藏东“三江”地区热液型铀矿成矿条件与找矿方向

The Metallogenic Condition and Prospecting Direction of Hydrothermal Uranium Deposit in Sanjiang Area of Eastern Tibet

文章从大地构造背景与基底成熟度、铀源条件、地层与岩性、岩体成因类型、岩体期次与空间配置、火山岩特征、控矿构造、围岩蚀变等方面对藏东"三江"地区热液型铀矿的成矿条件进行了分析,指出藏东"三江"地区存在形成热液型铀矿的基本地质条件,但总体成矿条件不是十分优越。在找矿方向上,应以寻找花岗岩内、外接触带型铀矿为主攻目标类型。

This paper makes a systematic analysis of the metallogenic condition of hydrothermal type uranium deposit in Sanjiang area of Eeastern Tibet in the following perspects： geotectonic background, basement maturity, uranium source conditions, strata and lithology, genetic types of magmatic rock, forming time and space configuration of magmatic rocks, volcanic rock characteristics, ore-controlling structure and the wall-rock alteration etc. We explicitly point out that Sanjiang area bears the basic geological condition to form hydrothermal type uranium deposits, but the metallogenic conditions are not superior on the whole. The main targets should be the granite type deposit in the internal and external contact zone between pluton and the strata.