【摘要】 相山铀矿田北部的721-2和721-18两铀矿床相距1.5 km。两矿床的矿体主要赋存在花岗斑岩及其与围岩的接触带中。燕山期的这两个花岗斑岩小岩体都是基底震旦系浅变质岩通过重溶作用形成的。这两个同源的小岩体是沿基底断裂的交切部位上浸的。当花岗斑岩中发育有与基底高角度重合贯通的构造裂隙时,通过强烈的钠交代作用就在其中发育赋存铀矿体。更多还原

【Abstract】 The two uranium mineral-deposits of 721-2 and 721-18 in northern part of Xianshan uranium mineral deposits are 1.5 km far from each other. The mineral-bodies of the two mineral deposits are mainly existed in the contacting zone of granite-porphyry and adjoining rock. The two small rock-masses of granite-porphyries formed in Yanshan period are formed through anatexis of base shallow metamorphic-rock of Sinian System. The two small rock-masses of the same source intrude upward along the intersection parts of base fissure when the granite-porphyry develope structure coincided and threaded together with the base high angle, endowed uranium ore-bodies develope in it through strong sodium metasomatism.更多还原