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Thallium isotope cycling in a ferruginous Precambrian ocean analogue

https://doi.org/10.1016/j.gca.2024.12.008

Ostrander, Chadlin M; Heard, Andy W; Swanner, Elizabeth D; Shu, Yunchao; Zheng, Wang; Zhao, Yaqiu; Nielsen, Sune G (February 2025, Geochimica et Cosmochimica Acta)

Free, publicly-accessible full text available February 1, 2026
Mercury isotope evidence for recurrent photic-zone euxinia triggered by enhanced terrestrial nutrient inputs during the Late Devonian mass extinction

https://doi.org/10.1016/j.epsl.2023.118175

Zheng, Wang; Gilleaudeau, Geoffrey J.; Algeo, Thomas J.; Zhao, Yaqiu; Song, Yi; Zhang, Yuanming; Sahoo, Swapan K.; Anbar, Ariel D.; Carmichael, Sarah K.; Xie, Shucheng; et al (July 2023, Earth and Planetary Science Letters)

Full Text Available
Mercury isotope evidence for marine photic zone euxinia across the end-Permian mass extinction

https://doi.org/10.1038/s43247-023-00821-6

Sun, Ruoyu; Liu, Yi; Sonke, Jeroen E.; Feifei, Zhang; Zhao, Yaqiu; Zhang, Yonggen; Chen, Jiubin; Liu, Cong-Qiang; Shen, Shuzhong; Anbar, Ariel D.; et al (May 2023, Communications Earth & Environment)

Abstract The driving forces, kill and recovery mechanisms for the end-Permian mass extinction (EPME), the largest Phanerozoic biological crisis, are under debate. Sedimentary records of mercury enrichment and mercury isotopes have suggested the impact of volcanism on the EPME, yet the causes of mercury enrichment and isotope variations remain controversial. Here, we model mercury isotope variations across the EPME to quantitatively assess the effects of volcanism, terrestrial erosion and photic zone euxinia (PZE, toxic, sulfide-rich conditions). Our numerical model shows that while large-scale volcanism remains the main driver of widespread mercury enrichment, the negative shifts of Δ¹⁹⁹Hg isotope signature across the EPME cannot be fully explained by volcanism or terrestrial erosion as proposed before, but require additional fractionation by marine mercury photoreduction under enhanced PZE conditions. Thus our model provides further evidence for widespread and prolonged PZE as a key kill mechanism for both the EPME and the impeded recovery afterward.
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