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Liberation of selenium from alteration of the Bowland Shale Formation: evidence from the Mam Tor landslide

Liberation of selenium from alteration of the Bowland Shale Formation: evidence from the Mam Tor landslide
Liberation of selenium from alteration of the Bowland Shale Formation: evidence from the Mam Tor landslide
The Bowland Shale Formation is anomalously rich in selenium (Se) at levels an order of magnitude greater than other black shales. The Mam Tor landslide, Derbyshire, England, offers an opportunity to measure whether the Se anomaly is conferred to the alteration products formed by oxidative water flow through the shale. Selenium in the shale is concentrated in diagenetic pyrite. Alteration of the shale causes decomposition of the pyrite to iron oxyhydroxide, which is carried in colloidal form (ochre) by springs draining the landslide. The iron oxyhydroxide contains anomalously high Se, and anomalously high Se was measured in water ponded where the ochre precipitated, although not in flowing groundwater. Other trace elements including cadmium and thallium also occur at concentrations higher than in other ochres. Given the widespread nature of the Se anomaly in the Bowland Shale Formation and equivalents across Britain and Ireland, any alteration products derived from workings through the shale should be disposed of with care.
Selenium, black shale, Ochre
1470-9236
503-508
Parnell, John
b86302b0-b930-4b7c-9786-13abc612fef7
Bullock, Liam
c6ffb9b0-0a54-4ab2-9edb-f97280e6ce2d
Armstrong, Joseph
1d24c89a-37ea-444d-b3a0-669e4c8ed79f
Perez, Magali
496b62b9-ca3a-4b78-aaf7-4d14627f5771
Parnell, John
b86302b0-b930-4b7c-9786-13abc612fef7
Bullock, Liam
c6ffb9b0-0a54-4ab2-9edb-f97280e6ce2d
Armstrong, Joseph
1d24c89a-37ea-444d-b3a0-669e4c8ed79f
Perez, Magali
496b62b9-ca3a-4b78-aaf7-4d14627f5771

Parnell, John, Bullock, Liam, Armstrong, Joseph and Perez, Magali (2018) Liberation of selenium from alteration of the Bowland Shale Formation: evidence from the Mam Tor landslide. Quarterly Journal of Engineering Geology and Hydrogeology, 51 (4), 503-508, [51]. (doi:10.1144/qjegh2018-026).

Record type: Article

Abstract

The Bowland Shale Formation is anomalously rich in selenium (Se) at levels an order of magnitude greater than other black shales. The Mam Tor landslide, Derbyshire, England, offers an opportunity to measure whether the Se anomaly is conferred to the alteration products formed by oxidative water flow through the shale. Selenium in the shale is concentrated in diagenetic pyrite. Alteration of the shale causes decomposition of the pyrite to iron oxyhydroxide, which is carried in colloidal form (ochre) by springs draining the landslide. The iron oxyhydroxide contains anomalously high Se, and anomalously high Se was measured in water ponded where the ochre precipitated, although not in flowing groundwater. Other trace elements including cadmium and thallium also occur at concentrations higher than in other ochres. Given the widespread nature of the Se anomaly in the Bowland Shale Formation and equivalents across Britain and Ireland, any alteration products derived from workings through the shale should be disposed of with care.

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Parnell et al 2018 Mam Tor - Version of Record
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More information

Accepted/In Press date: 15 June 2018
e-pub ahead of print date: 29 June 2018
Published date: November 2018
Keywords: Selenium, black shale, Ochre

Identifiers

Local EPrints ID: 426137
URI: http://eprints.soton.ac.uk/id/eprint/426137
ISSN: 1470-9236
PURE UUID: 5f093cfe-a2db-48a6-809a-4f559b156d74

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Date deposited: 15 Nov 2018 17:30
Last modified: 15 Mar 2024 22:44

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Author: John Parnell
Author: Liam Bullock
Author: Joseph Armstrong
Author: Magali Perez

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