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Distribution of foraminifera in the Arabian Gulf

机译:阿拉伯海湾有孔虫的分布

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Ninety-eight foraminiferal species identified in forty sediment samples collected from different parts of the Arabian Gulf (Persian Gulf) are illustrated and their distribution investigated. The identified foraminiferal fauna of the Gulf consists of 15% Textulari-ina (agglutinated forms), 37% Miliolina (porcellaneous forms), 0.1% Lagenina, 1 % Globigerinina (planktic forms) and 47% Rotaliina (the last mentioned three suborders constituting the hyaline forms). Cluster analysis of quantitative data on the distribution of tests of foraminiferal species in the samples allow us to determine four assemblages, generally corresponding to the major geomorphic provinces of the Gulf: a western Iranian Shallow Shelf assemblage, an assemblage distributed all over the Axial Zone of the Arabian Gulf, a deep water assemblage of the Central Basin of the Gulf extending up to the Strait of Hormuz and an Arabian Shallow Shelf assemblage. The study of the geographical distribution of these assemblages and their relation to major geographical characteristics of the surrounding lands suggests that the nature of the foraminiferal assemblages depends mainly on biotic factors. The fauna of the Iranian Shelf displays a high diversity (average Yule-Simpson diversity index for the assemblage 39.2) as it receives an appreciable amount of nutrients from drainages in the topographically high Iranian hinterland. The fauna of the Arabian Shelf displays relatively low diversities (average Yule-Simpson diversity index for the assemblage 16.1) as the arid Arabian hinterland is practically deprived of active drainage. The foraminiferal fauna of the deepest parts of the investigated localities display low diversities and include appreciable proportions of agglutinated forms. Lowest diversities are observed near the Strait of Hormuz (Yule-Simpson diversity index of 14.9), highest diversities near the mouth of Shatt Al-Arab (Yule-Simpson diversity index of 62.9). This suggests that the amounts of nutrients provided by drainages debouching in a landlocked basin is an important factor determining the constitution of the foraminifera of bottom sediments.
机译:说明了从阿拉伯海湾(波斯湾)不同地区收集的40种沉积物样品中鉴定出的98种有孔虫物种,并对其分布进行了调查。墨西哥湾已确定的有孔虫动物群包括15%的Textulari-ina(凝集形式),37%的Miliolina(多孔形式),0.1%的Lagenina,1%的Globigerinina(浮游形式)和47%的Rotaliina(最后提到的三个亚目构成了透明形式)。关于样本中有孔虫物种测试分布的定量数据的聚类分析使我们能够确定四个组合,这些组合通常对应于海湾的主要地貌省份:伊朗西部浅层组合,分布在整个墨西哥的轴心区阿拉伯海湾,是海湾中部盆地的深水组合,一直延伸到霍尔木兹海峡,还有阿拉伯浅层组合。对这些组合的地理分布及其与周围土地主要地理特征的关系的研究表明,有孔虫组合的性质主要取决于生物因素。伊朗大陆架的动物区系具有很高的多样性(该组合的平均Yule-Simpson多样性指数为39.2),因为它从地形高的伊朗内陆地区的排水渠中吸收了可观的养分。阿拉伯大陆架的动物区系显示出相对较低的多样性(该组合的平均Yule-Simpson多样性指数为16.1),因为干旱的阿拉伯腹地几乎没有活跃的排水系统。被调查地区最深处的有孔虫动物群显示低多样性,并且包括相当比例的凝集形式。在霍尔木兹海峡附近观测到最低的多样性(Yule-Simpson多样性指数为14.9),在Shatt Al-Arab口附近观测到最高的多样性(Yule-Simpson多样性指数为62.9)。这表明,内陆盆地排水系统排水所提供的养分含量是决定底部沉积物有孔虫组成的重要因素。

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