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An improved chronology for the Arthur's Seat Volcano and Carboniferous magmatism of the Midland Valley of Scotland

Alison A. Monaghan, Mike A. E. Browne and Dan N. Barfod
An improved chronology for the Arthur's Seat Volcano and Carboniferous magmatism of the Midland Valley of Scotland
Scottish Journal of Geology (October 2014) 50 (2): 165-172

Abstract

The Early Carboniferous Arthur"s Seat volcano in central Edinburgh is of geological significance and landscape value but lacks a precise chronology. New (super 40) Ar/ (super 39) Ar step-heating plateau analyses date the lowest Lava 1 of the eruptive sequence to 341.2+ or -0.8 Ma (Visean, Holkerian), with Lava 3a at 336.7+ or -4.7 Ma. Intrusive or lava-lake basalts within the Lion's Haunch Vent are precisely dated at 338+ or -0.6 Ma at Dunsapie and 335.1+ or -0.6 Ma at Crow Hill (Visean, Asbian). Taken together with existing (super 40) Ar/ (super 39) Ar dates recalculated to recent decay constant and standard values, and U/Pb dates, a revised magmatic chronology consistent with biostratigraphy is presented for the Midland Valley of Scotland. The Garleton Hills Volcanic Formation is older than the Arthur's Seat Volcanic Formation, whereas the Clyde Plateau and Arthur's Seat volcanic formations are partly coeval, requiring minor re-adjustments to existing stratigraphy.


ISSN: 0036-9276
EISSN: 2041-4951
Coden: SJGEAX
Serial Title: Scottish Journal of Geology
Serial Volume: 50
Serial Issue: 2
Title: An improved chronology for the Arthur's Seat Volcano and Carboniferous magmatism of the Midland Valley of Scotland
Affiliation: British Geological Survey, Edinburgh, United Kingdom
Pages: 165-172
Published: 201410
Text Language: English
Publisher: Geological Society Publishing House for the Geological Societies of Edinburgh and Glasgow, Bath, United Kingdom
References: 33
Accession Number: 2014-105157
Categories: GeochronologyStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch map
N55°55'60" - N55°55'60", W03°10'00" - W03°10'00"
Secondary Affiliation: Scottish Universities Environmental Research Centre, GBR, United Kingdom
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201452
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