Geochemistry and potential correlation of Silurian (Telychian) metabentonites from Ireland and SW Scotland

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doi: 10.1002/gj.940
Authors:Batchelor, R. A.; Harper, D. A. T.; Anderson, T. B.
Author Affiliations:Primary:
University of Saint Andrews, School of Geography and Geosciences, Saint Andrews, United Kingdom
Geologisk Museum, Denmark
Queen's University, United Kingdom
Volume Title:Geological Journal
Source:Geological Journal, 38(2), p.161-174. Publisher: Wiley & Sons, Chichester, United Kingdom. ISSN: 0072-1050
Publication Date:2003
Note:In English. 41 refs.; illus., incl. 2 tables, geol. sketch map
Summary:New occurrences of metabentonites from the Telychian Stage of the Silurian successions in SW Scotland, Co. Down and Co. Mayo, Ireland, are described in terms of their biostratigraphical setting and geochemical characteristics. The Co. Mayo occurrence extends the known distribution of Telychian metabentonites in Europe by 280 km WSW from the coast of Co. Down. Comparisons between samples based on selected trace element ratios suggest three potential correlations. One is between a tuffaceous clay from the Finny School Member, Upper Kilbride Formation of Co. Mayo, and a metabentonite from the Tara Sandstone Formation, Gala Group, Co. Down. One pair of metabentonites from the Carghidown Formation of Kirkcudbrightshire can be related to one pair from the Ardglass Formation of Co. Down. In addition, a unique alkaline chemical composition is identified in two samples from the Kirkmaiden Formation of Kirkcudbrightshire and one sample from the Ballyquintin Formation of Northern Ireland, which implies the existence of a local extensional tectonic regime at that time, consistent with a back-arc basin. These metabentonites extend across at least two Caledonian suspect terranes and a variety of different sedimentary facies. These data may assist future discoveries and be able to improve stratigraphic correlations across three terranes.
Subsections:Sedimentary petrology
Subjects:Biostratigraphy; Chemical composition; Correlation; Graptolithina; Graptoloidea; Lithostratigraphy; Llandovery; Lower Silurian; Metabentonite; Monograptina; Monograptus; Paleozoic; Silurian; Spectra; Telychian; X-ray fluorescence spectra; Caledonides; Europe; Galloway Scotland; Great Britain; Ireland; Mayo Ireland; Northern Ireland; Scotland; United Kingdom; Western Europe; Ardglass Formation; Ballyquintin Formation; Carghidown Formation; Down Northern Ireland; Kilbride Formation; Kirkmaiden Formation; Sandstone Formation; Strathclyde region Scotland
Coordinates:N533500 N533500 W0093000 W0093000
N541500 N541500 W0053000 W0053000
N544500 N551500 W0043000 W0050000
Abstract Numbers:04M/246
Record ID:2003082465
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom
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