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  • Title: Climate-forced Hg-remobilization associated with fern mutagenesis in the aftermath of the end-Triassic extinction.
    Author: Bos R, Zheng W, Lindström S, Sanei H, Waajen I, Fendley IM, Mather TA, Wang Y, Rohovec J, Navrátil T, Sluijs A, van de Schootbrugge B.
    Journal: Nat Commun; 2024 Apr 27; 15(1):3596. PubMed ID: 38678037.
    Abstract:
    The long-term effects of the Central Atlantic Magmatic Province, a large igneous province connected to the end-Triassic mass-extinction (201.5 Ma), remain largely elusive. Here, we document the persistence of volcanic-induced mercury (Hg) pollution and its effects on the biosphere for ~1.3 million years after the extinction event. In sediments recovered in Germany (Schandelah-1 core), we record not only high abundances of malformed fern spores at the Triassic-Jurassic boundary, but also during the lower Jurassic Hettangian, indicating repeated vegetation disturbance and stress that was eccentricity-forced. Crucially, these abundances correspond to increases in sedimentary Hg-concentrations. Hg-isotope ratios (δ202Hg, Δ199Hg) suggest a volcanic source of Hg-enrichment at the Triassic-Jurassic boundary but a terrestrial source for the early Jurassic peaks. We conclude that volcanically injected Hg across the extinction was repeatedly remobilized from coastal wetlands and hinterland areas during eccentricity-forced phases of severe hydrological upheaval and erosion, focusing Hg-pollution in the Central European Basin.
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