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Geological Society, London, Special Publications; 1996; v. 107; p. 35-49;
DOI: 10.1144/GSL.SP.1996.107.01.04
© 1996 Geological Society of London

Mineralization, Hydrocarbons and Diagenesis

The use of burial diagenetic calcite cements to determine the controls upon hydrocarbon emplacement and mineralization on a carbonate platform, Derbyshire, England

Cathy Hollis & Gordon Walkden

Department of Geology and Petroleum Geology, University of Aberdeen, Meston Building, Kings College, Aberdeen AB9 2UE, UK

Cathy Hollis1

1 Badley Ashton and Associates, Winceby House, Winceby, Horncastle, Lincolnshire LN9 6PB, UK

Late diagenetic calcite cements in the Upper Dinantian limestones of the Derbyshire Platform are contemporaneous with both hydrocarbon emplacement and Mississippi Valley-type (MVT) mineralization. Calcite cementation began during the progressive burial of the Derbyshire Platform and the surrounding basins, principally within fractures generated during the waning effects of Upper Carboniferous extension. Six burial calcite cements can be recognized in dilational vein systems. Successive veins contain progressively more mature hydrocarbon inclusions, and calcite cements are intergrown with fluorite, baryte, galena and sphalerite in increasing quantities. Compacting Dinantian-Namurian shales in basins adjacent to the platform offer the most likely sources of fluids, trace elements and hydrocarbons. Fluids entered the platform along major fault systems, and circulated using smaller fracture systems, precipitating calcite. The final phases of calcite cementation and the main phase of MVT mineralization coincided with the onset of the Variscan Orogeny. A model is now established relating fluid flow to Variscan tectonic events in northern Britain.





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