsequent exposure to stronger fields. This may be due to alignment of grains not affected by the initial field or by remobilization of grains previously aligned in the weaker initial field. The suggested field-dependent PDRM smoothing may prevent improvement of paleomagnetic records by deconvolution procedures, and may imply that longitudinally confined paleomagnetic records in sediments of transitional polar paths during reversals may partly be artifacts of the PDRM recording process.

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