西藏中部仙扎地区下泥盆世牙形刺与中国下泥盆世阶段界线

IF 1.7 3区 地球科学 Q2 PALEONTOLOGY Palaeoworld Pub Date : 2024-06-01 DOI:10.1016/j.palwor.2022.12.003
Wen Guo , Jun-Jun Song , Jian-Feng Lu , Jia-Yuan Huang , Yu-Jue Wang , Yi-Chun Zhang , Wen-Kun Qie
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引用次数: 0

摘要

我们报告了拉萨地块夏扎地区达东地层的锥齿动物组合,首次在拉萨地块发现了几个具有重要年代地层学意义的锥齿动物元素,包括Gondwania profunda、Polygnathus pannonicus、P. kitabicus、P. cf. sokolovi和P. excavatus excavatus。确定了两个锥齿动物区,即中普拉亚深渊区和下埃米西亚出土区。据推测,普拉格期与埃姆西亚期的分界线位于生物碎屑灰岩第 4 和第 6 层与粉砂岩夹层之间的区间。虽然本研究中的锥齿轮虫数量稀少,无法进行更精确的年代地层划分,但拉萨地块的仙扎地区对于识别中国下泥盆统的阶段界线具有重要的潜在意义,值得进一步的锥齿轮虫研究。
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Lower Devonian conodonts from the Xainza area, central Tibet and the Lower Devonian stage boundaries in China

We report conodont assemblages from the Dardong Formation of the Xainza area, Lhasa Block, yielding several chronostratigraphically significant conodont elements discovered from the Lhasa Block for the first time, including Gondwania profunda, Polygnathus pannonicus, P. kitabicus, P. cf. sokolovi and P. excavatus excavatus. Two conodont zones are identified, namely, the middle Pragian profunda Zone and the lower Emsian excavatus Zone. The Pragian–Emsian boundary is presumably located within the interval between bioclastic limestone beds 4 and 6 with an interbed of siltstones. Although the sparse conodont occurrences in this study precludes more precise chronostratigraphic subdivision, the Xainza area of the Lhasa Block is potentially important for recognition of Lower Devonian stage boundaries in China and deserves further conodont investigations.

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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
期刊最新文献
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