Geochemical and isotope composition of pebbles from the Caban Conglomerate Formation and their bearing on the source of Welsh Palaeozoic sedimentary rocks

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Authors:Evans, J. A.
Author Affiliations:Primary:
NERC Isotope Geosciences Laboratory, Keyworth, United Kingdom
Other:
British Geological Survey, United Kingdom
Volume Title:Special issue on the Palaeozoic Welsh Basin
Volume Authors:Woodcock, N. H., editor; Fletcher, C. J. N.
Source:Geological Magazine, 129(5), p.581-587; Review meeting on the Welsh Basin, Aberystwyth, United Kingdom, Nov. 15-18, 1991, edited by N. H. Woodcock and C. J. N. Fletcher. Publisher: Cambridge University Press, London, United Kingdom. ISSN: 0016-7568
Publication Date:1992
Note:In English. 20 refs.; illus., incl. 4 tables
Summary:Major, trace and REE geochemistry, together with Nd isotope determinations, provide insights into the provenance of seven pebbles (including granite, granophyre, diorite, basaltic andesite, dacite and tuff) from this Silurian formation in the Welsh Basin. The compositions of the pebbles support their origin by magmatism in a subduction-related environment on an active continental margin. Biotite whole-rock Rb-Sr systematics constrain the age of one granite pebble to 650 +- 38 m.y. The pebbles are the means by which the Nd signature of Proterozoic (Avalonian) basement was introduced into the sedimentary pile. [C.H.D.]
Subjects:Absolute age; Active margins; Basins; Clastic sediments; Dates; Geochemistry; Lithogeochemistry; Major elements; Metals; Paleozoic; Pebbles; Provenance; Rare earths; Rb/Sr; Sedimentary basins; Sediments; Silurian; Sm/Nd; Subduction zones; Trace elements; Europe; Great Britain; United Kingdom; Wales; Welsh Basin; Western Europe; Caban Conglomerate Formation
Coordinates:N513000 N533000 W0024000 W0051000
Abstract Numbers:93M/1850
Record ID:1996005472
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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