Abstract
Tectonic deformation can take place in unlithified sediments shortly after deposition. Similarly, laboratory induced stresses can produce a magnetic fabric in wet and unlithified sediments. This is the case of the Holocene sediments from proglacial Lake Barrancs (Central Southern Pyrenees) which we studied for both geomagnetic and paleoclimatic purposes. The sediments are constituted by glaciolacustrine rhythmites with a high phyllosilicate content. The Anisotropy of Magnetic Susceptibility (AMS) of the sediments was measured with a KLY-2 apparatus. Directional data of different cores from the same borehole provide a striking distribution of the principal maximum axes of the susceptibility ellipsoid, suggesting that a laboratory induced AMS was introduced during the acquisition of samples.
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