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Massive sulfide Zn deposits in the Proterozoic did not require euxinia

J.M. Magnall1,

1GFZ German Research Centre for Geosciences, 14473 Potsdam, Germany

S.A. Gleeson1,2,

1GFZ German Research Centre for Geosciences, 14473 Potsdam, Germany
2Institute of Geological Sciences, Freie Universität, 74-100 Malteserstrasse, 12249 Berlin, Germany

N. Hayward3,

3Teck Australia Pty Ltd. Australia

A. Rocholl1

1GFZ German Research Centre for Geosciences, 14473 Potsdam, Germany

Affiliations  |  Corresponding Author  |  Cite as  |  Funding information

Magnall, J.M., Gleeson, S.A., Hayward, N., Rocholl, A. (2020) Massive sulfide Zn deposits in the Proterozoic did not require euxinia. Geochem. Persp. Let. 13, 19–24.

Research funded by: Helmhotz-Rekrutierungsinitive.

Geochemical Perspectives Letters v13  |  doi: 10.7185/geochemlet.2008
Received 31 July 2019  |  Accepted 27 January 2020  |  Published 6 March 2020
Copyright © The Authors

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




Figure 1 Chemostratigraphic sections of the Barney Creek Formation from 3 drill holes of the Teena sub-basin. Sequence stratigraphic relationships correspond with the regional framework in Kunzmann et al., (2019)

Kunzmann, M., Schmid, S., Blaikie, T.N., Halverson, G.P. (2019) Facies analysis, sequence stratigraphy, and carbon isotope chemostratigraphy of a classic Zn-Pb host succession: The Proterozoic middle McArthur Group, McArthur Basin, Australia. Ore Geology Reviews 106, 150-175.

. See Supplementary Information for further details.
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Figure 2 (a) Aggregates of py-1a within organic rich mudstone matrix. (b) Euhedral py-1b crystals within and around carbonate nodule. (c) Zoned aggregates of py-2a. (d) Aggregate of py-1a overgrown by py-2b.
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Figure 3 (a) Thin section block of sample selected for SIMS analysis (mineralised interval @ 925 m in 019; see Fig. 1). (b) Binocular photomicrograph of area selected for micro-drilling and inset showing a backscatter electron (BSE) image of the sample. Notice py-1a contained within dolomite nodule, indicating a pre-nodule origin. (c,d) BSE images of pyrite from the inset in (b). (e) Electron dispersive X-ray (EDX) false colour image, showing Pb enrichment (warm colours) in the fuzzy py-2b overgrowth.
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Figure 4 A cumulative frequency diagram of δ34S values of all stages of the pyrite paragenesis. The sub-group of highly positive δ34Spy-1a values is from samples from the high abundance interval. Mixed analyses where the analysis was of adjoining py-1 and 2 grains = py (mixed). The blue dashed line represents a minimum value for 1.64 Ga seawater sulfate (Li et al., 2015

Li, C., Planavsky, N.J., Love, G.D., Reinhard, C.T., Hardisty, D., Feng, L., Bates, S.M., Huang, J., Zhang, Q., Chu, X., Lyons, T.W. (2015) Marine redox conditions in the middle Proterozoic ocean and isotopic constraints on authigenic carbonate formation: Insights from the Chuanlinggou Formation, Yanshan Basin, North China. Geochimica et Cosmochimica Acta 150, 90–105.

).
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