相山李家?guī)X鈾礦床熱液蝕變作用地球化學特征
[Abstract]:Lijialing uranium deposit is a uranium deposit discovered in the west of Xiangshan in recent years. The hydrothermal alteration of the deposit is particularly developed and there are obvious altered zonation phenomena. On the basis of detailed field and laboratory petrographic observation of the core samples of the borehole, the uranium mineralization section of the Lijialing uranium deposit is divided into the central mineralization zone and the alteration zone beside the ore deposit. The hydrothermal alteration intensity of the near ore alteration zone and the distant ore alteration zone decreases in turn. The standardized Isocon diagram method shows that the CaO,FeO,Fe_2O_3,Na_2O increases obviously in the hydrothermal alteration zone, which is consistent with the development of hematitization, albite and carbonization. The decrease of K-2O is due to the migration of K from albite to potassium feldspar. However, MnO,MgO has the characteristics of "rising and falling" in each alteration zone, indicating that the hydrothermal alteration and metasomatism process is not simply diffusion percolation, and there may be a convective equilibrium element migration mode. Th,Y,Zr, The change of trace elements, such as Hf, is consistent with the uranium content, which is a good indicator of uranium mineralization. HREE is closely related to uranium mineralization. With the increase of alteration degree, HREE increases obviously, indicating that the ore-forming fluid is rich in HREE, and has deep source.
【作者單位】: 東華理工大學地球科學學院;中國地質大學(武漢)資源學院;
【基金】:國家自然科學基金項目(U1403292)
【分類號】:P619.14
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