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Geological Society, London, Special Publications; 1991; v. 57; p. 215-230;
DOI: 10.1144/GSL.SP.1991.057.01.17
© 1991 Geological Society of London

Petrological and geochemical determination of provenance in the southern Welsh Basin

T. McCann

Department of Geology, University of Leicester, University Road, Leicester LE1 7RH, UK
Department of Geology, University College, Belfield, Dublin 4, Ireland

The provenance of Llandeilo to upper Llandovery sediments from the Welsh Basin has been investigated by petrographic and geochemical methods. Sandstone-dominated formations were deposited from high-concentration turbidity currents. Petrographic data suggest derivation from a non-collisional recycled or cratonic setting. This is broadly confirmed by analysis of microconglomerate lithic fragments and the major element geochemistry. Mudstone-dominated formations were deposited from dilute turbidity currents and as hemipelagic sediments. The mudstone geochemistry indicates a tectonic setting transitional between an active continental margin and a passive margin. This study demonstrates that neither set of analytical methods are individually adequate for provenance reconstruction and it is advisable to use a variety of techniques for greater confidence in interpretation.





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R. P. Barnes, G. M. Power, and D. C. Cooper
The definition of sandstone-bearing formations in the Isle of Man and correlation with adjacent areas -- evidence from sandstone chemistry
Geological Society, London, Special Publications, 1999; 160: 139 - 154.
[Abstract] [PDF]