Liberation of selenium from alteration of the Bowland Shale Formation: evidence from the Mam Tor landslide by John Parnell, Liam Bullock, Joseph Armstrong,

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Liberation of selenium from alteration of the Bowland Shale Formation: evidence from the Mam Tor landslide by John Parnell, Liam Bullock, Joseph Armstrong, and Magali Perez Quarterly Journal of Engineering Geology and Hydrogeology Volume 51(4):503-508 November 8, 2018 © 2018 The Author(s). Published by The Geological Society of London

Location maps and cross-section through Mam Tor landslide (after Waltham & Dixon 2000), showing context of samples. Location maps and cross-section through Mam Tor landslide (after Waltham & Dixon 2000), showing context of samples. John Parnell et al. Quarterly Journal of Engineering Geology and Hydrogeology 2018;51:503-508 © 2018 The Author(s). Published by The Geological Society of London

Cross-plots of (a) Se and As, (b) Se and Cd for samples of Bowland Shale Formation and ochres at Mam Tor. Cross-plots of (a) Se and As, (b) Se and Cd for samples of Bowland Shale Formation and ochres at Mam Tor. Altered samples of shale show depletion of elements. Ochres are enriched in Cd relative to parent shales. All data are anomalous relative to global mean shale concentrations (from Rudnick & Gao 2003; Hu & Gao 2008; Stüeken et al. 2015). John Parnell et al. Quarterly Journal of Engineering Geology and Hydrogeology 2018;51:503-508 © 2018 The Author(s). Published by The Geological Society of London

LA-ICP-MS map for Fe, Se and As in Bowland Shale Formation sample, including a concentration of pyrite. LA-ICP-MS map for Fe, Se and As in Bowland Shale Formation sample, including a concentration of pyrite. Se and As are preferentially distributed within the pyrite. John Parnell et al. Quarterly Journal of Engineering Geology and Hydrogeology 2018;51:503-508 © 2018 The Author(s). Published by The Geological Society of London

Mean concentrations of Se in Bowland Shale Formation and Mam Tor ochre samples, in comparison with concentrations for other rocks regarded as problematic for the environmental consequences of their Se, and low contents in ochres associated with UK coals. Mean concentrations of Se in Bowland Shale Formation and Mam Tor ochre samples, in comparison with concentrations for other rocks regarded as problematic for the environmental consequences of their Se, and low contents in ochres associated with UK coals. Sources are given in the text. John Parnell et al. Quarterly Journal of Engineering Geology and Hydrogeology 2018;51:503-508 © 2018 The Author(s). Published by The Geological Society of London