Imperial College London
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ProfessorJamieWilkinson

Faculty of Engineering, Department of Earth Science & Engineering

Professor of Geology
 
 
 
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Contact

 

j.wilkinson Website

 
 
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Location

 

PA418Natural History MuseumNatural History Museum

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Summary

 

Publications

Citation

BibTex format

@article{Fitzpayne:2018:10.3390/min8120548,
author = {Fitzpayne, A and Prytulak, J and Wilkinson, J and Cooke, D and Baker, M and Wilkinson, C},
doi = {10.3390/min8120548},
journal = {Minerals},
title = {Assessing thallium elemental systematics and isotope ratio variations in porphyry ore systems: A case study of the Bingham Canyon district},
url = {http://dx.doi.org/10.3390/min8120548},
volume = {8},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The Bingham Canyon porphyry deposit is one of the world’s largest Cu-Mo-Au resources. Elevated concentrations of thallium (Tl) compared to average continental crust have been found in some brecciated and igneous samples in this area, which likely result from mobilization of Tl by relatively low temperature hydrothermal fluids. The Tl-enrichment at Bingham Canyon therefore provides an opportunity to investigate if Tl isotope ratios reflect hydrothermal enrichment and whether there are systematic Tl isotope fractionations that could provide an exploration tool. We present a reconnaissance study of nineteen samples spanning a range of lithologies from the Bingham district which were analysed for their Tl content and Tl isotope ratios, reported as parts per ten thousand (ε205Tl) relative to the NIST SRM997 international standard. The range of ε205Tl reported in this study (−16.4 to +7.2) is the largest observed in a hydrothermal ore deposit to date. Unbrecciated samples collected relatively proximal to the Bingham Canyon porphyry system have ε205Tl of −4.2 to +0.9, similar to observations in a previous study of porphyry deposits. This relatively narrow range suggests that high-temperature (>300 °C) hydrothermal alteration does not result in significant Tl isotope fractionation. However, two samples ~3–4 km away from Bingham Canyon have higher ε205Tl values (+1.3 and +7.2), and samples from more distal (~7 km) disseminated gold deposits at Melco and Barneys Canyon display an even wider range in ε205Tl (−16.4 to +6.0). The observation of large positive and negative excursions in ε205Tl relative to the mantle value (ε205Tl = −2.0 ± 1.0) contrasts with previous investigations of hydrothermal systems. Samples displaying the most extreme positive and negative ε205Tl values also contain elevated concentrations of Tl-Sb-As. Furthermore, with the exception of one
AU  - Fitzpayne,A
AU  - Prytulak,J
AU  - Wilkinson,J
AU  - Cooke,D
AU  - Baker,M
AU  - Wilkinson,C
DO  - 10.3390/min8120548
PY  - 2018///
SN  - 2075-163X
TI  - Assessing thallium elemental systematics and isotope ratio variations in porphyry ore systems: A case study of the Bingham Canyon district
T2  - Minerals
UR  - http://dx.doi.org/10.3390/min8120548
UR  - http://hdl.handle.net/10044/1/64742
VL  - 8
ER  -
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