Application of gamma-ray spectrometry to prospecting for tin and tungsten granites, particularly within the Lachlan fold belt, New South Wales

Metal Deposits in Relation to Plate Tectonics

“…Unfortunately, neither geochemical nor geophysical techniques have much utility in such situations, although Yeates et al (1982) have reported encouraging results from the application of gamma-ray spectrometry to prospecting for tin and tungsten granites in the Lachlan Fold Belt. Granitic bodies of this class, which exhibit high degrees of differentiation and some postmagmatic alteration, are obvious, broad exploration targets.…”

Quadro Geológico Regional Da Porção Central Do Embasamento Pré-Ordoviciano De Santa Catarina Com Base Em Imagens Landsat-5/Tm E Aerogeofísicas

“…INTERPRETAÇÃO DAS IMAGENS AEROGEOFÍSICAS Os dados aerogeofísicos, originalmente na forma de linhas de vôo, foram convertidos para malhas regulares, a partir das quais foram geradas imagens. As variáveis do campo magnético residual, contagem total (CT), Potássio (K), Urânio (eU) e Tório (eTh) foram tratadas conforme técnicas apresentadas por Ferreira (1982), Yeates et al (1982), Gunn et al (1997), Horsfall (1997), Luyendyk (1997), , Minty et al (1997), Reeves et al (1997), MacLeod & Dobush (2000.…”

Short and long wavelength geophysical features reflecting geology and structure in the Doradilla tin-copper-nickel district, 45 km south-east of Bourke, NSW.

“…The zones may warrant investigation as increased radioelement values are one of the geophysical criteria for granites associated with tin mineralisation (Blevin, 1998), and increased K counts for some alteration assemblages. Yeates et al (1982) found high uranium values associated with Sn and W deposits -whether they are hosted in granite, country rock or even in placers -as Sn, W, Th and U concentrate in K-rich residual melts when granites cool. Their report on the application of gamma ray spectrometry for tin and tungsten prospecting in NSW suggest that U enrichment above 4 pm can help to distinguish intrusions with a suitable degree of fractionation.…”