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Okélobondo晶质铀矿块状矿体位于Oklo地区深部约300m处。取自钻孔较浅深度(100～200m)地下水样品的pH值为中性至碱性,具还原性质,其中晶质铀矿呈饱和状态。相反,取自矿体附近深部的水样为偏碱性的氧化性质,晶质铀矿处于溶解的不饱和状态。深部的这种氧化条件是很独特的,由于它影响着在贮藏条件下的铀氧化物的化学稳定性,其来源和成因是值得研究的。本文通过三种一维柱的模拟水流及对其化学反应作了分析,并探讨了造成这种情况的可能性。
The Okélobondo crystalline uranium massive orebodies are located about 300m deep in the Oklo area. The groundwater samples taken from the shallow depth (100 ~ 200m) of the boreholes have the pH value of neutral to alkaline with a reducing property, in which the crystalline uranium deposits are saturated. In contrast, the water samples taken from the deeper part of the orebody are slightly alkaline oxidized and the crystalline uranium is dissolved and unsaturated. This deep oxidizing condition is unique and its origin and causes deserve to be studied since it affects the chemical stability of uranium oxide under storage conditions. In this paper, we simulate water flow through three kinds of one-dimensional columns and analyze their chemical reactions, and discuss the possibility of causing this situation.