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 δ34S (-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 content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not have access to this content, please speak to your institutional administrator if you feel you should have access.