Stratabound mineralisation in Dalradian rocks near Tyndrum, Perthshire

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doi: 10.1144/sjg22030377
Authors:Fortey, N. J.; Smith, C. G.
Author Affiliations:Primary:
Br. Geol. Surv., London, United Kingdom
Volume Title:Scottish Journal of Geology
Source:Scottish Journal of Geology, 22(3), p.377-393. Publisher: Scottish Academic Press, Edinburgh, United Kingdom. ISSN: 0036-9276
Publication Date:1986
Note:In English. 48 refs.; illus. incl. 2 tables, geol. sketch map
Summary:Two horizons of low-grade stratabound sulphide mineralization occur E of Tyndrum in the Ben Challum quartzite in the Argyll group (Middle Dalradian). The lower horizon exceeds 9 km along strike and averages 1250 ppm Zn and 340 ppm Cu over an 80 m intersection; the upper extends for 4 km and locally contains = or <3.6% Zn and 0.1% Pb over 1 m. Both horizons contain pyrite with minor pyrrhotite, sphalerite and chalcopyrite in quartzite, and contain manganoan almandine. The Ben Challum quartzite is in part highly albitic and includes bands of hornblende schist with tholeiitic composition, some of which probably formed as basic tuff or volcanic sediment. The overlying Ben Lui schist includes rocks carrying talc, magnesite, chromite and Ni sulphide which were probably derived from altered ultramafic rocks. The Zn-Cu-Pb mineralization is considered to be of the sedimentary-exhalative type, deposited during a regime of fault-bounded subsidence prior to the turbiditic sedimentation of the Ben Lui schist. [R.A.H.]
Subjects:Breccia; Clastic rocks; Copper ores; Dalradian; Economic geology; Garnet group; Lead-zinc deposits; Metal ores; Mineral deposits, genesis; Nesosilicates; Orthosilicates; Sedimentary rocks; Silicates; Stratabound deposits; Stratiform deposits; Subsidence; Tholeiitic composition; Europe; Great Britain; Perthshire Scotland; Scotland; United Kingdom; Western Europe; Argyll Group; Ben Challum Quartzite; Ben Lui Schist; Igneous processes; Sedimentary processes; Tyndrum
Abstract Numbers:87M/5674
Record ID:1987060817
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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