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Series:   Elements in Geochemical Tracers in Earth System Science

The Pyrite Trace Element Paleo-Ocean Chemistry Proxy

Published online by Cambridge University Press:  28 November 2020

Daniel D. Gregory
Daniel D. Gregory
Affiliation:
University of Toronto

Summary

The use of the trace element content of sedimentary pyrite as a proxy for the trace element composition of past oceans has recently emerged. The pyrite proxy has several potential advantages over bulk sample analysis: preservation through metamorphism; little dilution during analysis (samples are ablated not dissolved, allowing for the less abundant elements commonly held in the sulfide fraction to be investigated as proxies); accurate measurement of several elements simultaneously; the ability to screen sediments for hydrothermal overprint; and the technique can give information regarding trace element availably at multiple stages of diagenesis. Because of these multiple strengths, the pyrite trace element proxy is a valuable potential addition to the paleo-ocean chemistry tool kit.
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Keywords

LA-ICPMSpyritepaleoredoxchalcophileocean chemistry
Type
Element
Information
Series: Elements in Geochemical Tracers in Earth System Science
Online ISBN: 9781108846974
Publisher: Cambridge University Press
Print publication: 24 December 2020

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References

Key References

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These papers were among the first to compile LA-ICPMS trace element data of pyrite and showed that it matches existing whole rock studies.Google Scholar
Gregory, D. D., Large, R. R., Halpin, J.A., Baturina, E. L., Lyons, T.W., Wu, S., Danyushevsky, L., Sack, P. J., Chappaz, A., and Maslennikov, V. V. (2015a) Trace Element Content of Sedimentary Pyrite in Black Shales. Economic Geology 110, 1389–1410.Google Scholar
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These papers provide examples where the proxy was used to identify oxygenation events at different times in Earth History.Google Scholar
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Mukherjee, I., and Large, R. R. (2016) Pyrite trace element chemistry of the Velkerri Formation, Roper Group, McArthur Basin: Evidence for atmospheric oxygenation during the Boring Billion. Precambrian Research 281, 13–26.Google Scholar
This paper shows how trace element content of pyrite can be used to distinguish between sedimentary pyrite and hydrothermal pyrite.Google Scholar
Gregory, D. D., Large, R. R., Cracknell, M. J., Kuhn, S., Maslennikov, V. V., Belousoc, I. A., McGoldrich, P., Fabris, A., Baker, M. J., Fox, N., and Lyons, T. W. (2019a) Prediction of ore deposit style from Random Forest analysis of LA-ICPMS analyses of pyrite. Economic Geology.Google Scholar
This paper shows how the trace element content of pyrite in pyrite nodules can be used to obtain information of pore water chemistry during diagenesis.Google Scholar
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