摘要
采用顺序提取技术对6个伊犁盆地含铀砂岩样品中锶同位素比值分布进行了研究,依次采用去离子水,0.5 mol/L乙酸溶液,0.5 mol/L盐酸溶液,浓硝酸+氢氟酸混合溶液提取样品中的锶元素,用热电离质谱法(TIMS)测量锶同位素比值。结果表明:不同提取态的锶同位素比值存在明显差异,浓硝酸+氢氟酸提取态87Sr/86Sr远高于盐酸、乙酸、水提取态。乙酸溶解阶段主要溶解样品中碳酸盐,87Sr/86Sr分布范围为0.70989~0.71150,高于同时期海水的87Sr/86Sr(0.7077~0.7083),与河湖水(0.7119)相近,佐证了前人关于伊犁盆地整体上为冲积扇快速入湖的扇三角洲沉积模式的认识。
In this paper,six uranium￣bearing sandstone samples from Yili basin were tested with sequential extraction technique to study the distribution of Sr isotope ratios.Sr was extracted with deionized water,0.5 mol/L acetate,0.5 mol/L hydrochloric acid,concentrated nitric acid and hydrofluoric acid respectively and87 Sr/86 Sr were measured by thermal ionization mass spectrometry(TIMS).The results showed that87 Sr/86 Sr was not consistent in different extraction states.The87 Sr/86 Sr in the extraction state of concentrated nitric acid and hydrofluoric acid were much higher than the87 Sr/86 Sr in the extraction state of hydrochloric acid,acetic acid and deionized water.Acetic acid extraction stage mainly dissolved carbonate minerals.The87 Sr/86 Sr in the extraction state of acetic acid ranged from 0.70989 to 0.71150,higher than that of sea water in same period(0.7077 to 0.7083),but similar to the87 Sr/86 Sr of lake water(0.7119).It is showed that the deposition process was affected by the terrestrial fluid,which is consistent with the previous studies reporting that sandstone in Yili basin was sedimented in the fan delta caused by the alluvial fan quickly into the lake.
作者
颜妍
曾远
刘春红
王莹
张赛楠
YAN Yan;ZENG Yuan;LIU Chunhong;WANG Ying;ZHANG Sainan(Beijing Research Institute of Uranium Geology,Beijing 100029,China)
出处
《铀矿地质》
CAS
CSCD
2020年第4期311-317,共7页
Uranium Geology
关键词
含铀砂岩
锶同位素
顺序提取
矿物组成
uranium-bearing sandstones
87Sr/86Sr
sequential extraction technique
mineral composition
