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首页> 外文期刊>Journal of African Earth Sciences >Paleoecology of the middle Eocene ostracods of Egypt
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Paleoecology of the middle Eocene ostracods of Egypt

机译：埃及中始新世成龙类古生态

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摘要

Data on one hundred and three ostracod species belonging to forty-one genera from the middle Eocene sediments of Egypt have been subjected to appropriate multivariate data analyses techniques in order to reconstruct the paleoenvironment. The most common ostracod species of the studied regions belong to the genera: Cytherella, Paracosta, Bairdia and Reticulina (these species represent more than 32% of the total number of the studied ostracod species). Cluster analysis based on the neighbour joining clustering method (Jukes-Cantor similarity measure) of eleven rock units and fifty ostracod species suggested the separation of these rock units according to their ages under the control of their geographical distribution within the studied regions. On the other hand, Factor Analysis (based on the varimax rotation technique) of the same data matrix aided to detect four paleoenvironmental factors affected the distribution of the ostracod assemblages. The first factor discloses the turbulence of water; the second factor corresponds to the degree of salinity of water; the third factor signifies the water depth associated with oscillation in the oxygen content; the fourth factor demonstrates the temperature of water in the euphoric zone exposure to water depth. Moreover, ten ostracod biofacies with specific paleoenvironmental conditions were recognized. Outstandingly, it seems prominently that paleoenvironmental changes had shaped the distribution of the middle Eocene ostracods of Egypt rather than origination or extinction.
机译：为了重建古环境，已经对来自埃及始新世中期沉积物的41个属的131种兽脚类物种的数据进行了适当的多元数据分析技术。研究区域中最常见的兽类物种属于以下属：Cytherella，Paracosta，Bairdia和Reticulina（这些物种占所研究兽类总数的32％以上）。基于11个岩石单元和50个兽类物种的近邻联接聚类方法（Jukes-Cantor相似性度量）的聚类分析表明，在研究区域内，根据其年龄分布，这些岩石单元根据其年龄进行了分离。另一方面，对同一数据矩阵进行因子分析（基于varimax旋转技术）有助于检测四个古环境因素，这些因素影响了兽类组合的分布。第一个因素是水的湍流。第二个因素对应于水的盐度;第三个因素表示与氧气含量波动有关的水深;第四个因素表明欣快带中的水温暴露于水深。此外，还发现了十种具有特定古环境条件的兽类生物相。突出地讲，古环境变化明显地影响了埃及中始新世成龙的分布，而不是起源或灭绝。

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