Abstract:

Qieliekeqi iron deposit is located in the south belt of West Kunlun orogenic belt. Ore bodies occur as layer, layer-like in Wenquangou Formation. On basis of research on geological characteristics and combining with study of geochemistry and fluid inclusions, we propose that Qieliekeqi deposit mainly formed by hydrothermal exhalative process which formed bedded, lamellar and banded orebodies. The orebodies reformed by magmatic hydrothermal fluids at the later stage, which lead to the formation of veinlet coarse siderite. Homogenization temperature of fluid inclusions in siliceous bands ranges from 140 ℃ to 160 ℃, the salinity is 4.79%-5.09% NaCl eqv. Three types of fluid inclusions are recognized in quartz vein formed in post mineralization stage, which is vapor-liquid type, vapor-rich type and halite-bearing multiphase type.The ore-forming fluids are medium to high temperature with high salinity fluid and low temperature with low salinity fluid.

Key words: West Kunlun, siderite, hydrothermal exhalative, fluid inclusion, geochemistry, Xinjiang