Mapping of au geochemical anomalies using logratio-transformed stream sediment geochemical data in 1:100000 Feyzaabad sheet,Khorasan Razavi,Iran

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 ilrtransformed 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. © 2015,national centre of excellence in geology. all rights reserved.