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Characterization of soft-sediment deformation: Detection of cryptoslumps using magnetic methods

¹ Scripps Institution of Oceanography, University of California—San Diego, La Jolla, California 92093-0208, USA

Many workers have explored anisotropy of magnetic susceptibility (AMS) of sediments as an indicator of deformation. Several studies have used deflection of the eigenvector associated with the minimum in susceptibility, V₃, as a criterion for deformation. We examine the AMS record of a well-exposed slump and find that although demonstrable deformation can occur without deflecting the V₃ directions, an oblate AMS fabric is transformed into a triaxial fabric during initial deformation. Transformation of the fabric from oblate to triaxial appears to be highly correlated with an increase in natural remanent magnetization scatter, whereas deflection of the V₃ axes is not. We suggest that subtle soft-sediment deformation can be detected by using AMS fabric.

Key Words: Ardath Shale • soft-sediment deformation • anisotropy of magnetic susceptibility • paleomagnetism

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