Publication Date:
1985-01-01
Description:
Various sediments have been studied to find the correlation between the geomagnetic field variations and the climatic changes in the past (Wollin et al., 1971a and 1971b; Kawai, 1972; Bucha, 1980). The geomagnetic record in argillaceous sediments tends to have been fixed behind the time of deposition as a post depositional remanent magnetization (PDRM) through such realignment processes as a bioturbation (Irving, 1957; Irving and Major, 1964; Kent, 1973). The recording process tends to be subject to the amplitude attenuation and phase lag of the directional change of magnetization, and to the intensity reduction due to cancellation effect of magnetic moments (Hyodo, 1984). On the other hand, the climatic record, which we can decipher with the oxygen isotopic ratio of organic materials in sediments or merely with the abundance of organic materials in each depth level, tends to be an information before deposition, because it seems to take a long time to deposit after death of the organisms. Time lag between these two records puzzles us to find the true correlation between them. © 1985, Society of Geomagnetism and Earth, Planetary and Space Sciences. All rights reserved.
Print ISSN:
0022-1392
Topics:
Geosciences
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