Appraisal of middle Floian (Lower Ordovician) conodont diversity of the Precordillera and Cordillera Oriental, Argentina: Paleobiogeographical implications

IF 1.5 4区地球科学 Q2 PALEONTOLOGY

Marine Micropaleontology Pub Date : 2023-06-01 DOI:10.1016/j.marmicro.2023.102259

E. Kristal Rueda , Guillermo L. Albanesi

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Abstract

In this paper we compare the diversity of Floian (Lower Ordovician) conodonts from the Precordillera with that of the Cordillera Oriental, Argentina. The comparative analysis is restricted to the middle Floian Stage Slice (Fl2) from correlative intervals: Oepikodus evae Zone (Juanognathus variabilis Subzone) in the Precordillera and the Gothodus andinus Zone in the Cordillera Oriental. For the comparative analysis, absolute frequency tables of the conodont data from published articles and collections under study, were prepared. These include four sections of the Precordillera with 13 samples recovered from the middle section of the carbonate San Juan Formation, and six sections of the Cordillera Oriental with 28 samples from the middle-upper section of the shaly Acoite Formation. Diversity patterns and indices were generated from absolute frequencies using the software PAST 4.03. Remarkable differences in the species richness and diversity between coeval communities of referred basins are displayed. Comparisons with other basins elsewhere suggest that the paleolatitudinal gradient is not a major factor controlling changes in diversity, which may be due to a response to the complex interaction of biological and physico-chemical factors.

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阿根廷东科迪勒拉岛和前科迪勒拉岛中弗洛阶（下奥陶世）牙形刺多样性的评价：古生物地理学意义

本文比较了阿根廷科迪勒拉东部和前科迪勒拉弗洛ian(下奥陶统)牙形刺的多样性。对比分析仅限于前科迪勒拉的Oepikodus evae带(Juanognathus variabilis亚带)和东科迪勒拉的Gothodus andinus带相关区间的中弗洛纪阶段切片(Fl2)。为了进行比较分析，我们编制了牙形石数据的绝对频率表，这些数据来自已发表的文章和正在研究的文献。其中，前科迪勒拉4个剖面从碳酸盐岩圣胡安组中段采集了13个样品，东方科迪勒拉6个剖面从泥质阿科埃特组中上剖面采集了28个样品。利用PAST 4.03软件从绝对频率生成多样性模式和指数。参考流域的同代群落在物种丰富度和多样性方面存在显著差异。与其他盆地的对比表明，古纬度梯度不是控制生物多样性变化的主要因素，这可能是生物和物理化学因素复杂相互作用的结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Marine Micropaleontology 地学-古生物学

CiteScore

3.70

自引率

15.80%

发文量

审稿时长

26.7 weeks

期刊介绍： Marine Micropaleontology is an international journal publishing original, innovative and significant scientific papers in all fields related to marine microfossils, including ecology and paleoecology, biology and paleobiology, paleoceanography and paleoclimatology, environmental monitoring, taphonomy, evolution and molecular phylogeny. The journal strongly encourages the publication of articles in which marine microfossils and/or their chemical composition are used to solve fundamental geological, environmental and biological problems. However, it does not publish purely stratigraphic or taxonomic papers. In Marine Micropaleontology, a special section is dedicated to short papers on new methods and protocols using marine microfossils. We solicit special issues on hot topics in marine micropaleontology and review articles on timely subjects.