DOI: 10.1016/j.marmicro.2020.101823
论文题名: Quantitative Middle Eocene benthic foraminiferal biofacies from west-central Sinai, Egypt: Implications to paleobathymetry and sequence stratigraphy
作者: Farouk S. ; Jain S. ; Belal N. ; Omran M. ; Al-Kahtany K.
刊名: Marine Micropaleontology
ISSN: 3778398
出版年: 2020
卷: 155 语种: 英语
英文关键词: Egypt
; Middle Eocene
; Paleobathymetry
; Paleoproductivity
; Sequence Stratigraphy
Scopus关键词: bathymetry
; benthic foraminifera
; biofacies
; biostratigraphy
; Eocene
; global warming
; paleoproductivity
; quantitative analysis
; sequence stratigraphy
; Egypt
; Bolivina
; Bulimina
; Discorbis
; Foraminifera
; Lenticulina
; Spiroloculina
; Uvigerina
; Uvigerina mediterranea
英文摘要: The basinal depositional architecture, paleobathymetry and paleoproductivity assessment of west central Sinai (Egypt) lacks robust sequence stratigraphic framework inferred in conjunction with changes in benthic foraminiferal biofacies. Sinai is an economically important region for hydrocarbon exploration, hence understanding its depositional architecture is fundamental. For this, the planktic foraminifera biostratigraphy is done first to date the strata exposed at Wadi Nukhul, and then, the quantitative benthic foraminiferal biofacies are evaluated to infer changes in paleobathymetry and paleoproductivity. Five Eocene planktic biozones identified (E7b to E11), spanning 48.6 to 40.4 Ma are identified along with five 3rd order depositional sequences bounded by four sequence boundaries. Quantitative (Rotated factor analysis) benthic foraminiferal analysis revealed seven benthic foraminifera biofacies (A to F) suggesting a meso- to eutrophic, outer neritic, moderate to low oxygenated bottom waters, dominated largely by benthic foraminifera taxa, Bulimina, Uvigerina, Bolivina and Lenticulina. Exception to this trend is the presence of biofacies B (Discorbis ciperensis-Lenticulina cuvillieri) at the top of the Thebes Formation that reflects well‑oxygenated bottom waters straddling the middle to outer neritic depth boundary. The inferred relative sea level gradually decreases throughout the studied section (from bottom to top) and is consistent with a gradual global decline. Of interest is the possible identification of the Middle Eocene Climatic Optimum (~40.5–40 Ma), a global warming event that in the present study, encompasses the Uvigerina mediterranea-Spiroloculina esnaensis biofacies (Biofacies A) suggesting the presence of mesotrophic but moderately well‑oxygenated bottom waters at outer neritic depths. The base of the Thebes Formation is marked by the presence of an Oxygen Minimum Zone. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158954
Appears in Collections: 气候变化与战略
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作者单位: Exploration Department, Egyptian Petroleum Research Institute, Nasr City, 11727, Egypt; Department of Geology, School of Applied Natural Science, Adama Science and Technology University, Adama, Oromia 1888, Ethiopia; Geology Department, Faculty of Science, Damietta University, New Damietta, 34517, Egypt; Seismic Studies Center, Geology and Geophysics Department, College of Science, King Saud University, Saudi Arabia
Recommended Citation:
Farouk S.,Jain S.,Belal N.,et al. Quantitative Middle Eocene benthic foraminiferal biofacies from west-central Sinai, Egypt: Implications to paleobathymetry and sequence stratigraphy[J]. Marine Micropaleontology,2020-01-01,155