DOI: 10.1016/j.palaeo.2013.04.013
论文题名: Carbon isotope excursions in Boreal Jurassic-Cretaceous boundary sections and their correlation potential
作者: Dzyuba O.S. ; Izokh O.P. ; Shurygin B.N.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 381-382 起始页码: 33
结束页码: 46
语种: 英语
英文关键词: Belemnites
; Carbon and oxygen isotopes
; Jurassic-Cretaceous boundary
; Siberia
英文摘要: The Jurassic-Cretaceous (J-K) boundary is one of the most problematic points on the geological timescale. The boundary is not defined by a Global Stratotype Section and Point (GSSP) because of the absence of well-defined (by significant faunal turnover), widely correlatable biostratigraphic levels to fix the base of the Berriasian. A distinct earliest Berriasian positive carbon isotope excursion is identified in the Boreal marine carbonate (belemnites) carbon records from the Maurynya River (Northern Urals) and the Nordvik Peninsula (northern East Siberia). The excursion is found within the top part of the upper Volgian Craspedites taimyrensis ammonite Zone, slightly above the J-K boundary, which was established by palaeomagnetic data. Because a significant positive δ13C shift was also observed immediately above the J-K boundary in the Tethyan Guppen-Heuberge pelagic-carbonate section (Switzerland), this positive carbon isotope event can be regarded as a useful marker for a Panboreal and Boreal-Tethyan correlation of J-K boundary beds. This δ13C excursion is interpreted as a record of increased rates of organic carbon burial. The δ13C data obtained previously for the upper Volgian and Ryazanian in different Boreal regions are also analysed in this paper. Other well-documented carbon isotope excursions with less global significance allow the creation of a composite carbon-isotope curve for Boreal regions that characterises the upper Volgian and Ryazanian in detail. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69728
Appears in Collections: 过去全球变化的重建
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作者单位: Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of RAS, Acad. Koptyug av., 3, Novosibirsk 630090, Russian Federation; Sobolev Institute of Geology and Mineralogy, Siberian Branch of RAS, Acad. Koptyug av., 3, Novosibirsk 630090, Russian Federation
Recommended Citation:
Dzyuba O.S.,Izokh O.P.,Shurygin B.N.. Carbon isotope excursions in Boreal Jurassic-Cretaceous boundary sections and their correlation potential[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,381-382