Coupling of shallow marine redox change and multi-stage animal radiations during the early Cambrian

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research Pub Date : 2025-01-04 DOI:10.1016/j.gr.2025.01.003

Yanhong Zheng , Chao Chang , Jiahao Li , Yi Ding , Xiaotong Tang , Jianni Liu

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Abstract

Marine redox variations are widely accepted as an environmental driver for the Cambrian explosion, yet relative changes in shallow marine dissolved oxygen levels during the Ediacaran–Cambrian transition have long remained unconstrained. Here we present compiled nitrogen and organic carbon isotope data from shallow-water deposits in four sections, including new record from the Meishucun and Zhujiaqing sections, on the Yangtze Platform. The results reveal that nitrogenous environments with active denitrification prevailed in shallow ocean during the Terreneuvian, which may have been sufficient only for ecological successes of lophotrochozoans with relatively low O₂ demands. In contrast, the diversification of ecdysozoans and deuterostomes with higher O₂ demands was possibly suppressed and delayed until a rise of dissolved oxygen concentrations during the Cambrian Age 3. Our findings provide crucial support for a causal link between marine oxygen availability and rapid diversification of metazoans during the Cambrian explosion.

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早寒武纪浅海氧化还原变化与多阶段动物辐射的耦合

海洋氧化还原变化被广泛认为是寒武纪大爆发的环境驱动因素，但在埃迪卡拉纪-寒武纪过渡期间，浅海溶解氧水平的相对变化一直没有得到限制。本文整理了扬子地台4个剖面的浅水沉积氮、有机碳同位素资料，其中包括梅树村剖面和朱家庆剖面的新记录。结果表明，Terreneuvian时期浅海中普遍存在积极反硝化的氮环境，这可能仅足以满足相对低氧需要量的浮游动物的生态成功。相比之下，高氧需要量的外生动物和后口动物的多样化可能被抑制和延迟，直到寒武纪第3期溶解氧浓度上升。我们的发现为寒武纪大爆发期间海洋氧气供应与后生动物快速多样化之间的因果关系提供了重要支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Gondwana Research 地学-地球科学综合

CiteScore

12.90

自引率

6.60%

发文量

298

审稿时长

65 days

期刊介绍： Gondwana Research (GR) is an International Journal aimed to promote high quality research publications on all topics related to solid Earth, particularly with reference to the origin and evolution of continents, continental assemblies and their resources. GR is an "all earth science" journal with no restrictions on geological time, terrane or theme and covers a wide spectrum of topics in geosciences such as geology, geomorphology, palaeontology, structure, petrology, geochemistry, stable isotopes, geochronology, economic geology, exploration geology, engineering geology, geophysics, and environmental geology among other themes, and provides an appropriate forum to integrate studies from different disciplines and different terrains. In addition to regular articles and thematic issues, the journal invites high profile state-of-the-art reviews on thrust area topics for its column, ''GR FOCUS''. Focus articles include short biographies and photographs of the authors. Short articles (within ten printed pages) for rapid publication reporting important discoveries or innovative models of global interest will be considered under the category ''GR LETTERS''.