Forms and distribution of Ce in a ferromanganese nodule

Matthew A. Marcus, Brandy M. Toner, Yoshio Takahashi

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

We studied the distribution and speciation of Ce in a previously-characterized ferromanganese nodule from the South Pacific Gyre using X-ray microspectroscopy.We find Ce in three types of environment – diffusely in all parts of the nodule except the Fe-rich, Mn-poor “matrix”, fluorapatite grains with a negative Ce anomaly suggestive of an authigenic origin, and localized spots whose composition is consistent with a pseudobinary mixture of sorbed Ce4+ and a mix of sorbed Ce3+ and CeO2. In contrast with some other elements such as Ti, there is no clear correlation of the Ce concentration in the diffuse areas with either that of Mn, Fe or any linear combination of the two.We argue that the CeO2 came from oxidation of Ce3+ in the water column, while the Ce in the Mn-rich regions may have been initially deposited as Ce4+ and then partially reduced.

Original languageEnglish (US)
Pages (from-to)58-66
Number of pages9
JournalMarine Chemistry
Volume202
DOIs
StatePublished - May 20 2018

Bibliographical note

Funding Information:
We thank the science team, especially Gregory Horn, the crew, and the Chief Scientist Steven D'Hondt of the KNOX02RR cruise for access to the South Pacific Gyre nodule samples. We gratefully acknowledge John Fournelle and Tony Giuffre for sample preparation and electron microprobe on the apatite standard. The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DEAC02-05CH11231 . Appendix A

Funding Information:
We thank the science team, especially Gregory Horn, the crew, and the Chief Scientist Steven D'Hondt of the KNOX02RR cruise for access to the South Pacific Gyre nodule samples. We gratefully acknowledge John Fournelle and Tony Giuffre for sample preparation and electron microprobe on the apatite standard. The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DEAC02-05CH11231.

Publisher Copyright:
© 2018

Keywords

  • Cerium
  • Chemical speciation
  • Ferromanganese nodule
  • X-ray spectroscopy

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