People at Fort Hoofddijk

Marilyn Monster
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M.W.L. Monster
Paleomagnetic Laboratory
Fort Hoofddijk
Department of Earth Sciences 
Utrecht University 
Budapestlaan 17, 3584 CD Utrecht 
The Netherlands 

Phone +31 30 253 5246


Research of Marilyn Monster

Evaluation of the domain-size corrected multi-specimen parallel differential pTRM method: 
A test on historical lavas at La Palma
Reliable absolute palaeointensities are needed to determine the full vector variation of Earth’s magnetic field as a function of geological time. However, the classic Thellier-Thellier method, on which most current methods are based, has a very low success rate, is extremely time-consuming and can only be applied to very few specimens. 

A new method of determining absolute palaeointensities was proposed by Dekkers and Böhnel in 2006. This multispecimen parallel differential pTRM method is based on the linearity of pTRM with inducing field, a property that is independent of domain state. It is much faster than Thellier-Thellier-type experiments, and as long as no alteration occurs, it can be used for all magnetic grains.

However, especially for intermediate grain sizes, this method seems to overestimate palaeo- intensities. To solve this problem, Fabian and Leonhardt (in press) proposed a new protocol that uses three additional steps, in which the overprinted pTRMs are isolated, an estimate of the domain state is made, and chemical alteration is detected. This method has thus far only been tested on synthetic specimens. 

In this project, which is supervised by Lennart de Groot, the Fabian-Leonhardt protocol will be evaluated by testing it on historical lava flows on La Palma, one of the Canary Islands. A first field work took place in the summer of 2010

Drilling in lava flows on La Palma


Sampling a lava flow - and a sampled one - at La Teneguia (La Palma)

publications Publications of Marilyn Monster
  • S. Semraua, M.W.L. Monster, M. van der Knaap, B.I. Florea, T. Schmidt and M. Overhand (2010). Membrane lysis by gramicidin S visualized in red blood cells and giant vesicles, Biochim. Biophys. Acta, 1798, 2033-2039.