Long-/τ VRM and relative paleointensity estimates in sediments

Details Long-/τ VRM and relative paleointensity estimates in sediments Long-/τ VRM and relative paleointensity estimates in sediments

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999e%26psl.168..145k&link_type=abstract

Earth and Planetary Science Letters, Volume 168, Issue 1-2, p. 145-158.

Computer Science

Scientific paper

Geomagnetic paleointensity measurements from sedimentary records can be severely affected by viscous remanent magnetization (VRM). We present a method for determining varying amounts of long-term VRM acquired during the present polarity interval, using the typically non-linear relationship between acquisition of artificial magnetization and demagnetization of NRM. The non-linear parts are to be avoided for paleointensity determinations, but here we focus on their use for indicators of long-relaxation time VRM. The method, which does not require determining paleointensity values, suggests correlations with paleoclimate curves and age-dependent growth of VRM. Furthermore, it appears that the long-/τ VRM acquired during the Pleistocene is accompanied by short-/τ effects detected in the laboratory environment.

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