近日，中国地质大学（武汉）谢树成团队报道了在泥盆纪晚期的大灭绝中，生产力的提高推动了海洋生物的灭绝。相关论文于2026年1月14日发表在《地质学》杂志上。

晚泥盆世生物危机期间海洋缺氧与生产力变化的关系尚不明确。

研究组通过美国田纳西州杜邦GHS钻孔中富硫化氢的上泥盆统查塔努加页岩锌同位素（δ⁶⁶Zn）数据，揭示了晚泥盆世海水的锌同位素组成特征。从弗拉斯阶下部到法门阶上部，δ⁶⁶Zn值逐渐升高，表明海洋生产力呈渐进式增长。该变化与氧化还原指标（U_EF、Mo_EF、C_org/P；│r│> 0.88；p < 0.001；EF为富集因子）的强相关性表明，生产力提升是同期海洋硫化缺氧加剧及生态压力增大的关键诱因。

生物标志物数据显示陆源高等植物有机质输入持续增加，与海水锌同位素变化趋势高度吻合（r = +0.73；p < 0.005）。这些证据共同表明，伴随陆生高等植物扩张而增强的陆源磷通量是驱动观测到δ⁶⁶Zn模式的主要因素（r = +0.88，均方根误差=0.11‰）。该研究揭示了海洋初级生产力上升在触发晚泥盆世生态危机（如达斯伯格事件）中的潜在作用，为理解现代海岸缺氧带扩张提供了警示性类比。

附：英文原文

Title: Rising productivity drove marine euxinia during the Late Devonian mass extinctions

Author: Zhiguo Li, Ruoyuan Qiu, Thomas J. Algeo, Mingyu Zhao, Ting Chen, Yi Song, Geoffrey J. Gilleaudeau, Yefang Xing, Fang Huang, Genming Luo, Shucheng Xie

Issue&Volume: 2026-01-14

Abstract: The relationship of oceanic anoxia to changes in marine productivity during the biocrises of the Late Devonian remains uncertain. We present zinc isotope (δ66Zn) data from the euxinic Upper Devonian Chattanooga Shale in the Dupont GHS core (Tennessee, USA), reflecting the Zn isotopic composition of Late Devonian seawater. From the lower Frasnian to the upper Famennian, δ66Zn values gradually increase, indicating a progressive rise in marine productivity. Strong correlations of this shift with redox proxies (UEF, MoEF, Corg/P; │r│ > 0.88; p <0.001; EF—enrichment factor) suggest that increased productivity was a key cause of contemporaneous marine euxinia and heightened ecological stress. Biomarker data record increasing inputs of terrestrial organic matter from higher plants, closely paralleling the shift in seawater Zn isotopes (r = +0.73; p < 0.005). These collectively suggest that the enhanced terrestrial phosphorus flux associated with the expansion of terrestrial higher plants was the primary driver for the observed δ66Zn patterns (r = +0.88, root mean square error = 0.11‰). Our study highlights the potential role of rising marine primary productivity in triggering Late Devonian ecological crises (e.g., the Dasberg Event), providing a cautionary parallel to the expansion of modern coastal dead zones.

DOI: 10.1130/G54182.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G54182.1/724422/Rising-productivity-drove-marine-euxinia-duringredirectedFrom=fulltext