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Pb-isotope evidence on the origin of the West Shropsh orefield, England

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  • Pb-isotope data on ore galenas from the West Shropshire orefield show a significant spread of ²⁰⁶pb/²⁰⁴pb values, with minor variation in ²⁰⁷Pb/²⁰⁴Pb and ²⁰⁸Pb/²⁰⁴Pb ratios. These indicate that lead was derived from multiple sources, some of them uranium-enriched and incompletely mixed prior to ore deposition. Four possible mineralizing agents are considered: circulating sea-water, metamorphic waters, basinal brines and convecting formation waters. Pb-isotope data exclude a circulating sea-water origin for the mineralization, and best support a convecting formation water mineralizing agent. A model involving a single fluid tapping multiple lead sources is proposed to explain the observed Pb-isotope variation.
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  • Haggerty, R., Rohl, B. M., Budd, P. D., & Gale, N. H. (1996). Pb-isotope evidence on the origin of the West Shropsh orefield, England. Geological Magazine, 133(5), 611-617. doi:10.1017/S0016756800007883
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  • 133
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  • 5
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