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{Nielsen:2017:10.2138/rmg.2017.82.18,
author = {Nielsen, SG and Rehkämper, M and Prytulak},
doi = {10.2138/rmg.2017.82.18},
journal = {Reviews in Mineralogy and Geochemistry},
pages = {759--798},
title = {Investigation and application of thallium isotope fractionation},
url = {http://dx.doi.org/10.2138/rmg.2017.82.18},
volume = {82},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - This contribution summarizes the current state of understanding and recent advances made in  the  field  of stable thallium  (Tl) isotope  geochemistry.  High  precision  measurements  of  Tl isotope compositions were  developed  in  the  late  1990s  with  the  advent  ofmultiple  collector inductively  coupled  plasma  mass  spectrometry(MC-ICP MS) and subsequent studies  revealed that Tl, despite the small relative mass difference of the two isotopes,  exhibits substantial stable isotope fractionation,  especially  in  the  marine  environment.  The  most  fractionated  reservoirs identified are ferromanganese sediments with ε205 Tl≈ +15 and low temperature altered oceanic crust with ε205 Tl≈–20.  The total isotopic variability of more than 35 ε 205 Tl-units hence exceeds the current analytical reproducibility ofthe measurement technique by more than a factor of 70. This isotopic  variation  can  be  explained  by  invoking  a  combination  of  conventional  mass dependent  equilibrium  isotope  effects  and  nuclear  field  shift  isotope  fractionation,  but  the specific mechanismsare still largely unaccounted for. Thallium  isotopes  have  been  applied  to  investigate  paleoceanographic  processes  in  the Cenozoic  and  there  is  evidence  to  suggest  that  Tl  isotopes  may  be  utilized  as  a  monitor  of  the marine manganese oxide burial flux over million year time scales. In addition, Tl isotopes can be used to calculate the magnitude of hydrothermal fluid circulation through ocean crust. It has also been  shown  that the subduction  of  marine  ferromanganese  sediments  can  be  detected  with  Tl isotopes in lavas erupted in subduction zone  settings as well as in ocean island basalts. Meteorite samples display Tl isotope variations that exceed the terrestrial range with a total variability of about 50 ε205 Tl. The large isotopic diversity, however, is generated by both stable Tl isotope fraction
AU  - Nielsen,SG
AU  - Rehkämper,M
AU  - Prytulak
DO  - 10.2138/rmg.2017.82.18
EP  - 798
PY  - 2017///
SN  - 1529-6466
SP  - 759
TI  - Investigation and application of thallium isotope fractionation
T2  - Reviews in Mineralogy and Geochemistry
UR  - http://dx.doi.org/10.2138/rmg.2017.82.18
UR  - http://hdl.handle.net/10044/1/42594
VL  - 82
ER  -
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