【摘要】 相山铀矿田的变质基底,自晋宁期以来经历了长期而复杂的变质变形演化历史,至中生代为止,共经历了4个期次变质作用的叠加改造:中元古代区域热动力变质作用,中元古代后的热接触变质作用,中生代动力变质作用,中生代晚期的热接触变质作用。多期次变质作用的叠加改造,反映了本区自元古宙以来一直是一处地热异常区。相山地区铀成矿期的成矿作用,是一系列构造-岩浆-变质作用叠加的结果。更多还原

【Abstract】 Metamorphic rocks in the basement of Xiangshan uranium orefield,experienced long-term complex metamorphic-deformational evolution.From Jinning period to later Mesozoic era.It had suffered from four phase of superimposed metamorphism:regional dynamo thermal metamorphism in Mesoproterozoic era,contact-thermal metamorphism after mesoproterozoic era,dynamic metamorphism in Mesozoic era and contact-thermal metamorphism in the later of Mesozoic era.Multi-phase superimposed metamorphism show that Xiangshan area is a geothermally anomalous area ever since Proterozoic Eon.In Xiangshan area,the uranium mineralization are the outcome of superimposition of tectonism-magmatism-metamorphism.更多还原