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

2018; Geological Society of America; Volume: 46; Issue: 12 Linguagem: Inglês

10.1130/g45415.1

1943-2682

Katie Preece, Darren F. Mark, Jenni Barclay, B. E. Cohen, Katy J. Chamberlain, Claire Jowitt, Charlotte Vye-Brown, Richard J. Brown, Scott Hamilton,

Pacific and Southeast Asian Studies

Research Article| November 09, 2018 Bridging the gap: 40Ar/39Ar dating of volcanic eruptions from the 'Age of Discovery' Katie Preece; Katie Preece * 1Isotope Geoscience Unit, Scottish Universities Environmental Research Centre, East Kilbride G75 0QF, UK *E-mail: Katie.Preece@glasgow.ac.uk Search for other works by this author on: GSW Google Scholar Darren F. Mark; Darren F. Mark 1Isotope Geoscience Unit, Scottish Universities Environmental Research Centre, East Kilbride G75 0QF, UK2Department of Earth & Environmental Science, University of St Andrews, St Andrews KY16 9AJ, UK Search for other works by this author on: GSW Google Scholar Jenni Barclay; Jenni Barclay 3School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK Search for other works by this author on: GSW Google Scholar Benjamin E. Cohen; Benjamin E. Cohen 1Isotope Geoscience Unit, Scottish Universities Environmental Research Centre, East Kilbride G75 0QF, UK Search for other works by this author on: GSW Google Scholar Katy J. Chamberlain; Katy J. Chamberlain 4Department of Natural Sciences, University of Derby, Derby DE22 1GB, UK Search for other works by this author on: GSW Google Scholar Claire Jowitt; Claire Jowitt 5School of History, University of East Anglia, Norwich NR4 7TJ, UK Search for other works by this author on: GSW Google Scholar Charlotte Vye-Brown; Charlotte Vye-Brown 6British Geological Survey, The Lyell Centre, Edinburgh EH14 4AP, UK Search for other works by this author on: GSW Google Scholar Richard J. Brown; Richard J. Brown 7Department of Earth Sciences, Durham University, Durham DH1 3LE, UK Search for other works by this author on: GSW Google Scholar Scott Hamilton Scott Hamilton 8TIA Systems Ltd., Cheadle, Cheshire SK8 1LJ, UK Search for other works by this author on: GSW Google Scholar Geology (2018) 46 (12): 1035–1038. https://doi.org/10.1130/G45415.1 Article history received: 09 May 2018 rev-recd: 03 Oct 2018 accepted: 08 Oct 2018 first online: 09 Nov 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Katie Preece, Darren F. Mark, Jenni Barclay, Benjamin E. Cohen, Katy J. Chamberlain, Claire Jowitt, Charlotte Vye-Brown, Richard J. Brown, Scott Hamilton; Bridging the gap: 40Ar/39Ar dating of volcanic eruptions from the 'Age of Discovery'. Geology 2018;; 46 (12): 1035–1038. doi: https://doi.org/10.1130/G45415.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search 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. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.