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

Preece, K., Mark, D. F. , Barclay, J., Cohen, B. E. , Chamberlain, K. J., Jowitt, C., Vye-Brown, C., Brown, R. J. and Hamilton, S. (2018) Bridging the gap: 40Ar/39Ar dating of volcanic eruptions from the 'Age of Discovery'. Geology, 46(12), pp. 1035-1038. (doi: 10.1130/G45415.1)

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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.

Item Type:Articles
Additional Information:This work was funded by a Leverhulme Trust Research Project Grant (RPG-2013–042).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Preece, Dr Katie and Mark, Professor Darren and Cohen, Dr Ben
Authors: Preece, K., Mark, D. F., Barclay, J., Cohen, B. E., Chamberlain, K. J., Jowitt, C., Vye-Brown, C., Brown, R. J., and Hamilton, S.
College/School:College of Science and Engineering > School of Geographical and Earth Sciences
College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Geology
Publisher:Geological Society of America
ISSN:0091-7613
ISSN (Online):1943-2682
Published Online:09 November 2018
Copyright Holders:Copyright © 2018 Geological Society of America
First Published:First published in Geology 46(12):1035-1038
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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