伊犁盆地南缘郎卡地区砂岩型铀矿铀的赋存形式研究  

Study on Occurrence Forms of Uranium in Sandstone-type Uranium Deposits in Langka Area,South Margin of Yili Basin

作　　者：张虎军[1] 王博 ZHANG Hujun;WANG Bo(Geologic Party No.216,CNNC,Urumqi,Xinjiang 830011,China)

机构地区：[1]核工业二一六大队,新疆乌鲁木齐830011

出　　处：《铀矿地质》2025年第2期228-243,共16页Uranium Geology

基　　金：中国核工业地质局项目“新疆伊犁盆地及周边地区砂岩型铀矿资源调查评价与勘查”(编号:202205);国家自然科学基金项目(编号:42272097)联合资助。

摘　　要：近几年郎卡地区陆续发现一些高品位铀矿化孔,但是前人对于该地区铀矿石中铀的赋存形式未做深入研究。本次研究通过α蚀刻径迹、显微观察分析、电子探针(EPMA)和扫描电镜(SEM)等方法手段对该地区铀矿石开展矿物学分析。研究发现该地区铀矿石中的铀主要以独立铀矿物、含铀混合物和吸附态形式分布,独立铀矿物主要分布在石英、长石的碎屑颗粒边缘和黄铁矿的周围,含铀混合物主要是铀分布在TiO_(2)矿物颗粒的表面,吸附态铀主要分布在高岭石周围。根据富集机制和空间关系,共有5组铀矿物组合类型,其中黄铁矿型和少量的炭屑型铀矿物组合形成于主成矿阶段,铀矿物-含钛矿物型形成于稍晚于黄铁矿型的主成矿阶段,方解石型铀矿物组合形成于成矿晚期,高岭石吸附型形成于整个成矿阶段。本次研究为郎卡地区的铀矿成矿理论和铀矿采选冶等提供了基础支持。In recent years,some high-grade uranium mineralization holes have been discovered in Langka area,but the occurrence forms of uranium in uranium ore was studied in detail by the predecessors.In this study,mineralogical analysis of uranium ore in this area was carried out by means ofα-etching track,microscopic observation analysis,electron probe(EPMA)and scanning electron microscope(SEM).It was found that uranium in the ore mainly distributed in the form of independent uranium mineral,uranium containing mixture and adsorbed state.The independent uranium mineral is mainly distributed in the edge of quartz and feldspar detrital particles and around pyrite;uranium containing mixture is mainly distributed on the surface of TiO_(2) mineral particles,and adsorbed uranium is mainly distributed around kaolinite.According to the enrichment mechanism and spatial relationship,the uranium mineral assemblage were divided into 5 types,among which pyrite type and a small amount of char type uranium mineral assemblage were formed in the main mineralization stage,uranium mineral-TiO_(2) type was formed in the main mineralization stage slightly later than pyrite type,calcite type uranium mineral assemblage was formed in the late mineralization stage,and kaolinite adsorption type was formed in the entire mineralization stage.This study can provide basic support for the theory of uranium mineralization formation,mining and milling in this area.

关 键 词：郎卡地区 砂岩型铀矿 赋存形式 铀矿物组合 

分 类 号：P619.14[天文地球—矿床学]