Geochemistry of intercalated red and gray pelagic shales from the Mazak Formation of Cenomanian age in Czech Republic

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dc.contributor.author Jiang, Shao-Yong
dc.contributor.author Jansa, Luba
dc.contributor.author Skupien, Petr
dc.contributor.author Yang, Jing-Hong
dc.contributor.author Valíček, Zdeněk
dc.contributor.author Hu, Xiu-Mian
dc.contributor.author Thao, Kui-Dong
dc.date.accessioned 2010-07-30T11:51:16Z
dc.date.available 2010-07-30T11:51:16Z
dc.date.issued 2010
dc.identifier.citation Episodes. 2009, vol. 32 , no. 1, p. 3-12. en
dc.identifier.issn 0705-3797
dc.identifier.uri http://hdl.handle.net/10084/78347
dc.description.abstract Pelagic red and gray shales are intercalated within the lower part of the Mazak Formation of Middle Cenomanian age in Czech Republic. A detailed geochemical study of major, trace and rare earth elements and carbon isotopic compositions of organic carbon has been conducted on sixteen red and gray shales. The data suggest that the shales were most likely accumulated in well-oxygenated bottom waters with very limited organic matter supply and consisted of marine organic matter mixed with minor amounts of terrestrial organic matter. The shales were deposited below CCD in one of the tectonic troughs developed along northern margin of the western Tethys. Similar geochemical covariances of major, trace and rare earth elements for the shales suggest palaeoceanographic conditions and provenance during their deposition. The most probable cause for the variation of redox bottom conditions in the mid-Cretaceous deep ocean was periodic changes in the concentration of dissolved oxygen in bottom waters, due to changes in deep water circulation and processes driven climate changes. en
dc.language.iso en en
dc.publisher International Union of Geological Sciences en
dc.relation.ispartofseries Episodes en
dc.relation.uri http://www.episodes.co.in/Contents/v32n1.pdf en
dc.title Geochemistry of intercalated red and gray pelagic shales from the Mazak Formation of Cenomanian age in Czech Republic en
dc.type Article en
dc.identifier.location Není ve fondu ÚK en
dc.identifier.wos 000279995100002

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