Abstract:

The Kalamaili gold belt is located at the north margin of the Junggar Basin and includes the area to the south of ArmantaiBeitashan. As an important gold and polymetallic ore belt in Xinjiang, it belongs to the KalamailiMoqinwula mineralization belt (IVgrade metallogenic belt) of the KalamailiDaerbute gold metallogenic belt (IIIgrade metallogenic belt). The study of fluid inclusions of the Shuangquan, Nanmingshui, Sujiquan and other gold deposits in the Kalamaili belt indicates that the oreforming fluid during the major stage of mineralization was a COHNS system, with medium to low temperature (200230 ℃) and low salinity (3.55%4.5%). The study of hydrogen and oxygen isotopes suggests that the oreforming fluid of the Kubusu gold deposit was mainly derived from magmatic water, while metamorphic water dominated in the other gold deposits of the belt. Sulfur isotopic geochemistry indicates that the sulfur in the Shuangquan and Nanmingshui gold deposits was mainly from metamorphic wall rock, though partial sulfur may have been contributed by magma. In the Jinshangou and Liushuquan gold deposits, the sulfur was mainly derived from magma and the mineralization may have been associated with volcanic to subvolcanic activity.

Key words:  fluid inclusions, hydrogen, oxygen and sulfur isotopes, oreforming fluids, Kalamaili gold belt, Xinjiang