High-precision U–Pb geochronology of the Lundy igneous complex: implications for North Atlantic volcanism and the far-field Paleocene–Eocene ash record

Lisica, Karlo ORCID: https://orcid.org/0000-0002-6769-3564; Augland, Lars E. ORCID: https://orcid.org/0000-0001-6033-2734; Stevenson, John A. ORCID: https://orcid.org/0000-0002-2245-1334; Jerram, Dougal A. ORCID: https://orcid.org/0000-0003-0043-4426; Beresford-Browne, Adam ORCID: https://orcid.org/0000-0001-9783-8341; Jones, Morgan T. ORCID: https://orcid.org/0000-0003-3047-0751. 2025 High-precision U–Pb geochronology of the Lundy igneous complex: implications for North Atlantic volcanism and the far-field Paleocene–Eocene ash record. Journal of the Geological Society, 182 (1), jgs2023-140. 10.1144/jgs2023-140

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Official URL: https://doi.org/10.1144/jgs2023-140

Abstract/Summary

The Lundy Island (Bristol Channel, UK) granite is a felsic expression of the southernmost igneous centre of the North Atlantic Igneous Province that emplaced millions of cubic kilometres of magma during the Paleogene. The granite's distinctive S-type, peraluminous, two-mica ± garnet ± tourmaline composition has led to the hypothesis that eruptions from the Lundy volcanic centre may be the source of thick felsic ash layers within the early Eocene Fur Formation (Denmark) that act as key marker horizons for the onset and duration of the Paleocene–Eocene Thermal Maximum. This paper presents high-precision zircon U–Pb emplacement ages of 57.24 ± 0.11/0.12/0.13 Ma for the granite and 55.970 ± 0.021/0.030/0.070 Ma for a felsic ‘lundyite’ dyke. Trace and rare earth element patterns indicate close similarities between late-stage Lundy activity and ash layer −33 in Denmark. This ash layer was deposited during the Paleocene–Eocene Thermal Maximum carbon isotope excursion, suggesting that the Lundy volcanic centre is likely to be the source of this key ash horizon and that magmatism at Lundy likely continued into the early Eocene.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1144/jgs2023-140
ISSN:	0016-7649
Date made live:	15 Jan 2025 15:35 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/538736

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.1144/jgs2023-140

ISSN:

0016-7649

Date made live:

15 Jan 2025 15:35 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/538736