L.V. de Groot
of Earth Sciences,
+31 30 253 1361
+31 30 243 1677
of Lennart de Groot
error and anisotropy or ARM in red beds from the Lodève Basin (Southern
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.
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..
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
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 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.