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{Prytulak:2016:10.1016/j.chemgeo.2016.11.007,
author = {Prytulak, J and Brett, A and Webb, M and Plank, T and Rehkamper, M and Savage, PS and Woodhead, J},
doi = {10.1016/j.chemgeo.2016.11.007},
journal = {Chemical Geology},
pages = {71--83},
title = {Thallium elemental behavior and stable isotope fractionation during magmatic processes},
url = {http://dx.doi.org/10.1016/j.chemgeo.2016.11.007},
volume = {448},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Stable thallium (Tl) isotopes are an extremely sensitive tracer for the addition of small amounts of sediments or materials altered at low temperatures to the source(s) of mantle-derived melts. The ability of Tl to trace such materials is due to the largeconcentration contrast between the mantle (Tl < 2ng/g) and possible exotic inputs (Tl$+" ~100ng/g to >g/g), which also often display fractionated Tl isotope compositions.However, the magnitude of Tl isotope fractionation induced by igneous processesalone has not been systematically assessed. Here, two suites of co-genetic magmas, spanning a large range of differentiation, from Hekla, Iceland, and Anatahan, in the Mariana arc, are used to assess the behavior of thallium and its stable isotope variations during magmatic processes. Thallium behaves as a near-perfectly  incompatible lithophile element throughout magmatic evolution, mirroring elements such as Rb, Cs, and K. Lavas from Hekla have restricted Cs/Tl ratios and stable Tl isotope compositions, which overlap with mantle estimates. Lavas from subduction-related Anatahan volcano also have a restricted range in Tl isotope composition, which overlaps with Hekla and MORB, demonstrating that fractional crystallisation and partial melting does not fractionate stable Tl isotopes. Subduction environments display variable Cs/Tl, indicating that the subduction process commonly fractionates these two elements. The immunity of thallium stable isotopes to fractionation by magmatic processes coupled with its extreme sensitivity for tracing pelagic sediments, FeMn crusts and low temperature altered oceanic crust highlight its value in elucidating the nature of mantle sources of both oceanic basalts and arc lavas. Critically, meaningful interpretation of thallium isotope compositions need not be restricted to primitive lavas.
AU  - Prytulak,J
AU  - Brett,A
AU  - Webb,M
AU  - Plank,T
AU  - Rehkamper,M
AU  - Savage,PS
AU  - Woodhead,J
DO  - 10.1016/j.chemgeo.2016.11.007
EP  - 83
PY  - 2016///
SN  - 1872-6836
SP  - 71
TI  - Thallium elemental behavior and stable isotope fractionation during magmatic processes
T2  - Chemical Geology
UR  - http://dx.doi.org/10.1016/j.chemgeo.2016.11.007
UR  - http://hdl.handle.net/10044/1/42337
VL  - 448
ER  -
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