https://scholars.lib.ntu.edu.tw/handle/123456789/606203
標題: | Were springline carbonates in the kurkur–dungul area (Southern Egypt) deposited during glacial periods? | 作者: | Kele S Sallam E.S Capezzuoli E Rogerson M Wanas H Shen C.-C Lone M.A Yu T.-L Schauer A CHUAN-CHOU SHEN Mahjoor Ahmad Lone |
關鍵字: | Aquifers;Deposits;Glacial geology;Isotopes;Sea level;Atmospheric circulation;Deposit formation;Indonesian throughflow;Interglacial periods;Marine isotope stages;Northern Hemispheres;Orbital forcing;Stable isotopes;Rain;atmospheric circulation;carbonate;glaciation;marine isotope stage;monsoon;paleoclimate;rainfall;tufa;Egypt;Indian Ocean | 公開日期: | 2021 | 卷: | 178 | 期: | 3 | 來源出版物: | Journal of the Geological Society | 摘要: | 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 OceanWarm 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. ? 2021 The Author(s). |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85101449324&doi=10.1144%2fjgs2020-147&partnerID=40&md5=99f75c8f78f1f93de0f473bc9988408b https://scholars.lib.ntu.edu.tw/handle/123456789/606203 |
ISSN: | 00167649 | DOI: | 10.1144/jgs2020-147 |
顯示於: | 地質科學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。