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Improvements in long-core measurement techniques: applications in palaeomagnetism and palaeoceanography

Weeks, Robin, Laj, Carlo, Endignoux, Lionel, Fuller, Michael, Roberts, Andrew, Manganne, René, Blanchard, Erick and Goree, William (1992) Improvements in long-core measurement techniques: applications in palaeomagnetism and palaeoceanography Geophysical Journal International, 114, (3), 651- 662. (doi:10.1111/j.1365-246X.1993.tb06994.x).

Record type: Article

Abstract

We report on new developments in the long-core measurement techniques using u channels in connection with new small-access cryogenic magnetometers. With these new instruments, u-channel samples allow us to measure a wide range of magnetic parameters along entire-core length with a spatial resolution and accuracy virtually equivalent to that obtained using discrete cubic samples. An additional advantage is that the sediment disturbance when sampling is significantly less when using u channels.

We present comparisons of results from both continuous and discrete measurements and examine the effectiveness of minimal deconvolution using various techniques. Examples of continuous measurements of low-field susceptibility, NRM, ARM, IRM, Hrc from North Atlantic deep-sea cores show that it is possible to generate logs of combination of parameters related to rock-magnetic characteristics of the sediments useful in palaeoceanography. In particular, the continuous method allows us to rapidly detect core regions with fast changing magnetic parameters useful for correlation between cores and also for understanding changes in palaeo-environmental conditions.

The fast scan also allows us to detect regions of the core where the rock magnetic parameters are suitable (or not suitable) for palaeomagnetic studies related to changes in the geomagnetic field such as the relative changes in palaeointensity.

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Published date: July 1992

Identifiers

Local EPrints ID: 66150
URI: http://eprints.soton.ac.uk/id/eprint/66150
ISSN: 0956-540X
PURE UUID: 7193a472-3955-4d44-9ef8-be71216de10a

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Date deposited: 05 May 2009
Last modified: 19 Jul 2017 00:27

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Contributors

Author: Robin Weeks
Author: Carlo Laj
Author: Lionel Endignoux
Author: Michael Fuller
Author: Andrew Roberts
Author: René Manganne
Author: Erick Blanchard
Author: William Goree

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