globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.02.009
论文题名:
A calcareous nannofossil and organic geochemical study of marine palaeoenvironmental changes across the Sinemurian/Pliensbachian (early Jurassic, ~191 Ma) in Portugal
作者: Plancq J.; Mattioli E.; Pittet B.; Baudin F.; Duarte L.V.; Boussaha M.; Grossi V.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 449
起始页码: 1
结束页码: 12
语种: 英语
英文关键词: Coccoliths ; Evolutionary events ; Hispanic Corridor ; Lipid biomarkers ; Productivity ; Sea-level
英文摘要: The Sinemurian/Pliensbachian boundary (~. 191 Ma) is acknowledged as one of the most important steps in the radiation of planktonic organisms, especially primary producers such as dinoflagellates and coccolithophores. To date, there is no detailed study documenting changes in planktonic assemblages related to palaeoceanographic changes across this boundary. The aim of this study is to characterize the palaeoenvironmental changes occurring across the Sinemurian/Pliensbachian boundary at the São Pedro de Moel section (Lusitanian Basin, Portugal) using micropalaeontology and organic geochemistry approaches. Combined calcareous nannofossil assemblage and lipid biomarker data document for a decrease in primary productivity in relation to a major sea-level rise occurring above the boundary. The Lusitanian Basin was particularly restricted during the late Sinemurian with a relatively low sea level, a configuration that led to the recurrent development of black shales. After a sharp sea-level fall, the basin became progressively deeper and more open during the earliest Pliensbachian, subsequently to a major transgression. This sea-level increase seems to have been a global feature and could have been related to the opening of the Hispanic Corridor that connected the Tethys and palaeo-Pacific oceans. The palaeoceanographic and palaeoclimatic changes induced by this opening may have played a role in the diversification of coccolithophores with the first occurrence or colonization of Tethyan waters by placolith-type coccoliths. © 2016 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68468
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作者单位: Univ Lyon, Université Claude Bernard Lyon 1, ENS de Lyon, CNRS, UMR 5276 LGL-TPE, Villeurbanne, France; Sorbonne Universités, UPMC Université Paris 06, UMR 7193, ISTeP, Paris, France; MARE-Marine and Environmental Sciences Centre, Faculty of Sciences and Technology, Department of Earth Sciences and University of Coimbra, Rua Sílvio Lima, Coimbra, Portugal; Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, Copenhagen, Denmark; School of Geographical and Earth Sciences, University of Glasgow, Glasgow, United Kingdom

Recommended Citation:
Plancq J.,Mattioli E.,Pittet B.,et al. A calcareous nannofossil and organic geochemical study of marine palaeoenvironmental changes across the Sinemurian/Pliensbachian (early Jurassic, ~191 Ma) in Portugal[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,449
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