广西北部摩天岭地区铀成矿特征浅析

摩天岭地区铀成矿与岩体风化剥蚀、大气降水、储矿构造闭合性及特定的还原环境密切相关;岩体表层风化剥蚀物和变质岩残留体为铀成矿提供铀源,表层浸取作用使铀从铀源体中浸出,并随大气降水沿构造进入地下,硅质热液活动将成矿流体加热并上升到近地表成矿.从铀源、水源、热源、储矿构造及还原环境等方面对其成矿特征进行了简单叙述,并建立了铀成矿模式.

Brief analysis of uranium metallogenic features in Motianling area,northern Guangxi

In Motianling area,uranium metallogenesis are intimately related to weathering and denudation of the granite,atmospheric precipitation,closing degree of the ore storing structure,and the specific reducing environment.The denuded substances of the granite surface and the metamorphic residue body provide the uranium sources for uranium ore-forming.As a result of surfacial leaching,uranium is leached by meteoric water,and entered deep earth with precipitation along the fractures.Ore-forming fluids are heated and raised to the near surface for mineralization owing to siliceous hydrothermal activity.Uranium metallogenic features in Motianling area are briefly described in the aspects of uranium sources,water sources,heat sources,ore-storing structure and reducing environment etc.,and uranium metallogenic model is established in the paper.