铼-锇同位素测年法研究综述

Re-Os同位素测年的最合适的对象为辉钼矿,定年是基于放射性的187Re通过β衰变成为187Os而引起锇同位素异常来计算地质年代的。在目前的测试研究中,较常用的方案为Carius管溶样法-蒸馏分离Os-萃取分离Re-TJA PQ ExCell ICPMS测定同位素比值。在我国有许多成功用Re-Os同位素测定钼矿床成矿年龄的范例,对认识矿床特征及成因、总结区域的成矿演化规律、解决相关地质问题具有重要的理论意义,而且对于指导矿床的预测和勘查具有很高科学价值。

Research review of Re-Os isotopic system dating method

The most suitable target is molybdenite for Re-Os isotopic dating system.The method is based on ^187Re β-decay to ^187Os,causing Os stable isotope abnormity to calculate the geological age.In the current study,the commonly used program is the Carius tube digestion-separating Os by distillation-separating Re by extraction-testing the isotope ratio by TJA PQ ExCell ICPMS.The new thermal ionization mass spectrometer（TIMS,IsoProbe-T） is with high sensitivity and high precision characteristics.There are many successful examples of dating Mo deposit, using Re-Os isotopic system. The determination of the ore-form- ing is of great significance both in theory and in practice, which is helpful to the understanding of the character and origin of an ore deposit and summing up the formation and evolution disciplinarian of the regional ore deposits and solving the related geological problems. It is also with great scientific value to guide the deposit forecast and exploration.