Valentin R. Troll
A large explosive silicic eruption in the British Palaeogene Igneous Province
Troll, Valentin R.; Emeleus, C. Henry; Nicoll, Graeme R.; Mattsson, Tobias; Ellam, Robert M.; Donaldson, Colin H.; Harris, Chris
Authors
C. Henry Emeleus
Graeme R. Nicoll
Tobias Mattsson
Robert M. Ellam
Colin H. Donaldson
Chris Harris
Abstract
Large-volume pyroclastic eruptions are not known from the basalt-dominated British Palaeogene Igneous Province (BPIP), although silicic magmatism is documented from intra-caldera successions in central volcanoes and from small-volume ash-layers in the associated lava fields. Exceptions are the Sgùrr of Eigg (58.7 Ma) and Òigh-sgeir pitchstones in the Inner Hebrides (>30 km apart), which have been conjectured to represent remnants of a single large silicic event. Currently available major element data from these outcrops differ, however, creating a need to test if the two pitchstones are really related. We employ a systematic array of methods ranging from mineralogy to isotope geochemistry and find that samples from the two outcrops display identical mineral textures and compositions, major- and trace elements, and Sr-Nd-Pb-O isotope ratios, supporting that the two outcrops represent a single, formerly extensive, pyroclastic deposit. Available isotope constraints suggest a vent in the Hebridean Terrane and available radiometric ages point to Skye, ~40 km to the North. A reconstructed eruption volume of ≥5km3 DRE is derived, suggesting a VEI 5 event or larger. We therefore argue, contrary to long-held perception, that large-volume silicic volcanism and its associated climatic effects were likely integral to the BPIP during the opening of the North Atlantic.
Citation
Troll, V. R., Emeleus, C. H., Nicoll, G. R., Mattsson, T., Ellam, R. M., Donaldson, C. H., & Harris, C. (2019). A large explosive silicic eruption in the British Palaeogene Igneous Province. Scientific Reports, 9(1), Article 494. https://doi.org/10.1038/s41598-018-35855-w
Journal Article Type | Article |
---|---|
Acceptance Date | Nov 9, 2018 |
Online Publication Date | Jan 24, 2019 |
Publication Date | Jan 24, 2019 |
Deposit Date | Feb 8, 2019 |
Publicly Available Date | Feb 8, 2019 |
Journal | Scientific Reports |
Publisher | Nature Research |
Peer Reviewed | Peer Reviewed |
Volume | 9 |
Issue | 1 |
Article Number | 494 |
DOI | https://doi.org/10.1038/s41598-018-35855-w |
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