Ag-Au-Te mineralization in the Ratagain Complex, Northwest Scotland

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Authors:Alderton, D. H. M.
Author Affiliations:Primary:
R. Holloway and Bedford New Coll., Dep. Geol., London, United Kingdom
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.97, p.171-180. Publisher: Institution of Mining and Metallurgy, London, United Kingdom. ISSN: 0371-7453
Publication Date:1988
Note:In English. 57 refs.; illus. incl. 4 tables, geol. sketch map
Summary:This igneous complex consists of diorite, syenite, quartz monzonite and appinite with marked enrichment in Ba, Sr and REE. Mineralization is restricted to the monzonite and occurs in quartz- fluorite-calcite veins, particularly near the Strath Conon fault system. The main ore minerals are pyrite, chalcopyrite, galena and sphalerite; Ag is mainly concentrated in hessite, electrum and galena while Au occurs in electrum. Mo-, Ni-, As- and Bi-bearing phases have also been identified. Fluid inclusion studies indicate that CO2-rich fluids of low to moderate salinity were associated with the mineralization; T was probably >= 300 degrees C. The fluids were also enriched in Na, Ca, K, Ba, Sr and S. The similarity between fluid-inclusion and host-rock chemistry (especially the high Ba and Sr contents) suggests a close association between the hydrothermal fluid and the igneous rocks. It is tentatively suggested that the fluids had a dominantly magmatic origin. The origin of the Au, Ag and other metals may be related to the alkaline nature of the igneous complex. [R.A.H.]
Subjects:Carbon dioxide; Economic geology; Fluid inclusions; Geochemistry; Geologic thermometry; Gold ores; Heavy metals; Hydrothermal alteration; Igneous rocks; Inclusions; Interpretation; Metal ores; Metals; Metasomatism; Mineral deposits, genesis; Mineralization; Paleosalinity; Polymetallic ores; Precious metals; Processes; Quartz veins; Silver ores; Tellurium ores; Veins; Wall-rock alteration; Europe; Great Britain; Scotland; United Kingdom; Western Europe; Hydrothermal processes; Igneous processes; Northwestern Scotland; Ratagain Complex; Strath Conon
Abstract Numbers:89M/3010
Record ID:1989019837
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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