Ophiolitic detritus in the Ordovician sediments of South Mayo, Ireland

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doi: 10.1144/gsjgs.146.2.0213
Authors:Wrafter, John P.; Graham, John R.
Author Affiliations:Primary:
Univ. Coll., Dep. Geol., Dublin, Ireland
Trinity Coll., Ireland
Volume Title:Journal of the Geological Society of London
Source:Journal of the Geological Society of London, 146(2), p.213-215. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:1989
Note:In English. 21 refs.; illus. incl. geol. sketch map
Summary:Sandstones from Ordovician sediments of the South Mayo trough, western Irish Caledonides, show marked stratigraphic variation in their major- and trace-element geochemistry. High Cr, Ni and Mg concentrations of ultramafic derivation succeed high Ti and Fe of mafic provenance. This sequence is interpreted as the result of the progressive unroofing of an ophiolite. A possible sedimentary linkage with ophiolite lithologies in the Clew Bay complex to the north would indicate minimal post-Arenig transcurrent displacement. The South Mayo flysch with its ophiolitic detritus is typical of Caledonian flysch sequences which pre-date the mid-Ordovician Taconic deformation, but differs in character from those of late Ordovician age. [R.A.H.]
Subjects:Clastic rocks; Geochemistry; Ophiolite; Ordovician; Paleozoic; Sandstone; Sedimentary petrology; Sedimentary rocks; Stratigraphy; Trace elements; Caledonides; Europe; Ireland; Mayo Ireland; Western Europe
Abstract Numbers:89M/2474
Record ID:1989048183
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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