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花岗岩型碳酸钠质交代热液铀矿床蚀变带中的重矿物有明显的改造与叠加现象。随着矿物的解离,热液从围岩中获取了部分矿源。主要铀矿化是在热液连续活动的晚期,铀与金属硫化物共沉淀。本文就西北某花岗岩体在碳酸钠质热液作用下所发生的重矿物组合含量及主要重矿物性质的一系列变化,以及与此有关的铀的活化转移与沉淀阶段等问题进行讨论。
The heavy minerals in the alteration zone of granite-type carbonate sodium metasomatic hydrothermal uranium deposit have been obviously remodeled and superimposed. With the dissociation of minerals, hydrothermal fluids obtained some of the ore from the surrounding rock. The main uranium mineralization is the late stage of hydrothermal continuous activity, uranium and metal sulfide co-precipitation. In this paper, a series of changes of the heavy mineral assemblages and the main heavy mineral properties of a granite body in northwest China under the action of sodium carbonate pyrolytic fluid, as well as the related uranium activation and sedimentation stage are discussed.