搜索结果: 1-2 共查到“理学 Cretaceous-Tertiary Boundary”相关记录2条 . 查询时间(0.075 秒)
Iridium concentration and noble gas composition of Cretaceous-Tertiary boundary clay from Stevns Klint, Denmark
K-T boundary, iridium, noble gas
2017/8/10
The Cretaceous-Tertiary (K-T) boundary about 65 million years ago records a mass extinction event caused by a bolide impact. K-T boundary clay collected from Stevns Klint, Denmark was investigated in ...
Origin and Clay-Mineral Genesis of the Cretaceous/Tertiary Boundary Unit, Western Interior of North America
Claystone Ejecta Glass alteration Halloysite Kaolinite K/T boundary unit Meteorite impact SEM XRD
2011/12/1
Abstract: A 3-cm-thick, two-layered clay unit that records mineralogic and textural evidence of a catastrophic event that occurred at a time now marked as the end of the Cretaceous Period was preserve...