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统计广西中泥盆世不同沉积相区二十条剖面的腕足动物化石记录共计13目45科69属167种,其中Eifelian期47属73种,Givetian期32属100种。对不同级别分类单元的多样性分析表明,从Eifelian期到Givetian期,不仅腕足动物各个目的组成及多样性结构有明显改变,而且各个时期不同沉积环境下的腕足动物多样性也有明显差异,主要表现近岸和远岸环境下多样性较低,而浅海碳酸盐岩台地环境多样性较高。该多样性的空间分布特征与通过样本聚类分析识别出的腕足动物分布范围具有显著一致性。这一结果,清晰地表明腕足动物多样性分布与岩相和沉积环境分布存在一定联系。
A total of 167 species belonging to 69 genera, 13 orders, 45 families and 13 species belonging to 69 genera, 13 orders, and 45 species belonging to 73 genera in Eifelian period and 100 species in 32 genera of Givetian period were collected from 20 sections of the Middle Devonian sedimentary facies in Guangxi. The diversity analysis of taxa at different levels shows that not only the individual composition and diversity of the brachiopods changed significantly from Eifelian period to Givetian period, but also the differences of brachiopods diversity in different depositional environments at different periods. The main manifestations The diversity is low in nearshore and far-shore environments, while the environmental diversity in shallow-sea carbonate platforms is high. The spatial distribution of this diversity is significantly consistent with the range of brachiopods identified by cluster analysis. This result clearly shows that the distribution of brachiopod species diversity is related to the distribution of lithofacies and sedimentary environment.