Magnetostratigraphy in three Arctic Ocean sediment cores; arguments for geomagnetic excursions within oxygen-isotope stage 2-3

Details Magnetostratigraphy in three Arctic Ocean sediment cores; arguments for geomagnetic excursions within oxygen-isotope stage 2-3 Magnetostratigraphy in three Arctic Ocean sediment cores; arguments for geomagnetic excursions within oxygen-isotope stage 2-3

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pepi...43..173l&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 43, Issue 2, p. 173-184.

Physics

28

Scientific paper

Two zones with shallow to steep negative palaeomagnetic directions have been detected within similar lithological units in three high latitude gravity cores from the Arctic Ocean. Coinciding azimuthal distributions of declinations relative to arbitrary oriented sub-sampling surfaces are attributed to the systematic acquisition of magnetic components by frictional deformation of the unconsolidated sediment during the sub-sampling procedure. Alternating field demagnetization to 50 mT was only partly successful in obtaining stable single component directions. Magnetic polarity zones are deduced by extrapolation of directional trends of inclinations during progressive af-demagnetization. High delta δ18O values in sinistrally coiled N. pachyderma range between 4.30-4.68‰ PDB (mean values), reflecting sediment accumulation during continental glaciation. Amino acid ratios of N. pachyderma suggest ages less than approximately 60 000 years ago. When seen in conjunction, these observations suggest that the sediments were deposited within oxygen isotope stages 2-3. The reversed palaeomagnetic polarity zones are concluded to represent two short duration excursions of the geomagnetic field which occurred less than 60 000 years ago. Likely known candidates are the Lake Mungo (28 000-30 000 years ago) and Laschamp/Olby (35 000-40 000 years ago) excursions all confined within oxygen isotope stage 3 (24 000-59 000 years ago).

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