Applied geochemical studies in the Eybek Dag region of north-west Turkey.

A geochemical study of the Eybek Dag igneous mass of north-west Turkey and its mineralized surroundings is described. The results of chemical analyses of rocks, soils and stream sediments of the are are presented, together with computerised data processing and statistical analyses of this information. Colorimetric, spectrometric, x-ray fluoresence and flame-photometric methods of analysis were employed for rocks but only colorimetric methods were used for the soils and stream sediments. The wall-rocks of four ore-deposits, as well as some dyke material, were also analysed by the spectrometric method. The analytical data are presented as population distribution maps, each population being separated by the probability paper technique. The data are also evaluated by cluster and principal components analyses. Instead of the conventional graphical presentation, the Q-mode results of the principal components analysis are clustered using a distance matrix based on the vector scores. Using the observed primary and secondary dispersion patterns, significant geochemical differences between the two main batholiths of the igneous mass are shown, and the relationships between such patterns and known mineralization are defined. The use of these patterns in investigating the mechanisms of ore deposition is also investigated, and the application of the various geochemical techniques described (particularly rock chemistry) to mineral exploration is discussed.