Boreal-tethyan correlation of the Jurassic-Cretaceous boundary interval by magneto- and biostratigraphy

被引：0

作者：

V. Houša

P. Pruner

V. A. Zakharov

M. Kostak

M. Chadima

M. A. Rogov

S. Šlechta

M. Mazuch

机构：

[1] Czech Academy of Sciences,

[2] Geological Institute of RAS,undefined

[3] Charles University,undefined

来源：

Stratigraphy and Geological Correlation | 2007年 / 15卷

关键词：

Jurassic-Cretaceous boundary; Boreal and Tethyan deposits; magnetostratigraphy; biostratigraphy; Northern Siberia;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

As a result of detail sampling and paleomagnetic study of the 27-m-thick section of Jurassic-Cretaceous boundary beds in the Nordvik Peninsula (Anabar Bay, Laptev Sea), a succession of M-zones correlative with chrons M20n-M17r is established for the first time in the Boreal deposits. Inside the normal polarity zone corresponding to Chron M20n, a thin interval of reversed polarity, presumably an equivalent of the Kysuca Subzone (M20n.1r), is discovered. The other thin interval of reversed polarity established within the next normal polarity zone (M19n) is correlated with the Brodno Subzone (M19n.1r). The same succession of normal and reversed polarity zones has been discovered recently in the Jurassic-Cretaceous boundary beds of the Tethyan sections: in the Bosso Valley (Italy), at the Brodno (Slovak Republic) and Puerto Escaño (Spain) sites. Correlation of successions established lead us to conclusion, that the Jurassic-Cretaceous boundary corresponds in the Panboreal Superrealm to a level within the Craspedites taimyrensis Zone of the upper Volgian Substage. Hence, the greatest part of Volgian Stage should be included into the Jurassic System. Biostratigraphic data do not contradict this conclusion.

引用

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