Permo-Triassic boundary carbon and mercury cycling linked to terrestrial ecosystem collapse.

Dal Corso, Jacopo; Mills, Benjamin J W; Chu, Daoliang; Newton, Robert J; Mather, Tamsin A; Shu, Wenchao; Wu, Yuyang; Tong, Jinnan; Wignall, Paul B

Dal Corso, Jacopo; Mills, Benjamin J W; Chu, Daoliang; Newton, Robert J; Mather, Tamsin A; Shu, Wenchao; Wu, Yuyang; Tong, Jinnan; Wignall, Paul B.

Afiliación

Dal Corso J; School of Earth and Environments, University of Leeds, Leeds, LS2 9JT, UK. J.DalCorso@leeds.ac.uk.
Mills BJW; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, China. J.DalCorso@leeds.ac.uk.
Chu D; School of Earth and Environments, University of Leeds, Leeds, LS2 9JT, UK. b.mills@leeds.ac.uk.
Newton RJ; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, China.
Mather TA; School of Earth and Environments, University of Leeds, Leeds, LS2 9JT, UK.
Shu W; Department of Earth Sciences, University of Oxford, South Parks Road, Oxford, OX1 3AN, UK.
Wu Y; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, China.
Tong J; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, China.
Wignall PB; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, China.

Nat Commun ; 11(1): 2962, 2020 06 11.

Article en En | MEDLINE | ID: mdl-32528009

RESUMEN

Records suggest that the Permo-Triassic mass extinction (PTME) involved one of the most severe terrestrial ecosystem collapses of the Phanerozoic. However, it has proved difficult to constrain the extent of the primary productivity loss on land, hindering our understanding of the effects on global biogeochemistry. We build a new biogeochemical model that couples the global Hg and C cycles to evaluate the distinct terrestrial contribution to atmosphere-ocean biogeochemistry separated from coeval volcanic fluxes. We show that the large short-lived Hg spike, and nadirs in Î´202Hg and Î´13C values at the marine PTME are best explained by a sudden, massive pulse of terrestrial biomass oxidation, while volcanism remains an adequate explanation for the longer-term geochemical changes. Our modelling shows that a massive collapse of terrestrial ecosystems linked to volcanism-driven environmental change triggered significant biogeochemical changes, and cascaded organic matter, nutrients, Hg and other organically-bound species into the marine system.

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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2020 Tipo del documento: Article Pais de publicación: Reino Unido

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