First record of the latest Devonian ostracods from Xainza region, Tibet, China: implications on palaeoenvironment and palaeobiogeography

IF 1.7 3区 地球科学 Q2 PALEONTOLOGY
Jun-Jun Song , Wen Guo , Yu-Cong Sun , Juan Ma , Jia-Yuan Huang , Yi-Chun Zhang , Wen-Kun Qie
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Abstract

Ostracods of the Devonian–Carboniferous transitional interval in the Lhasa Block are described for the first time at the stratotype section of the Chaguoluoma Formation, Xainza, Tibet. Fifty-three ostracod species of 19 genera are identified and figured including a new species Bairdiacypris xainzaensis n. sp. The ostracod fauna in the Chaguoluoma section may represent an age close to the Devonian–Carboniferous boundary. The benthic ostracods from the Chaguoluoma section belong to the Podocopid association (i.e., Eifelian Mega-Assemblage), which implies an offshore environment. Additionally, ostracods from the Chaguoluoma Formation show a high similarity to the Devonian taxa from South China, suggesting a close biogeographic affinity between the Lhasa Block and South China Plate. They are also compared to the ostracod faunas from Laurentia–Baltica, Gondwana, and Kazakhstan plates, which implies that ostracods could probably benefit from oceanic circulations and sea-level changes to experience faunal exchanges between peri-Gondwana and Laurentia–Baltica during the latest Devonian.

西藏仙札地区泥盆世介形类首次记录:古环境和古生物地理意义
首次描述了拉萨地块泥盆纪-石炭纪过渡带地层中的梭形纲动物。研究鉴定并绘制了19属53种介孔动物的图谱,其中包括一个新种Bairdiacypris xainzaensis n. sp.。Chaguoluoma 断面的底栖桡足类属于 Podocopid 群(即 Eifelian Mega-Assemblage),这意味着这里是一个近海环境。此外,恰果洛玛地层中的梭口类动物与华南泥盆纪类群具有很高的相似性,这表明拉萨地块与华南板块之间具有密切的生物地理亲缘关系。它们还与来自劳伦提亚-波罗的海板块、冈瓦纳板块和哈萨克斯坦板块的浮游动物群进行了比较,这意味着浮游动物可能得益于大洋环流和海平面的变化,经历了近冈瓦纳板块和劳伦提亚-波罗的海板块在晚泥盆世的动物交流。
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来源期刊
Palaeoworld
Palaeoworld PALEONTOLOGY-
CiteScore
4.00
自引率
5.90%
发文量
95
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
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