Measurement of fossil deep-sea coral Nd isotopic compositions and concentrations by TIMS as NdO+, with evaluation of cleaning protocols

Kirsty C. Crocket*, Myriam Lambelet, Tina van de Flierdt, Mark Rehkaemper, Laura F. Robinson

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

20 Citations (Scopus)

Abstract

Precise and accurate measurements of Nd concentrations and isotopic compositions of small sample masses (

An important issue with fossil corals concerns their apparently higher Nd concentrations compared to modern counterparts (similar to 7-310 ppb vs. similar to 3-51 ppb respectively). Variable to high Nd concentrations could arise for a number of reasons, but here we focus solely on evaluating the effectiveness of coral cleaning to remove external, Nd-rich encrustations. To test this, we measured major and trace metal concentrations (Ca, Fe, Mn, Ti, Al, Ce, Nd, Th, U) in paired aragonite and FeMn coatings from the same samples. Mass balance calculations reveal negligible influence of FeMn coatings on the final epsilon(Nd), although four samples showed some degree of contamination as demonstrated by elevated Fe, Mn, Ti and Th concentrations. (C) 2014 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)128-140
Number of pages13
JournalChemical Geology
Volume374
DOIs
Publication statusPublished - 26 May 2014

Keywords

  • TIMS
  • NdO+
  • Nd isotopes
  • Deep-sea corals
  • Scleractinian corals
  • Desmophyllum dianthus
  • EARTH-ELEMENT CONCENTRATIONS
  • NORTH-ATLANTIC
  • HIGH-PRECISION
  • NEODYMIUM ISOTOPES
  • GEOTRACES INTERCALIBRATION
  • MASS-SPECTROMETRY
  • EARLY DIAGENESIS
  • MC-ICPMS
  • SEAWATER
  • SM

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