摘要
黄花沟铀矿点是核工业二一六大队近年来在准噶尔盆地北部新发现的地表铀矿点。与传统层间氧化带型砂岩型铀矿不同,黄花沟铀矿点的铀矿体具有固结程度高、呈透镜状或板状、顺层、断续分布的特点。文章对地表铀矿石样品开展了详细的地球化学和矿物学研究,并对其矿化成因进行了探讨。主微量元素分析结果显示,铀矿化砂岩具有高的磷和钙含量,且铀与磷、钙呈明显的正相关。显微镜下观察发现,矿化砂岩中发育大量微晶磷灰石,以胶结物形式交代早期长石石英砂岩,且未见独立铀矿物。矿物成分分析结果显示,磷灰石中含有较高的铀含量(平均为0.17%),结合全岩的磷、钙含量,估算出矿化砂岩中的铀基本全部由磷灰石提供。综合矿化砂岩的地质产出特征、矿化蚀变特征,认为黄花沟地表铀矿化为一种新的铀矿化类型,可能是晚期富磷富铀流体交代早期钙质砂岩的产物。
Huanghuagou uranium occurrence was discovered by the Geologic Party No.216 CNNC in recent year in the north of Junggar Basin.The uranium ore body in Huanghuagou is characterized by high degree of consolidation,lenticular or tabular in shape,bedding and intermittent distribution,which is different from the typical interlayer oxidation sandstone type uranium deposit.In this paper,detailed geochemical and mineralogical studies were conducted to analyze the mineralization genesis.Major and trace elements study results showed that the uranium mineralized sandstone has high contents of phosphorus and calcium,and positively correlated to the content of uranium.Petrological observation of thin sections showed that a large amount of tiny apatite was developed in ores,which replaced the early feldspar quartz sandstone in the form of cement.No independent uranium mineral was observed under the electron microscope.Mineral composition analysis showed that the apatite has high uranium content(0.17%on average).Combined with the phosphorus and calcium content of the whole rock,it is estimated that the uranium in the mineralized sandstone was basically supplied by apatite.Based on the features of geological occurrence and mineralized alteration of uranium ores,it was considered that the uranium mineralization in Huanghuagou is a new type of sandstone uranium mineralization.The uranium ore bodies may be the metasomatic product of the early calcareous sandstone reacted with the late phosphorus and uranium enriched fluid.
作者
朱斌
吴玉
钟军
陈虹
东前
毛广振
ZHU Bin;WU Yu;ZHONG Jun;CHEN Hong;DONG Qian;MAO Guangzhen(CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Techniques,Beijing Research Institute of Uranium Geology,Beijing 100029,China;Geologic Party No.216,CNNC,Urumqi,Xinjiang 830011,China)
出处
《铀矿地质》
CAS
CSCD
2023年第6期1037-1051,共15页
Uranium Geology
基金
中核集团集中研发项目(编号:中核科发2021-143号)
中核集团青年英才“菁英”项目(编号:地QNYC2201)联合资助
核材料创新基金项目(编号:ICNM-2022-ZH-07)
铀矿地质勘查项目(编号:2022006006)。
关键词
砂岩型铀矿
磷灰石
矿化成因
准噶尔盆地
黄花沟地区
sandstone-type uranium mineralization
apatite
mineralization origin
Junggar Basin
Huanghuagou area
