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U-Pb zircon age constraints for the Ordovician Fishguard volcanic group and further evidence for the provenance of the Stonehenge bluestones

Richard Bevins, Nicola Atkinson, Rob Ixer and Jane Evans
U-Pb zircon age constraints for the Ordovician Fishguard volcanic group and further evidence for the provenance of the Stonehenge bluestones
Journal of the Geological Society of London (November 2016) 174 (1): 14-17

Abstract

New U-Pb zircon ages from rhyolite samples of the Fishguard Volcanic Group, SW Wales, confirm a Middle Ordovician (Darriwilian) age for the group. One of the samples is from Craig Rhos-y-felin, which has recently been identified on petrological and geochemical grounds as the source of much of the debitage (struck flakes) at Stonehenge. Analysis of a Stonehenge rhyolite fragment yields an age comparable with that of the Craig Rhos-y-felin sample. Another Stonehenge fragment, thought to come from orthostat (standing stone) 48 and on petrographical grounds to be derived from the Fishguard Volcanic Group (but not Craig Rhos-y-felin), yields an age also consistent with a Fishguard Volcanic Group source.Supplementary material: Details of analytical methods and a table of data are available at https://doi.org/10.6084/m9.figshare.c.3518175


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 174
Serial Issue: 1
Title: U-Pb zircon age constraints for the Ordovician Fishguard volcanic group and further evidence for the provenance of the Stonehenge bluestones
Affiliation: National Museum of Wales, Department of Natural Sciences, Cardiff, United Kingdom
Pages: 14-17
Published: 20161103
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 30
Accession Number: 2016-110978
Categories: GeochronologyIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch map
N51°10'60" - N51°10'60", W01°49'60" - W01°49'60"
N51°59'30" - N51°59'30", W04°44'39" - W04°44'39"
Secondary Affiliation: British Geological Survey, GBR, United KingdomUniversity College London, GBR, United Kingdom
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201652
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