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Severe selenium depletion in the Phanerozoic oceans as a factor in three global mass extinction events

journal contribution
posted on 2023-05-18, 14:02 authored by Long, JA, Ross LargeRoss Large, Lee, MSY, Benton, MJ, Leonid Danyushevsky, Chiappe, LM, Jacqueline HalpinJacqueline Halpin, Cantrill, D, Bernd Lottermoser
Selenium (Se) is one of the key trace elements required by all animal and most plant life, and Se deficiencies in the food chain cause pathologies or death. Here we show from new geochemical analyses of trace elements in Phanerozoic marine pyrite that sustained periods of severe Se depletion in the past oceans correlate closely with three major mass extinction events, at the end of the Ordovician, Devonian and Triassic periods. These represent periods of Se depletion >1.5–2 orders of magnitude lower than current ocean abundances, being within the range to cause severe pathological damage in extant Se-reliant organisms. Se depletion may have been one of several factors in these complex extinction scenarios. Recovery from the depletion/extinction events is likely part of a natural marine cycle, although rapid rises in global oxygen from sudden major increases in marine productivity and plant biomass after each extinction event may also have played a crucial role.

Funding

Australian Research Council

History

Publication title

Gondwana Research

Volume

36

Pagination

209-218

ISSN

1342-937X

Department/School

School of Natural Sciences

Publisher

Elsevier BV

Place of publication

Netherlands

Rights statement

Copyright 2015 International Association for Gondwana Research

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the earth sciences

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