江西相山矿田"充填+交代"铀成矿热液演化过程OA北大核心
The uranium mineralization hydrothermal evolution process of"filling to metasomatism"in Xiangshan ore field,Jiangxi Province
江西相山矿田是我国具有代表性的热液型铀矿田.刻画相山矿田铀成矿热液过程,探讨形成机理,对促进热液矿床成矿理论创新和突破,推动矿床学发展,具有重要意义,但是,由于缺乏对成矿期次和成矿动力学机制的深刻认识,相山矿田成矿热液演化过程一直是研究的薄弱环节.本文通过对已有矿石分析数据再开发、野外和镜下现象重新观察,以水力压裂铀成矿作用为主线,对相山矿田热液演化过程进行了探讨.研究表明,相山矿田主要热液铀矿脉由充填型矿化和交代型矿化组成.充填型矿化品位高,规模较小,K2O含量为0.88％～7.03％(平均4.03％),Na2O含量为0.12％～1.09％(平均0.35％),伴生组分复杂,磷灰石颗粒细小,成矿速度较快;交代型矿化品位较低,分布广泛,K2O含量为0.09％～4.50％(平均1.15％),Na2O含量为1.91％～10.01％(平均6.07％),伴生组分少,磷灰石结晶良好,成矿速度缓慢.铀成矿从充填型矿化开始,交代型矿化结束,铀成矿温度变化不大,成矿压力和氧化还原电位逐渐升高,成矿热液向碱度升高方向演化.
Xiangshan ore field in Jiangxi Province is a representative hydrothermal uranium ore field in China.De-scribing the evolution of uranium metallogenic hydrothermal fluid in Xiangshan ore field and exploring its formation mechanism is of great significance for promoting innovation and breakthroughs in the theory of hydrothermal ore de-posit mineralization,and advancing the development of ore deposit studies.However,due to the lack of deep under-standing of the mineralization stage and mineralization dynamics mechanism,the evolution of uranium metallogenic hydrothermal fluid in Xiangshan ore field has been a weak link in the study.This paper discusses the hydrothermal process from filling mineralization to metasomatism mineralization in Xiangshan ore field by redeveloping existing ore analysis data and re-observing the macro and micro phenomena,with hydraulic fracturing uranium mineralization as the main focus.The study shows that the main hydrothermal uranium veins in Xiangshan ore field are composed of filling type mineralization and metasomatism type mineralization.Filling type mineralization has high grade and small scale,with K2O content of 0.88％～7.03％(average 4.03％)and Na2O content of 0.12％～1.09％(average 0.35％),complex associated components,small apatite particles,and fast mineralization rate.Metamorphic type mineralization is low grade and widely distributed,with K2O content of 0.09％～4.50％(average 1.15％),Na2O content of 1.91％～10.01％(average 6.07％),few associated components,good crystallization of apatite,and slow mineralization rate.Uranium mineralization begins with filling type mineralization and ends with metasomatism type min-eralization.The temperature of uranium mineralization does not change much,and the ore-forming pressure and redox potential show a gradual increase process.The ore-forming hydrothermal fluid evolves towards an increase in alkalinity.
张万良;郭福生;魏欣;李余亮
核工业二七○研究所,中国地质学会华东放射性矿产勘查技术创新基地,江西南昌 330200东华理工大学,江西南昌 330013核工业二七○研究所,中国地质学会华东放射性矿产勘查技术创新基地,江西南昌 330200核工业二七○研究所,中国地质学会华东放射性矿产勘查技术创新基地,江西南昌 330200
天文与地球科学
充填型铀矿化交代型铀矿化形成时序演化过程相山铀矿田
filling type uranium mineralizationmetasomatism type mineralizationformation of time sequenceevolution processXiangshan uranium ore field
《岩石矿物学杂志》 2025 (4)
855-869,15
国家自然科学基金项目(42472130)中国核工业地质局地勘费项目(2022-29)江西省技术创新引导类计划(20212AEI91008) National Natural Science Foundation of China(42472130)China Nuclear Geology Bureau Geolog-ical Exploration Fund Project(2022-29)Jiangxi Province Technological Innovation Guidance Program(20212AEI91008)
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