通过加速器质谱 C 法测年和不平衡铀系热电离质谱(TIMS)法测年结果的对比, 结合已发表的 1414C 法测年结果和对应的日历年代, 研究了特定的洞穴次生碳酸盐沉积中“死碳”混入比例及其对 C ...通过加速器质谱 C 法测年和不平衡铀系热电离质谱(TIMS)法测年结果的对比, 结合已发表的 1414C 法测年结果和对应的日历年代, 研究了特定的洞穴次生碳酸盐沉积中“死碳”混入比例及其对 C 14法测年的影响. 结果表明, 洞穴次生碳酸盐中“死碳”混入比例变化较大; “死碳”混入比例的不确定使得洞穴次生碳酸盐的 C 法测年结果具有较大的误差. 在对经过老灰岩地层形成的洞穴石笋样品进行 C 14 14或 AMS14C 法定年时, 要充分考虑“死碳”对年龄可靠性的影响.展开更多
We compared two different ways of adding spikes in the chemical procedure of Re-Os age determination. One is that fusing The sample with NigH and N4O2 in the black lead crucible and the spikes of 185Re and 1900s were ...We compared two different ways of adding spikes in the chemical procedure of Re-Os age determination. One is that fusing The sample with NigH and N4O2 in the black lead crucible and the spikes of 185Re and 1900s were fused simultaneously with the sample. the oTher is that the sample was fused in the oxide of alumina crucible,eluted with hot water and Then The spikes were added to the solution directly raTher than being fused. The results from both procedures are the same but the cost of the latter is lower.展开更多
文摘We compared two different ways of adding spikes in the chemical procedure of Re-Os age determination. One is that fusing The sample with NigH and N4O2 in the black lead crucible and the spikes of 185Re and 1900s were fused simultaneously with the sample. the oTher is that the sample was fused in the oxide of alumina crucible,eluted with hot water and Then The spikes were added to the solution directly raTher than being fused. The results from both procedures are the same but the cost of the latter is lower.
