铱异常

湖南省早寒武世石煤层的铱异常发现之后，人们纷纷从地球化学方面推测一次陨石撞击事件的可能性。

After discovery of iridium anomaly in Early Cambrian stone coal in Hunan province , scientistsbegan to guess the possibility of a meteorite impact event from geochemical aspects .

这些标志是界线粘土层、微球粒、铱异常、生物大规模绝灭、陨石作用等。

These marks are boundary clay layer , microspherules , high Iranomaly , mass extinction of organism and impact of meteorite .

奥陶纪末期的集群绝灭和铱异常的发现&来自长江三峡东部地区奥陶系/志留系界线剖面的例证

Terminal Ordovician mass extinction and discovery of iridium anomaly-an example from the Ordovician-Silurian boundary sec - tion , Eastern Yangtze Gorges area , china

用地壳元素钪进行标准化之后，铱异常十分明显，而其它元素在界线附近则没有变化。

On the Norm and Boundary After normalized with the typical terrestrial element Sc , iridium shows marked enrichment at the B / M boundary ;

遍布全球的K／T界线粘土层不仅存在着铱的丰度异常，其它铂族元素的含量也异常高，并且基本上保持着类似与地外物质中的丰度分布模式。

In the K / T boundary layers at all parts of the world , not only was there tremendous iridium anomaly , but the contents of other platinum group elements were enriched multiply as well . Additionally , the distribution patterns of PGEs were essentially consistent with extraterrestrial matter .

利用测定蛋壳的稳定同位素和铱元素富集异常探讨恐龙绝灭；

The dating of the stable isotope of the egg shell and the enrichment anomaly of Iridium is used to inquire into the extinction of the dinosaurs .

前人在该套地层底部发现了铱等元素异常，认为可作为划分其地质时代的依据。

Some elementary anomalies of indium and other elements have been found at the bottom of the stratum , it can be used as the evidence to separate geological era .

奥陶系与志留系界线处生物绝灭事件及其与铱和碳同位素异常的关系

Terminal Ordovician mass extinction and its relationship to iridium and carbon isotope anomalies