Journal
EARTH AND PLANETARY SCIENCE LETTERS
Volume 419, Issue -, Pages 154-167Publisher
ELSEVIER
DOI: 10.1016/j.epsl.2015.03.020
Keywords
paleointensity; Canary Islands; multi-method paleointensity approach; Thellier; intensity highs
Categories
Funding
- Earth and Life Science Division (ALW) of the Netherlands Organization for Scientific Research (NWO)
- Netherlands Research Center for Integrated Solid Earth Sciences (ISES)
- NERC Advanced Fellowship [NE/F015208/1]
- NERC [NE/F015208/1] Funding Source: UKRI
- Natural Environment Research Council [NE/F015208/1] Funding Source: researchfish
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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 similar to 4000 BC and 1909 AD. Our new record reveals high paleointensities (VADMs >120 ZAm(2)) coinciding with and shortly after the peak in geomagnetic intensity in the Levant at similar to 1000 BC. Furthermore our data suggests a westward movement of this geomagnetic phenomenon at a rate of 6.7-12 degrees 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 degrees C), however, cannot be reliably converted to absolute paleointensity estimates. The multi-method paleointensity approach yielded a reliable estimate for similar to 60% of the flows sampled - an unusually high success rate for a paleointensity study involving lavas. (C) 2015 Elsevier B.V. All rights reserved.
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