Skip to content

Research at St Andrews

The spread of marine anoxia on the northern Tethys margin during the Paleocene-Eocene Thermal Maximum

Research output: Contribution to journalArticle

DOI

Author(s)

Alexander J. Dickson, Rhian L. Rees-Owen, Christian März, Angela L. Coe, Anthony S. Cohen, Richard D. Pancost, Kyle Taylor, Ekaterina Shcherbinina

Abstract

Records of the paleoenvironmental changes that occurred during the Paleocene-Eocene Thermal Maximum (PETM) are preserved in sedimentary rocks along the margins of the former Tethys Ocean and Peri-Tethys. This paper presents new geochemical data that constrain paleoproductivity, sediment delivery, and seawater redox conditions, from three sites that were located in the Peri-Tethys region. Trace and major element, iron speciation, and biomarker data indicate that water column anoxia was established during episodes when inputs of land-derived higher plant organic carbon and highly weathered detrital clays and silts became relatively higher. Anoxic conditions are likely to have been initially caused by two primary processes: (i) oxygen consumption by high rates of marine productivity, initially stimulated by the rapid delivery of terrestrially derived organic matter and nutrients, and (ii) phosphorus regeneration from seafloor sediments. The role of the latter process requires further investigation before its influence on the spread of deoxygenated seawater during the PETM can be properly discerned. Other oxygen-forcing processes, such as temperature/salinity-driven water column stratification and/or methane oxidation, are considered to have been relatively less important in the study region. Organic carbon enrichments occur only during the initial stages of the PETM as defined by the negative carbon isotope excursions at each site. The lack of observed terminal stage organic carbon enrichment does not support a link between PETM climate recovery and the sequestration of excess atmospheric CO2 as organic carbon in this region; such a feedback may, however, have been important in the early stages of the PETM.

Close

Details

Original languageEnglish
Pages (from-to)471-488
Number of pages18
JournalPaleoceanography
Volume29
Issue number6
DOIs
Publication statusPublished - 2014

    Research areas

  • biomarkers, carbon burial, PETM, redox, Tethys, trace elements

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by journal

  1. Acceleration of northern ice sheet melt induces AMOC slowdown and northern cooling in simulations of the early last deglaciation

    Ivanovic, R., Gregoire, L., Burke, A., Wickert, A. D., Valdes, P. J., Ng, H. C., Robinson, L. F., McManus, J. F., Mitrovica, J. X., Lee, L. & Dentith, J. E., 27 Jul 2018, In : Paleoceanography and Paleoclimatology. Early View, 18 p.

    Research output: Contribution to journalArticle

  2. Deciphering the state of the late Miocene to early Pliocene equatorial Pacific

    Drury, A. J., Lee, G. P., Gray, W. R., Lyle, M., Westerhold, T., Shevenell, A. E. & John, C. M., 11 Mar 2018, In : Paleoceanography and Paleoclimatology. Early View, 18 p.

    Research output: Contribution to journalArticle

  3. Calibration of the B/Ca proxy in the planktic foraminifer Orbulina universa to Paleocene seawater conditions

    Haynes, L. L., Hönisch, B., Dyez, K. A., Holland, K., Rosenthal, Y., Fish, C. R., Subhas, A. V. & Rae, J. W. B., Jun 2017, In : Paleoceanography. 32, 6, p. 580-599

    Research output: Contribution to journalArticle

  4. The evolution of deep ocean chemistry and respired carbon in the Eastern Equatorial Pacific over the last deglaciation

    de la Fuente, M., Calvo, E., Skinner, L., Pelejero, C., Evans, D., Müller, W., Povea, P. & Cacho, I., Dec 2017, In : Paleoceanography and Paleoclimatology. 32, 12, p. 1371-1385 15 p.

    Research output: Contribution to journalArticle

  5. Geochemical imprints of genotypic variants of Globigerina bulloides in the Arabian Sea

    Sadekov, A. Y., Darling, K. F., Ishimura, T., Wade, C. M., Kimoto, K., Singh, A. D., Anand, P., Kroon, D., Jung, S., Ganssen, G., Ganeshram, R., Tsunogai, U. & Elderfield, H., 29 Oct 2016, In : Paleoceanography. 31, 10, p. 1440-1452 13 p.

    Research output: Contribution to journalArticle

ID: 246546261