Global correlation of the Guadalupian–Lopingian transition and associated events using a quantitative conodont-based biostratigraphic scheme

IF 2.6 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL
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Abstract

The Guadalupian–Lopingian boundary (GLB) interval contains global-scale changes in biota and environment. The establishment of a uniform time scale and a robust system of global correlation are critical in order to unravel the tempo of these events. Conodonts are key biostratigraphic tools; however, major discrepancies exist in conodont taxonomy and correlation in this interval. In this paper, we compile conodont data from 17 well-studied sections in South China, Japan, Oman and North America, comprising 206 occurrences and 100 species, based on previous publications and our own revisions, to test the reproducibility and correlation value of formerly established interval zones. The Unitary Association method (UAM), a quantitative stratigraphic method for the construction of biozones, is applied to construct a robust conodont biozonation for the GLB. Eleven unitary associations (UAs) and eight unitary association zones (UAZs) are recognized to establish biozones and the GLB was constrained within the UAZ5. According to the reproducibility of these UAZs, the correlation of the Lopingian is generally better than the Guadalupian. Apparent contradictions revealed by the UAZs suggest that biostratigraphic and/or taxonomic issues are present within the Clarkina liangshanensis, C. leveni, C. transcaucasica interval zones. The interval between UAZ4 and UAZ5 records the conodont turnover event from Jinogondolella to Clarkina in the paleoequatorial region. Our results suggest that the UAZs are more reliable for correlation. By contrast, some taxonomic and phylogenetic issues are present in the interval zones based on the conodont succession around the GLB. Although at a coarser stratigraphic resolution, removing all the contradictions enables UAZs to better correlate global sections compared with interval zones. The newly established UAZs indicate that the previously reported isotope excursions around the GLB in different regions may be temporally inconsistent.

利用基于锥齿类生物地层学的定量方案,对瓜岛期-珞巴期过渡及相关事件进行全球相关性研究
瓜达卢佩-罗平边界(GLB)区间包含生物群和环境的全球尺度变化。建立统一的时间尺度和强大的全球相关系统对于揭示这些事件的发生节奏至关重要。锥齿轮虫是关键的生物地层学工具;然而,在这一时期的锥齿轮虫分类和相关性方面存在重大差异。在本文中,我们根据以往的出版物和自己的修订,汇编了来自华南、日本、阿曼和北美的 17 个研究良好的剖面的锥齿动物数据,包括 206 个地点和 100 个物种,以检验以前建立的区间带的重现性和相关性价值。单元关联法(UAM)是一种用于构建生物区带的定量地层学方法,该方法被用于为大洋洲谷地构建一个稳健的锥齿类生物区带。共确认了 11 个单元关联(UAs)和 8 个单元关联区(UAZ)以建立生物区,并将 GLB 限制在 UAZ5 内。根据这些单元关联区的重现性,罗平期的相关性总体上优于瓜达卢佩期。UAZs揭示的明显矛盾表明,Clarkina liangshanensis、C. leveni、C. transcaucasica间区存在生物地层学和/或分类学问题。UAZ4和UAZ5之间的区间记录了古赤道地区从Jinogondolella到Clarkina的锥齿动物更替事件。我们的研究结果表明,UAZs 的相关性更为可靠。相比之下,以 GLB 附近的锥齿类演替为基础的区带在分类学和系统发育方面存在一些问题。虽然地层分辨率较低,但消除所有矛盾后,UAZ 与间隔带相比,能更好地关联全球断面。新建立的 UAZs 表明,以前报告的不同地区 GLB 周围的同位素偏移可能在时间上不一致。
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来源期刊
CiteScore
5.90
自引率
10.00%
发文量
398
审稿时长
3.8 months
期刊介绍: Palaeogeography, Palaeoclimatology, Palaeoecology is an international medium for the publication of high quality and multidisciplinary, original studies and comprehensive reviews in the field of palaeo-environmental geology. The journal aims at bringing together data with global implications from research in the many different disciplines involved in palaeo-environmental investigations. By cutting across the boundaries of established sciences, it provides an interdisciplinary forum where issues of general interest can be discussed.
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