Скачать или смотреть Use of geochem data-levelling techniques in prospecting - Prof C Okujeni

04 May 2002 GSSA Lunchtime talk with Prof Charles Okujen

The use of geochemical data-levelling techniques in prospecting transported-regolith dominated terrains - Prof C Okujeni

The presentation is a case study onthe use of geochemical/ statistical data-levelling techniques in enhancing element patterns for exploration terrains covered by aeolian sand and calcrete.

Subsurface and surface regolith samples from two locations were evaluated using a combination of cluster analysis, discriminant projection analysis, and auto domain to classify soil data into regolith units for data levelling. A combination of SiO2, Al2O3, Ti and Zr ratios separated saprolite, calcrete, stone-line and aeolian sand as regolith units in autodomain diagrams andbivariate plots.

Z-score power transform of data (levelling)based on the regolith classification best maximised the geochemical contrast in the two localities considered. Values rescaled to 0 – 1 enhanced the geochemical anomaly under calcrete cover.

The study reinforces the importance and recommends terrain mapping in establishing the spatial distribution of regolith units during soil geochemical sampling. Multi-element data by pXRF and especially the use of immobile element could delineate the spatial distribution patterns of regolith units in exploration terrain.

Prof Charles Okujeni is an emeritus professor of exploration geochemistry at the University of the Western Cape. He obtained MSc and PhD degrees at the Technical University Berlin, Germany in 1976 and 1980 respectively. He has researched and lectured geochemistry at various universities in Africa for over 30 years. Furthermore, he served as the Association Exploration Geochemists (AAG) Regional Councillor for Africa from 1995-2010.