2026-04-27T14:10:53Zhttps://riubu.ubu.es/oai/requestoai:riubu.ubu.es:10259/45862022-04-29T12:02:48Zcom_10259.4_2560com_10259_5086com_10259_2604col_10259.4_2561
Repositorio Institucional de la Universidad de Burgos
author
Calvo Rathert, Manuel
author
Morales Contreras, Juan J.
author
Carrancho Alonso, Ángel
author
Goguitchaichvili, Avto
2017-09-06T11:19:41Z
2017-09-06T11:19:41Z
2016-09
1525-2027
http://hdl.handle.net/10259/4586
10.1002/2016GC006396
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 31022 Am2 was observed, although two flows displayed higher values
around 931022 Am2.
eng
A comparison of Thellier-type and multispecimen paleointensity determinations on Pleistocene and historical lava flows from Lanzarote (Canary Islands, Spain)
info:eu-repo/semantics/article
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URL
https://riubu.ubu.es/bitstream/10259/4586/1/Calvo-GGG_2016.pdf
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https://riubu.ubu.es/bitstream/10259/4586/3/Calvo-GGG_2016.pdf.txt
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Calvo-GGG_2016.pdf.txt