A new foraminiferal fauna from the Tangra Yumco area, central Lhasa Block, Tibet and its palaeobiogeographic implications

IF 1.7 3区 地球科学 Q2 PALEONTOLOGY
Qi Ju , Yi-Chun Zhang , Hai-Peng Xu , Hua Zhang , Quan-Feng Zheng , Mao Luo , Wen-Kun Qie , Jun-Jie Liu , Shu-Zhong Shen
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Abstract

A foraminiferal fauna, consisting of 8 species of fusulines and 24 species of smaller foraminifers, is reported from the middle part of the Xiala Formation in the Tangra Yumco section in central Lhasa Block. The dominance of fusuline Nankinella-Chusenella assemblage and smaller foraminifera Hemigordiopsis indicates a Capitanian (late Guadalupian) age. Quantitative methods including Cluster analysis (CA) and Non-metric Multidimensional Scaling (NMDS) are employed to explore the palaeobiogeographic relationship among the Lhasa, South Qiangtang, Baoshan and Tengchong blocks as well as the localities within these blocks, based on a compilation of Guadalupian fusulines from the four blocks. Results of CA and NMDS for the Guadalupian fusulines from twelve localities show that different localities in the Lhasa Block have a close palaeobiogeographic relationship, indicating a unified environment for the whole Lhasa Block during the Guadalupian. Results of CA and NMDS from four blocks show that the Lhasa and Tengchong blocks have a closer relationship in palaeobiogeographic characteristics, whereas the South Qiangtang and Baoshan blocks are relatively closer. All these results indicate that the Mesotethys Ocean might have opened to a considerable width, forming a palaeogeographic barrier to allow for the discrepancy of palaeobiogeographic characteristics between the Lhasa-Tengchong and the South Qiangtang-Baoshan blocks.

西藏拉萨地块中部丹格拉-尤姆科地区一个新的有孔虫区系及其古生物地理学意义
报告的有孔虫动物群来自拉萨地块中部唐拉音科段的夏拉地层中段,包括 8 种有孔虫和 24 种小型有孔虫。有孔虫Nankinella-Chusenella群和小型有孔虫Hemigordiopsis群的优势表明其时代为Capitanian(瓜达鲁派晚期)。根据四个区块的瓜达卢佩燧石,采用聚类分析(CA)和非计量多维尺度(NMDS)等定量方法探讨了拉萨、南羌塘、保山和腾冲区块以及这些区块内各地点之间的古生物地理关系。12个地点的瓜达卢佩燧石的CA和NMDS结果表明,拉萨地块内不同地点的古生物地理关系密切,表明整个拉萨地块在瓜达卢佩时期具有统一的环境。四个区块的CA和NMDS结果表明,拉萨区块和腾冲区块的古生物地理特征关系较为密切,而南羌塘区块和保山区块的古生物地理特征关系相对较近。所有这些结果表明,美索特提斯洋可能已经打开了相当大的宽度,形成了古地理屏障,从而使拉萨-腾冲和南羌塘-保山区块之间的古生物地理特征存在差异。
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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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