Liberation of Selenium from Alteration of the Bowland Shale Formation: Evidence from the Mam Tor Landslide

John Parnell (Corresponding Author), Liam Bullock, Joseph Armstrong, Magali Perez

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Abstract

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.
Original languageEnglish
Pages (from-to)503-508
Number of pages6
JournalQuarterly Journal of Engineering Geology and Hydrogeology
Volume51
Issue number4
Early online date28 Jun 2018
DOIs
Publication statusPublished - Nov 2018

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Landslides
Selenium
Shale
selenium
landslide
shale
Pyrites
pyrite
Iron
anomaly
iron
thallium
Thallium
Trace elements
Cadmium
Water
Groundwater
water flow
cadmium
trace element

Cite this

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title = "Liberation of Selenium from Alteration of the Bowland Shale Formation: Evidence from the Mam Tor Landslide",
abstract = "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.",
author = "John Parnell and Liam Bullock and Joseph Armstrong and Magali Perez",
note = "This work was supported by the NERC under Grant NE/M010953/1. We are grateful to the UK Coal Authority for provision of analytical data for ochres. The manuscript was much improved by careful review and editing.",
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TY - JOUR

T1 - Liberation of Selenium from Alteration of the Bowland Shale Formation

T2 - Evidence from the Mam Tor Landslide

AU - Parnell, John

AU - Bullock, Liam

AU - Armstrong, Joseph

AU - Perez, Magali

N1 - This work was supported by the NERC under Grant NE/M010953/1. We are grateful to the UK Coal Authority for provision of analytical data for ochres. The manuscript was much improved by careful review and editing.

PY - 2018/11

Y1 - 2018/11

N2 - 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.

AB - 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.

U2 - 10.1144/qjegh2018-026

DO - 10.1144/qjegh2018-026

M3 - Article

VL - 51

SP - 503

EP - 508

JO - Quarterly Journal of Engineering Geology and Hydrogeology

JF - Quarterly Journal of Engineering Geology and Hydrogeology

SN - 1470-9236

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