The identification of various types of geochemical stream sediment anomalies in Northern Ireland

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doi: 10.1016/0375-6742(79)90013-X
Authors:Butt, C. R. M.; Nichol, I.
Author Affiliations:Primary:
Queen's Univ., Dep. Geol. Sci., Kingston, Ont., Canada
Volume Title:Journal of Geochemical Exploration
Source:Journal of Geochemical Exploration, 11(1), p.13-32. Publisher: Elsevier, Amsterdam-New York, International. ISSN: 0375-6742
Publication Date:1979
Note:In English. 26 refs.; illus. incl. tables, geol. sketch map
Summary:A stream-sediment survey of County Tyrone and parts of adjacent counties, in which there are Pb-Zn-Cu veins in Ordovician-Silurian sediments near Keady and mineral occurrences in the Dalradian and Devonian, involved sampling at a mean density of 1 sample per 2.5 km2 and routine analysis for Ag, Co, Cu, Fe, Mn, Mo, Pb and Zn by emission spectrography, and subsequently for Cu, Pb and Zn by AAS. Three types of base-metal anomalies were found: significant clastic anomalies with anomalous concentrations of Zn, Cu, Pb, + or -Fe, Mn, Ba, Co, Mo, As, significant hydromorphic anomalies with Zn + or - Mn, Fe, Pb, Cu, Ba, Co, Ni, Mo, As, and non-significant hydromorphic anomalies with Zn, Mn, Fe, Co, + or -Ba, Ni, As and Mo. The significant clastic anomalies are present in the Keady area only, whereas significant hydromorphic anomalies occur near Barons Court associated with galena-sphalerite-baryte veins and disseminated galena in Dalradian schists. Non-significant hydromorphic anomalies are more widespread, occurring in the Low Sperrins, Sperrin Mountains and other areas, and are due to leaching of Zn from acid and/or gleyed soils and subsequent concentration by coprecipitation with Mn oxides. Such anomalies can be identified by their Zn/Mn ratio. [R.J.L.C.]
Subjects:Anomalies; Base metals; Copper ores; Data; Economic geology; Exploration; Geochemical methods; Lead ores; Lead-zinc deposits; Metal ores; Mineral exploration; Sampling; Sediments; Stream sediments; Trace elements; Zinc ores; Europe; Northern Ireland; United Kingdom; Western Europe; Ore deposits
Coordinates:N541000 N545000 W0063000 W0074500
Abstract Numbers:83M/0605
Record ID:1979027130
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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