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

Kele, Sándor, Sallam, Emad S., Capezzuoli, Enrico, Rogerson, Michael, Wanas, Hamdalla, Shen, Chuan-Chou, Lone, Mahjoor Ahmad, Yu, Tsai-Luen, Schauer, Andrew and Huntington, Katharine W. (2020) Were springline carbonates in the Kurkur-Dungul area (Southern Egypt) deposited during glacial periods? Journal of the Geological Society. jgs2020-147. ISSN 0016-7649 (In Press)

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Official URL: https://doi.org/10.1144/jgs2020-147

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 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 TΔ47 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 authors in concluding that formation of springline deposit formation was likely delayed compared to rainfall, due to aquifer flow distances. This delay is unlikely sufficient to explain why rainfall is out of phase movements of the monsoon belts, but may complicate interpretation of these records.

Item Type: Article
Uncontrolled Keywords: Desert tufa, Southern Egypt, Facies analysis, Stable and clumped isotopes, U−Th dating
Subjects: F800 Physical and Terrestrial Geographical and Environmental Sciences
Department: Faculties > Engineering and Environment > Geography and Environmental Sciences
Depositing User: John Coen
Date Deposited: 06 Jan 2021 12:36
Last Modified: 06 Jan 2021 12:45
URI: http://nrl.northumbria.ac.uk/id/eprint/45135

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