Abstract:

Controlled by the NNW-trending Keziletao-Kusilapu fault, the Tamu-Kalangu lead-zinc metallogenic belt is distributed roughly along the large fault at southwestern margin of the Tarim plate. At present, more than twenty deposits or mineralized spots have been found in the belt. Based on the systematical p-T measurements and simulating calculation for the fluid inclusions from four typical deposits, i.e., Tiekelike, Tamu, Apalieke and Kalangu, together with the available data, the following conclusions can be drawn: these lead-zinc deposits in the Tamu-Kalangu metallogenic belt belong to Mississippi-valley-type (MVT). The mineralizing pressures of the four deposits are 45-65 MPa, 33-45 MPa, 36-54 MPa and 33-45 MPa respectively and have corresponding metallogenic depths of 5.85 km, 4.24 km, 4.94 km and 4.34 km, indicating their hypabyssal nature. Furthermore, the ore-forming fluids for these lead-zinc deposits are polygene rather than monophyletic.

Key words: Tamu-Kalangu lead-zinc metallogenic belt, fluid inclusions, metallogenetic depth, sources of ore-forming fluid