Ore mineralogy of the mesothermal gold lodes of the Dolgellau gold belt, North Wales

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doi: 10.1179/037174502765188600
Authors:Mason, J. S.; Bevins, R. E.; Alderton, D. H. M.
Volume Title:Transactions - Institution of Mining and Metallurgy. Section B: Applied Earth Science
Source:Transactions - Institution of Mining and Metallurgy. Section B: Applied Earth Science, Vol.111, p.203-214. Publisher: Institution of Mining and Metallurgy, London, United Kingdom. ISSN: 0371-7453
Publication Date:2002
Note:In English. 35 refs.; illus., incl. 3 tables, sketch map
Summary:The auriferous quartz-sulphide veins of the Dolgellau gold belt represent the finest example of a pre-Acadian, mesothermal gold-lode metallogenic province in the United Kingdom. The gold lodes are composite, multistage, ribbon-quartz bodies occupying shear zones in clastic marine sedimentary rocks, including black mudstones, of Middle to Upper Cambrian age and in associated altered, basic-intermediate intrusives. Petrological studies have revealed a complex history of multiphase mineralization and anomalously pervasive hydrothermal alteration. The mesothermal gold-lode mineralization has a four-stage paragenetic sequence comprising early Fe-Co-As followed by localized, bonanza-style Au-Ag-Bi-Te-Pb. Stage three is Cu-Fe-dominated, whereas the final stage is dominated by Pb-Zn. Quartz and carbonates accompany all stages, their relative abundances varying considerably from locality to locality. The textural relationships of the ore minerals have been partially modified by post-depositional processes related to regional, strain-related metamorphism and Acadian deformation, but the veins still reveal a consistent regional paragenesis, a detailed account of which is published here for the first time. A discussion of the redefined paragenetic sequence of the gold lodes is followed by a reinterpretation of the extensive existing pool of previously published analytical data.
Sections:Economic minerals and ore deposits
Subsections:Metallic deposits: specific
Subjects:Base metals; Copper ores; Framework silicates; Gold ores; Mesothermal processes; Metal ores; Mineral deposits, genesis; Mineralization; Molybdenum ores; Quartz; Silica minerals; Silicates; Sulfides; Europe; Great Britain; United Kingdom; Wales; Western Europe; Clogau Formation; Dolgellau Belt; North Wales
Coordinates:N300000 N300000 W0650000 W0650000
Abstract Numbers:03M/3702
Record ID:2003062933
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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