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

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...

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Bibliographic Details
Published in:Chemical Geology
Main Authors: Crocket, Kirsty C., Lambelet, Myriam, de Flierdt, Tina van, Rehkaemper, Mark, Robinson, Laura F.
Format: Article in Journal/Newspaper
Language:English
Published: 2014
Subjects:
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
North Atlantic
Online Access:https://hdl.handle.net/1983/ab8bd396-9231-4a19-9cd1-949abe5d1293
https://research-information.bris.ac.uk/en/publications/ab8bd396-9231-4a19-9cd1-949abe5d1293
https://doi.org/10.1016/j.chemgeo.2014.03.011
Description
Summary: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.

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