Articles | Volume 18, issue 22
Research article
22 Nov 2021
Research article |  | 22 Nov 2021

Pyrite-lined shells as indicators of inefficient bioirrigation in the Holocene–Anthropocene stratigraphic record

Adam Tomašových, Michaela Berensmeier, Ivo Gallmetzer, Alexandra Haselmair, and Martin Zuschin

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Cited articles

Ahmerkamp, S., Winter, C., Krämer, K., Beer, D. D., Janssen, F., Friedrich, J., Kuypers, M. M., and Holtappels, M.: Regulation of benthic oxygen fluxes in permeable sediments of the coastal ocean, Limnol. Oceanogr., 62, 1935–1954, 2017. 
Algeo, T. J., Luo, G. M., Song, H. Y., Lyons, T. W., and Canfield, D. E.: Reconstruction of secular variation in seawater sulfate concentrations, Biogeosciences, 12, 2131–2151,, 2015. 
Allen, R. E.: Role of diffusion–precipitation reactions in authigenic pyritization, Chem. Geol., 182, 461–472, 2002. 
Aller, R. C.: Carbonate dissolution in nearshore terrigenous muds: the role of physical and biological reworking, J. Geol., 90, 79–95, 1982. 
Short summary
The timescale of mixing and irrigation of sediments by burrowers that affect biogeochemical cycles is difficult to estimate in the stratigraphic record. We show that pyrite linings in molluscan shells preserved below the mixed layer represent a signature of limited bioirrigation. We document an increase in the frequency of pyrite-lined shells in cores collected in the northern Adriatic Sea, suggesting that bioirrigation rates significantly declined during the late 20th century.
Final-revised paper