英国伦敦皇家霍洛威大学Bond, Andrew D.和Dickson, Alexander J.课题组，在研究三叠纪末大灭绝期间全球有限但严重的浅陆架硫化中取得新进展。这一研究成果发表在2023年11月27日出版的国际学术期刊《自然—地球科学》上。
课题组人员使用氧化还原敏感元素 Mo 的沉积富集和同位素组成，重建灭绝间隔期间全球—局部海洋氧化还原条件。δ98Mo 峰值表明，灭绝期间，全球硫化物海洋条件分布与现代海洋相似。同时，特提斯陆架沉积物记录了 δ98Mo 脉冲式正偏移，指示局部缺氧的硫化条件。课题组人员认为，在晚三叠纪，严重的海洋缺氧脉冲主要局限于边缘海洋环境，并在当时的浅海灭绝阶段发挥了重要作用。
研究结果强调，全球海洋生物多样性和生态系统稳定性容易受到地理上局部缺氧条件的影响。因此，人为海洋养分供应和气候作用力导致的当前海洋缺氧现象的扩大，可能对全球生物多样性和更广泛的生态系统稳定性产生重大影响。
据了解，地球历史上最严重的一次复杂海洋生物灭绝发生在三叠纪末期(约 2.014 亿万年前)。这次海洋灭绝是由大火成岩省火山活动引起的，并初步认为其与缺氧条件的蔓延有关。然而，跨越三叠纪末事件的全球范围内的缺氧条件模式并没有得到很好的约束。
附：英文原文
Title: Globally limited but severe shallow-shelf euxinia during the end-Triassic extinction
Author: Bond, Andrew D., Dickson, Alexander J., Ruhl, Micha, Bos, Remco, van de Schootbrugge, Bas
Issue&Volume: 2023-11-27
Abstract: One of the most severe extinctions of complex marine life in Earth’s history occurred at the end of the Triassic period (~201.4 million years ago). The marine extinction was initiated by large igneous province volcanism and has tentatively been linked to the spread of anoxic conditions. However, the global-scale pattern of anoxic conditions across the end-Triassic event is not well constrained. Here we use the sedimentary enrichment and isotopic composition of the redox-sensitive element molybdenum to reconstruct global–local marine redox conditions through the extinction interval. Peak δ98Mo values indicate that the global distribution of sulfidic marine conditions was similar to the modern ocean during the extinction interval. Meanwhile, Tethyan shelf sediments record pulsed, positive δ98Mo excursions indicative of locally oxygen-poor, sulfidic conditions. We suggest that pulses of severe marine de-oxygenation were restricted largely to marginal marine environments during the latest Triassic and played a substantial role in shallow-marine extinction phases at that time. Importantly, these results show that global marine biodiversity, and possibly ecosystem stability, were vulnerable to geographically localized anoxic conditions. Expanding present-day marine anoxia in response to anthropogenic marine nutrient supply and climate forcing may therefore have substantial consequences for global biodiversity and wider ecosystem stability.
DOI: 10.1038/s41561-023-01303-2
Source: https://www.nature.com/articles/s41561-023-01303-2