New palynological data and U–Pb dating from the Jiufotang Formation: Implications for the late Jehol Biota

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology Pub Date : 2024-12-12 DOI:10.1016/j.revpalbo.2024.105270

Qiaoer Ying , Shouliang Sun , Duojia Zhang , Fei Liang , Yuhui Feng , Guodong Wang , Shiying Wang , Eugenia Bugdaeva , Valentina Markevich , Mihai Emilian Popa

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引用次数: 0

Abstract

The Lower Cretaceous terrestrial strata of northeast China are predominantly located in northern Hebei, western Liaoning, Jilin, and eastern Inner Mongolia Provinces. Among these, the Jiufotang Formation in western Liaoning has garnered significant global attention due to its rich fossil record, particularly in relation to Jehol Biota. The age of the Jiufotang Formation has long been debated primarily due to the absence of biostratigraphic fossil evidence. In this study, we analyzed the palynological content collected from the Jiufotang Formation in the Pijiagou section of the Fuxin Basin. A total of 41 species in 24 palynomorph genera were recognized as belonging to the Appendicisporites-Pinuspollenites-Jiaohepollis assemblage. We documented the new occurrence of Appendicisporites imperfectus in the Jiufotang Formation, which has been recognized as a valid biostratigraphic indicator for Aptian palynological assemblages, thereby providing crucial new palynological evidence for dating this formation. Furthermore, LA-ICP-MS zircon U–Pb dating for a rhyolitic tuff yielded a new age of 118.07 ± 0.98 Ma, suggesting that the Pijiagou section was dated to the middle Aptian. Based on the palynological data, the Lower Cretaceous Jiufotang flora was represented by coniferous forests. Considering the associated biota, the palaeoenvironment during the middle Aptian was characterized by a sub-humid warm temperate climate with seasonal changes.

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九佛堂组孢粉新资料及U-Pb定年：对热河晚期生物群的启示

东北地区下白垩统陆相地层主要分布在河北北部、辽宁西部、吉林和内蒙古东部。其中，辽西九佛堂组因其丰富的化石记录，特别是与热河生物群有关的化石记录，引起了全球的广泛关注。长期以来，由于缺乏生物地层化石证据，九佛堂组的年龄一直存在争议。本文对阜新盆地皮家沟剖面九佛塘组孢粉含量进行了分析。经鉴定，该属共24属41种，属Appendicisporites-Pinuspollenites-Jiaohepollis组合。我们在九佛塘组发现了新的Appendicisporites imperfectus，这是一个有效的阿普田孢粉组合的生物地层指示物，从而为该组的定年提供了重要的孢粉学新证据。此外，LA-ICP-MS锆石U-Pb定年结果显示，该流纹岩凝灰岩的新时代为118.07±0.98 Ma，表明皮家沟剖面属于阿普tian中期。孢粉学资料表明，下白垩统九佛堂区系以针叶林为代表。从相关生物群来看，阿普tian中期的古环境具有半湿润的暖温带气候特征，并伴有季节变化。

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来源期刊

Review of Palaeobotany and Palynology 地学-古生物学

CiteScore

3.50

自引率

21.10%

发文量

149

审稿时长

6 months

期刊介绍： The Review of Palaeobotany and Palynology is an international journal for articles in all fields of palaeobotany and palynology dealing with all groups, ranging from marine palynomorphs to higher land plants. Original contributions and comprehensive review papers should appeal to an international audience. Typical topics include but are not restricted to systematics, evolution, palaeobiology, palaeoecology, biostratigraphy, biochronology, palaeoclimatology, paleogeography, taphonomy, palaeoenvironmental reconstructions, vegetation history, and practical applications of palaeobotany and palynology, e.g. in coal and petroleum geology and archaeology. The journal especially encourages the publication of articles in which palaeobotany and palynology are applied for solving fundamental geological and biological problems as well as innovative and interdisciplinary approaches.