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Geochemistry and metallogeny of Neoproterozoic pyrite in oxic and anoxic sediments

J. Parnell1,

1School of Geosciences, University of Aberdeen, Aberdeen AB24 3UE, UK

M. Perez2,

2Trace Element Speciation Laboratory (TESLA), Department of Chemistry, University of Aberdeen, Aberdeen AB24 3UE, UK

J. Armstrong1,

1School of Geosciences, University of Aberdeen, Aberdeen AB24 3UE, UK

L. Bullock1,

1School of Geosciences, University of Aberdeen, Aberdeen AB24 3UE, UK

J. Feldmann2,

2Trace Element Speciation Laboratory (TESLA), Department of Chemistry, University of Aberdeen, Aberdeen AB24 3UE, UK

A.J. Boyce3

3Scottish Universities Environmental Research Centre, East Kilbride, Glasgow G75 0QF, UK

Affiliations  |  Corresponding Author  |  Cite as  |  Funding information

Parnell, J., Perez, M., Armstrong, J., Bullock, L., Feldmann, J., Boyce, A.J. (2018) Geochemistry and metallogeny of Neoproterozoic pyrite in oxic and anoxic sediments. Geochem. Persp. Let. 7, 12–16.

Natural Environment Research Council Grant No. NE/L001764/1.

Geochemical Perspectives Letters v7  |  doi: 10.7185/geochemlet.1812
Received 22 November 2017  |  Accepted 25 March 2018  |  Published 2 May 2018
Copyright © The Authors

Published by the European Association of Geochemistry
under Creative Commons License CC BY 4.0




Figure 1 Sample map (after Prave et al., 2009

Prave, A.R., Fallick, A.E., Thomas, C.W., Graham, C.M. (2009) A composite C-isotope profile for the Neoproterozoic Dalradian Supergroup of Scotland. Journal of the Geological Society, London 166, 845-857.

). A, Port Askaig; B, Balmore; C, Cullion; D, Fordyce; E, Easdale; F, Meikle Fergie Burn; G, Glenbuchat; H, Strachur; J, Jura Forest; K, Kerrera; L, Bellanamore; M, Muckross; O, Strath Orchy; OA, Mull of Oa; P, Portsoy; R, Croaghan Hill; S, Glen Shee; T, Kiltyfannad/Glencolumbkille; V, Garvellachs; Y, Aberfeldy-Foss.
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Figure 2 Cross-plots of (a) Re/Mo ratio against Te/Se ratio for whole rock samples of diamictites and shales, showing a broad correlation. Both parameters increase with oxygenation of the environment. Samples below detection limit (0.001 ppm) for Re plotted at 50 % of limit. (b) Te/S against Se/S for whole rock samples of diamictites and shales.
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Figure 3 Gold in pyrite, determined by LA-ICP-MS. (a) Element maps for pyrite crystal in diamictite, Mull of Oa, Islay, Scotland. Counts in ppm, except Au counts per second. (b) Cross-plot of Au and Te contents in pyrite. 6 of 7 highest Au values recorded in diamictite.
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Figure 4 Cross-plots of (a) Te against Se contents, and (b) As and Pb contents in pyrite, measured by LA-ICP-MS. Highest concentrations of Te are in the diamictites. Arsenic contents are higher in the shales. Lead contents vary highly in both shales and diamictites, due to late addition by hydrothermal fluids.
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