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Geological Society, London, Special Publications; 1998; v. 144; p. 153-159;
DOI: 10.1144/GSL.SP.1998.144.01.12
© 1998 Geological Society of London

Case Studies Assessing Timing of Fluid Flow Events

Reconstructing fluid history: an integrated approach to timing fluid expulsion and migration on the Carboniferous Derbyshire Platform, England

Cathy Hollis

Department of Geology and Petroleum Geology, University of Aberdeen, Meston Building, Kings College, Aberdeen AB9 2UE, UK
Badley Ashton and Associates Ltd, Winceby House, Winceby, Horncastle, Lincolnshire LN9 6PB, UK

Galena-sphalerite-baryte-fluorite mineralization and non-economic reserves of liquid hydrocarbon and bitumen are hosted on the Derbyshire Platform within Lower Carboniferous limestone which was deposited during Variscan back-arc extension. The limestone also hosts a sequence of burial calcite cements, precipitated dominantly in crosscutting and refractured extensional vein systems, which typically follow Caledonian-Variscan trends. The calcite cements are often intergrown with galena, sphalerite, baryte and fluorite as well as bitumen, whilst epifluorescence reveals hydrocarbon inclusions. Paragenetic relationships, in conjunction with geochemical results, permit definition of a precise timing for mineralization and hydrocarbon emplacement, and modelling of the source, composition and migration pathways of the mineralizing fluids.