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Temporal and spatial evolution of the Neogene age Breiğdalur central volcano through 39Ar/40Ar and U-Pb age determination
Citation
Askew, RA and Thordarson, T and Gans, P and Thompson, J and Danyushevsky, L, Temporal and spatial evolution of the Neogene age Breiodalur central volcano through 39Ar/40Ar and U-Pb age determination, Journal of Volcanology and Geothermal Research, 404 Article 107006. ISSN 0377-0273 (2020) [Refereed Article]
Copyright Statement
Copyright © 2020 Elsevier B.V. All rights reserved
DOI: doi:10.1016/j.jvolgeores.2020.107006
Abstract
The volcanic sequences in eastern Iceland provide a cross-section of magmatic activity from the Iceland rift system throughout the Miocene. This study focuses on a high precision age determination campaign of a single Miocene volcanic system, the Breiğdalur central volcano and associated dyke swarm, in order to quantify its evolution. The central volcano consists of: a lower flank of mafic lavas erupted onto a basement of plateau basalts; an upper flank of intermediate and mafic lavas; an 8–10 km wide caldera with associated infill formations; and a summit sequence of lavas and tuffs. This study indicates that the central volcano had a lifespan of around 1 My, from 10.2–9.1 Ma, and started with mafic magmatism. Intermediate magmatism began around 10.04 Ma and the caldera formed between 9.8 and 9.5 Ma, evolving via multiple nested-caldera collapses. Effusive silicic magmatism was predominantly in the youngest sequences between 9.5 and 9.1 Ma. After 9.1 Ma the activity at the central volcano effectively ceased. The volcano became buried by plateau basalt sequences predominantly derived from eruptions at the associated Breiğdalur dyke swarm. Activity on the dyke swarm began around 9.9 Ma and continued to until 7.8 Ma, an additional 1.3 My.
Item Details
Item Type: | Refereed Article |
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Keywords: | volcano geology, volcano stratigraphy, geochronology, Iceland |
Research Division: | Earth Sciences |
Research Group: | Geology |
Research Field: | Geochronology |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the earth sciences |
UTAS Author: | Thompson, J (Mr Jay Thompson) |
UTAS Author: | Danyushevsky, L (Professor Leonid Danyushevsky) |
ID Code: | 144703 |
Year Published: | 2020 |
Funding Support: | Australian Research Council (IH130200004) |
Web of Science® Times Cited: | 1 |
Deposited By: | CODES ARC |
Deposited On: | 2021-06-06 |
Last Modified: | 2021-07-28 |
Downloads: | 0 |
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