The Physicochemical Environment and Uplift-Cooling History of Yeniutan Granodiorite, Subei County, Gansu Province

With the application of X-ray diffraction and stable isotope, this paper concludes that Yeniutan granodiorite was formed at a temperature no more than 600℃ and a depth about 4 km-5 km underground, which is near the bottom of earth's upper crust. During the formation, the exchange between magmatic water and atmospheric precipitation is insufficient, and the oxygen fugacity is low. Inclusion composition indicates that the magmatic water is negative to the mineralization. A variety of the dating data on Yeniutan granodiorite confirm that the rock mass was formed in late Ordovician. After the formation, the uplift of Yeniutan region is not so high, thus the denunciation of the nearby Ta'ergou tungsten deposit is not deep.