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New palaeointensity data from Holocene Icelandic lavas

Stanton, Tania LU ; Riisager, P.; Knudsen, M. P. and Thordarson, T. (2011) In Physics of the Earth and Planetary Interiors 186(1-2). p.1-10
Abstract
We present rock magnetic and palaeointensity data from Holocene Icelandic lava flows, including historical and pre-historical lavas. Susceptibility versus temperature measurements indicate that the magnetic mineralogy is dominated by primary titanomagnetite that have experienced variable degrees of high-temperature oxidisation. The analyses also demonstrate that virtually all studied samples are thermally stable up to their Curie temperatures. Thellier palaeointensity experiments were carried out on 89 samples from fourteen different lava flows (spanning the age of 167 to 9450 cal. years BP). Microwave Thellier experiments were used for one third of the samples, while conventional thermal Thellier was used for the remainder; the two... (More)
We present rock magnetic and palaeointensity data from Holocene Icelandic lava flows, including historical and pre-historical lavas. Susceptibility versus temperature measurements indicate that the magnetic mineralogy is dominated by primary titanomagnetite that have experienced variable degrees of high-temperature oxidisation. The analyses also demonstrate that virtually all studied samples are thermally stable up to their Curie temperatures. Thellier palaeointensity experiments were carried out on 89 samples from fourteen different lava flows (spanning the age of 167 to 9450 cal. years BP). Microwave Thellier experiments were used for one third of the samples, while conventional thermal Thellier was used for the remainder; the two methods produced similar palaeointensities. Altogether, reliable absolute palaeointensity estimates were obtained from all of the lava flows, with values ranging from 38.2 +/- 5.0 mu T to 117.9 +/- 8.3 mu T. The new results indicate that the Holocene geomagnetic field intensity was more dynamic than suggested by the current field models, possibly including brief intervals of anomalously high field strength. (C) 2011 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Iceland, Holocene, Lavas, Rock magnetism, Palaeointensity
in
Physics of the Earth and Planetary Interiors
volume
186
issue
1-2
pages
1 - 10
publisher
Elsevier
external identifiers
  • wos:000291418100001
  • scopus:79955742848
ISSN
0031-9201
DOI
10.1016/j.pepi.2011.01.006
language
English
LU publication?
yes
id
99a8a7a4-e518-47e0-9617-a47d42d7e9e1 (old id 1984759)
date added to LUP
2011-07-08 15:24:04
date last changed
2017-01-15 04:03:23
@article{99a8a7a4-e518-47e0-9617-a47d42d7e9e1,
  abstract     = {We present rock magnetic and palaeointensity data from Holocene Icelandic lava flows, including historical and pre-historical lavas. Susceptibility versus temperature measurements indicate that the magnetic mineralogy is dominated by primary titanomagnetite that have experienced variable degrees of high-temperature oxidisation. The analyses also demonstrate that virtually all studied samples are thermally stable up to their Curie temperatures. Thellier palaeointensity experiments were carried out on 89 samples from fourteen different lava flows (spanning the age of 167 to 9450 cal. years BP). Microwave Thellier experiments were used for one third of the samples, while conventional thermal Thellier was used for the remainder; the two methods produced similar palaeointensities. Altogether, reliable absolute palaeointensity estimates were obtained from all of the lava flows, with values ranging from 38.2 +/- 5.0 mu T to 117.9 +/- 8.3 mu T. The new results indicate that the Holocene geomagnetic field intensity was more dynamic than suggested by the current field models, possibly including brief intervals of anomalously high field strength. (C) 2011 Elsevier B.V. All rights reserved.},
  author       = {Stanton, Tania and Riisager, P. and Knudsen, M. P. and Thordarson, T.},
  issn         = {0031-9201},
  keyword      = {Iceland,Holocene,Lavas,Rock magnetism,Palaeointensity},
  language     = {eng},
  number       = {1-2},
  pages        = {1--10},
  publisher    = {Elsevier},
  series       = {Physics of the Earth and Planetary Interiors},
  title        = {New palaeointensity data from Holocene Icelandic lavas},
  url          = {http://dx.doi.org/10.1016/j.pepi.2011.01.006},
  volume       = {186},
  year         = {2011},
}