RT info:eu-repo/semantics/article
T1 A comparison of Thellier-type and multispecimen paleointensity determinations on Pleistocene and historical lava flows from Lanzarote (Canary Islands, Spain)
A1 Calvo Rathert, Manuel
A1 Morales Contreras, Juan J.
A1 Carrancho Alonso, Ángel
A1 Goguitchaichvili, Avto
K1 Magnetism
K1 Paleontology
K1 Magnetismo
K1 Paleontología
AB Sixteen Miocene, Pleistocene, and historic lava flows have been sampled in Lanzarote (CanaryIslands) for paleointensity analysis with both the Coe and multispecimen methods. Besides obtaining newdata, the main goal of the study was the comparison of paleointensity results determined with two differenttechniques. Characteristic Remanent Magnetization (ChRM) directions were obtained in 15 flows, and12 were chosen for paleointensity determination. In Thellier-type experiments, a selection of reliablepaleointensity determinations (43 of 78 studied samples) was performed using sets of criteria of differentstringency, trying to relate the quality of results to the strictness of the chosen criteria. Uncorrected andfraction and domain-state corrected multispecimen paleointensity results were obtained in all flows. Resultswith the Coe method on historical flows either agree with the expected values or show moderately lowerones, but multispecimen determinations display a large deviation from the expected result in one case. Norelation can be detected between correct or anomalous results and paleointensity determination quality orrock-magnetic properties. However, results on historical flows suggest that agreement between bothmethods could be a good indicator of correct determinations. Comparison of results obtained with bothmethods on seven Pleistocene flows yields an excellent agreement in four and disagreements in threecases. Pleistocene determinations were only accepted if either results from both methods agreed or a resultwas based on a sufficiently large number (n>4) of individual Thellier-type determinations. In mostPleistocene flows, a VADM around 5 31022 Am2 was observed, although two flows displayed higher valuesaround 931022 Am2.
PB American Geophysical Union (AGU)
SN 1525-2027
YR 2016
FD 2016-09
LK http://hdl.handle.net/10259/4586
UL http://hdl.handle.net/10259/4586
LA eng
NO projectCGL2012-32149 (Ministerio deEconom ıa y Competitividad, Spain),project 320/2011 (Ministerio de MedioAmbiente y Medio Rural y Marino,Spain) and the European RegionalDevelopment Fund (ERDF).
DS Repositorio Institucional de la Universidad de Burgos
RD 23-nov-2024