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Journal of the Geological Society

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Pb-isotope evidence for the role of Mesozoic basins in the genesis of Mississippi Valley-type mineralization in Somerset, UK

Ancient Metallurgy Research Group, Department of Archaeological Sciences, University of Bradford BD7 1DP, UK

The Mendip–Bristol veinfield is one of a number of British Mississippi Valley-type deposits, the genesis of which has never been fully explained. The Mendip–Bristol Pb-Zn–Ba vein mineralization is hosted in Carboniferous, Permo-Triassic and Jurassic sediments. The metal sources involved during mineralization were investigated using Pb-isotope analysis of vein galenas.²⁰⁶Pb/²⁰⁶pb values range from 18 311 to 18.594,²⁰⁷Pb/²⁰⁴Pb values from 15.601 to 15.688 and ²⁰⁸Pb/²⁰⁴Pb values from 38.257 to 38.565. The data show three isotopically different mineralizing fluids, which it is suggested reflect fluid expulsion from adjacent Mesozoic sedimentary basins, as a result of overpressuring due to rapid subsidence in the Triassic–Jurassic.

KEYWORDS: Mendip Hills, Mississippi Valley-type, mineral deposits, genesis, lead, isotopes

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