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Paleoenvironmental analysis of Ernietta-bearing Ediacaran deposits in southern Namibia
Palaeogeography, Palaeoclimatology, Palaeoecology ( IF 3 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.palaeo.2020.109884
Katie M. Maloney , Thomas H. Boag , Amanda J. Facciol , Brandt M. Gibson , Alison Cribb , Bryce E. Koester , Charlotte G. Kenchington , Rachel A. Racicot , Simon A.F. Darroch , Marc Laflamme

Abstract Ediacaran fossils from the Nama Group (Kuibis Subgroup) of southern Namibia have a long history of scientific scrutiny, however many of the fossil localities still require investigation from a sedimentary facies and sequence stratigraphic standpoint. Detailed sedimentary analyses utilizing chemostratigraphy and facies-based approaches resulted in five proposed facies and two paleoenvironmental settings that allow for interpretation of the fossiliferous sections as a nearshore to a protected shallow marine paleoenvironment. The classic Ediacaran taxon Ernietta was restricted to the Kliphoek Member of the Nama Group, which limits the stratigraphic range of these organisms to the younger depositional sequence of the Kuibis Subgroup. The paleoenvironment has been interpreted as a mixed carbonate-siliciclastic, protected shallow marine environment at Farm Hansburg, suggesting that these organisms thrived in environments with medium to high flow velocities and periodic clastic sediment supply. Studies that utilize detailed paleoenvironmental reconstructions may aid in constraining phylogenetic affinities of the Ediacara biota by placing reasonable bounds on the local habitat.

中文翻译:

纳米比亚南部含 Ernietta 埃迪卡拉纪沉积物的古环境分析

摘要 纳米比亚南部纳马群(Kuibis 亚群)埃迪卡拉纪化石有着悠久的科学考察历史,但仍有许多化石产地需要从沉积相和层序地层学的角度进行研究。利用化学地层学和基于相的方法进行详细的沉积分析,得出了五个提议的相和两个古环境环境,可以将含化石部分解释为受保护的浅海海洋古环境的近岸。经典的埃迪卡拉纪分类单元 Ernietta 仅限于 Nama 群的 Kliphoek 成员,这将这些生物的地层范围限制在 Kuibis 亚群的较年轻的沉积序列中。古环境被解释为混合碳酸盐-硅质碎屑,在汉斯堡农场受保护的浅海海洋环境,表明这些生物在中高流速和周期性碎屑沉积物供应的环境中繁衍生息。利用详细的古环境重建的研究可能有助于通过对当地栖息地设置合理的界限来限制埃迪卡拉生物群的系统发育亲缘关系。
更新日期:2020-10-01
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