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Quarterly Journal of Engineering Geology and Hydrogeology
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Quarterly Journal of Engineering Geology and Hydrogeology; 2008; v. 41; issue.1; p. 119-120;
DOI: 10.1144/1470-9236/07-030
© 2008 Geological Society of London

Discussion

Discussion of ‘A proposed conceptual model for the genesis of the Derbyshire thermal springs’ by F. C. Brassington, Quarterly Journal of Engineering Geology and Hydrogeology, 40, 35–46

S. Bottrell1, D. Lowe2, J. Gunn2, S. Worthington3 & F. C. Brassington4

1 Institute of Geological Sciences, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK (s.bottrell@see.leeds.ac.uk)
2 Limestone Research Group, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, UK
3 Limestone Research Group GEES (School of Geography, Earth & Environmental Sciences) University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
4 Worthington Groundwater, 55 Mayfair Avenue, Dundas, Ontario, Canada, L9H 3K9
5 Consultant Hydrogeologist, 12 Culcheth Hall Drive, Culcheth, Warrington WA3 4PS, UK (rick@brassingtonhydrogeology.co.uk)

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S. Bottrell, D. Lowe, J. Gunn & S. Worthington write: We read with interest the hydrogeological analysis of the thermal waters rising from Dinantian limestones in Derbyshire presented by Brassington (2007) and note the similarities to a similar analysis by Gunn et al. (2006). Their analysis of deep thermal groundwater flows used similar geological reasoning and arrived at rather similar overall conclusions and a closely comparable conceptual model. The flow paths suggested in both works that are derived on a geological basis are confirmed by consideration of new data on sulphate stable isotopes ({delta}34S and {delta}18O) and Sr isotopes on thermal and non-thermal waters presented by Gunn et al. (2006), although there are also some differences, particularly with respect to the Buxton waters.

Chemical and isotopic compositions exhibited by the Buxton thermal waters differ markedly from those of the waters from other thermal risings and imply that a significant component of flow has interacted with non-limestone lithologies. The low Ca concentration and calcite saturation index of only 0.08 (Christopher 1981) are certainly atypical of limestone spring waters. Elevated radiogenic 87Sr content above those for all other thermal and non-thermal waters (together with, for example, high Mg and Mn concentrations as noted by Edmunds (1971)) indicate interaction of the deep Buxton flows with overlying sandstone aquifers at the limestone contact under the Goyt Syncline. Indeed, from the geochemical evidence, flow via sandstone aquifers in the Goyt Syncline could be a significant source of . . . [Full Text of this Article]