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Determination of Rare Earth Element Isotopic Compositions Using Sample-Standard Bracketing and Double-Spike Approaches.

Published version
Peer-reviewed

Repository DOI


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Authors

Tissot, Francois LH  ORCID logo  https://orcid.org/0000-0001-6622-2907
Yokochi, Reika 
Ireland, Thomas J 
Dauphas, Nicolas 

Abstract

Rare earth elements (REEs) have been found to have numerous uses to trace geological and cosmochemical processes through analyses of elemental patterns, radioactive decay, nucleosynthetic anomalies, and cosmogenic effects. Stable isotopic fractionation is one aspect of REE geochemistry that has been seldom studied, with most publications focusing on the development of analytical methodologies for individual REEs, and most applications concerning terrestrial igneous rocks. In this study, we present a method to systematically analyze stable isotopic fractionations of 8 REEs, including Ce, Nd, Sm, Eu, Gd, Dy, Er, and Yb, using sample-standard bracketing (SSB) and double-spike (DS) approaches. All REEs are separated and purified using a fluoropolymer pneumatic liquid chromatography (FPLC) system. We introduce procedures for identifying and correcting some isobaric interferences in double-spike data reduction. Several geostandards, including igneous rocks and sediments, are analyzed using SSB and DS methods. The results indicate that REE isotopic fractionation in igneous processes is limited, except for Eu. Other REEs can still be isotopically fractionated by low-temperature processes and kinetic effects at a high temperature.

Description

Publication status: Published

Keywords

37 Earth Sciences, 3703 Geochemistry, 3705 Geology

Journal Title

ACS Earth Space Chem

Conference Name

Journal ISSN

2472-3452
2472-3452

Volume Title

7

Publisher

American Chemical Society (ACS)
Sponsorship
European Commission Horizon 2020 (H2020) ERC (101020665)
NERC (NE/V000411/1)