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

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Authors:Haggerty, R.; Rohl, B. M.; Budd, P. D.; Gale, N. H.
Author Affiliations:Primary:
University of Bradford, Bradford, United Kingdom
Other:
University of Oxford, United Kingdom
Volume Title:Geological Magazine
Source:Geological Magazine, 133(5), p.611-617. Publisher: Cambridge University Press, London, United Kingdom. ISSN: 0016-7568
Publication Date:1996
Note:In English. 30 refs.; illus., incl. 1 table, geol. sketch map
Summary: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 results indicate that lead was derived from multiple sources, some enriched in U 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 are considered to give best support for convecting formation water as the mineralizing agent. A model involving a single fluid tapping multiple lead sources is suggested to explain the observed Pb-isotope variation. [R.A.H.]
Subjects:Base metals; Copper ores; Fluid phase; Galena; Host rocks; Isotopes; Lead; Lead-zinc deposits; Lower Paleozoic; Metal ores; Metals; Mineral deposits, genesis; Paleozoic; Pb-206/Pb-204; Pb-207/Pb-204; Pb-208/Pb-204; Radioactive isotopes; Stable isotopes; Sulfides; England; Europe; Great Britain; Shropshire England; United Kingdom; Western Europe; Shelve Inlier; West Shropshire orefield
Abstract Numbers:97M/1651
Record ID:1997010792
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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