Skip to content

Research at St Andrews

A record of Neogene seawater δ11B reconstructed from paired δ11B analyses on benthic and planktic foraminifera

Research output: Contribution to journalArticle

Author(s)

Rosanna Greenop, Mathis P. Hain, Sindia M. Sosdian, Kevin I. C. Oliver, Philip Goodwin, Thomas B. Chalk, Caroline H. Lear, Paul A. Wilson, Gavin L. Foster

School/Research organisations

Abstract

The boron isotope composition (δ11B) of foraminiferal calcite reflects the pH and the boron isotope composition of the seawater the foraminifer grew in. For pH reconstructions, the δ11B of seawater must therefore be known, but information on this parameter is limited. Here we reconstruct Neogene seawater δ11B based on the δ11B difference between paired measurements of planktic and benthic foraminifera and an estimate of the coeval water column pH gradient from their δ13C values. Carbon cycle model simulations underscore that the ΔpH-Δδ13C relationship is relatively insensitive to ocean and carbon cycle changes, validating our approach. Our reconstructions suggest that δ11Bsw was ∼37.5‰ during the early and middle Miocene (roughly 23-12 Ma) and rapidly increased during the late Miocene (between 12 and 5 Ma) towards the modern value of 39.61 ‰. Strikingly, this pattern is similar to the evolution of the seawater isotope composition of Mg, Li and Ca, suggesting a common forcing mechanism. Based on the observed direction of change, we hypothesize that an increase in secondary mineral formation during continental weathering affected the isotope composition of riverine input to the ocean since 14 Ma.

Close

Details

Original languageEnglish
Pages (from-to)149-170
Number of pages22
JournalClimate of the Past
Volume13
Issue number2
DOIs
StatePublished - 24 Feb 2017

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

View graph of relations

Related by author

  1. CO2 storage and release in the deep Southern Ocean on millennial to centennial timescales

    Rae, J. W. B., Burke, A., Robinson, L. F., Adkins, J. F., Chen, T., Cole, C., Greenop, R., Li, T., Littley, E., Nita, D. C., Stewart, J. A. & Taylor, B. 24 Oct 2018 In : Nature. 562, p. 569-573

    Research output: Contribution to journalLetter

  2. Constraining the evolution of Neogene ocean carbonate chemistry using the boron isotope pH proxy

    Sosdian, S. M., Greenop, R., Hain, M. P., Foster, G. L., Pearson, P. N. & Lear, C. H. 15 Sep 2018 In : Earth and Planetary Science Letters. 498, p. 362-376 15 p.

    Research output: Contribution to journalArticle

  3. Data report: revised composite depth scale and splice for IODP Site U1406

    van Peer, T., Liebrand, D., Xuan, C., Lippert, P., Agnini, C., Blum, N., Blum, P., Bohaty, S., Bown, P., Greenop, R., Kordesch, W., Leonhardt, D., Friedrich, O. & Wilson, P. 31 Jul 2017 Proceedings of the Integrated Ocean Drilling Program, 342

    Research output: Contribution to specialist publicationArticle

  4. A new boron isotope-pH calibration for Orbulina universa, with implications for understanding and accounting for ‘vital effects’

    Henehan, M. J., Foster, G. L., Bostock, H. C., Greenop, R., Marshall, B. J. & Wilson, P. A. 15 Nov 2016 In : Earth and Planetary Science Letters. 454, p. 282-292 11 p.

    Research output: Contribution to journalArticle

  5. Middle Miocene climate instability associated with high-amplitude CO2 variability

    Greenop, R., Foster, G. L., Wilson, P. A. & Lear, C. H. Sep 2014 In : Paleoceanography. 29, 9, p. 845-853 9 p.

    Research output: Contribution to journalArticle

Related by journal

  1. Experiments based on blue intensity for reconstructing North Pacific temperatures along the Gulf of Alaska

    Wilson, R., D'Arrigo, R., Andreu-Hayles, L., Oelkers, R., Wiles, G., Anchukaitis, K. & Davi, N. 16 Aug 2017 In : Climate of the Past. 13, 8, p. 1007-1022 16 p.

    Research output: Contribution to journalArticle

  2. Amplified bioproductivity during Transition IV (332 000-342 000 yr ago): evidence from the geochemical record of Lake El'gygytgyn

    Cunningham, L., Vogel, H., Wennrich, V., Juschus, O., Nowaczyk, N. & Rosen, P. 14 Mar 2013 In : Climate of the Past. 9, 2, p. 679-686 8 p.

    Research output: Contribution to journalArticle

ID: 249348278