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New major element analyses of proximal tephras from the Azores and suggested correlations with cryptotephras in North-West Europe
Stockholm University, Faculty of Science, Department of Physical Geography.
Stockholm University, Faculty of Science, Department of Physical Geography.
Number of Authors: 32020 (English)In: Journal of Quaternary Science, ISSN 0267-8179, E-ISSN 1099-1417, Vol. 35, no 1-2, p. 114-121Article in journal (Refereed) Published
Abstract [en]

The Azores Archipelago is one of the most active volcanic areas in the North Atlantic region. Approximately 30 eruptions have been reported over the last 600 years with some major VEI 5 (Volcanic Explosivity Index) eruptions further back in time. The geochemical composition of associated tephra-derived glass, however, is not well characterized. An Azorean origin of cryptotephras found in distal areas such as North Africa, the British Isles and Greenland has been suggested, but proximal data from the Azores are scarce and the correlations have only been tentative. These tephras have a traychtic composition, which excludes an Icelandic origin. In a previous study, we presented major element analyses of proximal tephra-derived glass from five Holocene eruptions on the Azores Islands. There is a striking geochemical similarity between tephras from volcanoes on Sao Miguel and Irish cryptotephras, and especially with eruptives from the Furnas volcano. Here we present new analyses of proximal tephras that confirm and strengthen a link between Furnas and cryptotephras found in south-west Ireland. We also suggest a correlation between a previously unsourced tephra found in a Swedish bog with an eruption of the Sete Cidades volcano c. 3880 a cal BP.

Place, publisher, year, edition, pages
2020. Vol. 35, no 1-2, p. 114-121
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-176566DOI: 10.1002/jqs.3155ISI: 000493724200001OAI: oai:DiVA.org:su-176566DiVA, id: diva2:1378896
Available from: 2019-12-16 Created: 2019-12-16 Last updated: 2020-02-20Bibliographically approved

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Wastegård, StefanJohansson, Hans
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