| Abstract: | The Grigoryan-Ovchinnikov universal zoning rule in primary halos is frequently violated because of changes due to certain physico-chemical conditions prevailing during the formation of orebodies. Thus, depth changes in the formation of an orebody cause significant variations in the ore element ratios in the primary halos. For example, the As·Sb/Mo·W and As·Sb·B·W/Ag·Pb·Cu·Mo ratios change by 2–3 orders for deposits of different formation depths. To obtain a more definite interpretation of one's vertical position in a deposit the use of the characteristics of metasomatite composition and associated elements (K, Na, Rb, Sr and others) is suggested. A conjugate distribution of Au and sulphides is shown. Gold migration as hydrosulphide complexes are considered possible. |
