甘肃红石泉伟晶状白岗岩岩相学和岩石地球化学
发布时间:2019-06-24 20:54
【摘要】:伟晶状白岗岩是红石泉铀矿床的含矿主岩,主要由钾长石、石英以及斜长石、黑云母、白云母组成,副矿物为黄铁矿和锆石。具有富硅(w(SiO_2)平均72.36%)、高碱(w(Na_2O+K_2O)平均8.75%),相对富钾贫钠(w(K_2O/Na_2O)平均2.67),低铁(w(TFe_2O_3)平均2.75%)、镁(w(MgO)平均0.70%)、钙(w(CaO)平均0.74%),弱过铝的特点,属于弱过铝高钾钙碱性系列岩石,具有S型花岗岩特征。微量元素Rb、Th、U、La、Ce、Nd、Zr、Hf等元素相对富集,Ba、Sr、Ti、P等元素相对亏损,具有明显的U、Th富集,Eu负异常。轻稀土元素相对富集,较重稀土元素分馏明显,球粒陨石标准化分布型式图总体略显右倾。结合该区的构造-岩浆演化特点,认为伟晶状白岗岩形成于中高温低压的后碰撞构造环境。
[Abstract]:Pegmatite is the main ore-bearing rock of Hongshiquan uranium deposit, which is mainly composed of potassium feldspar, quartz, plagioclase, biomica and Muscovite, and the accessory minerals are pyrite and zircon. It has the characteristics of silicon-rich (w (SiO_2 (72.36%), high alkali (w (Na_2O K 鈮,
本文编号:2505360
[Abstract]:Pegmatite is the main ore-bearing rock of Hongshiquan uranium deposit, which is mainly composed of potassium feldspar, quartz, plagioclase, biomica and Muscovite, and the accessory minerals are pyrite and zircon. It has the characteristics of silicon-rich (w (SiO_2 (72.36%), high alkali (w (Na_2O K 鈮,
本文编号:2505360
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