报告题目：Resolving the effects of sea level change versus tectonic deformation on syn-rift cyclo-sequence stratigraphy: a case study from the Gulf of Suez, Egypt
报告人：Raed Badr博士
报告人单位：开罗大学
时间：2024年2月29日（周四）下午2:30
报告地点：南京古生物所图书馆三楼报告厅
主办：重点实验室、科技处、人教处
报告简介
To resolve how sedimentation is influenced by eustatic sea-level change and tectonic deformation, we carried out a comprehensive analysis of syn-rift deposits of the Wadi Baba area on the eastern margin of the Gulf of Suez, Egypt. By comparing physical stratigraphic data with age constraints from biostratigraphy, Sr isotope stratigraphy and benthic foraminiferal d18O data, we established a temporal range of 21.2 to <15.9 Myr (Aquitanian-early Langhian) for the studied section and made the following observations:
1. During the early rifting stage (21.2 to 19.1 Mry), sea-level change mainly controlled the timing and development of shallow-marine sedimentary cyclicity, and the cycles were influenced by the 400 kry eccentricity-forced climatic variability.
2. Tectonic subsidence was sufficient to outpace the eustatic sea-level falls at the end of the eccentricity-driven eustatic cycles. During rift-climax (19.1 to <15.9 Mry), increased tectonic subsidence/tilting and sediment influx masked the effect of eustasy.
3. We found that low-gradient tectonic settings such as hanging wall dip slopes can preserve eustatic-induced stratigraphic cyclicity, unlike dynamic high-gradient settings around propagating faults, which mask or distort eustatic signals.
4. During tectonic quiescence stages, sea-level falls contributed to the development of some sequence boundaries that correspond to the global Mi1ab and Mi2 events.
图1 埃及苏黎世海湾中新世浅海沉积序列
报告人简介
Raed Badr 博士于2008年5月在开罗大学获得地质学和化学双学士学位，并在2022年获得沉积地质学的博士学位后留校担任讲师。自2013年7月至今他同时兼职担任埃及EREX石油顾问公司的高级沉积学家。他的专长为沉积学和层序地层学。Raed博士已经以第一或主要作者身份在Sedimentary Geology和 Journal of Asian Earth Science等期刊发表论文3篇。这次讲座中Raed将介绍他自2023年7月以来在南古所开展的PIFI项目合作研究。
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