Scottish Journal of Geology

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Presentation transcript:

Scottish Journal of Geology Multi-stage pyrite genesis and epigenetic selenium enrichment of Greenburn coals (East Ayrshire)‏ by Liam A. Bullock, John Parnell, Magali Perez, Adrian Boyce, Joerg Feldmann, and Joseph G.T. Armstrong Scottish Journal of Geology Volume 54(1):37-49 May 18, 2018 © 2018 The Author(s). Published by The Geological Society of London for EGS and GSG

(a) Southern Scotland and northern England coalfield exposure and locality of the Greenburn surface mine and (b) regional mineral resource geology of the Greenburn surface mine area (Smith et al. 2008). (a) Southern Scotland and northern England coalfield exposure and locality of the Greenburn surface mine and (b) regional mineral resource geology of the Greenburn surface mine area (Smith et al. 2008). Qt, Quaternary deposits; Cbf, Carboniferous deposits; E-Perm, Early Permian deposits. House of Water opencast coal surface (OCCS) mine also shown on map. Liam A. Bullock et al. Scottish Journal of Geology 2018;54:37-49 © 2018 The Author(s). Published by The Geological Society of London for EGS and GSG

Generalized stratigraphical section and sampled coal seams across three localities of the Greenburn surface mine (after Kier Mining 2009). Generalized stratigraphical section and sampled coal seams across three localities of the Greenburn surface mine (after Kier Mining 2009). Liam A. Bullock et al. Scottish Journal of Geology 2018;54:37-49 © 2018 The Author(s). Published by The Geological Society of London for EGS and GSG

Photographs and schematics of banded (yellow) and cleat-filling (orange) pyrite in Greenburn coals. Liam A. Bullock et al. Scottish Journal of Geology 2018;54:37-49 © 2018 The Author(s). Published by The Geological Society of London for EGS and GSG

Fe and Se laser ablation mapping of banded and cleat-filling pyrite in two Greenburn coal samples (map area depicted in schematic by red box). Fe and Se laser ablation mapping of banded and cleat-filling pyrite in two Greenburn coal samples (map area depicted in schematic by red box). High Fe content defines all pyrite phases, while high Se concentrates in cleat-filling pyrite. Liam A. Bullock et al. Scottish Journal of Geology 2018;54:37-49 © 2018 The Author(s). Published by The Geological Society of London for EGS and GSG

Se LA-ICP-MS maps and corresponding line scan transects showing Se peak intensity. Se LA-ICP-MS maps and corresponding line scan transects showing Se peak intensity. Large Se peaks correspond to cleat-filling pyrite perpendicular and parallel to banded pyrite. Liam A. Bullock et al. Scottish Journal of Geology 2018;54:37-49 © 2018 The Author(s). Published by The Geological Society of London for EGS and GSG

Semi-quantification of Se content of pyrite and coal in (a) 9300 Lime and (b) 6900 K. Main Rider coals by LA-ICP-MS. Semi-quantification of Se content of pyrite and coal in (a) 9300 Lime and (b) 6900 K. Main Rider coals by LA-ICP-MS. Liam A. Bullock et al. Scottish Journal of Geology 2018;54:37-49 © 2018 The Author(s). Published by The Geological Society of London for EGS and GSG

S isotopic compositions of pyrite from sampled Greenburn coals, showing that pyrite predominantly formed by diagenetic processes, but some may also have formed due to microbial sulphate reduction, particularly in Westphalian B (Middle Coal Measures) coal seams. S isotopic compositions of pyrite from sampled Greenburn coals, showing that pyrite predominantly formed by diagenetic processes, but some may also have formed due to microbial sulphate reduction, particularly in Westphalian B (Middle Coal Measures) coal seams. Liam A. Bullock et al. Scottish Journal of Geology 2018;54:37-49 © 2018 The Author(s). Published by The Geological Society of London for EGS and GSG