Determination of formation age(0.14 Ma)of the Pengyang sandstone-type uranium deposit in the Ordos Basin,China:Using pitchblende in situ femtosecond LA-MC-ICP-MS method

摘要

1.Objective Because of the characteristics of multistage mineralization,long duration,relatively new age,and complicated occurrence of ore minerals,dating of sandstone-type uranium deposits has been a challenging problem.For a long time,the whole-rock U-Pb isochronal method has been used in the dating of sandstone-type uranium deposits,but its accuracy has been questioned by experts.