Variations in particle alignment and size in sediments of the Vema Channel record Antarctic bottom-water velocity changes during the last 400 000 years.

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The anisotropy of magnetic susceptibility (AMS) and mean particle size in the silt fraction has been measured in surface sediments and selected cores from the Vema Channel. Results show that a function which represents magnetic grain, long-axis alignment is highly correlated with variation in mean size of the carbonate-free silt fraction. An increase in alignment with increase in particle size reflects an increase in bottom-water velocity. This correlation has been used to infer fluctuation in Antarctic Bottom water (AABW) velocity during the last 400 000 years. The period of highest inferred bottom-water velocity resulted in a late Pliocene hiatus marked by a buried manganese pavement.-from Authors

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Antarctic geoscience, 3rd symposium on Antarctic geology and geophysics, Madison, August 1977

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