海相化学碳酸盐沉积中的铅同位素测定

Pb Isotope Determination on Marine Carbonate in Chemical Sediment

铅同位素在沉积学和古海洋地质研究中具有广阔的应用前景 ,然而由于碳酸盐的含铅量甚微 ,给铅的化学分离、富集和同位素质谱分析带来困难 ,制约了这一领域的发展。本实验经过反复、深入探索 ,合理地制定了碳酸盐铅同位素样品制备的实验流程。通过对 2 2件灰岩、白云岩样品的铅同位素组成的系统测定 ,表明该实验流程稳定可靠。

Pb isotope has wide application in sediments and ancient ocean research. Chemical separation and enrichment on lead and isotopic analyse are difficult because of minor lead in carbonate. It restricts development about Pb isotope application in this field. The author reasonably sets down experimental flow to obtain carbonate Pb isotope.The experimental results were believed to be credible after repeated Pb isotopic determination on more than twenty calcite and dolomite sample.