Teh Ta'ergou tungsten deposit in the Gansu Province, northwestern China is located in Western part of the North Qilian Caledonian orogen. It comprises skarn and wolframite quartz vein types of ores. The tungsten-bearing skarn developed by teh replacement of carbonate layers intercalated in the Precambrian schist and amphibolite whereas wolframite- quartz ore veins develoepd along a group of fractures which cut through horizontal skarns. The Ta'ergou tungsten deposit is genetically related to the Yeniutan Caledonian granodiorite intrusion. However, the graitoid is characterized by a low differentiation and a low content of SiO_2 and high contents of basic components. Due to a high abundance of tungsten in the Precambrian metamorphic rocks and a low abundance in granitoids, it is proposed that the tungsten of the deposit was mainly derived form the Precambrian strata rather than from granitoids. The latter acted as a source of heat during the mineralization process.
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