ABSTRACT

A quartz porphyry dyke in the Kamioka Pb-Zn-Mo mining district shows large variations of Na, K, Ba and Sr concentrations with sodium negatively correlating to other three elements. These compositional changes are well explained by a model of liquid percolation through the rock, for which a mathematical formula was described by Haskin (1984). The liquid percolation brought about addition of K, Ba and Sr to the rock by compensating Na. Estimated composition for the liquid has K₂O/Ba = 47 and Sr/Ba = 0.14. It is also indicated that D_Na is in inverse proportion to the concentrations of K, Ba or Sr in the liquid.