藏东“三江”地区热液型铀矿成矿条件与找矿方向

摘要

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.%Located in the north of Xiangshan orefield, Baquan uranium deposit is a typical cryptoexplosion breccia related deposit. The cryptoexplosion breccia pipe was closely related to the granite porphyry rock sticks which penetrated into the Sinian metamorphic strata in Late Yanshanian. It's a comprehensive geological body of igneous rock, breccia bodies and ores which is the product of a continuous geological process affected by multi-stage magmatic activity, and hidden explosion. The intrusion of granite porphyry and dacite porphyry in Late Yanshanian, and the formation of crypto explosion breccia and the faults structure are very important to the uranium deposits. The pulesating and hidden cryptoexplosion resultet in the variety of rocks and mineralization alteration. Uranium ore body mainly occurred in cryptoexplosion and shattered breccia and the mineralization is rich in the centre and upper but poor in the edge and bottom of the pipe.