Towards Stage Subdivision of the Vendian

IF 1.2 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Russian Geology and Geophysics Pub Date : 2023-11-01 DOI:10.2113/rgg20234636

D.V. Grazhdankin, D.O. Aleksandrov, V.O. Maksimenko, V.I. Rogov

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引用次数: 1

Abstract

Abstract —The way towards the stage subdivision of the Vendian starts with the assemblage of a complete composite geological section of this interval of the Earth’s history, a succession of geological bodies each reflecting a certain ecosystem state. A Vendian composite section of the Siberian Platform, which is a succession of regional to sub-global scale geological bodies reflecting particular states or unidirectional transformations determined by episodic expansion of relatively oxygen-rich environments onto the shelf and alternating with large-scale oceanic anoxia and euxinia events is proposed as a reference for constructing the stage subdivision of the Vendian. The redox instability had to be accompanied by changes in nutrient availability and could not but affect the course of macroevolution and macroecology. The geological record of the Vendian of the Siberian Platform is also marked by episodic increase in alkalinity of the World Ocean. At least five such alkalinity events could be provisionally identified in the composite section of the Vendian of the Siberian Platform. A hypothesis is proposed suggesting that the alkalinity events could control the appearance and disappearance in the geological record of a distinctive suite of sedimentary structures in carbonates, the discrete nature of early diagenetic cementation of aluminosilicoclastic sediments, and fossilization of soft-bodied organisms in the Vendian.

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朝向文德纪的阶段细分

摘要:对文甸进行阶段细分的方法，始于对地球历史上这段时间的完整的复合地质剖面的组合，这是一系列地质体，每个地质体都反映了一定的生态系统状态。提出了西伯利亚地台的文甸复合剖面，该剖面是由区域到亚全球尺度的地质体序列，反映了相对富氧环境在陆架上的幕式扩张和大规模海洋缺氧和缺氧事件交替决定的特定状态或单向转变，可作为构建文甸阶段细分的参考。氧化还原不稳定性必须伴随着养分有效性的变化，并且必须影响宏观进化和宏观生态的进程。西伯利亚地台文甸的地质记录也以世界海洋碱度的阶段性增加为特征。至少有五个这样的碱度事件可以暂时确定在西伯利亚地台的文迪安的复合部分。提出了一种假设，认为碱度事件控制了碳酸盐岩中一套独特的沉积构造的出现和消失，控制了铝硅碎屑沉积早期成岩胶结的离散性，控制了文德纪软体生物的石化。

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来源期刊

Russian Geology and Geophysics 地学-地球科学综合

CiteScore

2.00

自引率

18.20%

发文量

审稿时长

4-8 weeks

期刊介绍： The journal publishes original reports of theoretical and methodological nature in the fields of geology, geophysics, and geochemistry, which contain data on composition and structure of the Earth''s crust and mantle, describes processes of formation and general regularities of commercial mineral occurrences, investigations on development and application of geological-geophysical methods for their revealing. As to works of regional nature, accelerated publication are available for original papers on a variety of problems of comparative geology taking into account specific character of Siberia, adjacent Asian countries and water areas. The journal will also publish reviews, critical articles, chronicle of the most important scientific events, and advertisements.