Bridging the gap: 40Ar/39Ar dating of volcanic eruptions from the ‘Age of Discovery’

Journal article


Preece, Katie, Mark, Darren F., Barclay, Jenni, Cohen, Benjamin E., Chamberlain, Katy J., Jowitt, Claire, Vye-Brown, Charlotte, Brown, Richard J. and Hamilton, Scott 2018. Bridging the gap: 40Ar/39Ar dating of volcanic eruptions from the ‘Age of Discovery’. Geology. 46 (12), pp. 1035-1038. https://doi.org/10.1130/g45415.1
AuthorsPreece, Katie, Mark, Darren F., Barclay, Jenni, Cohen, Benjamin E., Chamberlain, Katy J., Jowitt, Claire, Vye-Brown, Charlotte, Brown, Richard J. and Hamilton, Scott
Abstract

Many volcanoes worldwide still have poorly resolved eruption histories, with the date of the last eruption often undetermined. One such example is Ascension Island, where the timing of the last eruption, and consequently, the activity status of the volcano, is unclear. Here, we use the 40Ar/39Ar dating technique to resolve ages of the three youngest lava flows on the island, which are hawaiites and mugearite with 1.5 – 1.9 wt% K2O. In dating these lavas, we provide the first evidence of Holocene volcanic activity on Ascension (0.51 ± 0.18 ka; 0.55 ± 0.12 ka; 1.64 ± 0.37 ka), determining that it should be classed as an active volcanic system. In addition, we demonstrate that the 40Ar/39Ar method can reproducibly date mafic lava flows younger than 1 ka, decreasing the gap between recorded history and geological dating. These results offer new prospects for determining patterns of late-Holocene volcanic activity; critical for accurate volcanic hazard assessment.

Keywordsvolcanology; geology
Year2018
JournalGeology
Journal citation46 (12), pp. 1035-1038
PublisherGeological Society of America
ISSN00917613
19432682
Digital Object Identifier (DOI)https://doi.org/10.1130/g45415.1
Web address (URL)http://hdl.handle.net/10545/624148
hdl:10545/624148
Publication dates09 Nov 2018
Publication process dates
Deposited09 Sep 2019, 14:46
Accepted08 Oct 2018
ContributorsIsotope Geoscience Unit, Scottish Universities Environmental Research Centre, East Kilbride, Department of Earth & Environmental Science, University of St Andrews, St Andrews, School of Environmental Sciences, University of East Anglia, Norwich, Department of Natural Sciences, University of Derby, Derby, School of History, University of East Anglia, Norwich, British Geological Survey, The Lyell Centre, Edinburgh, Department of Earth Sciences, Durham University, Durham and TIA Systems Ltd., Cheadle
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