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首页> 外文期刊>Arabian Journal for Science and Engineering. Section A, Sciences >Late Cretaceous Calcareous Nannofossil Biostratigraphy and Paleoecology in the Northwestern Desert, Egypt
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Late Cretaceous Calcareous Nannofossil Biostratigraphy and Paleoecology in the Northwestern Desert, Egypt

机译：晚餐钙质钙质钙葡萄球菌生物科学照片和古生物在西北沙漠，埃及

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摘要

The Upper Cretaceous succession of the northwestern desert in Egypt comprises two distinctive formations distributed throughout the studied subsurface succession. These formations are the Abu Roash and the Khoman from base to top, respectively. The examination of the studied samples resulted in the identification of thirty-six calcareous nannoplankton species belonging to twenty-three genera. Based on calcareous nannoplankton assemblages, the studied El-Noor-1 borehole succession was subdivided into seven calcareous nannoplankton biozones. These biozones were correlated with those recorded in Egypt and in other parts of the world. The analyses of calcareous nannofossils revealed the presence of hiatuses between the Late Santonian and Late Campanian. Abundance, diversity, preservation, fertility indices and temperature indices of the Late Cretaceous calcareous nannofossils were analyzed to determine the paleoecology of the studied succession. According to the calcareous nannoplankton content, the studied successions are subdivided into five ecozones. The environment of each ecozone is interpreted. The environmental indicators point to warmer climate oligotrophic environments for the Lucianorhabdus cayeuxii, Reinhardtites levis, Arkhangelskiella cymbiformis and Micula murus zones and cooler climate eutrophic environments for the Quadrum trifidum, Tranolithus orionatus and Lithraphidites quadratus zones.
机译：埃及西北沙漠的上白垩纪连续包括两种分布在整个研究的地下连续的中间结构。这些地层分别是ABU ROASH和基座到顶部的Khoman。研究了研究的样品导致鉴定属于二十三个属的三十六种钙质甘露甘露枪物种。基于钙质Nannoplankton组装，研究的El-Noor-1钻孔连续分为七个钙质纳南甘露植物生物区域。这些生物沸石与埃及和世界其他地区的人相关联。钙质Nannofossils的分析揭示了Santonian和晚坎帕尼亚晚期之间的中断存在。分析了晚白垩纪钙质Nannofossils的丰富，多样性，保存，生育指标和温度指数，以确定研究继承的古生态。根据钙质纳诺血栓顿含量，研究的继承被细分为五个杂波。每个Ecozone的环境被解释。环境指标指标指出Lucianorhabdus Cayeuxii，Reinhardtites Levis，Arkhangelskiella Cymbiformis和MiCula Murus区和较冷的气候富营养化环境的升温的气候寡核苷酸环境，为四肢Trifivum，Tranolithus orionatus和Lithraphifites四云区区域。

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