Age Constraints of the Guttulapollenites hannonicus –Cladaitina veteadensis Biozone in Argentina Reveal the First Record of Early Triassic (Olenekian) Palynofloras in Western Gondwana

IF 1.4 4区地球科学 Q3 PALEONTOLOGY

Palynology Pub Date : 2022-07-05 DOI:10.1080/01916122.2022.2097329

S. N. Césari, C. Limarino, Patricia L. Ciccioli, C. Wall

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引用次数: 2

Abstract

ABSTRACT The upper Palaeozoic basins of central-western Argentina include continuous fossiliferous successions spanning the Carboniferous-Permian interval. The palynostratigraphic biozones comprise Late Mississippian, Pennsylvanian and Cisuralian assemblages. Recently, new palynofloras of the La Veteada Formation were referred to the Lopingian (late Permian). However, they are characterized by spores and tetrads of Lundbladispora spp. and Densoisporites spp., pollen grains of Lunatisporites pellucidus, L. noviaulensis and Protohaploxypinus samoilovichii, and the alga Syndesmorion stellatum, that distinguish the post-Permian recovery floras worldwide. A new uranium-lead chemical abrasion-isotope dilution-thermal ionization mass spectrometry (U-Pb CA-ID-TIMS) age confirms the Olenekian age of this stratigraphic unit and allows the identification of the first Early Triassic palynofloras in this region of western Gondwana. Comparison and correlation with similar assemblages from the southern and northern hemispheres supports the Early Triassic turnover with an increase of lycopsid cavate spores associated with some diagnostic species of taeniate and non-taeniate bisaccate pollen.

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阿根廷汉氏Guttulapollenites hannonicus–Cladaitina veteadensis生物带的年龄限制揭示了冈瓦纳大陆西部早三叠纪（Olenekian）Palynofloras的首次记录

摘要阿根廷中西部的上古生代盆地包括横跨石炭-二叠纪的连续化石序列。坡缕岩生物带包括晚密西西比纪、宾夕法尼亚纪和西乌拉尔纪组合。近年来，拉Veteada组新的孢粉植物群被认为是洛平阶（晚二叠世）。然而，它们的特征是Lundbladispora spp.和Densoisporites spp.的孢子和四分体，Lunatisporites pellucidus、L.novaulensis和Protoploxypinus samoilovichii的花粉粒，以及藻类Syndesmorion stellatum，它们区分了世界各地的后二叠纪恢复区系。一个新的铀-铅化学磨蚀同位素稀释热电离质谱（U-Pb CA-ID-TIMS）年龄证实了该地层单元的奥列涅纪年龄，并允许识别冈瓦纳大陆西部该地区的第一个早三叠世孢粉植物群。与来自南半球和北半球的类似组合的比较和相关性支持了早三叠纪的更替，与一些带绦虫和非带绦虫双囊花粉的诊断物种相关的石松囊孢子增加。

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来源期刊

Palynology 地学-古生物学

CiteScore

3.40

自引率

26.70%

发文量

审稿时长

>12 weeks

期刊介绍： Palynology is an international journal, and covers all aspects of the science. We accept papers on both pre-Quaternary and Quaternary palynology and palaeobotany. Contributions on novel uses of palynology, review articles, book reviews, taxonomic studies and papers on methodology are all actively encouraged.