Geochemistry and metallogeny of Neoproterozoic pyrite in oxic and anoxic sediments

Parnell, J., Perez, M., Armstrong, J., Bullock, L., Feldmann, J. and Boyce, A.J. (2018) Geochemistry and metallogeny of Neoproterozoic pyrite in oxic and anoxic sediments. Geochemical Perspectives Letters, 7, pp. 12-16. (doi: 10.7185/geochemlet.1812)

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Abstract

The Neoproterozoic Dalradian Supergroup contains widespread diagenetic sulphides present as pyrite. The sulphides occur in both carbonaceous shales and glacial diamictites, that were deposited in relatively reducing and oxidising conditions respectively. The trace element compositions of the pyrite, and consequently the whole rock compositions, contrast between the two lithologies. The highest concentrations of selenium, tellurium and gold are all found in diamictite-hosted pyrite. The data suggest that increased mobility of these elements in oxidising conditions led to greater uptake when pyrite was precipitated. As one model for the formation of orogenic gold ore deposits assumes a sulphide-rich protolith, pyrite ultimately formed during relatively oxidising conditions could make a contribution, including the widespread pyrite precipitated during the Neoproterozoic ‘Snowball Earth’ glaciations.

Item Type:Articles
Additional Information:This work was supported by the NERC under Grant number NE/L001764/1. AJB is funded by NERC support of the Isotope Community Support Facility at SUERC.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Boyce, Professor Adrian
Authors: Parnell, J., Perez, M., Armstrong, J., Bullock, L., Feldmann, J., and Boyce, A.J.
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Geochemical Perspectives Letters
Publisher:European Association of Geochemistry
ISSN:2410-339X
ISSN (Online):2410-3403
Copyright Holders:Copyright © 2018 The Authors
First Published:First published in Geochemical Perspectives Letters 7:12-16
Publisher Policy:Reproduced under a Creative Commons License

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