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A black shale protolith for gold-tellurium mineralisation in the Dalradian Supergroup (Neoproterozoic) of Britain and Ireland

A black shale protolith for gold-tellurium mineralisation in the Dalradian Supergroup (Neoproterozoic) of Britain and Ireland
A black shale protolith for gold-tellurium mineralisation in the Dalradian Supergroup (Neoproterozoic) of Britain and Ireland
The Dalradian Supergroup of Britain and Ireland is mineralised by gold-tellurium vein deposits. The host succession includes carbonaceous, pyritic shales (pelites) which were a source of trace elements, including gold and tellurium. LA-ICP-MS mapping of pyrite crystals shows that late stages are enriched in gold, tellurium and lead, representing concentration of these elements during metamorphism and related hydrothermal activity. The sulphur isotope composition of the pyrite varies with stratigraphic position, reflecting an origin for the pyrite in the depositional environment through microbial sulphate reduction. Where pyrite was converted to pyrrhotite, trace element contents are much lower, indicating element liberation during metamorphism. These observations are consistent with a model of black shale protoliths for orogenic gold deposits.
0371-7453
161-175
Parnell, J.
6794ad9c-f3b9-4fd2-9d1b-876e964d8549
Perez, M.
54507aad-fb4f-4925-8438-e6688d54bbb1
Armstrong, J.
eebf4499-f444-419b-a3ce-35cc09f8bbaf
Bullock, L.
c6ffb9b0-0a54-4ab2-9edb-f97280e6ce2d
Feldmann, J.
98d048f6-c77d-47b1-827c-256b8f04ee70
Boyce, A. J.
337bad06-6252-4f15-9bcd-ebec7f100911
Parnell, J.
6794ad9c-f3b9-4fd2-9d1b-876e964d8549
Perez, M.
54507aad-fb4f-4925-8438-e6688d54bbb1
Armstrong, J.
eebf4499-f444-419b-a3ce-35cc09f8bbaf
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. (2017) A black shale protolith for gold-tellurium mineralisation in the Dalradian Supergroup (Neoproterozoic) of Britain and Ireland. Applied Earth Science IMM Transactions section B, 126 (4), 161-175. (doi:10.1080/03717453.2017.1404682).

Record type: Article

Abstract

The Dalradian Supergroup of Britain and Ireland is mineralised by gold-tellurium vein deposits. The host succession includes carbonaceous, pyritic shales (pelites) which were a source of trace elements, including gold and tellurium. LA-ICP-MS mapping of pyrite crystals shows that late stages are enriched in gold, tellurium and lead, representing concentration of these elements during metamorphism and related hydrothermal activity. The sulphur isotope composition of the pyrite varies with stratigraphic position, reflecting an origin for the pyrite in the depositional environment through microbial sulphate reduction. Where pyrite was converted to pyrrhotite, trace element contents are much lower, indicating element liberation during metamorphism. These observations are consistent with a model of black shale protoliths for orogenic gold deposits.

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Accepted/In Press date: 7 November 2017
e-pub ahead of print date: 30 November 2017
Published date: 30 November 2017

Identifiers

Local EPrints ID: 421840
URI: http://eprints.soton.ac.uk/id/eprint/421840
ISSN: 0371-7453
PURE UUID: ca28f96c-aaa7-452f-9b64-97709bbf3aac

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Date deposited: 29 Jun 2018 16:30
Last modified: 26 Apr 2022 19:32

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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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