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首页> 外文期刊>Arabian journal of geosciences >Chemostratigraphy of the Cenomanian-Turonian shallow-water carbonate: new correlation for the rudist levels from north Sinai, Egypt
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Chemostratigraphy of the Cenomanian-Turonian shallow-water carbonate: new correlation for the rudist levels from north Sinai, Egypt

机译：西诺曼尼亚-突尼斯浅水碳酸盐岩的化学地层学：来自埃及北西奈半岛的芦苇水平的新相关性

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摘要

The present study aims to provide carbon-isotope curves for the Cenomanian to Turonian rudist-dominated successions in north Sinai. The high-resolution carbon-isotope curves obtained from north Sinai sections provide new insight for calibrating the age of rudists as well as for evaluating the effects of the oceanic anoxic event 2 (OAE2) on rudist communities. The primary goals are (1) to provide a high-resolution sequence stratigraphic framework for the Cenomanian-Turonian succession, (2) to use rudist and ammonite biostratigraphic data to distinguish the stratigraphic levels of the rudist species, and (3) to integrate the chemostratigraphic (delta C-13) profile and the rudist levels to improve the biostratigraphy based on the rudist distributions and the carbon-isotope data. The recognition of three ammonite zones through the Cenomanian-Turonian succession was utilized to identify four temporally significant rudist levels indicative of the Lower Cenomanian, Middle Cenomanian, Upper Cenomanian, and Middle Turonian, respectively. Most of the rudists occur in the highstand deposits of medium-scale sequences. Carbon- and oxygen-isotopic analyses were carried out on both rudists and surrounding carbonate units. Based on the variations in the carbon-isotope signals, 12 chronostratigraphic segments were identified in the studied sections. The Cenomanian carbon-isotope segments (C23-C30) were obtained from the Halal Formation at Gabal Yelleg and Gabal Maaza sections, while the Turonian segments (C30-C34) were measured from the Wata Formation at Gabal Yelleg section. The carbon-isotope record from the studied sections is consistent with the trends documented in previous studies of the Tethyan realm. The Cenomanian-Turonian boundary is placed at the onset of falling carbon-isotope values (delta C-13) from 2.61 to -0.25 parts per thousand in the upper part of OAE2 with the carbon-isotope segment C30 at Gabal Yelleg. The negative shift in delta C-13 values (C33) occurred in the Middle Turonian lowstand deposits characterizing the global sea level fall during this interval.
机译：本研究旨在为西奈北部西诺曼期至土伦期的以斯图里亚斯为主的演替提供碳同位素曲线。从西奈河北段获得的高分辨率碳同位素曲线为标定徒的年龄以及评估海洋缺氧事件2（OAE2）对徒群落的影响提供了新的见识。主要目标是（1）为Cenomanian-Turonian演替提供高分辨率层序地层学框架;（2）使用鲁迪斯和铵矿生物地层学数据来区分鲁迪斯物种的地层水平，以及（3）整合根据地利司图分布和碳同位素数据，对化学地层（δC-13）剖面和地利司图水平进行改进，以改善生物地层学。通过对Cenomanian-Turonian演替的三个铵盐岩带的识别被用来识别四个在时间上具有重要意义的rudist级别，分别指示下Cenomanian，中Cenomanian，上Cenomanian和中Turonian。大多数rudists出现在中等规模序列的高位矿床中。碳同位素分析和氧同位素分析都在粗野分子和周围的碳酸盐单元上进行。根据碳同位素信号的变化，在研究的部分中确定了12个年代地层段。 Cenomanian碳同位素片段（C23-C30）是从Gabal Yelleg和Gabal Maaza剖面的清真岩层获得的，而Turonian片段（C30-C34）是从Gabal Yelleg剖面的Wata岩层测得的。来自研究部分的碳同位素记录与特提斯地区以前的研究中记录的趋势一致。 Cenomanian-Turonian边界位于OAE2上部的碳同位素值从2.61至千分之千下降的起点（δC-13）处，而碳同位素片段C30位于Gabal Yelleg。在该时间间隔内，特征为全球海平面下降的中突尼斯低水位沉积发生了δC-13值的负移（C33）。

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