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Geochemistry and metallogeny of Neoproterozoic pyrite in oxic and anoxic sediments

Geochemistry and metallogeny of Neoproterozoic pyrite in oxic and anoxic sediments
Geochemistry and metallogeny of Neoproterozoic pyrite in oxic and anoxic sediments
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.
12-16
Parnell, J.
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Perez, M.
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Armstrong, J.
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Bullock, L.
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Feldmann, J.
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Boyce, A.j.
337bad06-6252-4f15-9bcd-ebec7f100911
Parnell, J.
6794ad9c-f3b9-4fd2-9d1b-876e964d8549
Perez, M.
5aab115e-5669-4fa9-aff8-558b7b48007c
Armstrong, J.
2a6feade-c959-426e-a1ca-d07cf6bb1004
Bullock, L.
c6ffb9b0-0a54-4ab2-9edb-f97280e6ce2d
Feldmann, J.
98d048f6-c77d-47b1-827c-256b8f04ee70
Boyce, A.j.
337bad06-6252-4f15-9bcd-ebec7f100911

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 (1), 12-16. (doi:10.7185/geochemlet.1812).

Record type: Article

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.

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Accepted/In Press date: 25 March 2018
e-pub ahead of print date: 1 May 2018
Published date: 2 May 2018

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Local EPrints ID: 421694
URI: http://eprints.soton.ac.uk/id/eprint/421694
PURE UUID: 5337414c-61a1-47ca-8621-79ecbdbcf8ac

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Date deposited: 21 Jun 2018 16:30
Last modified: 08 Jan 2022 07:28

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Contributors

Author: J. Parnell
Author: M. Perez
Author: J. Armstrong
Author: L. Bullock
Author: J. Feldmann
Author: A.j. Boyce

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