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Decoupling of dissolved and bedrock neodymium isotopes during sedimentary cycling

R.S. Hindshaw1,

1Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK

S.M. Aciego2,

2Department of Earth and Environmental Sciences, University of Michigan, 1100N. University Avenue, Ann Arbor, MI 48109, USA

A.M. Piotrowski1,

1Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK

E.T. Tipper1

1Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK

Affiliations  |  Corresponding Author  |  Cite as  |  Funding information

Hindshaw, R.S., Aciego, S.M., Piotrowski, A.M., Tipper, E.T. (2018) Decoupling of dissolved and bedrock neodymium isotopes during sedimentary cycling. Geochem. Persp. Let. 8, 43–46.

Swiss National Science Foundation, Marie Curie Intra-European Fellowship, NERC Standard Grant, Arctic Field Grant.

Geochemical Perspectives Letters v8  |  doi: 10.7185/geochemlet.1828
Received 20 April 2018  |  Accepted 14 October 2018  |  Published 8 November 2018
Copyright © The Authors

Published by the European Association of Geochemistry
under Creative Commons License CC BY 4.0




Figure 1 Dissolved (<0.22 µm) and solid samples (rock, sediment and stream suspended sediment) form distinct arrays in Sr-Nd space. (a) A linear regression is fitted for the dissolved samples (r2 = 0.93, p < 0.001). The linear line for the solid samples is the mixing line between a Greenlandic (87Sr/86Sr = 0.78059, εNd = -37.1) and Siberian (87Sr/86Sr = 0.70626, εNd = -0.4) sediment source with identical Sr/Nd mass ratios (Hindshaw et al., 2018

Hindshaw, R.S., Tosca, N.J., Piotrowski, A.M., Tipper, E.T. (2018) Clay mineralogy, strontium and neodymium isotope ratios in the sediments of two High Arctic catchments (Svalbard). Earth Surface Dynamics 6, 141-161.

). The four rock and one glacial sediment sample subjected to the leaching procedure are labelled. (b) The isotopic compositions of the leachates, residual and bulk samples. The dissolved load array is bound by leachates of the sandstone (R3) at one end and leachates of the shale samples (R1 and R2) at the other end. (c) The dissolved samples can be fitted with a mixing line between the HH leachate end members. The best fit line uses the concentration and isotopic values measured in R3-HH and R1-HH (Table S-3). The numbers on the mixing line refer to the mass fraction of the sandstone end member in the mixture. Error bars are smaller than symbol size.
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Figure 2 REE concentrations of the leachates normalised to bulk. (a) AA leach. (b) HH leach. REE concentrations are normalised against the bulk REE concentrations of the same sample. Note the scale break in (b). The sandstone sample (R3) has a HREE enriched pattern for both leachates. Shale samples R1 and R2 have MREE enriched patterns for both leachates. REE data is reported in Table S-5.
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