Were springline carbonates in the Kurkur-Dungul area (Southern Egypt) deposited during glacial periods?

Sándor Kele*, Emad S. Sallam, Enrico Capezzuoli, Mike Rogerson, Hamdalla Wanas, Chuan-Chou Shen, Mahjoor Ahmad Lone, Tsai-Luen Yu, Andrew Schauer, Katharine W. Huntington

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The tufa deposits in the Kurkur–Dungul area, southern Egypt, date from marine isotope stage (MIS) 11 to MIS 1. Springs across the region were active during glacial periods (with sea-level below –50 m), reflecting changed atmospheric circulation over the Indian Ocean, as well as peak interglacial periods. During times of low sea-level, reduced Indonesian throughflow promoted formation of an Indian Ocean Warm Pool, and anomalous rainfall on its western margin. We suggest that Egypt lies at the intersection of westerly (‘maghrebian’) and easterly (‘mashriqian’) rainfall provinces, which show different timing with relation to orbital forcing and different source water regions. Tufa-growth periods are therefore not mechanistically linked to ‘humid periods’ or ‘sapropel events’ identified elsewhere. Stable isotope and T(Δ47) data are also inconsistent with these spring systems being part of a larger system spanning northern Africa, and lack a clear interaction between northern hemisphere heating and mid-latitude rainfall. We also follow previous researchers in concluding that formation of springline deposit formation was probably delayed compared with rainfall, owing to aquifer flow distances. This delay is unlikely to be sufficient to explain why rainfall is out of phase with movements of the monsoon belts, but may complicate interpretation of these records.Supplementary material: A lithofacies description and supplementary figures and tables are available at https://doi.org/10.6084/m9.figshare.c.5246661
Original languageEnglish
Article numberjgs2020-147
Number of pages18
JournalJournal of the Geological Society
Volume178
Issue number3
Early online date28 Dec 2020
DOIs
Publication statusPublished - 1 May 2021

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