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Major transgression during Late Cretaceous constrained by basin sediments in northern Africa： implication for global rise in sea level

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Frontiers of Structural and Civil Engineering 2017年第4期11卷 740-750页

作者： Kaixuan AN Hanlin CHEN Xiubin LIN Fang WANG Shufeng YANG Zhixin WEN Zhaoming WANG Guangya ZHANG Xiaoguang TONG School of Earth Sciences Zhejiang University Hangzhou 310027 China Research Center for Structures in Oil- and Gas-Bearing Basins Ministry of Education Hangzhou 310027 China Research Institute of Petroleum Exploration and Development PetroChina Co. Ltd Beijing 100083 China China National Oil and Gas Exploration and Development Corporation Beijing 100083 China

The global rise in sea level during the Late Cretaceous has been an issue under discussion by the international geological community. Despite the signifi- cance, its impact on the deposition of continental basins is not well known. This paper presents the systematic review on stratigraphy and sedimentary facies compiled from 22 continental basins in northern Africa. The results indicate that the region was dominated by sediments of continental facies during Early Cretaceous, which were replaced by deposits of marine facies in Late Cretaceous. The spatio- temporal distribution of sedimentary facies suggests marine facies deposition reached as far south as Taou- deni-Iullemmeden-Chad-A1 Kufra-Upper Egypt basins during Turonian to Campanian. These results indicate that northern Africa underwent significant transgression during Late Cretaceous reaching its peak during Turonian to Coniacian. This significant transgression has been attributed to the global high sea-level during this time. Previous studies show that global rise in sea level in Late Cretaceous may have been driven by an increase in the volume of ocean water （attributed to high C02 concentra- tion and subsequently warm climate） and a decrease in the volume of the ocean basin （attributed to rapid production of oceanic crust and seamounts）. Tectonic mechanism of rapid production of oceanic crust and seamounts could play a fimdamental role in driving the global rise in sea level and subsequent transgression in northern Africa during Late Cretaceous.

关键词： global sea-level changes Late Cretaceous,transgression sedimentary facies northern Africa

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