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Palaeomagnetic intensity from 14C-dated flows on the Big Island, Hawaii: 0-21kyr

Pressling, Nicola, Laj, Carlo, Kissel, Catherine, Champion, Duane and Gubbins, David (2006) Palaeomagnetic intensity from 14C-dated flows on the Big Island, Hawaii: 0-21kyr Earth and Planetary Science Letters, 247, (1-2), pp. 26-40. (doi:10.1016/j.epsl.2006.04.026).

Record type: Article


Thellier–Thellier experiments were carried out on 216 lava samples collected by the USGS on the Big Island. 35 individual flows from the Kilauea, Mauna Loa and Hualalai volcanoes are represented and independent radiocarbon dating of the flows yields absolute ages ranging from 290 to 20,240 yrs old. The palaeomagnetic analysis was carried out at the Laboratoire des Sciences du Climat et de l'Environnement in Gif-sur-Yvette, France, in two custom built, large capacity furnaces that have been specifically designed to minimise oxidation. The temperature steps were adapted to accommodate the characteristic loss of magnetisation at low temperatures seen in the Curie balance results and the use of half-size samples allowed secondary experiments to be carried out where necessary. The strict PICRIT-03 selection criteria were rigorously applied to the data and a high success rate of 53% has been achieved on a sample level. The flow averaged results almost double the existing 14C-dated palaeointensity dataset for this time window and confirm a period of high intensity over the past 4 kyr preceded by a period in which the dipole moment was weaker. However, the values attained in this study are on average higher than previously published data; reliability of these values is discussed.

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Published date: 15 July 2006
Keywords: palaeointensity, selection criteria, Hawaii, Thellier–Thellier method, radiocarbon ages


Local EPrints ID: 68859
ISSN: 0012-821X
PURE UUID: 9b119dc4-4db3-40ed-b5be-31fd09ea3e64

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Date deposited: 06 Oct 2009
Last modified: 19 Jul 2017 00:15

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Author: Nicola Pressling
Author: Carlo Laj
Author: Catherine Kissel
Author: Duane Champion
Author: David Gubbins

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