北高加索(俄罗斯联邦西南部)中下侏罗统过渡的孢粉学,用指数菊石校正

IF 0.7 Q4 PALEONTOLOGY
Аnna A. Goryacheva , Vasily V. Mitta , James B. Riding
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引用次数: 0

摘要

首次报道了俄罗斯联邦西南部北高加索地区库班河流域Karachay-Cherkessia的toarian和Aalenian Djigiat组的巨形岩。根据其生物地层成分,对5个样品进行了研究,以记录孢粉组合。4个样品(1、2、3、4)采集自具有关键指标的菊石标本,样品5为菱铁矿凝块中的菊石壳碎片。其中3个样品(4、2和1)产生了相对丰富和多样化的水生微型浮游生物(针叶虫、鞭毛藻囊、prasinophytes和zygnematalean藻类)和陆生孢子类(花粉和孢子);其余2个样品(3和5)产量较低,含有少于50个芽孢样。鞭毛藻组合的研究提供了特征和关键信息。这些是最上层的托瓦纪Nannoceratopsis组合和最上层的托瓦纪到最下层的Aalenian Parvocysta Suite组合。前者以纳米角藻(Nannoceratopsis)为主,Parvocysta类群数量稀少,后者则产生了更为多样和常见的Parvocysta及其近缘种标本。这与Parvocysta套件在托瓦西亚时期从北方王国进一步向南迁移到劳亚西亚的假设是一致的。某些鞭毛囊肿如半abulatum Mancodinium和sciniocassis spp.,这些是欧洲和大月桂地区的典型。花粉和孢子的组成比较单一,不能再细分。然而,一般来说,孢子和花粉组合的组成与托阿尔纪-阿勒纪过渡相一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The palynology of the Lower-Middle Jurassic transition of the North Caucasus (southwest Russian Federation), calibrated with index ammonites

Palynomorphs from the Toarcian and Aalenian Djigiat Formation of Karachay-Cherkessia in the Kuban River Basin (North Caucasus, southwest Russian Federation) are reported for the first time. Five samples carefully selected for their biostratigraphical content were studied to document the palynological assemblages. Four samples (1, 2, 3, 4) were collected from pieces of rock with key index ammonite specimens, and sample 5 comprises fragments of ammonite shells from a sideritic concretion. Three of these samples (4, 2 and 1) yielded relatively abundant and diverse aquatic microplankton (acritarchs, dinoflagellate cysts, prasinophytes and zygnematalean algae) and terrestrial palynomorphs (pollen and spores); the remaining two samples (3 and 5) were less productive and contained fewer than 50 palynomorph specimens. The study of the dinoflagellate assemblages provided characteristic and key information. These are the uppermost Toarcian Nannoceratopsis Assemblage and the uppermost Toarcian to lowermost Aalenian Parvocysta Suite Assemblage. The former is overwhelmingly dominated by Nannoceratopsis with sparse numbers of the Parvocysta suite, and the latter yielded more diverse and common specimens of Parvocysta and its relatives. This is consistent with the hypothesis that the Parvocysta suite migrated from the Boreal Realm further south into Laurasia during the Toarcian. Certain dinoflagellate cysts such as Mancodinium semitabulatum and Scriniocassis spp., which are typical of Europe and much of Greater Laurasia are absent. Composition of the pollen and spores proved relatively out to be monotonous, and cannot be subdivided. However, in general, the composition of the assemblages of spores and pollen is consistent with the Toarcian–Aalenian transition.

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来源期刊
CiteScore
2.50
自引率
0.00%
发文量
17
期刊介绍: La Revue de micropaléontologie publie 4 fois par an des articles de intérêt international, consacrés à tous les aspects de la micropaléontologie. Les textes, en anglais ou en français, sont des articles originaux, des résultats de recherche, des synthèses et mises au point, des comptes rendus de réunions scientifiques et des analyses de ouvrages. La revue se veut résolument ouverte à tous les aspects de la micropaléontologie en accueillant des travaux traitant de la systématique des microfossiles (et de leurs équivalents actuels), des bactéries aux microrestes de vertébrés, et de toutes leurs applications en sciences biologiques et géologiques.
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