Imperial College London
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Professor Mark Rehkämper

Faculty of Engineering, Department of Earth Science & Engineering

Professor of Isotope Geochemistry
 
 
 
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Contact

 

markrehk Website

 
 
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Location

 

451Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Little:2021:10.1016/j.chemgeo.2021.120304,
author = {Little, SH and Wilson, DJ and Rehkämper, M and Adkins, JF and Robinson, LF and van, de Flierdt T},
doi = {10.1016/j.chemgeo.2021.120304},
journal = {Chemical Geology},
pages = {1--20},
title = {Cold-water corals as archives of seawater Zn and Cu isotopes},
url = {http://dx.doi.org/10.1016/j.chemgeo.2021.120304},
volume = {578},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Traditional carbonate sedimentary archives have proven challenging to exploit for Zn and Cu isotopes, due to the high concentrations of trace metals in potential contaminants (e.g., Fe-Mn coatings) and their low concentrations in carbonate. Here, we present the first dataset of δ66ZnJMC-Lyon and δ65CuSRM 976 values for cold-water corals and address their potential as a seawater archive. Extensive cleaning experiments carried out on two corals with well-developed Fe-Mn rich coatings demonstrate that thorough physical and chemical cleaning can effectively remove detrital and authigenic contaminants. Next, we present metal/Ca ratios and δ66Zn and δ65Cu values for a geographically diverse sample set of Holocene age cold-water corals. Comparing cold-water coral δ66Zn values to estimated ambient seawater δ66Zn values (where Δ66Zncoral-sw = δ66Zncoral – δ66Znseawater), we find Δ66Zncoral-sw = +0.03 ± 0.17‰ (1SD, n = 20). Hence, to a first order, cold-water corals record seawater Zn isotope compositions without fractionation. The average Holocene coral Cu isotope composition is +0.59 ± 0.23‰ (1SD, n = 15), similar to the mean of published deep seawater δ65Cu values at +0.66 ± 0.09‰, but with considerable variability. Finally, δ66Zn and δ65Cu data are presented for a small subset of four glacial-age corals. These values overlap with the respective Holocene coral datasets, hinting at limited glacial-interglacial changes in oceanic Zn and Cu cycling.
AU  - Little,SH
AU  - Wilson,DJ
AU  - Rehkämper,M
AU  - Adkins,JF
AU  - Robinson,LF
AU  - van,de Flierdt T
DO  - 10.1016/j.chemgeo.2021.120304
EP  - 20
PY  - 2021///
SN  - 0009-2541
SP  - 1
TI  - Cold-water corals as archives of seawater Zn and Cu isotopes
T2  - Chemical Geology
UR  - http://dx.doi.org/10.1016/j.chemgeo.2021.120304
UR  - https://www.sciencedirect.com/science/article/pii/S0009254121002485?via%3Dihub
UR  - http://hdl.handle.net/10044/1/89294
VL  - 578
ER  -
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