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Title: Regional geochemical variations related to base metal mineralization in Wales
Author: Barrau, F. U.
Awarding Body: University of London
Current Institution: Imperial College London
Date of Award: 1973
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Regional geochemical variations from a multi-element streamsediment reconnaissance survey carried out in the Principality of Wales are described and investigated in relation to base-metal mineralization. A total of 9,910 drainage sediment samples collected at a density of one sample per square mile were analysed by a direct reading emission spectrophotometer, atomic absorption and colorimetric methods for more than twenty elements, of which sixteen were selected as possible indicators of mineralized areas. A moving average technique was employed to smooth errors inherent in the data. The use of percentile class limits was evaluated as a means of data presentation and filter mapping techniques were also applied in delineating anomalous areas. It was recognized that the trace-element distribution reflected known geological and secondary features, as well as mining and mineralization. R-mode factor analysis was applied as a method of elucidating element associations from which the various controlling features were interpreted. R-scores were plotted as smooth mapforms with percentile class limits, delineating the distribution of these controlling features as defined by the element associations. Selection of areas for detailed study was based on the coincidence of favourable geological environments for mineralization with low-order regional geochemical anomalies for single elements, or combinations of metals. Detailed geochemical studies in North Pembrokeshire and Carmarthenshire related marginal regional anomalies of copper, lead and zinc to the presence of undisturbed mineralization, and in Anglesey, glacial dispersion was found to contribute to the size of the anomaly due to the Parys-Mona mineralization. It was shown that multi-element reconnaissance geochemical drainage surveys could be successfully used as mineral exploration tool in areas remote from former mining and industrial activities provided that the interpretation was made on smoothed data. Interpretation based on the geological environment and smoothed element maps was aided by the use of R-mode factor analysis for the classification of metal associations in terms of the controlling features.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available