Isotopic data on the metal-source regions for the Llanrwst Pb-Zn orefield, North Wales

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Authors:Haggerty, R.; Bottrell, S. H.; Cliff, R. A.
Author Affiliations:Primary:
Univ. Leeds, Leeds, United Kingdom
Université de Nancy I, France
Volume Title:Source, transport and deposition of metals
Volume Authors:Pagel, Maurice, editor; Leroy, Jacques L.
Source:p.285-286; 25th anniversary meeting of the Society for Geology Applied to Mineral Deposits, Nancy, France, Aug. 30-Sept. 3, 1991, edited by Maurice Pagel and Jacques L. Leroy. Publisher: A. A. Balkema, Rotterdam, Netherlands
Publication Date:1991
Note:In English. 6 refs.
Summary:The Pb-Zn veins in this orefield are hosted in Ordovician rocks. K- Ar and Rb-Sr dating of altered wall-rock material indicates a Devonian age for the mineralization which is consistent with a regional mineralizing episode that occurred during the waning stage of the Caledonian orogeny. Sr-isotope data from the vein carbonates have values of 0.70985 +- 2-71087 +- 2, with the more radiogenic values occurring later in ore deposition. Pb isotope data from galenas show a homogeneous or well-mixed source for the Pb. The proposed ore genesis model for the orefield involves basinal dewatering from the adjacent Silurian basin, with basinal metal-rich brines being focused into the Ordovician rocks via active faults. [R.E.S.]
Subjects:Alkaline earth metals; Basins; Brines; Devonian; Economic geology; Geochemistry; Interpretation; Isotopes; Lead; Lead ores; Lead-zinc deposits; Metal ores; Metals; Mineral deposits, genesis; Mineralization; Models; Ore-forming fluids; Paleozoic; Pb-206/Pb-204; Pb-207/Pb-204; Pb-208/Pb-204; Provenance; Radioactive isotopes; Sr-87/Sr-86; Stable isotopes; Strontium; Zinc ores; Europe; Great Britain; United Kingdom; Wales; Western Europe; Llanrwst orefield; Northern Wales
Abstract Numbers:93M/307
Record ID:1992080153
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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