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Tellurium, selenium and cobalt enrichment in Neoproterozoic black shales, Gwna Group, UK: deep marine trace element enrichment during the Second Great Oxygenation Event

Tellurium, selenium and cobalt enrichment in Neoproterozoic black shales, Gwna Group, UK: deep marine trace element enrichment during the Second Great Oxygenation Event
Tellurium, selenium and cobalt enrichment in Neoproterozoic black shales, Gwna Group, UK: deep marine trace element enrichment during the Second Great Oxygenation Event
Black shales of the late Neoproterozoic Gwna Group (570–580 Ma), UK, contain enrichments of tellurium (Te), selenium (Se) and cobalt (Co) relative to average shale compositions. The Te and Co enrichments bear comparison with those of ferromanganese crusts in the modern deep ocean. Gwna Group deposition coincides with the Second Great Oxidation Event, which had a significant effect on trace element fixation globally. Selenium and Te concentrations within these black shales indicate increased continental weathering rates, high biological productivity and corresponding increases in atmospheric O2 concentrations. Cobalt, nickel (Ni) and arsenic (As) enrichments in this succession are secondary mineralisation phases. Demand for many of the trace elements found enriched in the Gwna Group black shales make their mechanisms of accumulation, and variations through the geological record, important to understand, and suggests that new resources may be sought based on black shale protoliths from this period.
0954-4879
244-253
Armstrong, Joseph G. T.
e787408b-d6cd-4355-963e-8590a0ce11db
Parnell, John
b86302b0-b930-4b7c-9786-13abc612fef7
Bullock, Liam A.
c6ffb9b0-0a54-4ab2-9edb-f97280e6ce2d
Perez, Magali
496b62b9-ca3a-4b78-aaf7-4d14627f5771
Boyce, Adrian J.
e21e60d3-a9ab-4cad-9bd8-f6680f3dbd7f
Feldmann, Jorg
792af416-2750-497f-8168-8f7440dfd5c9
Armstrong, Joseph G. T.
e787408b-d6cd-4355-963e-8590a0ce11db
Parnell, John
b86302b0-b930-4b7c-9786-13abc612fef7
Bullock, Liam A.
c6ffb9b0-0a54-4ab2-9edb-f97280e6ce2d
Perez, Magali
496b62b9-ca3a-4b78-aaf7-4d14627f5771
Boyce, Adrian J.
e21e60d3-a9ab-4cad-9bd8-f6680f3dbd7f
Feldmann, Jorg
792af416-2750-497f-8168-8f7440dfd5c9

Armstrong, Joseph G. T., Parnell, John, Bullock, Liam A., Perez, Magali, Boyce, Adrian J. and Feldmann, Jorg (2018) Tellurium, selenium and cobalt enrichment in Neoproterozoic black shales, Gwna Group, UK: deep marine trace element enrichment during the Second Great Oxygenation Event. Terra Nova, 30 (3), 244-253. (doi:10.1111/ter.2018.30.issue-3).

Record type: Article

Abstract

Black shales of the late Neoproterozoic Gwna Group (570–580 Ma), UK, contain enrichments of tellurium (Te), selenium (Se) and cobalt (Co) relative to average shale compositions. The Te and Co enrichments bear comparison with those of ferromanganese crusts in the modern deep ocean. Gwna Group deposition coincides with the Second Great Oxidation Event, which had a significant effect on trace element fixation globally. Selenium and Te concentrations within these black shales indicate increased continental weathering rates, high biological productivity and corresponding increases in atmospheric O2 concentrations. Cobalt, nickel (Ni) and arsenic (As) enrichments in this succession are secondary mineralisation phases. Demand for many of the trace elements found enriched in the Gwna Group black shales make their mechanisms of accumulation, and variations through the geological record, important to understand, and suggests that new resources may be sought based on black shale protoliths from this period.

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Accepted/In Press date: 21 January 2018
e-pub ahead of print date: 9 February 2018
Published date: 7 May 2018

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Local EPrints ID: 421813
URI: https://eprints.soton.ac.uk/id/eprint/421813
ISSN: 0954-4879
PURE UUID: 0d4fe787-8adb-4b2a-9363-65367e3474f9

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Date deposited: 28 Jun 2018 16:30
Last modified: 13 Mar 2019 18:24

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