A comparison of two sequential geomagnetic polarity transitions (upper Olduvai and lower Jaramillo) from the Southern Hemisphere

Details A comparison of two sequential geomagnetic polarity transitions (upper Olduvai and lower Jaramillo) from the Southern Hemisphere A comparison of two sequential geomagnetic polarity transitions (upper Olduvai and lower Jaramillo) from the Southern Hemisphere

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...39..301c&link_type=abstract

(American Geophysical Union, Session on Irregularities in the Secular Variation and Geodynamic Implications, Cincinnati, OH, May

Physics

25

Geomagnetism, Magnetic Field Inversions, Magnetic Poles, Sequential Analysis, Southern Hemisphere, Astronomical Models, Ocean Bottom, Sediment Transport, Zonal Harmonics

Scientific paper

Normal-to-reverse (N to R) geomagnetic polarity transitions were obtained from a Southern Hemisphere deep-sea sediment core. The upper Jaramillo reversal was continuously sampled taking sections 0.5 cm thick across a 55 cm section, and the upper Olduvai reversal was sampled in a similar manner across 160 cm. Both sets of samples are characterized by full normal and reverse polarity directions which are in agreement with predictions based on the axial dipole fields for the core site latitude. Each record also exhibited a zone yielding intermediate directions. When considered together with the lower Jaramillo transition previously reported from the core, the records represent a sequential set of Southern Hemisphere transitions. The results of zonal harmonic modeling of the records were consistent with the hypothesis of a standing field in the Olduvai and Jaramillo reversals.

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