基于精确U-Pb年龄约束的早三叠世巢湖动物群测年：中生代海洋爬行动物出现和首次辐射的时间定标

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Palaeoworld Pub Date : 2025-05-26 DOI:10.1016/j.palwor.2025.200963

Yi-Nuo Wang , Da-Yong Jiang , Ryosuke Motani , Ming-Tao Yao , Min Zhou , Zuo-Yu Sun , Jian-Dong Huang , Zhao-Liang Ma

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引用次数: 0

摘要

中生代海生爬行动物的出现时间由于地层控制不佳和缺乏放射性年龄约束一直存在争议。通过LA-ICP-MS分析，我们获得了248.7±1.0 Ma （2σ）的放射性年龄，这些锆石颗粒来自于位于巢湖动物群化石层中，并在最低化石层之上约7 m处的凝灰岩。这证实了巢湖动物群是世界上已知最古老的海洋爬行动物群，具有精确和全面的年龄限制。结合生物地层资料和天体年代学分析，我们的研究结果表明，海洋爬行动物至少在二叠纪-三叠纪界线后320万年建立。

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Dating of Early Triassic Chaohu Fauna by precise U-Pb age constraints: Temporal calibration of the emergence and first radiation of Mesozoic marine reptiles

The emergence time of Mesozoic marine reptiles has been controversial due to poor stratigraphic control and the lack of radiometric age constraints. We report a radiometric age of 248.7 ± 1.0 Ma (2σ), obtained through LA-ICP-MS analysis of the zircon grains sampled from a tuff which is intercalated within the fossiliferous beds of the Chaohu Fauna and layered about 7 m above the lowest fossiliferous bed. This dating confirms the Chaohu Fauna as the oldest known marine reptile fauna in the world with precise and comprehensive age constraints. Integrated with the biostratigraphic data and astrochronological analysis, our results demonstrate that marine reptiles were established at least by 3.2 million years after the Permian–Triassic boundary.

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来源期刊

Palaeoworld PALEONTOLOGY-

CiteScore

4.00

自引率

5.90%

发文量

期刊介绍： Palaeoworld is a peer-reviewed quarterly journal dedicated to the study of past life and its environment. We encourage submission of original manuscripts on all aspects of palaeontology and stratigraphy, comparisons of regional and global data in time and space, and results generated by interdisciplinary investigations in related fields. Some issues will be devoted entirely to a special theme whereas others will be composed of contributed articles. Palaeoworld is dedicated to serving a broad spectrum of geoscientists and palaeobiologists as well as serving as a resource for students in fields as diverse as palaeobiology, evolutionary biology, taxonomy and phylogeny, geobiology, historical geology, and palaeoenvironment. Palaeoworld publishes original articles in the following areas: •Phylogeny and taxonomic studies of all fossil groups •Biostratigraphy, chemostratigraphy, chronostratigraphy •Palaeoecology, palaeoenvironment and global changes throughout Earth history •Tempo and mode of biological evolution •Biological events in Earth history (e.g., extinctions, radiations) •Ecosystem evolution •Geobiology and molecular palaeobiology •Palaeontological and stratigraphic methods •Interdisciplinary studies focusing on fossils and strata