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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040 |a ViAlAGI  |c ViAlAGI 
072 7 |a 02C  |2 georeft 
072 7 |a 06A  |2 georeft 
100 1 |a Evans, J. A.  |e analytic author  |u NERC Isotope Geosciences Laboratory, Keyworth 
245 1 0 |a Geochemical and isotope composition of pebbles from the Caban Conglomerate Formation and their bearing on the source of Welsh Palaeozoic sedimentary rocks 
300 |a p. 581-587 
500 |a In English. 20 refs. 
500 |a Abstract number: 93M/1850 
500 |a Abstractor: C.H.D. 
500 |a Affiliation: NERC Isotope Geosciences Laboratory; Keyworth; GBR; United Kingdom 
500 |a Affiliation: British Geological Survey; ; GBR; United Kingdom 
500 |a Key title: Geological Magazine 
500 |a Source note: 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 
500 |a Publication type: conference paper or compendium article 
504 |b 20 refs. 
510 3 |a GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom 
520 |a 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. 
650 7 |a Absolute age  |2 georeft 
650 7 |a Active margins  |2 georeft 
650 7 |a Basins  |2 georeft 
650 7 |a Clastic sediments  |2 georeft 
650 7 |a Dates  |2 georeft 
650 7 |a Geochemistry  |2 georeft 
650 7 |a Lithogeochemistry  |2 georeft 
650 7 |a Major elements  |2 georeft 
650 7 |a Metals  |2 georeft 
650 7 |a Paleozoic  |2 georeft 
650 7 |a Pebbles  |2 georeft 
650 7 |a Provenance  |2 georeft 
650 7 |a Rare earths  |2 georeft 
650 7 |a Rb/Sr  |2 georeft 
650 7 |a Sedimentary basins  |2 georeft 
650 7 |a Sediments  |2 georeft 
650 7 |a Silurian  |2 georeft 
650 7 |a Sm/Nd  |2 georeft 
650 7 |a Subduction zones  |2 georeft 
650 7 |a Trace elements  |2 georeft 
651 7 |a Europe  |2 georeft 
651 7 |a Great Britain  |2 georeft 
651 7 |a United Kingdom  |2 georeft 
651 7 |a Wales  |2 georeft 
651 7 |a Welsh Basin  |2 georeft 
651 7 |a Western Europe  |2 georeft 
653 |a Caban Conglomerate Formation 
700 1 |a Fletcher, C. J. N.,  |e monographic editor  |u British Geological Survey 
711 2 |a Review meeting on the Welsh Basin  |d (1991 :  |c Aberystwyth, United Kingdom)  
773 0 |a Woodcock, N. H., editor  |t Special issue on the Palaeozoic Welsh Basin  |d London : Cambridge University Press, Sep. 1992  |k Geological Magazine  |x 0016-7568  |y GEMGA4  |n 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 type: conference paper or compendium article  |g Vol. 129, no. 5  |h illus., incl. 4 tables