Surface lithogeochemical studies about a distal volcanogenic massive sulphide occurrence at Limerick,New South Wales |
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| Authors: | AC Dunlop EP Ambler ET Avila |
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| Institution: | School of Applied Geology, University of New South Wales, Kensington, N.S.W. Australia |
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| Abstract: | The results of a surface rock chip sampling study over a small distal volcanogenic massive sulphide deposit at Limerick, N.S.W., Australia are presented and compared with drill core and soil geochemical patterns. Major element halos are narrow in comparison to the pervasive patterns reported from major proximal deposits. Narrow zones of Mg and K enhancement are associated with sulphide mineralization. High levels of Na occur in these rocks in contrast to the regularly described pattern of Na depletion. Weathering, particularly in the presence of sulphides, has resulted in the leaching of Ca, Na and, to a lesser extent, K from surface rock chip samples, whereas Fe, Pb and Zn contents are enhanced compared to those in fresh rocks. Despite the problems of sample heterogeneity, variable weathering and the limited extent of alteration halos which exist in this environment, surface lithogeochemical methods in comparable situations may be useful in the confirmation and interpretation of soil geochemical anomalies. |
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