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Journal of the Geological Society; 1994; v. 151; issue.6; p. 1017-1021;
DOI: 10.1144/gsjgs.151.6.1017
© 1994 Geological Society of London

Article

Sm–Nd isotopic characteristics of sedimentary provenance: the Windermere Supergroup of NW England

W. D. McCAFFREY

Department of Earth Sciences, University of Leeds, Leeds LS2 9JT, U.K

Nd model ages of Windermere Supergroup sediments increase from the upper Ashgill to the upper Ludlow. Below the lower Llandovery, increasing tDM reflects mixing between the underlying Borrowdale Volcanic Group and hemipelagic detritus, possibly sourced from the Lauren-tian margin. The ongoing rise of tDM into the upper Ludlow probably reflects the growing influence of sediment sourced from the Scandian Orogen. A Pøiadoli drop in tDM is interpreted as recording the re-establishment of supply from the local Laurentian margin: north to south sediment dispersal indicating the effective demise of the Iapetus Ocean as a barrier to sediment dispersal.




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