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Scientific Communications |
Scottish Universities Environmental Research Centre, Rankine Avenue, East Kilbride, Glasgow G75 0QF, Scotland
Outokumpu Tara Mines Ltd, Knockumber, Navan, County Meath, Ireland
Scottish Universities Environmental Research Centre, Rankine Avenue, East Kilbride, Glasgow G75 0QF, Scotland
Corresponding author: e-mail,
a.boyce{at}suerc.gla.ac.uk
We report sulfur and lead isotope analyses of mine
concentrates from Navan, the largest zinc deposit in Ireland. These samples,
each representing up to a million tonnes of ore, show very limited isotopic
variation, with mean 
34S
= –13.6
± 2 per
mil (n =
20), and galena concentrate mean 206Pb/204Pb = 18.19 ±
0.03 (n =
7). Calculations suggest >90 percent of the Navan sulfides were derived
through bacteriogenic reduction of Mississippian seawater sulfate, whereas
metals were acquired from a local, orogenic crustal source beneath the
orebody. Enhanced bacterial activity was fundamental to ore deposition at
Navan: no bacteria, no giant ore deposit.
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