Geochemical Characteristics of Liba Group Gold-Bearing Turbidite Formation in Lixian-Minxian Gold Mineralized Zone, West Qinling, Gansu Province

The distribution of gold, geochemical features of trace elements in the Liba group goldbearing turbidite formation and their relationship with gold metalisation have been studied in detail. The results show that Liba group gold-bearing turbidite formation is rich in An, As,Sb, Bi and Cr, Ni, Co and V, and has high ratios of An/Ag and An/As, but it is depleted in Hg, Sr and Ba. Contents of As, Bi, Ni, Mn, Ti, Cr, V and ratios of Au/Ag, Au/ As and As/Sb gradually increase from D₂Lb¹ to D₂Lb³, on the contrary, contents of Sb, Sb+Bi+Hg and ratios of Co/Ni and Cr/Ni reduce by degrees. R-type cluster analysis of trace elements in Liziyuan group, gold-bearing turbidite formation and Liba ore-bearing faults indicates that they have common elements association which are Ni, Co, Cr and V, and ore-forming elements in the Liba gold mine inherit obviously components in the Liba gold-bearing turbidite formation and Liziyuan group. The Liziyuan group is the primary gold-bearing formation which consists mainly of basic volcanic rocks with high gold abaundance. The Liba group goldbearing turbidite formation is a derivative gold-bearing formation. The Liba group gold-bearing formation is not main gold source rocks, but gold host rocks.