利用超精细地层取样,结合中子活化分析,仔细研究了丹麦Stevns Klint处两个不同R/K界面粘土层中的铱的丰度变化及其与其它元素的相关性。结果表明,尽管被研究的两个铱异常层相距甚近,但无论是铱的丰度,还是与其它元素的变化关系,都呈现不同的图象。这也许是由于地外物质本身的不均匀性、撞击过程和随后沉降过程的极端不平衡、局部地球化学环境的差异诸因素所致。 The abundance changes of iridium in two different R / K interfacial clay layers at Stevns Klint, Denmark, and their correlations with other elements were carefully studied using ultra-fine strata sampling and neutron activation analysis. The results show that despite the close proximity of the two iridium anomalies studied, both the abundances of iridium and the variation of other elements show different images. This may be due to the heterogeneity of the extraterrestrial material itself, the extreme imbalance of the impact process and subsequent subsidence processes, and the differences in the local geochemical environment.