Radiolarians of the Kungurian Stage of the Lower Permian in the South Urals of Russia

IF 0.7 4区地球科学 Q4 PALEONTOLOGY

Paleontological Journal Pub Date : 2023-11-30 DOI:10.1134/s0031030123070018

M. S. Afanasieva

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Abstract

Kungurian radiolarians from the Lower Permian sections Alegazovo on the Ai River and Mechetlino on the Yuryuzan River on the western slope of the South Urals were studied. The distribution of 23 radiolarian species in the studied sections was analyzed, enabling the recognition of two new radiolarian ecozones: Astroentactinia mirifica of the Saraninian Regional Substage in the Neostreptognathodus pnevi conodont Zone and Alexialeks uralicus–Octatormentum permicum of the Irenian Regional Substage, corresponding to the Neostreptognathodus imperfectus conodont Zone. The ecozones are based on the quantitative ratio of high-ranking taxa (classes). The use of the method of correlation of taxa of higher rank at the class level as an indicator of changes in paleoenvironments shows the inversion of the taxonomic composition of radiolarian associations of new ecozones of the Saraninian and Irenian regional substages indicating a change in the radiolarian habitats due to the shallowing of the basin. The taxonomic compositions of the radiolarian associations of the basinal and shelf environment are shown to be different. Three new radiolarian species from the Kungurian Stage of the South Urals are described: Astroentactinia mirifica Afanasieva, sp. nov., Helioentactinia parvispina Afanasieva, sp. nov., and H. venusta Afanasieva, sp. nov.

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俄罗斯南乌拉尔地区下二叠统昆古里安阶段的放射虫

摘要研究了南乌拉尔西坡艾河上的阿列加佐夫剖面和于柳赞河上的梅切特利诺剖面下二叠统的昆古里放射虫。对研究剖面中23种放射虫的分布进行了分析，确定了2个新的放射虫生态区:neoliptognathodus pnevi牙形刺带Saraninian区域亚期的Astroentactinia mirifica和Irenian区域亚期的Alexialeks uralicus-Octatormentum permicum，与neoliptognathodus imperfectus牙形刺带对应。生态区是根据高阶分类群(类)的数量比例划分的。利用高阶分类群的对比方法作为古环境变化的指示指标，发现萨拉尼期和伊勒尼期区域亚阶段新生态带放射虫组合的分类组成倒置，表明盆地变浅导致放射虫栖息地发生变化。海盆环境和陆架环境放射虫群的分类组成不同。报道了南乌拉尔Kungurian期放射虫的3个新种:Astroentactinia mirifica Afanasieva, sp. nov.、Helioentactinia parvispina Afanasieva, sp. nov.和H. venusta Afanasieva, sp. nov.。

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来源期刊

Paleontological Journal 地学-古生物学

CiteScore

1.20

自引率

33.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Paleontological Journal (Paleontologicheskii zhurnal) is the principal Russian periodical in paleontology. The journal publishes original work on the anatomy, morphology, and taxonomy of fossil organisms, as well as their distribution, ecology, and origin. It also publishes studies on the evolution of organisms, ecosystems, and the biosphere and provides invaluable information on global biostratigraphy with an emphasis on Eastern Europe and Asia.