A Quantitative Discussion on Element Mass Migration in the Wunugetushan Porphyry Cu-Mo Deposit, Inner Mongolia
内蒙古乌努格吐山斑岩型铜钼矿床元素迁移定量探讨

Element enrichment and depletion constitute the inherent objective regularity in the ore deposits. Previous studies mainly concentrated on discussions from the qualitative angle, whereas quantitative researches were insufficient. This paper made a tentative quantitative discussion on characteristics of the gains and losses of ele-ments during their migration, through calculation based on the formula given by Grant, with the Wunugetushan porphyry ore deposit as an example. The results demonstrate that mass migration of different elements show certain regularity within the range of mineralized alteration. Compared with least-altered rocks, altered rocks are obviously enriched in Cu, Mo, Au, Ag, W, Sn, As, F, Hg, S and depleted in CaO, Na2O, TiO2, Zr, Ba, Sr, Rb and REE. The gains and losses of elements caused the element enrichment and depletion of the ore deposit and altered wall rock. The calculation thinking and method for element mass migration provide an available approach to geochemical exploration in the quantitative direction.