In recent years, significant
advances have been made in paleointensity studies, best illustrated by
the introduction of a new PI method. The Multi-Specimen method (MSP), introduced
by Mark Dekkers and Harald Boehnel heats specimens to the same set-temperature
while applying different fields per specimen. Plotting the fraction of
the NRM that is left after the heating step as a function of the applied
field and fitting a line through the data, gives the field for which the
pTRM is the same as the NRM and thus -in theory- the strength of the paleofield.
drilling in Etna volcanics
the summit of Mount Etna
|Lennarts project focusses
on assessing and gaining experience with the MSP method and comparing it
to other PI methods, such as microwave experiments or the more classical
Thellier-Thellier-style experiments. In the fall of 2008 a data set was
drilled on different recent lava flows on the flanks of Mt. Etna, Sicily.
The results of all applied PI methods are puzzling at least...In the spring
of 2010 a fieldwork will be carried out in the state of Hawaii, at the
Big Island and Maui, to further assess the MSP method. Besides that, more
theoretical and fundamental work will be done to test and hopefully further
establish this new PI method.
Lennarts project is
supervised by Mark Dekkers with valuable
support from Tom Mullender
- De Groot,
L.V., Biggin, A.J., Dekkers, M.J., Langereis, C.G., Herrero-Bervera, E. (2013). Rapid regional perturbations to the recent global geomagnetic decay revealed by a new Hawaiian record, Nature Communications, 4, doi: 10.1038/ncomms3727.
- De Groot,
L.V., Mullender, T.A.T. and Dekkers, M.J. (2013). An evaluation of the
influence of the experimental cooling rate along with other
thermomagnetic effects to explain anomalously low paleointensities
obtained for historic lavas of Mt. Etna (Italy), Geophys. J. Int., 193, 1198-1215, doi: 10.1093/gji/ggt065.
Groot, L.V., Dekkers, M.J., Mullender, T.A.T. (2012). Exploring the
potential of acquisition curves of the anhysteretic remanent
magnetization as a tool to detect subtle magnetic alteration induced by
Phys. Earth Planet. Inter., 194-195, 71-84.