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首页> 外文期刊>Journal of Asian earth sciences >Cenomanian-turonian stable isotope signatures and depositional sequences in northeast Egypt and central Jordan
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Cenomanian-turonian stable isotope signatures and depositional sequences in northeast Egypt and central Jordan

机译：埃及东北部和约旦中部的Cenomanian-turonian稳定同位素特征和沉积序列

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摘要

Lithostratigraphic, biostratigraphic and microfacies studies of two Cenomanian-Turonian shallow marine, siliciclastic-carbonate successions at Gebel Ekma plateau (southwestern Sinai, Egypt) and Wadi Karak section (central Jordan) are calibrated with delta C-13-, profiles to reveal relative sea-level changes within a sequence stratigraphic framework. The study provides significantly enhanced stratigraphic resolution and key sections for regional correlation. Lithofacies are dominated by well-developed peritidal to subtidal facies associations indicating deposition in a rimmed carbonate shelf setting. Biostratigraphic analysis indicates the presence of 6 ammonite zones, 3 calcareous nannofossil zones and 3 planktonic foraminiferal zones within the Cenomanian to Turonian succession. Six, third-order depositional sequences, bounded by correlatable sequence boundaries can be traced across the African-Arabian platform. Comparison with delta C-13 records in deeper water pelagic sequences help to improve the resolution of the boundaries of each depositional sequence. Recognition of time gaps at the sequence boundaries on the platform, recorded in different parts of African-Arabian platform, is attributed to local tectonic activity, associated with the change from passive to active margins, Which are overprinted by the global eustatic signature. (C) 2016 Elsevier Ltd. All rights reserved.
机译：用三角洲C-13-校准了两个位于西贝尔西南部的埃及Gebel Ekma高原和约旦中部的Wadi Karak剖面的西诺曼-土伦浅海，硅质碳酸盐岩演替的岩石地层学，生物地层学和微相研究。层序地层框架内的层级变化。该研究为地层对比提供了显着增强的地层分辨率和关键剖面。岩相以发育良好的海相至潮下相联系为主，表明在碳酸盐岩架的边缘沉积。生物地层学分析表明，在西诺曼尼亚至土伦期的演替过程中，有6个铵矿带，3个钙质纳米化石带和3个浮游有孔虫带存在。可以在整个非洲-阿拉伯平台上追踪由相关序列边界界定的六阶三阶沉积序列。与深水深海层序中的δC-13记录进行比较有助于提高每个沉积层序边界的分辨率。在非洲-阿拉伯平台的不同部分中记录的平台序列边界处的时间间隙的识别归因于局部构造活动，该活动与从被动边缘到主动边缘的变化相关，而全局上的欣喜签名覆盖了这一部分。 （C）2016 Elsevier Ltd.保留所有权利。

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