水辐射分解促进铀矿床围岩赤铁矿化蚀变的实验研究

EXPERIMENTAL STUDIES IN RADIOLYSIS OF WATER FACILITATING HEMATITIZATION OF HOSTROCKS IN URANIUM DEPOSITS

本文根据人工辐照含二价铁的水溶液实验结果,讨论水的辐射分解对铀矿床围岩红化蚀变的意义。铀矿床围岩中各种形式的水,当遭受辐射线长期辐照后,将发生辐射分解作用,析出许多自由基及其反应产物(H,H_3O^+,OH,HO_2,H_2,O_2,H_2O_2等),其最终结果是明显地增强周围介质的氧化性,这无论在氧化或弱还原条件下,都将使铀矿床围岩中广泛分布的二价铁氧化成三价铁,产生红化(赤铁矿化)围岩蚀变,利用这一原理可解释某些地质现象。

The gamma irradiation experiments were performed. Water solution containing Fe_2SO_3,Na_2SO_3 was placed in a gamma field, having absorbed dose of 0,20, 60, 180, 500 KGy (during5d). The water solution in gamma field was disintegrated into hydrogen, oxygen and oxidi-zing compounds (e.g., H_2O_2) under the influence of ionizing radiation, called radiolysis.It was of particular concern because it produced an oxidizing environment and changed Fe^2+into Fe^(3+). The reaction culd happen in host rocks of uranium deposit and result in the for-mation of hematite, goethite etc,reddening host-rocks. Authors of this paper explain severalgeological phenomena with radiolysis, and suggest that radiolysis of water is an importantcause for hematitization of hostrocks in uranium deposits.