Preliminary results of a study of four successive sedimentary geomagnetic reversal records from the Mediterranean (Upper Thvera, Lower and Upper Sidufjall, and Lower Nunivak)

Details Preliminary results of a study of four successive sedimentary geomagnetic reversal records from the Mediterranean (Upper Thvera, Lower and Upper Sidufjall, and Lower Nunivak) Preliminary results of a study of four successive sedimentary geomagnetic reversal records from the Mediterranean (Upper Thvera, Lower and Upper Sidufjall, and Lower Nunivak)

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pepi...52..207l&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 52, Issue 3-4, p. 207-231.

Physics

25

Scientific paper

The results of a study of four successive Early Pliocene geomagnetic reversal records are presented. The polarity transitions have been recorded in the Trubi formation of Calabria (S. Italy) which is composed of alternating carbonate-poor and carbonate-rich marly layers with moderately high (> 5 cm ka-1) accumulation rates. The multicomponent NRM contains a well-defined primary component in which two dominant magnetic phases can be recognized: a magnetite and a low-temperature (LT; i.e., removed at moderate temperatures) phase. Most probably the LT phase is pyrrhotite. The combined presence of pyrrhotite and magnetite in the sediment restricts the validity of a XARM-X test for paleointensity studies. The magnetite magnetizations reveal a smoother record relative to the records of the LT phase magnetizations. Between the two phases, no significant delay in the moment of remanence acquisition is observed. The durations of the major directional changes for the reversals are estimated to be in the range 0.3-3.0 ka. The VGP path of the Upper Thvera record follows a great-circle 90° W of the site meridian, indicating a clearly non-zonal transitional field, whereas the VGP paths of the other reversal records are close to the site meridian, indicating a mainly zonal transitional field. The lower Sidufjall and Lower Nunivak records are nearly identical and have a zonal harmonic content similar to records reported for the Matuyama-Brunhes polarity transition.

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