Biogeochemical orientation surveys, Reefton, New Zealand

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Dunn, C.E.; Christie, A.B.; Waldron, H.M. 2012 Biogeochemical orientation surveys, Reefton, New Zealand. Lower Hutt, N.Z.: GNS Science. GNS Science report 2012/25 60 p. + 1 CD

Abstract: Biogeochemical orientation surveys were conducted in two areas near Reefton – the T38 target (T38) and the Blackwater Creek (Waiuta) prospects, both potential orogenic gold quartz vein systems. Six common plant species were sampled: black beech (Nothofagus solandri), red beech (Nothofagus fusca), silver beech (Nothofagus menziesii), Westland quintinia (Quintinia acutifolia), ferns (Blechnum spp.) and rimu (Dacrydium cupressinum). Sampling was conducted over a 4 day period and generated a collection of 241 samples. Data in this report are from the analysis for 53 elements in 169 of these samples. At the T38 target prospect, foliage from three species of beech was analysed and the element distributions plotted. Differences in element uptake by the three species required the data to be levelled (response ratios) before plotting. Two northwesterly trending zones of enrichment were identified, one with coincident enrichments in Ca, Ba, As, Sb, Cu, Li, Cs and Rb, and the other with coincident enrichments in Au, Co, Mo, Mn, Se, REE and Pb. However, in general, element concentrations were not particularly remarkable, except for one site yielding 4.8 ppb Au, about 50 times background levels of Au (