摘要
对白岗岩的岩相学、地球化学、成岩年龄、物质来源、成岩条件和岩石演化特征等方面作了系统总结,结果表明:岩石为富硅、富钾、过铝质、钙碱性,贫钙、铁、镁花岗岩,微量元素Cr、Ni、Co等铁族元素和Mo、Zr、Zn等亲硫元素相对富集,轻重稀土的比值<1,稀土分配型式呈平坦状,有明显的铕负异常。研究表明研究区白岗岩为龙首山群地层经重熔作用形成的花岗质岩浆结晶分异的产物;白岗岩与铀矿有明显的共生关系,并且为铀矿形成提供了铀源和热源。
The authors do the system summary on petrography,geochemistry,geochronology,material source,rock-forming conditions and evolution characteristics of alaskite,and the result shows that the pegmatoidal alaskite is silicon-rich,potassium-rich,over aluminum,calcium alkaline,calcium-poor,iron-poor,magnesium-poor granite. Enrichment of Cr,Ni,Co and other iron group elements and Mo,Zr,Zn and other pro-sulfur element in trace elements. The LREE and HREE ratio is less than 1,and the distribution of rare earth elements shows flats shape. There has a significant negative Eu anomalies,which is the product of Longshoushan stratum. Pegmatoidal alaskite and uranium deposits have obvious symbiotic relationship,and provides uranium source and heat for the formation of uranium deposits.
出处
《资源环境与工程》
2017年第1期18-22,共5页
Resources Environment & Engineering
基金
国家自然科学基金项目(项目编号:41172079)资助
关键词
白岗岩
铀成矿
龙首山
alaskite
uranium mineralization
Longshoushan
