DOI: 10.1016/j.palaeo.2016.12.017
论文题名: Neritic carbonate crisis during the Early Bajocian: Divergent responses to a global environmental perturbation
作者: Bodin S. ; Hönig M.R. ; Krencker F.-N. ; Danisch J. ; Kabiri L.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
卷: 468 起始页码: 184
结束页码: 199
语种: 英语
英文关键词: Carbon isotopes
; Drowning
; High Atlas
; Jurassic
; Morocco
英文摘要: The Early Bajocian witnessed a global environmental perturbation, characterized by faunal and floral turnovers and a positive carbon isotope excursion. In Italy, this environmental perturbation coincided with an eutrophication event and a carbonate crisis, but this has so far not been adequately reported from other settings, leaving doubt about the extent and nature of these phenomena. In this paper, we are reporting on an extensive neritic carbonate factory demise that occurs in the upper Lower Bajocian of Morocco, more precisely in the upper Propinquans – lower Humphriesianum Zones. This demise coincided with the acme of the global carbon isotope perturbation, recorded by a 3‰ positive carbon isotope excursion in the bulk organic matter of Morocco, but not in the micritic phase, due to the fact that the Moroccan carbonate δ13C record is more sensitive to local rather than global influences. Furthermore, we observe that the Lower Bajocian of Morocco is relatively enriched in arenitic siliciclastic deposits, suggesting increased weathering and nutrient levels along the northwestern margin of Africa during the Early Bajocian. However, comparison with neighboring European basins highlights the non-uniqueness and different timing of the response of shallow-water carbonates to the Early Bajocian environmental perturbations, as some regions present no sign of carbonate factory crisis. Hence, we postulate that local factors were important in mediating the response of neritic carbonate factories to this global environmental perturbation. We notably highlight the role of large Early Bajocian sea-level fluctuation as a trigger for carbonate factory change and demise in Morocco. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/67966
Appears in Collections: 过去全球变化的重建
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作者单位: Ruhr-Universität Bochum, Institut für Geologie, Mineralogie und Geophysik, Bochum, Germany; Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, Aarhus C, Denmark; Department of Earth Science and Engineering, Imperial College London, Prince Consort Road, London, United Kingdom; Faculty of Science and Techniques, University of Errachidia, BP 509, Errachidia, Boutalamine, Morocco
Recommended Citation:
Bodin S.,Hönig M.R.,Krencker F.-N.,et al. Neritic carbonate crisis during the Early Bajocian: Divergent responses to a global environmental perturbation[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01,468