WYZNACZANIE PÓL ANOMALII GEOCHEMICZNYCH Zn W DOLOMITACH KRUSZCONOŚNYCH METODĄ KRIGINGU INDYKATOROWEGO

Abstract

DELIMITATION OF Zn GEOCHEMICAL ANOMALIES IN THE ORE-BEARING DOLOMITES WITH INDICATOR KRIGINGAbstract. The authors present the principles of proper construction of geochemical anomaly (aureoles) contour maps. A non--parametrical geostatistical procedure of indicator kriging has been applied to drawing probability maps that show the areas where a threshold (i.e. minimum) value of the element has been exceeded. Such maps have been prepared to delimit zinc anomalies in ore-bearing dolomites in the NE margin of the Upper Silesian Coal Basin. As the vertical range of intervals with the zinc content exceeding the accepted value of 0.5% has been found to be considerable, horizontal maps of zinc distribution are not sufficient to present correctly its aureoles. The recommended dure includes a three-dimensional variant of indicator kriging in delimiting 3D blocks of geochemical anomalies in the study area.