CaltechAUTHORS
  A Caltech Library Service

Cenozoic record of δ^(34)S in foraminiferal calcite implies an early Eocene shift to deep-ocean sulfide burial

Rennie, Victoria C. F. and Paris, Guillaume and Sessions, Alex L. and Abramovich, Sigal and Turchyn, Alexandra V. and Adkins, Jess F. (2018) Cenozoic record of δ^(34)S in foraminiferal calcite implies an early Eocene shift to deep-ocean sulfide burial. Nature Geoscience, 11 (10). pp. 761-765. ISSN 1752-0894. http://resolver.caltech.edu/CaltechAUTHORS:20180614-093746378

[img] PDF - Supplemental Material
See Usage Policy.

17Mb
[img] MS Excel (Foram δ^(34)S data) - Supplemental Material
See Usage Policy.

62Kb
[img] MS Excel (δ^(13)C input data) - Supplemental Material
See Usage Policy.

95Kb
[img] PDF (Definitions uncoupled: MATLAB code) - Supplemental Material
See Usage Policy.

19Kb
[img] PDF (Equations uncoupled: MATLAB code) - Supplemental Material
See Usage Policy.

18Kb
[img] PDF (Solve uncoupled: MATLAB code) - Supplemental Material
See Usage Policy.

15Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20180614-093746378

Abstract

Understanding the changes in, and drivers of, isotopic variability of sulfur in seawater sulfate (δ^(34)S_(SO4-sw)) over geological time remains a long-standing goal, particularly because of the coupling between the biogeochemical sulfur and carbon cycles. The early Cenozoic has remained enigmatic in this regard, as the existing seawater sulfate isotopic records appear to be decoupled from the well-defined carbon isotope composition of the ocean. Here, we present a new Cenozoic record of sulfur isotopes, using carbonate-associated sulfate hosted in the calcite lattice of single-species foraminifera. The vastly improved stratigraphy afforded by this record demonstrates that carbon and sulfur cycles, as recorded by their isotopes, are not fully decoupled in the early Cenozoic. With a model driven by partial coupling of the carbon and sulfur cycles, we demonstrate that a change in sulfur isotopic fractionation of the pyrite burial flux best explains the large increase in δ^(34)S_(SO4-sw) ~53 million years ago (Ma) and the subsequent long steady state. We suggest that the locus of pyrite burial changed from shallow epicontinental seas and shelf environments to more open-ocean sediments around 53 Ma. Loss of extensive shelf environments corresponds to Cretaceous–Palaeogene sea-level changes and tectonic reorganization, occurring as the Himalayan arc first collided with Asia.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1038/s41561-018-0200-yDOIArticle
https://rdcu.be/5zSsPublisherFree ReadCube access
ORCID:
AuthorORCID
Paris, Guillaume0000-0001-8368-1224
Sessions, Alex L.0000-0001-6120-2763
Abramovich, Sigal0000-0003-3124-1387
Turchyn, Alexandra V.0000-0002-9298-2173
Alternate Title:A novel Cenozoic record of seawater sulfur isotopes from foraminiferal calcite, Cenozoic record of δ34S in foraminiferal calcite implies an early Eocene shift to deep-ocean sulfide burial, Cenozoic record of Delta34S in foraminiferal calcite implies an early Eocene shift to deep-ocean sulfide burial, Cenozoic record of Delta 34S in foraminiferal calcite implies an early Eocene shift to deep-ocean sulfide burial
Additional Information:© 2018 Springer Nature Limited. Received: 4 February 2018; Accepted: 5 July 2018; Published online: 13 August 2018. We thank M. Vautravers for her expertise with Palaeogene foraminifera and S. Misra, G. Antler and W. Fisher for helpful discussions and advice. This work was supported by a ‘Small Sulfur’ NERC grant (NERC NE/H011595/1), the ERC (ERC StG 307582, CARBONSINK to A.V.T.) and a NERC studentship to V.C.F.R. Author Contributions: V.C.F.R. designed the cleaning tests, did the lab work and analysis for trace element analysis and sulfur isotopes, and wrote the model and the paper. G.P. advised on the cleaning tests, did sulfate and sulfur isotope preparation and analysis, was heavily involved in the modelling and wrote the paper. A.L.S. provided equipment and fruitful discussions. S.A. picked the foraminifera for the stable isotope analyses. A.V.T. provided extensive advice and funding at all stages, had the idea for the shift in ^(34)ε_(SO4-pyr) and wrote the paper. J.F.A. provided guidance and lab equipment for lab work and analysis, advised extensively on the model and wrote the paper. Data availability: The authors declare that all the data and MATLAB codes supporting the finding of this study are available within the article and its supplementary information files. The authors declare no competing interests.
Funders:
Funding AgencyGrant Number
Natural Environment Research Council (NERC)NE/H011595/1
European Research Council (ERC)307582
Record Number:CaltechAUTHORS:20180614-093746378
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180614-093746378
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87097
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:31 Aug 2018 16:17
Last Modified:10 Oct 2018 17:24

Repository Staff Only: item control page