Comparative study of analytical methods in geochemical data optimization, Ghoulan area, E-Azarbaijan

Subject Areas :

حمید SHahinfar ¹ (استادیار دانشگاه آزاد اسلامی، واحد تبریز)

Received: 2016-09-07 Accepted : 2016-09-07 Published : 2011-12-22

Keywords: Geochemical patterns, Favorable potentials, PCA and Fractal method, Ghoulan area,

Abstract :

Detection of optimized geochemical patterns requires Orientation Survey (O.S.) in which one of its importantlayers is selecting an effective data analysis method.In order to detect favorable potentials in Ghoulan area, discrimination of mineralized and blind ore zones usingadvanced techniques with presenting a suitable geochemical pattern and relative pathfinders is the scope of thisstudy. In this respect, 233 stream sediment samples were collected from the area and analyzed for base metals(Cu, Mo, Cr, Co, Ni, Pb, Zn, As, Y …) and their indicator elements.The anomalous zones in the area were detected using two systemic methods such as principal componentanalysis (PCA) and Fractal (F) methods. Application of F method on geochemical data leads to detection of twoanomalous zones of Cu in Gharachilar and W-Loutkeh, with Mo appearance in Namnigh. The separation ofthese two anomalous zones (Cu& Mo) probably is due to acidity of area formed by solubility of sulphides fromoutcrops and migration of Mo in the form of molibdate which caused the precipitation of Cu and Mo in twodifferent zones.The results show that both methods (F&PCA) have similar detection zones but the capability of PCA inenhancement of halos and detection of blind ore zones is more effective than F method. As in this case, it coulddetect strong blind anomalous zone of Mo in Namnigh in addition to Cu & Mo trend. Overall, thecharacterization of methods also revealed that the PCA is more reliable in rejecting the syngenetic effects and theresults can be more precisely used in the area.