Pb-Zn and minor U mineralization at Tyndrum, Scotland

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Authors:Pattrick, R. A. D.
Author Affiliations:Primary:
Univ. Manchester, Dep. Geol., Manchester, United Kingdom
Volume Title:Mineralogical Magazine
Source:Mineralogical Magazine, 49 Part 5(354), p.671-681. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0026-461X
Publication Date:1985
Note:In English. 52 refs.; illus. incl. 3 tables, sketch map
Summary:The Tyndrum Pb-Zn mineralization occurs as veins and vein breccias in NE-SW trending fractures associated with the Tyndrum-Glen-Fyne fault. The major minerals are quartz, galena, and sphalerite with minor chalcopyrite and baryte. Tetrahedrite (sometimes silver-and cadmium-rich), pyrargyrite, marcasite, and pyrite occur as small inclusions (< 100 µm) in the galena-rich veins. Sphalerite formed early in the depositional sequence, mainly in breccias, with increasing amounts of galena and chalcopyrite deposited in the later vein stages of mineralization. Uraniferous veins post-date the main Pb-Zn mineralization and contain uraninite, calcite, baryte, galena, sphalerite, chalcopyrite, argentite, chalcocite, tetrahedrite, and safflorite. Fluid inclusion studies reveal that the mineralizing solutions contained c.20 wt. % equivalent NaCl + KCl, had an Na/K ratio of 3 : 1 and were boiling during mineral precipitation. The Tyndrum fault controlled the upward flow of the hydrothermal solutions and its intersection with fractures in quartzites favoured the siting of the veins. The depositional sequence is explained by an increase in temperature during the mineralizing episode. The uraniferous veins may be a late oxidized stage of the main Pb-Zn mineralization. [R.A.H.]
Subjects:Economic geology; Fluid inclusions; Geochemistry; Geologic thermometry; Hydrothermal alteration; Inclusions; Lead-zinc deposits; Metal ores; Metasomatism; Mineral composition; Mineral deposits, genesis; Ore-forming fluids; Processes; Structural controls; Textures; Uranium ores; Europe; Great Britain; Scotland; United Kingdom; Western Europe; Hydrothermal processes; Tyndrum; Tyndrum-Glen Fyne Fault
Coordinates:N562500 N563000 W0044000 W0045000
Abstract Numbers:86M/0386
Record ID:1986032736
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland
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