Stream sediment geochemical investigation using isometric logratio transformation (ilr) over Takab, NW of Iran

A total 596 stream sediment samples have been carried out from Takab area which is one of the well-knownmineralization zones of northwest of Iran. Geochemical data are typical compositional data which should beopened prior to univariate and multivariate data analysis. In this study an ilr-transformation method has beenapplied to reduce the effect of outliers and censored values. Principle component analysis (PCA) has beenperformed based on ilr-transformed data and 6 significant PCs loaded. With the use of PC maps anomalous areasin the entire region have been suggested for more works such as geochemical rock sampling.

کلیدواژه ها:

censored values ، ilr-transformation ، Ln-transformation ، outlier ، principle component analysis