DOI: 10.1007/s00531-015-1192-0
Scopus记录号: 2-s2.0-84929688382
论文题名: The end-Cretaceous in the southwestern Tethys (Elles, Tunisia): orbital calibration of paleoenvironmental events before the mass extinction
作者: Thibault N. ; Galbrun B. ; Gardin S. ; Minoletti F. ; Le Callonnec L.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2016
卷: 105, 期: 3 起始页码: 771
结束页码: 795
语种: 英语
英文关键词: Calcareous nannofossils
; Cyclostratigraphy
; Late Maastrichtian
; Paleoecology
; Stable isotopes
Scopus关键词: calibration
; Cretaceous
; cyclostratigraphy
; mass extinction
; nanofossil
; paleoclimate
; paleoecology
; paleoenvironment
; stable isotope
; Tethys
; Elles
; Kef
; Tunisia
; Lithraphidites
; Micula
; Zeugrhabdotus
英文摘要: An integrated study of magnetic mass susceptibility (MS), bulk stable isotopes and calcareous nannofossil paleoecological changes is undertaken on the late Maastrichtian of the Elles section, Tunisia, spanning the last ca. 1 Myr of the Cretaceous. A cyclostratigraphic analysis reveals the presence of Milankovitch frequencies and is used for proposal of two distinct orbital age models and to provide ages of important stratigraphic horizons, relative to the age of the Cretaceous–Paleogene boundary (K–PgB). Principal component analysis (PCA) performed on the nannofossil assemblage reveal two main factors, PCA1, mostly representing fluctuations of D. rotatorius, P. stoveri, Lithraphidites spp., Retecapsa spp., Staurolithites spp., Micula spp., and PCA2, mostly representing fluctuations of A. regularis, C. ehrenbergii, Micula spp., Rhagodiscus spp., W. barnesiae and Zeugrhabdotus spp. Variations in PCA1 and PCA2 match changes in bulk δ13C and δ18O, respectively, and suggest changes in surface-water fertility and temperatures and associated stress. The variations in abundances of high-latitude taxa and the warm-water species Micula murus and in bulk δ18O delineate fast changes in sea-surface paleotemperatures. As in many other sites, an end-Maastrichtian greenhouse warming is highlighted, followed by a short cooling and an additional warm pulse in the last 30 kyr of the Maastrichtian which has rarely been documented so far. Orbital tuning of the delineated climatic events is proposed following the two different age models. Calcareous nannofossil assemblages highlight a decrease in surface-water nutriency, but their species richness remains high through the latest Maastrichtian, indicating, in Tunisia, a weak impact of Deccan volcanism on calcareous nannoplankton diversity before the mass extinction. © 2015, Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84929688382&doi=10.1007%2fs00531-015-1192-0&partnerID=40&md5=f8c12464d3ebf229b395454c16dd7e98
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70184
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: IGN, University of Copenhagen, Øster Voldgade 10, Copenhagen K, Denmark; Institut des Sciences de la Terre Paris (ISTeP), UMR 7193, UPMC Univ Paris 06, Sorbonne Universités, Paris, France; Centre de Recherche sur la Paléobiodiversité et les Paléoenvironnements, UMR 7072, UPMC Univ Paris 06, Sorbonne Universités, Paris, France
Recommended Citation:
Thibault N.,Galbrun B.,Gardin S.,et al. The end-Cretaceous in the southwestern Tethys (Elles, Tunisia): orbital calibration of paleoenvironmental events before the mass extinction[J]. International Journal of Earth Sciences,2016-01-01,105(3)