| Autor: |
Bos, Remco, Zheng, Wang, Lindström, Sofie, Sanei, Hamed, Waajen, Irene, Fendley, Isabel M., Mather, Tamsin A., Wang, Yang, Rohovec, Jan, Navrátil, Tomáš, Sluijs, Appy, van de Schootbrugge, Bas |
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| Zdroj: |
Nature Communications; 10/28/2024, Vol. 15 Issue 1, p1-12, 12p |
| Abstrakt: |
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. This study provides evidence for long-term effects of volcanic emissions of large quantities of gaseous mercury (Hg) and plant mutagenesis by recording high abundances of malformed fern spores across the Triassic-Jurassic boundary and Early Jurassic. [ABSTRACT FROM AUTHOR] |
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Complementary Index |
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