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Kilometre-scale compartmentalization of fluid sources to a fossil hydrothermal system

Kilometre-scale compartmentalization of fluid sources to a fossil hydrothermal system
Kilometre-scale compartmentalization of fluid sources to a fossil hydrothermal system
The West Cumbria iron ore field exhibits kilometre-scale compartmentalization of fluid sources, as evidenced by sulphur isotope data. Barite accompanying haematite ore from 13 mines in an along-strike width of 5 km has δ34S(VCDT) isotopic compositions ranging from +7.9 to +23.6‰. The large variation is strongly controlled by NNW-SSE faulting, in which the heaviest compositions are to the north and lightest in the south. The heavy and light compositions are comparable with those of Carboniferous and Permian evaporites respectively, both of which occur in West Cumbria and are the assumed primary sources of the barite sulphur, though input from the oxidation of Carboniferous coal pyrite may have provided a minor component. The derivation of sulphur from stratigraphically distinct sources shows that faults isolated fluid flow in compartments on a local scale. Published data for barite from an adjacent fault block in a potential waste disposal site at Sellafield are further distinct, indicative of a primary pyrite source. These data emphasize that fluid sources can be highly compartmentalized in a faulted system and require supporting evidence to confirm if they can be correlated.
Barite, Compartmentalization, Cumbria, Haematite, Sulphur-isotopes
0169-1368
Armstrong, Joseph G.T.
e787408b-d6cd-4355-963e-8590a0ce11db
Parnell, John
b86302b0-b930-4b7c-9786-13abc612fef7
Boyce, Adrian J.
e21e60d3-a9ab-4cad-9bd8-f6680f3dbd7f
Bullock, Liam A.
c6ffb9b0-0a54-4ab2-9edb-f97280e6ce2d
Armstrong, Joseph G.T.
e787408b-d6cd-4355-963e-8590a0ce11db
Parnell, John
b86302b0-b930-4b7c-9786-13abc612fef7
Boyce, Adrian J.
e21e60d3-a9ab-4cad-9bd8-f6680f3dbd7f
Bullock, Liam A.
c6ffb9b0-0a54-4ab2-9edb-f97280e6ce2d

Armstrong, Joseph G.T., Parnell, John, Boyce, Adrian J. and Bullock, Liam A. (2020) Kilometre-scale compartmentalization of fluid sources to a fossil hydrothermal system. Ore Geology Reviews, 116, [103207]. (doi:10.1016/j.oregeorev.2019.103207).

Record type: Article

Abstract

The West Cumbria iron ore field exhibits kilometre-scale compartmentalization of fluid sources, as evidenced by sulphur isotope data. Barite accompanying haematite ore from 13 mines in an along-strike width of 5 km has δ34S(VCDT) isotopic compositions ranging from +7.9 to +23.6‰. The large variation is strongly controlled by NNW-SSE faulting, in which the heaviest compositions are to the north and lightest in the south. The heavy and light compositions are comparable with those of Carboniferous and Permian evaporites respectively, both of which occur in West Cumbria and are the assumed primary sources of the barite sulphur, though input from the oxidation of Carboniferous coal pyrite may have provided a minor component. The derivation of sulphur from stratigraphically distinct sources shows that faults isolated fluid flow in compartments on a local scale. Published data for barite from an adjacent fault block in a potential waste disposal site at Sellafield are further distinct, indicative of a primary pyrite source. These data emphasize that fluid sources can be highly compartmentalized in a faulted system and require supporting evidence to confirm if they can be correlated.

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More information

Accepted/In Press date: 30 October 2019
e-pub ahead of print date: 1 November 2019
Published date: 1 January 2020
Keywords: Barite, Compartmentalization, Cumbria, Haematite, Sulphur-isotopes

Identifiers

Local EPrints ID: 437919
URI: http://eprints.soton.ac.uk/id/eprint/437919
ISSN: 0169-1368
PURE UUID: c4ec8182-b8f6-4207-ba29-b1f7cafbba71

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Date deposited: 24 Feb 2020 17:30
Last modified: 25 Nov 2021 17:40

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Contributors

Author: Joseph G.T. Armstrong
Author: John Parnell
Author: Adrian J. Boyce
Author: Liam A. Bullock

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