甘肃野牛滩岩体形成的物理化学环境及隆起-冷却史
The Physicochemical Environment and Uplift-Cooling History of Yeniutan Granodiorite, Subei County, Gansu Province
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摘要: 利用X光衍射、稳定同位素等多种手段研究,认为野牛滩岩体形成温度不高于600℃,岩体形成深度为4~5 km,相当于大陆地壳上部壳层的下部。岩体形成时岩浆水与大气降水交换不充分,而且处于较低氧逸度环境。矿物包裹体成分说明岩浆水对成矿不利。多种测年资料证实野牛滩岩体形成于奥陶纪末,岩体形成后野牛滩地区隆起不高,因此其近侧的塔尔沟钨矿剥蚀不深。Abstract: 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.
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Key words:
- Yeniutan granodiorite /
- physicochemical environment /
- uplift-cooling /
- Gansu province
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