松辽盆地砂岩型铀矿铀含量配分比例的半定量分析  

Semi-Quantitative Analysis of Uranium Content Distribution Ratio in a Sandstone-Type Uranium Deposit in Songliao Basin

作　　者：刘明义 吴柏林[1] 杨松林[3] 郝欣[1] 王苗 李琪 林周洋 张效瑞 LIU Mingyi;WU Bailin;YANG Songlin;HAO Xin;WANG Miao;LI Qi;LIN Zhouyang;ZHANG Xiaorui(State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi’an 710069,China;Xi’an Center,China Geological Survey,Xi’an 710119,China;The Exploration and Development Research Institute of Liaohe Oilfield Branch Company,PetroChina,Panjin 124201,China)

机构地区：[1]大陆动力学国家重点实验室,西北大学地质学系,陕西西安710069 [2]中国地质调查局西安地质调查中心,陕西西安710119 [3]中国石油辽河油田分公司勘探开发研究院,辽宁盘锦124010

出　　处：《岩矿测试》2024年第2期224-233,共10页Rock and Mineral Analysis

基　　金：国家重点研发计划项目(2023YFC2906702,2021YFE0190500,2021YFC2901802);中国地质调查局地质调查项目(DD20230582);中核铀业“揭榜挂帅”科技攻关项目(202302)。

摘　　要：钱家店铀矿是位于松辽盆地南部的复成因砂岩型铀矿,受表生淋滤、辉绿岩中低温热液和深部油气等多流体影响,目前铀矿物赋存状态尚有一定争议,铀在矿石内不同矿物中的配分尚不明确。为了进一步明确铀赋存状态和在不同矿物中的配分,计算钱家店矿石中不同矿物中铀的配分比例,本文运用岩矿鉴定、铀化学逐级提取、电子探针和激光剥蚀电感耦合等离子体质谱(LA-ICP-MS)微区原位分析技术开展综合测试分析。明确了钱家店铀矿物的赋存状态,认为钱家店铀矿物以吸附态为主,约占总铀含量的80%,结合态铀矿物或含铀矿物约占比20%。其中吸附态铀矿物主要富集在方解石等碳酸盐矿物中,占总铀含量的47.86%,其次是在黏土矿物中占17.94%,在铁锰氧化物矿物中占12.21%。独立铀矿物是与黄铁矿密切共生的沥青铀矿为主,约占铀总含量的9.07%,另有少量含钛铀矿物和铀石约占5.08%。这种矿石中各碎屑组分中铀的占比量化研究,为矿床地浸开采及资源量计算提供依据。The Qianjiadian uranium deposit is a complex-metamorphic sandstone-type uranium mine located in the southern part of the Songliao Basin.To determine the state of uranium mineralization and its partitioning in different minerals,petrographic identification,uranium chemical step-by-step extraction,electron probe microanalysis and laser ablation inductively coupled plasma-mass spectrometry(LA-ICP-MS)were used.The results show that Qianjiadian uranium minerals are predominantly in adsorbed state,accounting for about 80%of the total uranium content,of which 47.86%is in carbonate minerals,such as calcite,17.94%in clay minerals,and 12.21%in iron and manganese oxides minerals.Combined or uranium-bearing minerals account for approximately 20%of the total uranium content,of which stand-alone uranium minerals are dominated by pitchblende uranium ore,which accounts for approximately 9.07%of the total uranium content,and a small amount of titanium-bearing uranium minerals and uraninite,which accounts for approximately 5.08%.

关 键 词：铀赋存状态 原位 电子探针 激光剥蚀电感耦合等离子体质谱法 配分比例 钱家店铀矿 松辽盆地 

分 类 号：P619.14[天文地球—矿床学] O657.63[天文地球—地质学]