An experiment on the post-depositional remanent magnetization in artificial and natural sediments

Details An experiment on the post-depositional remanent magnetization in artificial and natural sediments An experiment on the post-depositional remanent magnetization in artificial and natural sediments

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..51..221h&link_type=abstract

Earth and Planetary Science Letters, Volume 51, Issue 1, p. 221-232.

Mathematics

Logic

10

Scientific paper

Artificial and natural sediments were consolidated at constant loading rate in a known magnetic field, and the resultant remanent magnetization was observed. The experiment revealed that both the artificial and natural sediments can acquire remanent magnetization during the consolidation process. The acquisition process was determined as a function of the void ratio, which is the volume ratio of water to solid powder in the sample. The artificial sediment acquired remanence with the void ratio varying from 1.4 to 0.9. On the other hand, the range of the void ratio in the natural sediments is from 6 to 3. These void ratios roughly correspond to a depth of 15 cm and 2.5 m, respectively.
The gradual acquisition of remanence during the consolidation shows that the remanence indicates some average of the ambient field over a period of time which depends on the sedimentation rate. A simple model based on relaxation qualitatively explains the above result. Results of alternating field demagnetization indicate that the stability of the remanence is not determined by bodily rotations of magnetic grains, but is controlled by coercivity of the magnetic grains. The recorded field direction in the deep-sea sediments did not show a systematic deviation from the applied field direction.
Present address: Department of Geological Sciences, University of California, Santa Barbara, CA 93106, U.S.A.

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