The performance of various palaeointensity techniques as a function of rock magnetic behaviour – A case study for La Palma

Monster, M.; Groot, Lennart de; Biggin, Andrew J.; Dekkers, Mark J.

doi:10.1016/j.pepi.2015.03.004

Cited by 25 publications

(34 citation statements)

References 40 publications

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“…The IZZI, MSP, and pseudoThellier overlap within uncertainty envelopes. The consistency between the different methods adds considerably to the credibility of the obtained values (see also de Groot et al, 2013;Paterson et al, 2014;Monster et al, 2015a).…”

Section: Comparing Paleointensity Methodsmentioning

confidence: 91%

“…As all four methods take a different approach to obtain an estimate of the absolute palaeofield, consistency between their results is a strong indication that the obtained palaeointensity is reliable (de Groot et al, 2013;Monster et al, 2015a).…”

Section: Palaeointensity Experimentsmentioning

confidence: 94%

“…To further test the multi-method palaeointensity approach (de Groot et al, 2013;Monster et al, 2015a), we revisited twelve sites from Schnepp (1996) that had previously been dated by Schmincke and Mertes (1979), Lippolt (1985,1986) and van den Bogaard et al (1989). The sites are given in Table 1 ordered from young to old.…”

Section: Geological Setting and Samplingmentioning

confidence: 99%

“…Paterson et al, 2014). Most recently, a multi-method approach has been proposed to increase the success rate of (tedious) palaeointensity experiments (de Groot et al, 2013;Monster et al, 2015a). This approach at the same time provides an additional consistency check: if methods that are based on different principles yield a similar result, the obtained palaeointensity is much more likely to be correct.…”

Section: Introductionmentioning

confidence: 99%

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Full-vector geomagnetic field records from the East Eifel, Germany

Monster

Langemeijer

Wiarda

et al. 2018

Physics of the Earth and Planetary Interiors

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A B S T R A C TTo create meaningful models of the geomagnetic field, high-quality directional and intensity input data are needed. However, while it is fairly straightforward to obtain directional data, intensity data are much scarcer, especially for periods before the Holocene. Here, we present data from twelve flows (age range ∼ 200 to ∼ 470 ka) in the East Eifel volcanic field (Germany). These sites had been previously studied and are resampled to further test the recently proposed multi-method palaeointensity approach. Samples are first subjected to classic palaeomagnetic and rock magnetic analyses to optimise the subsequent palaeointensity experiments. Four different palaeointensity methods -IZZI-Thellier, the multispecimen method, calibrated pseudo-Thellier, and microwave-Thellier -are being used in the present study. The latter should be considered as supportive because only one or two specimens per site could be processed. Palaeointensities obtained for ten sites pass our selection criteria: two sites are successful with a single approach, four sites with two approaches, three more sites work with three approaches, and one site with all four approaches. Site-averaged intensity values typically range between 30 and 35 μT. No typically low palaeointensity values are found, in line with paleodirectional results which are compatible with regular palaeosecular variation of the Earth's magnetic field. Results from different methods are remarkably consistent and generally agree well with the values previously reported. They appear to be below the average for the Brunhes chron; there are no indications for relatively higher palaeointensities for units younger than 300 ka. However, our young sites could be close in age, and therefore may not represent the average intensity of the paleofield. Three of our sites are even considered coeval; encouragingly, these do yield the same palaeointensity within uncertainty bounds.

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Section: Comparing Paleointensity Methodsmentioning

confidence: 91%

Section: Palaeointensity Experimentsmentioning

confidence: 94%

Section: Geological Setting and Samplingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Full-vector geomagnetic field records from the East Eifel, Germany

Monster

Langemeijer

Wiarda

et al. 2018

Physics of the Earth and Planetary Interiors

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“…Comparison of the results obtained with a Thellier‐type and the MS method accompanied by detailed rock‐magnetic experiments may provide useful information, especially if experiments are performed on rocks in which magnetization was acquired in a known field. In fact, consistency of paleointensity determinations obtained from methods relying on different principles may support the reliability of such results [ Böhnel et al ., ; De Groot et al ., ; Monster et al ., ]. Furthermore, interesting information might be obtained when analyzing rock‐magnetic characteristics of sites in which results obtained with both methods agree or disagree.…”

Section: Introductionmentioning

confidence: 99%

A comparison of Thellier-type and multispecimen paleointensity determinations on Pleistocene and historical lava flows from Lanzarote (Canary Islands, Spain)

Calvo‐Rathert

Morales‐Contreras²,

Carrancho

et al. 2016

Geochem. Geophys. Geosyst.

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Sixteen Miocene, Pleistocene, and historic lava flows have been sampled in Lanzarote (Canary Islands) for paleointensity analysis with both the Coe and multispecimen methods. Besides obtaining new data, the main goal of the study was the comparison of paleointensity results determined with two different techniques. Characteristic Remanent Magnetization (ChRM) directions were obtained in 15 flows, and 12 were chosen for paleointensity determination. In Thellier-type experiments, a selection of reliable paleointensity determinations (43 of 78 studied samples) was performed using sets of criteria of different stringency, trying to relate the quality of results to the strictness of the chosen criteria. Uncorrected and fraction and domain-state corrected multispecimen paleointensity results were obtained in all flows. Results with the Coe method on historical flows either agree with the expected values or show moderately lower ones, but multispecimen determinations display a large deviation from the expected result in one case. No relation can be detected between correct or anomalous results and paleointensity determination quality or rock-magnetic properties. However, results on historical flows suggest that agreement between both methods could be a good indicator of correct determinations. Comparison of results obtained with both methods on seven Pleistocene flows yields an excellent agreement in four and disagreements in three cases. Pleistocene determinations were only accepted if either results from both methods agreed or a result was based on a sufficiently large number (n > 4) of individual Thellier-type determinations. In most Pleistocene flows, a VADM around 5 3 10

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