Abstract

Close correlation of the variations in saturation isothermal remanent magnetization (SIRM) is found between two deep-sea sediment cores with different sedimentation rates, which were sampled 500km apart from each other. The clear correlation of the variations of the natural remanent magnetization (NRM) to SIRM in the relative inter-core time scale obtained from the SIRM correlation, and the rock magnetic diagnosis for the sediments, indicate that the variations probably reflect secular variation of the geomagnetic field intensity in almost the whole length of the Quaternary period. Long period secular variation of declination ranging from 0.02My to the order of 0.1My is revealed from a comparison of the relative declination between the cores in the early Brunhes epoch. The width of magnetizing zone, represented by half fixing depths, is estimated by comparing deconvoluted variations in declination and NRM/SIRM.

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