On the magnetic susceptibility anisotropy of deep-sea sediment

Details On the magnetic susceptibility anisotropy of deep-sea sediment On the magnetic susceptibility anisotropy of deep-sea sediment

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975e%26psl..28....1k&link_type=abstract

Earth and Planetary Science Letters, Volume 28, Issue 1, p. 1-12.

Physics

6

Scientific paper

Susceptibility anisotropies in the form of vertically prolate ellipsoids have been reported in many deep-sea sediment cores. The results of the present investigation suggest that these anisotropies may not describe the original magnetic fabric of deep-sea sediment, but are more likely due to either a measurement effect or to deformation of the sediment during coring. Anisotropy measurements made on a spinner magnetometer sometimes were found to be greatly affected by the shape of the sample. This apparent ``sample-shape effect'' was not observed on a low-field torque meter. The anisotropy of samples taken near the base or the top of some piston cores often reflects sediment disturbance during the scoring operation. Most samples of deep-sea sediment examined had weak anisotropies that could be interpreted as due to normal depositional processes, including bioturbation. The best-fitting susceptibility ellipsoids were usually oblate with near vertical minimum susceptibility axes.

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