在晚寒武纪SPICE事件期间，浅海脱氧推动了三叶虫的更替，这一成果由中国科学院南京地质古生物所朱茂炎团队经过不懈努力而取得。相关论文发表在2024年6月17日出版的《地质学》杂志上。

本文综合分析了华北地台三叶虫的碳酸盐δ¹³C、铈异常(Ce/Ce*)和属级多样性数据。结果显示，SPICE、Ce/Ce*的增加和三叶虫更替事件之间存在紧密耦合的变化，研究人员将其解释为生产力和有机再矿化的增强，导致了浅水环境低氧条件的发展。

本研究在全球SPICE事件中建立了局部生态压力与三叶虫转换之间的直接联系。此外，SPICE事件高峰期出现低氧而非完全缺氧条件的存在可以解释Marjuman末期危机的性质，其特征是浅水动物被可能更耐受缺氧的深水动物所取代。

据悉，海洋缺氧的扩散被认为在晚寒武纪(约497.5m.y)的SPICE(Steptoean正碳同位素偏移)事件和Marjuman末期灭绝的发展中起了关键作用，但它们之间的因果关系很少受到限制。

附：英文原文

Title: Shallow ocean deoxygenation drove trilobite turnover during the late Cambrian SPICE event

Author: Aihua Yang, Bo Chen, Zhixin Sun, Rosalie Tostevin, Tianchen He, Xi Chen, Jitao Chen, Miao Lu, Chunlin Hu, Shengxian Du, Jun Chen, Wenjun Jiao, Maoyan Zhu

Issue&Volume: 2024-06-17

Abstract: The spread of marine anoxia is believed to have played a key role in the development of the SPICE (Steptoean Positive Carbon Isotope Excursion) event and the end-Marjuman extinction in the late Cambrian (～497.5 m.y. ago), but their cause-and-effect relationship is poorly constrained. Here we present an integrated analysis of carbonate δ¹³C, cerium anomalies (Ce/Ce*), and genus-level diversity data of trilobites from the North China Platform. Our results show tightly coupled changes between the SPICE, an increase in Ce/Ce*, and a trilobite turnover event, which we interpret as indicating enhanced productivity and organic remineralization, leading to the development of low-oxygen conditions in shallow-water settings. This study therefore establishes a direct link between local ecological stress and trilobite turnover during the global SPICE event. Furthermore, the presence of low-oxygen rather than fully anoxic conditions during the peak of the SPICE event could explain the nature of the end-Marjuman crisis, which was characterized by the replacement of shallow-water fauna by deeper-water counterparts that were potentially more tolerant of hypoxia.

DOI: 10.1130/G52200.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G52200.1/645003/Shallow-ocean-deoxygenation-drove-trilobiteredirectedFrom=fulltext