People at Fort Hoofddijk

Lennart de Groot
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Mr. L.V. de Groot
Paleomagnetic Laboratory
Fort Hoofddijk
Department of Earth Sciences, 
Utrecht University 
Budapestlaan 17
3584 CD Utrecht 
The Netherlands 

Phone +31 30 253 1361
Fax +31 30 243 1677


Research of Lennart de Groot

Inclination error and anisotropy or ARM in red beds from the Lodève Basin (Southern France)

Two different methods of correcting the inclination error in magnetic vectors due to compaction in red beds are described in literature. 

One method relies on the statistical secular variation field model TK03.GAD by Tauxe and Kent (2004). The TK03 method uses the so called elongation - inclination correction on a distribution of directions that is sufficiently large (N > 100). This requires sufficient sampling of a section through geologic time.

Lennart drilling in red beds
Another method relies on the experiments and model of Tan and Kodama (2002). The TK02 method provides a model that uses the differences in behaviour of the anisotropy of magnetic susceptibility (AMS) tensor and the anisotropy of the anhysteric remanent magnetization (AAR) tensor upon sedimentary compaction. It yields a so called a-factor which is then  used for calculating decompaction. This a-factor can independently be determined via experiments, through a series of labour-intensive measurements.

Drilling is a nice sport ........................................... but can be tiring
This MSc research project aims at making a comparison and reliability analysis of these different methods/models. A suitable data-set for all the needed measurements for both TK03 and the analytical and experimental TK02 was gathered in the Lodève region in Southern France, from Permian Superchron red beds..

Preliminiry results of this research project were presented at the AGU Fall meeting in San Francisco (December 2007). Currently, a paper is in preparation.

Lennart is in this project supervised by Cor Langereis and Marcela Haldan with valuable support from Tom Mullender. We collaborate with Ken Kodama (LeHigh University, USA), who also does the the experimental determination of the a-factor.

publications Publications of Lennart de Groot
  • De Groot, L.V. Haldan, M.M. and Langereis, C.G. (2007). Inclination Error Correction In Red Beds: Is It Possible ? AGU Fall Meeting, San Francisco (USA), abstracts.