Response of foraminiferal assemblages on the middle Eocene climatic optimum and following climatic transition in the shallow tropical sea (the south Fayoum area, Egypt)

Foraminiferal assemblages from 4 sections (totalling 158 samples) were quantitatively analysed to reconstruct paleoenvironmental changes in inner to outer shelf, tropical epicontinental sea of the southern Peritethys area around the middle Eocene climatic optimum. In comparison with bathyal oceanic...

Full description

Saved in:
Bibliographic Details
Published in:Arabian journal of geosciences 2017, Vol.10 (2), p.1-21, Article 43
Main Authors: Helal, Sobhi, Holcová, Katarína
Format: Article
Language:English
Subjects:
Area
Bottom water
Carbonates
Cooling
Cooling systems
Earth and Environmental Science
Earth science
Earth Sciences
Eocene
Eutrophic environments
Eutrophic waters
Eutrophication
Foraminifera
Hypoxia
Mineral nutrients
Original Paper
Oscillations
Runoff
Sea level
Tropical climate
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Foraminiferal assemblages from 4 sections (totalling 158 samples) were quantitatively analysed to reconstruct paleoenvironmental changes in inner to outer shelf, tropical epicontinental sea of the southern Peritethys area around the middle Eocene climatic optimum. In comparison with bathyal oceanic sites, shelf assemblages from Fayoum area are strongly influenced by climatically forced sea-level oscillations and aridification in cooling post-MECO interval. Pre-MECO interval can be characterized by gradual deepening and hypoxic, eutrophic bottom water. The maximal deepening during the temperature peak was associated with destruction of hypoxic bottom water. Sea-level fall, nutrient decrease and salinity increase in marginal part of basin due to decreased continental runoff caused by aridification was suggested for post-MECO cooling interval. Clastic-carbonate system of the warming period and thermal maximum was changed to only carbonate system of cooling post-MECO period.
ISSN:1866-7511
1866-7538
DOI:10.1007/s12517-016-2818-7