High paleointensities for the Canary Islands constrain the Levant geomagnetic high



de Groot, Lennart V, Béguin, Annemarieke, Kosters, Martha E, van Rijsingen, Elenora M, Struijk, Erzsébet LM, Biggin, Andy ORCID: 0000-0003-4164-5924, Hurst, Elliot, Langereis, Cor G and Dekkers, Mark J
(2015) High paleointensities for the Canary Islands constrain the Levant geomagnetic high. Earth and Planetary Science Letters, 419. 154 - 167.

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Abstract

Understanding the behavior of enigmatic geomagnetic traits such as the Levant intensity high is currently challenged by a lack of full vector records of regional variations in the geomagnetic field. Here we apply the recently proposed multi-method paleointensity approach to a suite of 19 lavas from the Canary Islands dating between ∼4000 BC and 1909 AD. Our new record reveals high paleointensities (VADMs >120 ZAm2) coinciding with and shortly after the peak in geomagnetic intensity in the Levant at ∼1000 BC. Furthermore our data suggests a westward movement of this geomagnetic phenomenon at a rate of 6.7–12° per century. In addition to IZZI-Thellier, microwave-Thellier and the multi-specimen method, the calibrated pseudo-Thellier method is an important part of the multi-method paleointensity approach. The calibration of this relative paleointensity method was derived from a suite of Hawaiian lavas; it is improved with the results of the Canarian cooling units. Pseudo-Thellier results from samples with very low Curie temperature (<150 °C), however, cannot be reliably converted to absolute paleointensity estimates. The multi-method paleointensity approach yielded a reliable estimate for ∼60% of the flows sampled – an unusually high success rate for a paleointensity study involving lavas.

Item Type: Article
Subjects: ?? QE ??
Depositing User: Symplectic Admin
Date Deposited: 10 Oct 2016 09:27
Last Modified: 23 Jul 2022 15:10
DOI: 10.1016/j.epsl.2015.03.020
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3003698

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