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Journal of the Geological Society

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A reinterpretation of the genesis of the Cae Coch pyrite deposit, North Wales

Department of Earth Sciences, University of Leeds, Leeds LS2 9JT, UK

Data are presented on sulphur isotope ratios and Co/Ni ratios of samples from both the Cae Coch massive pyrite body and the adjacent lithologies in North Wales. The majority of the pyrite has light ³⁴S (-20 to -24 _CDT) indicative of a predominantly biogenic sulphur source; a minority of heavier values are interpreted as the result of sulphate depletion during the last stages of bacterial sulphide production. These values are far lighter than from volcanic-associated, exhalative massive sulphide deposits found in similar geological settings elsewhere, and Co/Ni ratios at Cae Coch (0.2-0.5) are also far lower than usual for such deposits. An alternative syn-diagenetic inhalative origin is proposed for the sulphide mineralization at Cae Coch.

This article has been cited by other articles:

				D. Lowry, A. J. Boyce, A. E. Fallick, W. E. Stephens, and N. V. Grassineau Terrane and basement discrimination in northern Britain using sulphur isotopes and mineralogy of ore deposits Geological Society, London, Special Publications, January 1, 2005; 248(1): 133 - 151. [Abstract] [PDF]