Mapping of Au geochemical anomalies using logratio-transformed stream sediment geochemical data in 1:100000 Feyzaabad sheet, Khorasan Razavi, Iran
Keywords:
Compositional data; Log-ratio transformations; Concentration-area plots; Au anomalies; Feyzaabad; IranAbstract
In the present study, analyses of log- and logratio-transformation of stream geochemical data of Au in
1:100000 Feyzaabad sheet are compared with each other. Logratio (alr, clr, or ilr) transformations, compared to log-transformation, of stream sediment geochemical data improve mapping of Au anomalies which indicates presence of mineralization. Particularly, the anomaly maps of Au derived from clr- or ilr- transformed stream sediment geochemical data are better, than the anomaly maps of Au derived from log- or alr-transformed data. The results of the study suggest that stream sediment geochemical data in the study area should be clr- or ilr- transformed to enhance recognition of anomalous multi-element associations reflecting the presence of mineralization. The enhancement of anomalous multi-element associations is the most important benefit of either clr- or ilr-transformation compared to either ln- or alr-transformation of stream sediment geochemical data.
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