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Geological Society, London, Special Publications; 1992; v. 62; p. 243-254;
DOI: 10.1144/GSL.SP.1992.062.01.20
© 1992 Geological Society of London

Onshore and Offshore North of Ireland

Origin of reddening and secondary porosity in Carboniferous sandstones, Northern Ireland

W. H. Wang

School of Geosciences, The Queen’s University of Belfast, Belfast BT7 1NN, UK

Carboniferous sandstones in the Ballycastle district of Northern Ireland were deposited in fluvio-deltaic environments. Significant secondary porosity was generated in the sandstones, particularly in red-coloured sandstones, due to the dissolution of carbonate cement. Minor secondary porosity was also created by the leaching of feldspar grains. Virtually all the observed porosity in the Carboniferous sandstones has a secondary origin. Subsequently, the precipitation of kaolinite reduced the porosity. The red-coloured sandstones are important in showing the depth of invasion of oxidising meteoric fluids following late Carboniferous-Permian uplift. The red colour is due to iron oxides liberated during the dedolomitization of a ferroan dolomite cement. Several instances of reddened Carboniferous strata across the UK probably have a similar origin and are potential oil and gas reservoirs as reddened sandstones may have a high secondary porosity.





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