阿曼珊瑚礁形成记录中扩展的Smithian-Spathian(下三叠统)边界:牙形石分类、高分辨率生物年代学和碳同位素记录的意义

IF 2.3 2区 地球科学 Q1 PALEONTOLOGY
Marc Leu, H. Bucher, A. Baud, T. Vennemann, Zoneibe Luz, M. Hautmann, N. Goudemand
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引用次数: 0

摘要

在二叠纪-三叠纪边界大灭绝后约2.7万年,在一次气候变冷期间,nekton(菊石和牙形刺)的逐步灭绝结束于smith - spathian边界(SSB)。来自大陆架的SSB记录通常受到不整合的影响,表明冰川-上升起源的强迫回归。在这里,我们记录了Jebel Aweri (Batain平原,阿曼)的一个新的30米厚的SSB剖面,它提供了一个非常完整和扩展的记录,保存在一个奇异的区块中。这一区域大部分是由微生物结合岩和后生动物生物碎屑组成的,这些生物碎屑形成于近海海山的浅水中。在Wadi Musjah(阿曼Hawasina推覆体),另一个奇特的区块记录了以Hallstatt型相为代表的深水环境中的SSB。这两部分提供了一个独特的视角来研究早期斯巴达时期牙形刺的快速再多样化。他们导致了围绕SSB的牙形石分类的彻底修订,并在特提斯这一时间间隔建立了最高分辨率的生物年代学方案。来自阿曼的五个SSB剖面代表了海上海山和下斜坡矿床,被纳入了高分辨率定量单一关联(UA)分析。将得到的8个牙形石生物带与含氨带和碳酸盐碳同位素记录进行了相互校正,最终将SSB置于UAZ3和UAZ4之间的分离区间。只有平顶山Novispathodus pingdingshanensis与icriospthodus crassatus的关联才能明确地表征spathia的基部。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An expanded Smithian–Spathian (Lower Triassic) boundary from a reefal build‐up record in Oman: implications for conodont taxonomy, high‐resolution biochronology and the carbon isotope record
Some 2.7 myr after the Permian–Triassic boundary mass extinction, a stepwise extinction of the nekton (ammonoids and conodonts) ended at the Smithian–Spathian boundary (SSB) during an episode of climate cooling. SSB records from continental shelves are usually affected by an unconformity, suggesting a forced regression of glacio‐eustatic origin. Here, we document a new 30‐m‐thick SSB section from Jebel Aweri (Batain Plain, Oman) that provides an exceptionally complete and expanded record preserved in an exotic block. Most of this SSB section consists of microbial boundstone build‐ups with a framework of metazoan bioclasts that formed in shallow water on an offshore seamount. In Wadi Musjah (Hawasina nappes, Oman), another exotic block records the SSB in a deeper water setting represented by Hallstatt‐type facies. These two sections provide a unique perspective on the early Spathian rapid re‐diversification of conodonts. They led to a thorough revision of conodont taxonomy around the SSB and to the construction of the highest resolution biochronological scheme for this time interval in the Tethys. A total of five SSB sections from Oman representing both offshore seamounts and lower slope deposits were included in a high‐resolution, quantitative unitary associations (UA) analysis. The resulting 8 conodont biozones are intercalibrated with ammonoid zones and with the carbonate carbon isotope record ultimately placing the SSB in the interval of separation between UAZ3 and UAZ4. Only the association of Novispathodus pingdingshanensis with Icriospathodus crassatus can be used to unambiguously characterize the base of the Spathian.
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来源期刊
Papers in Palaeontology
Papers in Palaeontology PALEONTOLOGY-
CiteScore
4.50
自引率
4.30%
发文量
55
期刊介绍: Papers in Palaeontology is the successor to Special Papers in Palaeontology and a journal of the Palaeontological Association (www.palass.org). The journal is devoted to the publication of papers that document the diversity of past life and its distribution in time and space. Papers in Palaeontology is devoted to the publication of papers that document the diversity of past life and its distribution in time and space. As a sister publication to Palaeontology its focus is on descriptive research, including the descriptions of new taxa, systematic revisions of higher taxa, detailed biostratigraphical and biogeographical documentation, and descriptions of floras and faunas from specific localities or regions. Most contributions are expected to be less than 30 pp long but longer contributions will be considered if the material merits it, including single topic parts. The journal publishes a wide variety of papers on palaeontological topics covering: palaeozoology, palaeobotany, systematic studies, palaeoecology, micropalaeontology, palaeobiogeography, functional morphology, stratigraphy, taxonomy, taphonomy, palaeoenvironmental reconstruction, palaeoclimate analysis, biomineralization studies.
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