Controls on the temporal and spatial distribution of organic matter in siliciclastic mudstones : implications for source rock development in shale gas plays

A multidisciplinary approach combining thin section and whole rock geochemical analyses has been used to investigate and characterise the Bilinguites gracilis marine band (Marsdenian, Carboniferous) and the fine-grained succession that includes this horizon. The lithofacies, geochemical signatures and organic matter distribution (TOCcalc) are examined from proximal (Brough, Cumbria) and distal (Oakamoor, Staffordshire) successions, relative to main sediment source, across the Pennine Basin. Clay-rich homogeneous mudstones dominate the more proximal succession and contain evidence of intense bioturbation which significantly modified the original fabrics. These bioturbated mudstones are characterised by low abundances of redox-sensitive trace elements (e.g. molybdenum (2%). Therefore, understanding mudstone characteristics (fabric and geochemical signatures) is important to assessing where the organic matter may be concentrated in a potential shale gas play and why.EThOS - Electronic Theses Online ServiceGBUnited Kingdo